Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

27 files changed, 9963 insertions, 0 deletions

diff --git a/src/ui/tool/README b/src/ui/tool/README
new file mode 100644
index 0000000..8a1c41a
--- /dev/null
+++ b/src/ui/tool/README
@@ -0,0 +1,29 @@
+
+
+This directory contains code related to on-screen editing (nodes, handles, etc.).
+
+Note that there are classes with similar functionality based on the SPKnot class in src/ui/knot.
+
+Classes here:
+
+  * ControlPoint
+  ** CurveDragPoint
+  ** Handle
+  ** RotationHandle
+  ** SelectableContrlPoint
+  *** Node
+  ** SelectorPoint,
+  ** TransformHandle
+  *** RotateHandle
+  *** ScaleHandle
+  **** ScaleCornerHandle
+  **** ScaleSideHandle
+  *** SkewHandle
+
+  * Manipulator
+  ** PointManipulator
+  *** MultiManipulator
+  *** PathManipulator
+  *** MultiPathManipulator
+  ** Selector
+  ** TransformHandleSet
diff --git a/src/ui/tool/commit-events.h b/src/ui/tool/commit-events.h
new file mode 100644
index 0000000..37fb861
--- /dev/null
+++ b/src/ui/tool/commit-events.h
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Commit events.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_COMMIT_EVENTS_H
+#define SEEN_UI_TOOL_COMMIT_EVENTS_H
+
+namespace Inkscape {
+namespace UI {
+
+/// This is used to provide sensible messages on the undo stack.
+enum CommitEvent {
+    COMMIT_MOUSE_MOVE,
+    COMMIT_KEYBOARD_MOVE_X,
+    COMMIT_KEYBOARD_MOVE_Y,
+    COMMIT_MOUSE_SCALE,
+    COMMIT_MOUSE_SCALE_UNIFORM,
+    COMMIT_KEYBOARD_SCALE_UNIFORM,
+    COMMIT_KEYBOARD_SCALE_X,
+    COMMIT_KEYBOARD_SCALE_Y,
+    COMMIT_MOUSE_ROTATE,
+    COMMIT_KEYBOARD_ROTATE,
+    COMMIT_MOUSE_SKEW_X,
+    COMMIT_MOUSE_SKEW_Y,
+    COMMIT_KEYBOARD_SKEW_X,
+    COMMIT_KEYBOARD_SKEW_Y,
+    COMMIT_FLIP_X,
+    COMMIT_FLIP_Y
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/control-point-selection.cpp b/src/ui/tool/control-point-selection.cpp
new file mode 100644
index 0000000..3f910de
--- /dev/null
+++ b/src/ui/tool/control-point-selection.cpp
@@ -0,0 +1,784 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Node selection - implementation.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <boost/none.hpp>
+#include "ui/tool/selectable-control-point.h"
+#include <2geom/transforms.h>
+#include "desktop.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/transform-handle-set.h"
+#include "ui/tool/node.h"
+#include "display/control/snap-indicator.h"
+#include "ui/widget/canvas.h"
+
+
+
+#include <gdk/gdkkeysyms.h>
+
+namespace Inkscape {
+namespace UI {
+
+/**
+ * @class ControlPointSelection
+ * Group of selected control points.
+ *
+ * Some operations can be performed on all selected points regardless of their type, therefore
+ * this class is also a Manipulator. It handles the transformations of points using
+ * the keyboard.
+ *
+ * The exposed interface is similar to that of an STL set. Internally, a hash map is used.
+ * @todo Correct iterators (that don't expose the connection list)
+ */
+
+/** @var ControlPointSelection::signal_update
+ * Fires when the display needs to be updated to reflect changes.
+ */
+/** @var ControlPointSelection::signal_point_changed
+ * Fires when a control point is added to or removed from the selection.
+ * The first param contains a pointer to the control point that changed sel. state. 
+ * The second says whether the point is currently selected.
+ */
+/** @var ControlPointSelection::signal_commit
+ * Fires when a change that needs to be committed to XML happens.
+ */
+
+ControlPointSelection::ControlPointSelection(SPDesktop *d, Inkscape::CanvasItemGroup *th_group)
+    : Manipulator(d)
+    , _handles(new TransformHandleSet(d, th_group))
+    , _dragging(false)
+    , _handles_visible(true)
+    , _one_node_handles(false)
+{
+    signal_update.connect( sigc::bind(
+        sigc::mem_fun(*this, &ControlPointSelection::_updateTransformHandles),
+        true));
+    ControlPoint::signal_mouseover_change.connect(
+        sigc::hide(
+            sigc::mem_fun(*this, &ControlPointSelection::_mouseoverChanged)));
+    _handles->signal_transform.connect(
+        sigc::mem_fun(*this, &ControlPointSelection::transform));
+    _handles->signal_commit.connect(
+        sigc::mem_fun(*this, &ControlPointSelection::_commitHandlesTransform));
+}
+
+ControlPointSelection::~ControlPointSelection()
+{
+    clear();
+    delete _handles;
+}
+
+/** Add a control point to the selection. */
+std::pair<ControlPointSelection::iterator, bool> ControlPointSelection::insert(const value_type &x, bool notify, bool to_update)
+{
+    iterator found = _points.find(x);
+    if (found != _points.end()) {
+        return std::pair<iterator, bool>(found, false);
+    }
+
+    found = _points.insert(x).first;
+    _points_list.push_back(x);
+
+    x->updateState();
+
+    if (to_update) {
+        _update();
+    }
+    if (notify) {
+        signal_selection_changed.emit(std::vector<key_type>(1, x), true);
+    }
+
+    return std::pair<iterator, bool>(found, true);
+}
+
+/** Remove a point from the selection. */
+void ControlPointSelection::erase(iterator pos, bool to_update)
+{
+    SelectableControlPoint *erased = *pos;
+    _points_list.remove(*pos);
+    _points.erase(pos);
+    erased->updateState();
+    if (to_update) {
+        _update();
+    }
+}
+ControlPointSelection::size_type ControlPointSelection::erase(const key_type &k, bool notify)
+{
+    iterator pos = _points.find(k);
+    if (pos == _points.end()) return 0;
+    erase(pos);
+
+    if (notify) {
+        signal_selection_changed.emit(std::vector<key_type>(1, k), false);
+    }
+    return 1;
+}
+void ControlPointSelection::erase(iterator first, iterator last)
+{
+    std::vector<SelectableControlPoint *> out(first, last);
+    while (first != last) {
+        erase(first++, false);
+    }
+    _update();
+    signal_selection_changed.emit(out, false);
+}
+
+/** Remove all points from the selection, making it empty. */
+void ControlPointSelection::clear()
+{
+    if (empty()) {
+        return;
+    }
+
+    std::vector<SelectableControlPoint *> out(begin(), end()); // begin() takes from _points
+    _points.clear();
+    _points_list.clear();
+    for (auto erased : out) {
+        erased->updateState();
+    }
+
+    _update();
+    signal_selection_changed.emit(out, false);
+}
+
+/** Select all points that this selection can contain. */
+void ControlPointSelection::selectAll()
+{
+    for (auto _all_point : _all_points) {
+        insert(_all_point, false, false);
+    }
+    std::vector<SelectableControlPoint *> out(_all_points.begin(), _all_points.end());
+    if (!out.empty()) {
+        _update();
+        signal_selection_changed.emit(out, true);
+    }
+}
+/** Select all points inside the given rectangle (in desktop coordinates). */
+void ControlPointSelection::selectArea(Geom::Rect const &r, bool invert)
+{
+    std::vector<SelectableControlPoint *> out;
+    for (auto _all_point : _all_points) {
+        if (r.contains(*_all_point)) {
+            if (invert) {
+                erase(_all_point);
+            } else {
+                insert(_all_point, false, false);
+            }
+            out.push_back(_all_point);
+        }
+    }
+    if (!out.empty()) {
+        _update();
+        signal_selection_changed.emit(out, true);
+    }
+}
+/** Unselect all selected points and select all unselected points. */
+void ControlPointSelection::invertSelection()
+{
+    std::vector<SelectableControlPoint *> in, out;
+    for (auto _all_point : _all_points) {
+        if (_all_point->selected()) {
+            in.push_back(_all_point);
+            erase(_all_point); 
+        }
+        else {
+            out.push_back(_all_point);
+            insert(_all_point, false, false); 
+        }
+    }
+    _update();
+    if (!in.empty())
+        signal_selection_changed.emit(in, false);
+    if (!out.empty())
+        signal_selection_changed.emit(out, true);
+}
+void ControlPointSelection::spatialGrow(SelectableControlPoint *origin, int dir)
+{
+    bool grow = (dir > 0);
+    Geom::Point p = origin->position();
+    double best_dist = grow ? HUGE_VAL : 0;
+    SelectableControlPoint *match = nullptr;
+    for (auto _all_point : _all_points) {
+        bool selected = _all_point->selected();
+        if (grow && !selected) {
+            double dist = Geom::distance(_all_point->position(), p);
+            if (dist < best_dist) {
+                best_dist = dist;
+                match = _all_point;
+            }
+        }
+        if (!grow && selected) {
+            double dist = Geom::distance(_all_point->position(), p);
+            // use >= to also deselect the origin node when it's the last one selected
+            if (dist >= best_dist) {
+                best_dist = dist;
+                match = _all_point;
+            }
+        }
+    }
+    if (match) {
+        if (grow) insert(match);
+        else erase(match);
+        signal_selection_changed.emit(std::vector<value_type>(1, match), grow);
+    }
+}
+
+/** Transform all selected control points by the given affine transformation. */
+void ControlPointSelection::transform(Geom::Affine const &m)
+{
+    for (auto cur : _points) {
+        cur->transform(m);
+    }
+    for (auto cur : _points) {
+        cur->fixNeighbors();
+    }
+
+    _updateBounds();
+    // TODO preserving the rotation radius needs some rethinking...
+    if (_rot_radius) (*_rot_radius) *= m.descrim();
+    if (_mouseover_rot_radius) (*_mouseover_rot_radius) *= m.descrim();
+    signal_update.emit();
+}
+
+/** Align control points on the specified axis. */
+void ControlPointSelection::align(Geom::Dim2 axis, AlignTargetNode target)
+{
+    if (empty()) return;
+    Geom::Dim2 d = static_cast<Geom::Dim2>((axis + 1) % 2);
+
+    Geom::OptInterval bound;
+    for (auto _point : _points) {
+        bound.unionWith(Geom::OptInterval(_point->position()[d]));
+    }
+
+    if (!bound) { return; }
+
+    double new_coord;
+    switch (target) {
+        case AlignTargetNode::FIRST_NODE:
+            new_coord=(_points_list.front())->position()[d];
+            break;
+        case AlignTargetNode::LAST_NODE:
+            new_coord=(_points_list.back())->position()[d];
+            break;
+        case AlignTargetNode::MID_NODE:
+            new_coord=bound->middle();
+            break;
+        case AlignTargetNode::MIN_NODE:
+            new_coord=bound->min();
+            break;
+        case AlignTargetNode::MAX_NODE:
+            new_coord=bound->max();
+            break;
+        default:
+            return;
+    }
+
+    for (auto _point : _points) {
+        Geom::Point pos = _point->position();
+        pos[d] = new_coord;
+        _point->move(pos);
+    }
+}
+
+/** Equdistantly distribute control points by moving them in the specified dimension. */
+void ControlPointSelection::distribute(Geom::Dim2 d)
+{
+    if (empty()) return;
+
+    // this needs to be a multimap, otherwise it will fail when some points have the same coord
+    typedef std::multimap<double, SelectableControlPoint*> SortMap;
+
+    SortMap sm;
+    Geom::OptInterval bound;
+    // first we insert all points into a multimap keyed by the aligned coord to sort them
+    // simultaneously we compute the extent of selection
+    for (auto _point : _points) {
+        Geom::Point pos = _point->position();
+        sm.insert(std::make_pair(pos[d], _point));
+        bound.unionWith(Geom::OptInterval(pos[d]));
+    }
+
+    if (!bound) { return; }
+
+    // now we iterate over the multimap and set aligned positions.
+    double step = size() == 1 ? 0 : bound->extent() / (size() - 1);
+    double start = bound->min();
+    unsigned num = 0;
+    for (SortMap::iterator i = sm.begin(); i != sm.end(); ++i, ++num) {
+        Geom::Point pos = i->second->position();
+        pos[d] = start + num * step;
+        i->second->move(pos);
+    }
+}
+
+/** Get the bounds of the selection.
+ * @return Smallest rectangle containing the positions of all selected points,
+ *         or nothing if the selection is empty */
+Geom::OptRect ControlPointSelection::pointwiseBounds()
+{
+    return _bounds;
+}
+
+Geom::OptRect ControlPointSelection::bounds()
+{
+    return size() == 1 ? (*_points.begin())->bounds() : _bounds;
+}
+
+void ControlPointSelection::showTransformHandles(bool v, bool one_node)
+{
+    _one_node_handles = one_node;
+    _handles_visible = v;
+    _updateTransformHandles(false);
+}
+
+void ControlPointSelection::hideTransformHandles()
+{
+    _handles->setVisible(false);
+}
+void ControlPointSelection::restoreTransformHandles()
+{
+    _updateTransformHandles(true);
+}
+
+void ControlPointSelection::toggleTransformHandlesMode()
+{
+    if (_handles->mode() == TransformHandleSet::MODE_SCALE) {
+        _handles->setMode(TransformHandleSet::MODE_ROTATE_SKEW);
+        if (size() == 1) {
+            _handles->rotationCenter().setVisible(false);
+        }
+    } else {
+        _handles->setMode(TransformHandleSet::MODE_SCALE);
+    }
+}
+
+void ControlPointSelection::_pointGrabbed(SelectableControlPoint *point)
+{
+    hideTransformHandles();
+    _dragging = true;
+    _grabbed_point = point;
+    _farthest_point = point;
+    double maxdist = 0;
+    Geom::Affine m;
+    m.setIdentity();
+    for (auto _point : _points) {
+        _original_positions.insert(std::make_pair(_point, _point->position()));
+        _last_trans.insert(std::make_pair(_point, m));
+        double dist = Geom::distance(*_grabbed_point, *_point);
+        if (dist > maxdist) {
+            maxdist = dist;
+            _farthest_point = _point;
+        }
+    }
+}
+
+void ControlPointSelection::_pointDragged(Geom::Point &new_pos, GdkEventMotion *event)
+{
+    Geom::Point abs_delta = new_pos - _original_positions[_grabbed_point];
+    double fdist = Geom::distance(_original_positions[_grabbed_point], _original_positions[_farthest_point]);
+    if (held_only_alt(*event) && fdist > 0) {
+        // Sculpting
+        for (auto cur : _points) {
+            Geom::Affine trans;
+            trans.setIdentity();
+            double dist = Geom::distance(_original_positions[cur], _original_positions[_grabbed_point]);
+            double deltafrac = 0.5 + 0.5 * cos(M_PI * dist/fdist);
+            if (dist != 0.0) {
+                // The sculpting transformation is not affine, but it can be
+                // locally approximated by one. Here we compute the local
+                // affine approximation of the sculpting transformation near
+                // the currently transformed point. We then transform the point
+                // by this approximation. This gives us sensible behavior for node handles.
+                // NOTE: probably it would be better to transform the node handles,
+                // but ControlPointSelection is supposed to work for any
+                // SelectableControlPoints, not only Nodes. We could create a specialized
+                // NodeSelection class that inherits from this one and move sculpting there.
+                Geom::Point origdx(Geom::EPSILON, 0);
+                Geom::Point origdy(0, Geom::EPSILON);
+                Geom::Point origp = _original_positions[cur];
+                Geom::Point origpx = _original_positions[cur] + origdx;
+                Geom::Point origpy = _original_positions[cur] + origdy;
+                double distdx = Geom::distance(origpx, _original_positions[_grabbed_point]);
+                double distdy = Geom::distance(origpy, _original_positions[_grabbed_point]);
+                double deltafracdx = 0.5 + 0.5 * cos(M_PI * distdx/fdist);
+                double deltafracdy = 0.5 + 0.5 * cos(M_PI * distdy/fdist);
+                Geom::Point newp = origp + abs_delta * deltafrac;
+                Geom::Point newpx = origpx + abs_delta * deltafracdx;
+                Geom::Point newpy = origpy + abs_delta * deltafracdy;
+                Geom::Point newdx = (newpx - newp) / Geom::EPSILON;
+                Geom::Point newdy = (newpy - newp) / Geom::EPSILON;
+
+                Geom::Affine itrans(newdx[Geom::X], newdx[Geom::Y], newdy[Geom::X], newdy[Geom::Y], 0, 0);
+                if (itrans.isSingular())
+                    itrans.setIdentity();
+
+                trans *= Geom::Translate(-cur->position());
+                trans *= _last_trans[cur].inverse();
+                trans *= itrans;
+                trans *= Geom::Translate(_original_positions[cur] + abs_delta * deltafrac);
+                _last_trans[cur] = itrans;
+            } else {
+                trans *= Geom::Translate(-cur->position() + _original_positions[cur] + abs_delta * deltafrac);
+            }
+            cur->transform(trans);
+            //cur->move(_original_positions[cur] + abs_delta * deltafrac);
+        }
+    } else {
+        Geom::Point delta = new_pos - _grabbed_point->position();
+        for (auto cur : _points) {
+            cur->move(_original_positions[cur] + abs_delta);
+        }
+        _handles->rotationCenter().move(_handles->rotationCenter().position() + delta);
+    }
+    for (auto cur : _points) {
+        cur->fixNeighbors();
+    }
+    signal_update.emit();
+}
+
+void ControlPointSelection::_pointUngrabbed()
+{
+    _desktop->snapindicator->remove_snaptarget();
+    _original_positions.clear();
+    _last_trans.clear();
+    _dragging = false;
+    _grabbed_point = _farthest_point = nullptr;
+    _updateBounds();
+    restoreTransformHandles();
+    signal_commit.emit(COMMIT_MOUSE_MOVE);
+}
+
+bool ControlPointSelection::_pointClicked(SelectableControlPoint *p, GdkEventButton *event)
+{
+    // clicking a selected node should toggle the transform handles between rotate and scale mode,
+    // if they are visible
+    if (held_no_modifiers(*event) && _handles_visible && p->selected()) {
+        toggleTransformHandlesMode();
+        return true;
+    }
+    return false;
+}
+
+void ControlPointSelection::_mouseoverChanged()
+{
+    _mouseover_rot_radius = std::nullopt;
+}
+
+void ControlPointSelection::_update()
+{
+    _updateBounds();
+    _updateTransformHandles(false);
+    if (_bounds) {
+        _handles->rotationCenter().move(_bounds->midpoint());
+    }
+}
+
+void ControlPointSelection::_updateBounds()
+{
+    _rot_radius = std::nullopt;
+    _bounds = Geom::OptRect();
+    for (auto cur : _points) {
+        Geom::Point p = cur->position();
+        if (!_bounds) {
+            _bounds = Geom::Rect(p, p);
+        } else {
+            _bounds->expandTo(p);
+        }
+    }
+}
+
+void ControlPointSelection::_updateTransformHandles(bool preserve_center)
+{
+    if (_dragging) return;
+
+    if (_handles_visible && size() > 1) {
+        _handles->setBounds(*bounds(), preserve_center);
+        _handles->setVisible(true);
+    } else if (_one_node_handles && size() == 1) { // only one control point in selection
+        SelectableControlPoint *p = *begin();
+        _handles->setBounds(p->bounds());
+        _handles->rotationCenter().move(p->position());
+        _handles->rotationCenter().setVisible(false);
+        _handles->setVisible(true);
+    } else {
+        _handles->setVisible(false);
+    }
+}
+
+/** Moves the selected points along the supplied unit vector according to
+ * the modifier state of the supplied event. */
+bool ControlPointSelection::_keyboardMove(GdkEventKey const &event, Geom::Point const &dir)
+{
+    if (held_control(event)) return false;
+    unsigned num = 1 + _desktop->canvas->gobble_key_events(shortcut_key(event), 0);
+
+    Geom::Point delta = dir * num; 
+    if (held_shift(event)) delta *= 10;
+    if (held_alt(event)) {
+        delta /= _desktop->current_zoom();
+    } else {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        double nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000, "px");
+        delta *= nudge;
+    }
+
+    transform(Geom::Translate(delta));
+    if (fabs(dir[Geom::X]) > 0) {
+        signal_commit.emit(COMMIT_KEYBOARD_MOVE_X);
+    } else {
+        signal_commit.emit(COMMIT_KEYBOARD_MOVE_Y);
+    }
+    return true;
+}
+
+/**
+ * Computes the distance to the farthest corner of the bounding box.
+ * Used to determine what it means to "rotate by one pixel".
+ */
+double ControlPointSelection::_rotationRadius(Geom::Point const &rc)
+{
+    if (empty()) return 1.0; // some safe value
+    Geom::Rect b = *bounds();
+    double maxlen = 0;
+    for (unsigned i = 0; i < 4; ++i) {
+        double len = Geom::distance(b.corner(i), rc);
+        if (len > maxlen) maxlen = len;
+    }
+    return maxlen;
+}
+
+/**
+ * Rotates the selected points in the given direction according to the modifier state
+ * from the supplied event.
+ * @param event Key event to take modifier state from
+ * @param dir   Direction of rotation (math convention: 1 = counterclockwise, -1 = clockwise)
+ */
+bool ControlPointSelection::_keyboardRotate(GdkEventKey const &event, int dir)
+{
+    if (empty()) return false;
+
+    Geom::Point rc;
+
+    // rotate around the mouseovered point, or the selection's rotation center
+    // if nothing is mouseovered
+    double radius;
+    SelectableControlPoint *scp =
+        dynamic_cast<SelectableControlPoint*>(ControlPoint::mouseovered_point);
+    if (scp) {
+        rc = scp->position();
+        if (!_mouseover_rot_radius) {
+            _mouseover_rot_radius = _rotationRadius(rc);
+        }
+        radius = *_mouseover_rot_radius;
+    } else {
+        rc = _handles->rotationCenter();
+        if (!_rot_radius) {
+            _rot_radius = _rotationRadius(rc);
+        }
+        radius = *_rot_radius;
+    }
+
+    double angle;
+    if (held_alt(event)) {
+        // Rotate by "one pixel". We interpret this as rotating by an angle that causes
+        // the topmost point of a circle circumscribed about the selection's bounding box
+        // to move on an arc 1 screen pixel long.
+        angle = atan2(1.0 / _desktop->current_zoom(), radius) * dir;
+    } else {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        int snaps = prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+        angle = M_PI * dir / snaps;
+    }
+
+    // translate to origin, rotate, translate back to original position
+    Geom::Affine m = Geom::Translate(-rc)
+        * Geom::Rotate(angle) * Geom::Translate(rc);
+    transform(m);
+    signal_commit.emit(COMMIT_KEYBOARD_ROTATE);
+    return true;
+}
+
+
+bool ControlPointSelection::_keyboardScale(GdkEventKey const &event, int dir)
+{
+    if (empty()) return false;
+
+    double maxext = bounds()->maxExtent();
+    if (Geom::are_near(maxext, 0)) return false;
+
+    Geom::Point center;
+    SelectableControlPoint *scp =
+        dynamic_cast<SelectableControlPoint*>(ControlPoint::mouseovered_point);
+    if (scp) {
+        center = scp->position();
+    } else {
+        center = _handles->rotationCenter().position();
+    }
+
+    double length_change;
+    if (held_alt(event)) {
+        // Scale by "one pixel". It means shrink/grow 1px for the larger dimension
+        // of the bounding box.
+        length_change = 1.0 / _desktop->current_zoom() * dir;
+    } else {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        length_change = prefs->getDoubleLimited("/options/defaultscale/value", 2, 1, 1000, "px");
+        length_change *= dir;
+    }
+    double scale = (maxext + length_change) / maxext;
+    
+    Geom::Affine m = Geom::Translate(-center) * Geom::Scale(scale) * Geom::Translate(center);
+    transform(m);
+    signal_commit.emit(COMMIT_KEYBOARD_SCALE_UNIFORM);
+    return true;
+}
+
+bool ControlPointSelection::_keyboardFlip(Geom::Dim2 d)
+{
+    if (empty()) return false;
+
+    Geom::Scale scale_transform(1, 1);
+    if (d == Geom::X) {
+        scale_transform = Geom::Scale(-1, 1);
+    } else {
+        scale_transform = Geom::Scale(1, -1);
+    }
+
+    SelectableControlPoint *scp =
+        dynamic_cast<SelectableControlPoint*>(ControlPoint::mouseovered_point);
+    Geom::Point center = scp ? scp->position() : _handles->rotationCenter().position();
+
+    Geom::Affine m = Geom::Translate(-center) * scale_transform * Geom::Translate(center);
+    transform(m);
+    signal_commit.emit(d == Geom::X ? COMMIT_FLIP_X : COMMIT_FLIP_Y);
+    return true;
+}
+
+void ControlPointSelection::_commitHandlesTransform(CommitEvent ce)
+{
+    _updateBounds();
+    _updateTransformHandles(true);
+    signal_commit.emit(ce);
+}
+
+bool ControlPointSelection::event(Inkscape::UI::Tools::ToolBase * /*event_context*/, GdkEvent *event)
+{
+    // implement generic event handling that should apply for all control point selections here;
+    // for example, keyboard moves and transformations. This way this functionality doesn't need
+    // to be duplicated in many places
+    // Later split out so that it can be reused in object selection
+
+    switch (event->type) {
+    case GDK_KEY_PRESS:
+        // do not handle key events if the selection is empty
+        if (empty()) break;
+
+        switch(shortcut_key(event->key)) {
+        // moves
+        case GDK_KEY_Up:
+        case GDK_KEY_KP_Up:
+        case GDK_KEY_KP_8:
+            return _keyboardMove(event->key, Geom::Point(0, -_desktop->yaxisdir()));
+        case GDK_KEY_Down:
+        case GDK_KEY_KP_Down:
+        case GDK_KEY_KP_2:
+            return _keyboardMove(event->key, Geom::Point(0, _desktop->yaxisdir()));
+        case GDK_KEY_Right:
+        case GDK_KEY_KP_Right:
+        case GDK_KEY_KP_6:
+            return _keyboardMove(event->key, Geom::Point(1, 0));
+        case GDK_KEY_Left:
+        case GDK_KEY_KP_Left:
+        case GDK_KEY_KP_4:
+            return _keyboardMove(event->key, Geom::Point(-1, 0));
+
+        // rotates
+        case GDK_KEY_bracketleft:
+            return _keyboardRotate(event->key, -_desktop->yaxisdir());
+        case GDK_KEY_bracketright:
+            return _keyboardRotate(event->key, _desktop->yaxisdir());
+
+        // scaling
+        case GDK_KEY_less:
+        case GDK_KEY_comma:
+            return _keyboardScale(event->key, -1);
+        case GDK_KEY_greater:
+        case GDK_KEY_period:
+            return _keyboardScale(event->key, 1);
+
+        // TODO: skewing
+
+        // flipping
+        // NOTE: H is horizontal flip, while Shift+H switches transform handle mode!
+        case GDK_KEY_h:
+        case GDK_KEY_H:
+            if (held_shift(event->key)) {
+                toggleTransformHandlesMode();
+                return true;
+            }
+            // any modifiers except shift should cause no action
+            if (held_any_modifiers(event->key)) break;
+            return _keyboardFlip(Geom::X);
+        case GDK_KEY_v:
+        case GDK_KEY_V:
+            if (held_any_modifiers(event->key)) break;
+            return _keyboardFlip(Geom::Y);
+        default: break;
+        }
+        break;
+    default: break;
+    }
+    return false;
+}
+
+void ControlPointSelection::getOriginalPoints(std::vector<Inkscape::SnapCandidatePoint> &pts)
+{
+    pts.clear();
+    for (auto _point : _points) {
+        pts.emplace_back(_original_positions[_point], SNAPSOURCE_NODE_HANDLE);
+    }
+}
+
+void ControlPointSelection::getUnselectedPoints(std::vector<Inkscape::SnapCandidatePoint> &pts)
+{
+    pts.clear();
+    ControlPointSelection::Set &nodes = this->allPoints();
+    for (auto node : nodes) {
+        if (!node->selected()) {
+            Node *n = static_cast<Node*>(node);
+            pts.push_back(n->snapCandidatePoint());
+        }
+    }
+}
+
+void ControlPointSelection::setOriginalPoints()
+{
+    _original_positions.clear();
+    for (auto _point : _points) {
+        _original_positions.insert(std::make_pair(_point, _point->position()));
+    }
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/control-point-selection.h b/src/ui/tool/control-point-selection.h
new file mode 100644
index 0000000..dc58211
--- /dev/null
+++ b/src/ui/tool/control-point-selection.h
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Control point selection - stores a set of control points and applies transformations
+ * to them
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_CONTROL_POINT_SELECTION_H
+#define SEEN_UI_TOOL_CONTROL_POINT_SELECTION_H
+
+#include <list>
+#include <memory>
+#include <unordered_map>
+#include <unordered_set>
+#include <optional>
+#include <cstddef>
+#include <sigc++/sigc++.h>
+#include <2geom/forward.h>
+#include <2geom/point.h>
+#include <2geom/rect.h>
+#include "ui/tool/commit-events.h"
+#include "ui/tool/manipulator.h"
+#include "ui/tool/node-types.h"
+#include "snap-candidate.h"
+
+class SPDesktop;
+
+namespace Inkscape {
+class CanvasItemGroup;
+namespace UI {
+class TransformHandleSet;
+class SelectableControlPoint;
+}
+}
+
+namespace Inkscape {
+namespace UI {
+
+class ControlPointSelection : public Manipulator, public sigc::trackable {
+public:
+    ControlPointSelection(SPDesktop *d, Inkscape::CanvasItemGroup *th_group);
+    ~ControlPointSelection() override;
+    typedef std::unordered_set<SelectableControlPoint *> set_type;
+    typedef set_type Set; // convenience alias
+
+    typedef set_type::iterator iterator;
+    typedef set_type::const_iterator const_iterator;
+    typedef set_type::size_type size_type;
+    typedef SelectableControlPoint *value_type;
+    typedef SelectableControlPoint *key_type;
+
+    // size
+    bool empty() { return _points.empty(); }
+    size_type size() { return _points.size(); }
+
+    // iterators
+    iterator begin() { return _points.begin(); }
+    const_iterator begin() const { return _points.begin(); }
+    iterator end() { return _points.end(); }
+    const_iterator end() const { return _points.end(); }
+
+    // insert
+    std::pair<iterator, bool> insert(const value_type& x, bool notify = true, bool to_update = true);
+    template <class InputIterator>
+    void insert(InputIterator first, InputIterator last) {
+        for (; first != last; ++first) {
+            insert(*first, false, false);
+        }
+        _update();
+        signal_selection_changed.emit(std::vector<key_type>(first, last), true);
+    }
+
+    // erase
+    void clear();
+    void erase(iterator pos, bool to_update = true);
+    size_type erase(const key_type& k, bool notify = true);
+    void erase(iterator first, iterator last);
+
+    // find
+    iterator find(const key_type &k) {
+        return _points.find(k);
+    }
+
+    // Sometimes it is very useful to keep a list of all selectable points.
+    set_type const &allPoints() const { return _all_points; }
+    set_type &allPoints() { return _all_points; }
+    // ...for example in these methods. Another useful case is snapping.
+    void selectAll();
+    void selectArea(Geom::Rect const &, bool invert = false);
+    void invertSelection();
+    void spatialGrow(SelectableControlPoint *origin, int dir);
+
+    bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *) override;
+
+    void transform(Geom::Affine const &m);
+    void align(Geom::Dim2 d, AlignTargetNode target = AlignTargetNode::MID_NODE);
+    void distribute(Geom::Dim2 d);
+
+    Geom::OptRect pointwiseBounds();
+    Geom::OptRect bounds();
+
+    bool transformHandlesEnabled() { return _handles_visible; }
+    void showTransformHandles(bool v, bool one_node);
+    // the two methods below do not modify the state; they are for use in manipulators
+    // that need to temporarily hide the handles, for example when moving a node
+    void hideTransformHandles();
+    void restoreTransformHandles();
+    void toggleTransformHandlesMode();
+
+    sigc::signal<void> signal_update;
+    // It turns out that emitting a signal after every point is selected or deselected is not too efficient,
+    // so this can be done in a massive group once the selection is finally changed.
+    sigc::signal<void, std::vector<SelectableControlPoint *>, bool> signal_selection_changed;
+    sigc::signal<void, CommitEvent> signal_commit;
+
+    void getOriginalPoints(std::vector<Inkscape::SnapCandidatePoint> &pts);
+    void getUnselectedPoints(std::vector<Inkscape::SnapCandidatePoint> &pts);
+    void setOriginalPoints();
+    //the purpose of this list is to keep track of first and last selected
+    std::list<SelectableControlPoint *> _points_list;
+
+private:
+    // The functions below are invoked from SelectableControlPoint.
+    // Previously they were connected to handlers when selecting, but this
+    // creates problems when dragging a point that was not selected.
+    void _pointGrabbed(SelectableControlPoint *);
+    void _pointDragged(Geom::Point &, GdkEventMotion *);
+    void _pointUngrabbed();
+    bool _pointClicked(SelectableControlPoint *, GdkEventButton *);
+    void _mouseoverChanged();
+
+    void _update();
+    void _updateTransformHandles(bool preserve_center);
+    void _updateBounds();
+    bool _keyboardMove(GdkEventKey const &, Geom::Point const &);
+    bool _keyboardRotate(GdkEventKey const &, int);
+    bool _keyboardScale(GdkEventKey const &, int);
+    bool _keyboardFlip(Geom::Dim2);
+    void _keyboardTransform(Geom::Affine const &);
+    void _commitHandlesTransform(CommitEvent ce);
+    double _rotationRadius(Geom::Point const &);
+
+    set_type _points;
+
+    set_type _all_points;
+    std::unordered_map<SelectableControlPoint *, Geom::Point> _original_positions;
+    std::unordered_map<SelectableControlPoint *, Geom::Affine> _last_trans;
+    std::optional<double> _rot_radius;
+    std::optional<double> _mouseover_rot_radius;
+    Geom::OptRect _bounds;
+    TransformHandleSet *_handles;
+    SelectableControlPoint *_grabbed_point, *_farthest_point;
+    unsigned _dragging         : 1;
+    unsigned _handles_visible  : 1;
+    unsigned _one_node_handles : 1;
+
+    friend class SelectableControlPoint;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
diff --git a/src/ui/tool/control-point.cpp b/src/ui/tool/control-point.cpp
new file mode 100644
index 0000000..da6bdaf
--- /dev/null
+++ b/src/ui/tool/control-point.cpp
@@ -0,0 +1,597 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <iostream>
+
+#include <gdk/gdkkeysyms.h>
+#include <gdkmm.h>
+
+#include <2geom/point.h>
+
+#include "desktop.h"
+#include "message-context.h"
+
+#include "display/control/canvas-item-enums.h"
+#include "display/control/snap-indicator.h"
+
+#include "object/sp-namedview.h"
+
+#include "ui/tools/tool-base.h"
+#include "ui/tool/control-point.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/transform-handle-set.h"
+
+#include "ui/widget/canvas.h" // Forced redraws
+
+namespace Inkscape {
+namespace UI {
+
+
+// Default colors for control points
+ControlPoint::ColorSet ControlPoint::_default_color_set = {
+    {0xffffff00, 0x01000000}, // normal fill, stroke
+    {0xff0000ff, 0x01000000}, // mouseover fill, stroke
+    {0x0000ffff, 0x01000000}, // clicked fill, stroke
+    //
+    {0x0000ffff, 0x000000ff}, // normal fill, stroke when selected
+    {0xff000000, 0x000000ff}, // mouseover fill, stroke when selected
+    {0xff000000, 0x000000ff}  // clicked fill, stroke when selected
+};
+
+ControlPoint *ControlPoint::mouseovered_point = nullptr;
+
+sigc::signal<void, ControlPoint*> ControlPoint::signal_mouseover_change;
+
+Geom::Point ControlPoint::_drag_event_origin(Geom::infinity(), Geom::infinity());
+
+Geom::Point ControlPoint::_drag_origin(Geom::infinity(), Geom::infinity());
+
+Gdk::EventMask const ControlPoint::_grab_event_mask = (Gdk::BUTTON_PRESS_MASK   |
+                                                       Gdk::BUTTON_RELEASE_MASK |
+                                                       Gdk::POINTER_MOTION_MASK |
+                                                       Gdk::KEY_PRESS_MASK      |
+                                                       Gdk::KEY_RELEASE_MASK    |
+                                                       Gdk::SCROLL_MASK         |
+                                                       Gdk::SMOOTH_SCROLL_MASK  );
+
+bool ControlPoint::_drag_initiated = false;
+bool ControlPoint::_event_grab = false;
+
+ControlPoint::ColorSet ControlPoint::invisible_cset = {
+    {0x00000000, 0x00000000},
+    {0x00000000, 0x00000000},
+    {0x00000000, 0x00000000},
+    {0x00000000, 0x00000000},
+    {0x00000000, 0x00000000},
+    {0x00000000, 0x00000000}
+};
+
+ControlPoint::ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                           Glib::RefPtr<Gdk::Pixbuf> pixbuf,
+                           ColorSet const &cset,
+                           Inkscape::CanvasItemGroup *group)
+    : _desktop(d)
+    , _cset(cset)
+    , _position(initial_pos)
+{
+    _canvas_item_ctrl = new Inkscape::CanvasItemCtrl(group ? group : _desktop->getCanvasControls(),
+                                                Inkscape::CANVAS_ITEM_CTRL_SHAPE_BITMAP);
+    _canvas_item_ctrl->set_name("CanvasItemCtrl:ControlPoint");
+    _canvas_item_ctrl->set_pixbuf(pixbuf->gobj());
+    _canvas_item_ctrl->set_fill(  _cset.normal.fill);
+    _canvas_item_ctrl->set_stroke(_cset.normal.stroke);
+    _canvas_item_ctrl->set_anchor(anchor);
+
+    _commonInit();
+}
+
+ControlPoint::ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                           Inkscape::CanvasItemCtrlType type,
+                           ColorSet const &cset,
+                           Inkscape::CanvasItemGroup *group)
+    : _desktop(d)
+    , _cset(cset)
+    , _position(initial_pos)
+{
+    _canvas_item_ctrl = new Inkscape::CanvasItemCtrl(group ? group : _desktop->getCanvasControls(), type);
+    _canvas_item_ctrl->set_name("CanvasItemCtrl:ControlPoint");
+    _canvas_item_ctrl->set_fill(  _cset.normal.fill);
+    _canvas_item_ctrl->set_stroke(_cset.normal.stroke);
+    _canvas_item_ctrl->set_anchor(anchor);
+
+    _commonInit();
+}
+
+ControlPoint::~ControlPoint()
+{
+    // avoid storing invalid points in mouseovered_point
+    if (this == mouseovered_point) {
+        _clearMouseover();
+    }
+
+    //g_signal_handler_disconnect(G_OBJECT(_canvas_item_ctrl), _event_handler_connection);
+    _event_handler_connection.disconnect();
+    _canvas_item_ctrl->hide();
+    delete _canvas_item_ctrl;
+}
+
+void ControlPoint::_commonInit()
+{
+    _canvas_item_ctrl->set_position(_position);
+    _event_handler_connection =
+        _canvas_item_ctrl->connect_event(sigc::bind(sigc::ptr_fun(_event_handler), this));
+    // _event_handler_connection = g_signal_connect(G_OBJECT(_canvas_item_ctrl), "event",
+    //                                              G_CALLBACK(_event_handler), this);
+}
+
+void ControlPoint::setPosition(Geom::Point const &pos)
+{
+    _position = pos;
+    _canvas_item_ctrl->set_position(_position);
+}
+
+void ControlPoint::move(Geom::Point const &pos)
+{
+    setPosition(pos);
+}
+
+void ControlPoint::transform(Geom::Affine const &m) {
+    move(position() * m);
+}
+
+bool ControlPoint::visible() const
+{
+    return _canvas_item_ctrl->is_visible();
+}
+
+void ControlPoint::setVisible(bool v)
+{
+    if (v) {
+        _canvas_item_ctrl->show();
+    } else {
+        _canvas_item_ctrl->hide();
+    }
+}
+
+Glib::ustring ControlPoint::format_tip(char const *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+    char *dyntip = g_strdup_vprintf(format, args);
+    va_end(args);
+    Glib::ustring ret = dyntip;
+    g_free(dyntip);
+    return ret;
+}
+
+
+// ===== Setters =====
+
+void ControlPoint::_setSize(unsigned int size)
+{
+    _canvas_item_ctrl->set_size(size);
+}
+
+void ControlPoint::_setControlType(Inkscape::CanvasItemCtrlType type)
+{
+    _canvas_item_ctrl->set_type(type);
+}
+
+void ControlPoint::_setAnchor(SPAnchorType anchor)
+{
+//     g_object_set(_canvas_item_ctrl, "anchor", anchor, nullptr);
+}
+
+void ControlPoint::_setPixbuf(Glib::RefPtr<Gdk::Pixbuf> p)
+{
+    _canvas_item_ctrl->set_pixbuf(Glib::unwrap(p));
+}
+
+// re-routes events into the virtual function   TODO: Refactor this nonsense.
+bool ControlPoint::_event_handler(GdkEvent *event, ControlPoint *point)
+{
+    if ((point == nullptr) || (point->_desktop == nullptr)) {
+        return false;
+    }
+    return point->_eventHandler(point->_desktop->event_context, event);
+}
+
+// main event callback, which emits all other callbacks.
+bool ControlPoint::_eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    // NOTE the static variables below are shared for all points!
+    // TODO handle clicks and drags from other buttons too
+
+    if (event == nullptr)
+    {
+        return false;
+    }
+    
+    if (event_context == nullptr)
+    {
+        return false;
+    }
+    if (_desktop == nullptr)
+    {
+        return false;
+    }
+    if(event_context->getDesktop() !=_desktop)
+    {
+        g_warning ("ControlPoint: desktop pointers not equal!");
+        //return false;
+    }
+    // offset from the pointer hotspot to the center of the grabbed knot in desktop coords
+    static Geom::Point pointer_offset;
+    // number of last doubleclicked button
+    static unsigned next_release_doubleclick = 0;
+    _double_clicked = false;
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int drag_tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+
+    switch(event->type)
+    {   
+    case GDK_BUTTON_PRESS:
+        next_release_doubleclick = 0;
+        if (event->button.button == 1 && !event_context->is_space_panning()) {
+            // 1st mouse button click. internally, start dragging, but do not emit signals
+            // or change position until drag tolerance is exceeded.
+            _drag_event_origin[Geom::X] = event->button.x;
+            _drag_event_origin[Geom::Y] = event->button.y;
+            pointer_offset = _position - _desktop->w2d(_drag_event_origin);
+            _drag_initiated = false;
+            // route all events to this handler
+            _canvas_item_ctrl->grab(_grab_event_mask, nullptr); // cursor is null
+            _event_grab = true;
+            _setState(STATE_CLICKED);
+            return true;
+        }
+        return _event_grab;
+
+    case GDK_2BUTTON_PRESS:
+        // store the button number for next release
+        next_release_doubleclick = event->button.button;
+        return true;
+        
+    case GDK_MOTION_NOTIFY:
+        if (_event_grab && ! event_context->is_space_panning()) {
+            _desktop->snapindicator->remove_snaptarget(); 
+            bool transferred = false;
+            if (!_drag_initiated) {
+                bool t = fabs(event->motion.x - _drag_event_origin[Geom::X]) <= drag_tolerance &&
+                         fabs(event->motion.y - _drag_event_origin[Geom::Y]) <= drag_tolerance;
+                if (t){
+                    return true;
+                }
+
+                // if we are here, it means the tolerance was just exceeded.
+                _drag_origin = _position;
+                transferred = grabbed(&event->motion);
+                // _drag_initiated might change during the above virtual call
+                _drag_initiated = true;
+            }
+
+            if (!transferred) {
+                // dragging in progress
+                Geom::Point new_pos = _desktop->w2d(event_point(event->motion)) + pointer_offset;
+                // the new position is passed by reference and can be changed in the handlers.
+                dragged(new_pos, &event->motion);
+                move(new_pos);
+                _updateDragTip(&event->motion); // update dragging tip after moving to new position
+
+                _desktop->scroll_to_point(new_pos);
+                _desktop->set_coordinate_status(_position);
+                sp_event_context_snap_delay_handler(event_context, nullptr,
+                    (gpointer) this, &event->motion,
+                    Inkscape::UI::Tools::DelayedSnapEvent::CONTROL_POINT_HANDLER);
+            }
+            return true;
+        }
+        break;
+        
+    case GDK_BUTTON_RELEASE:
+        if (_event_grab && event->button.button == 1) {
+            // If we have any pending snap event, then invoke it now!
+            // (This is needed because we might not have snapped on the latest GDK_MOTION_NOTIFY event
+            // if the mouse speed was too high. This is inherent to the snap-delay mechanism.
+            // We must snap at some point in time though, and this is our last chance)
+            // PS: For other contexts this is handled already in start_item_handler or start_root_handler
+            // if (_desktop && _desktop->event_context && _desktop->event_context->_delayed_snap_event) {
+            if (event_context->_delayed_snap_event) {
+                sp_event_context_snap_watchdog_callback(event_context->_delayed_snap_event);
+            }
+
+            _canvas_item_ctrl->ungrab();
+            _setMouseover(this, event->button.state);
+            _event_grab = false;
+
+            if (_drag_initiated) {
+                // it is the end of a drag
+                _drag_initiated = false;
+                ungrabbed(&event->button);
+                return true;
+            } else {
+                // it is the end of a click
+                if (next_release_doubleclick) {
+                    _double_clicked = true;
+                    return doubleclicked(&event->button);
+                } else {
+                    return clicked(&event->button);
+                }
+            }
+        }
+        break;
+
+    case GDK_ENTER_NOTIFY:
+        _setMouseover(this, event->crossing.state);
+        return true;
+    case GDK_LEAVE_NOTIFY:
+        _clearMouseover();
+        return true;
+
+    case GDK_GRAB_BROKEN:
+        if (_event_grab && !event->grab_broken.keyboard) {
+            {
+                ungrabbed(nullptr);
+            }
+            _setState(STATE_NORMAL);
+            _event_grab = false;
+            _drag_initiated = false;
+            return true;
+        }
+        break;
+
+    // update tips on modifier state change
+    // TODO add ESC keybinding as drag cancel
+    case GDK_KEY_PRESS:
+        switch (Inkscape::UI::Tools::get_latin_keyval(&event->key))
+        {
+        case GDK_KEY_Escape: {
+            // ignore Escape if this is not a drag
+            if (!_drag_initiated) break;
+
+            // temporarily disable snapping - we might snap to a different place than we were initially
+            event_context->discard_delayed_snap_event();
+            SnapPreferences &snapprefs = _desktop->namedview->snap_manager.snapprefs;
+            bool snap_save = snapprefs.getSnapEnabledGlobally();
+            snapprefs.setSnapEnabledGlobally(false);
+
+            Geom::Point new_pos = _drag_origin;
+
+            // make a fake event for dragging
+            // ASSUMPTION: dragging a point without modifiers will never prevent us from moving it
+            //             to its original position
+            GdkEventMotion fake;
+            fake.type = GDK_MOTION_NOTIFY;
+            fake.window = event->key.window;
+            fake.send_event = event->key.send_event;
+            fake.time = event->key.time;
+            fake.x = _drag_event_origin[Geom::X]; // these two are normally not used in handlers
+            fake.y = _drag_event_origin[Geom::Y]; // (and shouldn't be)
+            fake.axes = nullptr;
+            fake.state = 0; // unconstrained drag
+            fake.is_hint = FALSE;
+            fake.device = nullptr;
+            fake.x_root = -1; // not used in handlers (and shouldn't be)
+            fake.y_root = -1; // can be used as a flag to check for cancelled drag
+            
+            dragged(new_pos, &fake);
+
+            _canvas_item_ctrl->ungrab();
+            _clearMouseover(); // this will also reset state to normal
+            _event_grab = false;
+            _drag_initiated = false;
+
+            ungrabbed(nullptr); // ungrabbed handlers can handle a NULL event
+            snapprefs.setSnapEnabledGlobally(snap_save);
+            }
+            return true;
+        case GDK_KEY_Tab:
+            {// Downcast from ControlPoint to TransformHandle, if possible
+             // This is an ugly hack; we should have the transform handle intercept the keystrokes itself
+            TransformHandle *th = dynamic_cast<TransformHandle*>(this);
+            if (th) {
+                th->getNextClosestPoint(false);
+                return true;
+            }
+            break;
+            }
+        case GDK_KEY_ISO_Left_Tab:
+            {// Downcast from ControlPoint to TransformHandle, if possible
+             // This is an ugly hack; we should have the transform handle intercept the keystrokes itself
+            TransformHandle *th = dynamic_cast<TransformHandle*>(this);
+            if (th) {
+                th->getNextClosestPoint(true);
+                return true;
+            }
+            break;
+            }
+        default:
+            break;
+        }
+        // Do not break here, to allow for updating tooltips and such
+    case GDK_KEY_RELEASE: 
+        if (mouseovered_point != this){
+            return false;
+        }
+        if (_drag_initiated) {
+            return true; // this prevents the tool from overwriting the drag tip
+        } else {
+            unsigned state = state_after_event(event);
+            if (state != event->key.state) {
+                // we need to return true if there was a tip available, otherwise the tool's
+                // handler will process this event and set the tool's message, overwriting
+                // the point's message
+                return _updateTip(state);
+            }
+        }
+        break;
+
+    default: break;
+    }
+
+    // do not propagate events during grab - it might cause problems
+    return _event_grab;
+}
+
+void ControlPoint::_setMouseover(ControlPoint *p, unsigned state)
+{
+    bool visible = p->visible();
+    if (visible) { // invisible points shouldn't get mouseovered
+        p->_setState(STATE_MOUSEOVER);
+    }
+    p->_updateTip(state);
+
+    if (visible && mouseovered_point != p) {
+        mouseovered_point = p;
+        signal_mouseover_change.emit(mouseovered_point);
+    }
+}
+
+bool ControlPoint::_updateTip(unsigned state)
+{
+    Glib::ustring tip = _getTip(state);
+    if (!tip.empty()) {
+        _desktop->event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE,
+            tip.data());
+        return true;
+    } else {
+        _desktop->event_context->defaultMessageContext()->clear();
+        return false;
+    }
+}
+
+bool ControlPoint::_updateDragTip(GdkEventMotion *event)
+{
+    if (!_hasDragTips()) {
+        return false;
+    }
+    Glib::ustring tip = _getDragTip(event);
+    if (!tip.empty()) {
+        _desktop->event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE,
+            tip.data());
+        return true;
+    } else {
+        _desktop->event_context->defaultMessageContext()->clear();
+        return false;
+    }
+}
+
+void ControlPoint::_clearMouseover()
+{
+    if (mouseovered_point) {
+        mouseovered_point->_desktop->event_context->defaultMessageContext()->clear();
+        mouseovered_point->_setState(STATE_NORMAL);
+        mouseovered_point = nullptr;
+        signal_mouseover_change.emit(mouseovered_point);
+    }
+}
+
+void ControlPoint::transferGrab(ControlPoint *prev_point, GdkEventMotion *event)
+{
+    if (!_event_grab) return;
+
+    grabbed(event);
+    prev_point->_canvas_item_ctrl->ungrab();
+    _canvas_item_ctrl->grab(_grab_event_mask, nullptr); // cursor is null
+
+    _drag_initiated = true;
+
+    prev_point->_setState(STATE_NORMAL);
+    _setMouseover(this, event->state);
+}
+
+void ControlPoint::_setState(State state)
+{
+    ColorEntry current = {0, 0};
+    ColorSet const &activeCset = (_isLurking()) ? invisible_cset : _cset;
+    switch(state) {
+        case STATE_NORMAL:
+            current = activeCset.normal;
+            break;
+        case STATE_MOUSEOVER:
+            current = activeCset.mouseover;
+            break;
+        case STATE_CLICKED:
+            current = activeCset.clicked;
+            break;
+    };
+    _setColors(current);
+    _state = state;
+}
+
+// TODO: RENAME
+void ControlPoint::_handleControlStyling()
+{
+    _canvas_item_ctrl->set_size_default();
+}
+
+void ControlPoint::_setColors(ColorEntry colors)
+{
+    _canvas_item_ctrl->set_fill(colors.fill);
+    _canvas_item_ctrl->set_stroke(colors.stroke);
+}
+
+bool ControlPoint::_isLurking()
+{
+    return _lurking;
+}
+
+void ControlPoint::_setLurking(bool lurking)
+{
+    if (lurking != _lurking) {
+        _lurking = lurking;
+        _setState(_state); // TODO refactor out common part
+    }
+}
+
+
+bool ControlPoint::_is_drag_cancelled(GdkEventMotion *event)
+{
+    return !event || event->x_root == -1;
+}
+
+// dummy implementations for handlers
+
+bool ControlPoint::grabbed(GdkEventMotion * /*event*/)
+{
+    return false;
+}
+
+void ControlPoint::dragged(Geom::Point &/*new_pos*/, GdkEventMotion * /*event*/)
+{
+}
+
+void ControlPoint::ungrabbed(GdkEventButton * /*event*/)
+{
+}
+
+bool ControlPoint::clicked(GdkEventButton * /*event*/)
+{
+    return false;
+}
+
+bool ControlPoint::doubleclicked(GdkEventButton * /*event*/)
+{
+    return false;
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/control-point.h b/src/ui/tool/control-point.h
new file mode 100644
index 0000000..7cc3977
--- /dev/null
+++ b/src/ui/tool/control-point.h
@@ -0,0 +1,414 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2012 Authors
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_CONTROL_POINT_H
+#define SEEN_UI_TOOL_CONTROL_POINT_H
+
+#include <gdkmm/pixbuf.h>
+#include <boost/utility.hpp>
+#include <cstddef>
+#include <sigc++/signal.h>
+#include <sigc++/trackable.h>
+#include <2geom/point.h>
+
+// #include "ui/control-types.h"
+#include "display/control/canvas-item-ctrl.h"
+#include "display/control/canvas-item-enums.h"
+
+#include "enums.h" // TEMP TEMP
+
+class SPDesktop;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+class ToolBase;
+
+}
+}
+}
+
+namespace Inkscape {
+namespace UI {
+
+/**
+ * Draggable point, the workhorse of on-canvas editing.
+ *
+ * Control points (formerly known as knots) are graphical representations of some significant
+ * point in the drawing. The drawing can be changed by dragging the point and the things that are
+ * attached to it with the mouse. Example things that could be edited with draggable points
+ * are gradient stops, the place where text is attached to a path, text kerns, nodes and handles
+ * in a path, and many more.
+ *
+ * @par Control point event handlers
+ * @par
+ * The control point has several virtual methods which allow you to react to things that
+ * happen to it. The most important ones are the grabbed, dragged, ungrabbed and moved functions.
+ * When a drag happens, the order of calls is as follows:
+ * - <tt>grabbed()</tt>
+ * - <tt>dragged()</tt>
+ * - <tt>dragged()</tt>
+ * - <tt>dragged()</tt>
+ * - ...
+ * - <tt>dragged()</tt>
+ * - <tt>ungrabbed()</tt>
+ *
+ * The control point can also respond to clicks and double clicks. On a double click,
+ * clicked() is called, followed by doubleclicked(). When deriving from SelectableControlPoint,
+ * you need to manually call the superclass version at the appropriate point in your handler.
+ *
+ * @par Which method to override?
+ * @par
+ * You might wonder which hook to use when you want to do things when the point is relocated.
+ * Here are some tips:
+ * - If the point is used to edit an object, override the move() method.
+ * - If the point can usually be dragged wherever you like but can optionally be constrained
+ *   to axes or the like, add a handler for <tt>signal_dragged</tt> that modifies its new
+ *   position argument.
+ * - If the point has additional canvas items tied to it (like handle lines), override
+ *   the setPosition() method.
+ */
+class ControlPoint : boost::noncopyable, public sigc::trackable {
+public:
+
+    /**
+     * Enumeration representing the possible states of the control point, used to determine
+     * its appearance.
+     *
+     * @todo resolve this to be in sync with the five standard GTK states.
+     */
+    enum State {
+        /** Normal state. */
+        STATE_NORMAL,
+
+        /** Mouse is hovering over the control point. */
+        STATE_MOUSEOVER,
+
+        /** First mouse button pressed over the control point. */
+        STATE_CLICKED
+    };
+
+    /**
+     * Destructor
+     */
+    virtual ~ControlPoint();
+    
+    /// @name Adjust the position of the control point
+    /// @{
+    /** Current position of the control point. */
+    Geom::Point const &position() const { return _position; }
+
+    operator Geom::Point const &() { return _position; }
+
+    /**
+     * Move the control point to new position with side effects.
+     * This is called after each drag. Override this method if only some positions make sense
+     * for a control point (like a point that must always be on a path and can't modify it),
+     * or when moving a control point changes the positions of other points.
+     */
+    virtual void move(Geom::Point const &pos);
+
+    /**
+     * Relocate the control point without side effects.
+     * Overload this method only if there is an additional graphical representation
+     * that must be updated (like the lines that connect handles to nodes). If you override it,
+     * you must also call the superclass implementation of the method.
+     * @todo Investigate whether this method should be protected
+     */
+    virtual void setPosition(Geom::Point const &pos);
+
+    /**
+     * Apply an arbitrary affine transformation to a control point. This is used
+     * by ControlPointSelection, and is important for things like nodes with handles.
+     * The default implementation simply moves the point according to the transform.
+     */
+    virtual void transform(Geom::Affine const &m);
+
+    /**
+     * Apply any node repairs, by default no fixing is applied but Nodes will update
+     * smooth nodes to make sure nodes are kept consistent.
+     */
+    virtual void fixNeighbors() {};
+
+    /// @}
+    
+    /// @name Toggle the point's visibility
+    /// @{
+    bool visible() const;
+
+    /**
+     * Set the visibility of the control point. An invisible point is not drawn on the canvas
+     * and cannot receive any events. If you want to have an invisible point that can respond
+     * to events, use <tt>invisible_cset</tt> as its color set.
+     */
+    virtual void setVisible(bool v);
+    /// @}
+    
+    /// @name Transfer grab from another event handler
+    /// @{
+    /**
+     * Transfer the grab to another point. This method allows one to create a draggable point
+     * that should be dragged instead of the one that received the grabbed signal.
+     * This is used to implement dragging out handles in the new node tool, for example.
+     *
+     * This method will NOT emit the ungrab signal of @c prev_point, because this would complicate
+     * using it with selectable control points. If you use this method while dragging, you must emit
+     * the ungrab signal yourself.
+     *
+     * Note that this will break horribly if you try to transfer grab between points in different
+     * desktops, which doesn't make much sense anyway.
+     */
+    void transferGrab(ControlPoint *from, GdkEventMotion *event);
+    /// @}
+
+    /// @name Inspect the state of the control point
+    /// @{
+    State state() const { return _state; }
+
+    bool mouseovered() const { return this == mouseovered_point; }
+    /// @}
+
+    /** Holds the currently mouseovered control point. */
+    static ControlPoint *mouseovered_point;
+
+    /**
+     * Emitted when the mouseovered point changes. The parameter is the new mouseovered point.
+     * When a point ceases to be mouseovered, the parameter will be NULL.
+     */
+    static sigc::signal<void, ControlPoint*> signal_mouseover_change;
+
+    static Glib::ustring format_tip(char const *format, ...) G_GNUC_PRINTF(1,2);
+
+    // temporarily public, until snap delay is refactored a little
+    virtual bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event);
+    SPDesktop *const _desktop; ///< The desktop this control point resides on.
+
+    bool doubleClicked() {return _double_clicked;}
+
+protected:
+
+    struct ColorEntry {
+        guint32 fill;
+        guint32 stroke;
+    };
+
+    /**
+     * Color entries for each possible state.
+     * @todo resolve this to be in sync with the five standard GTK states.
+     */
+    struct ColorSet {
+        ColorEntry normal;
+        ColorEntry mouseover;
+        ColorEntry clicked;
+        ColorEntry selected_normal;
+        ColorEntry selected_mouseover;
+        ColorEntry selected_clicked;
+    };
+
+    /**
+     * A color set which you can use to create an invisible control that can still receive events.
+     */
+    static ColorSet invisible_cset;
+
+    /**
+     * Create a regular control point.
+     * Derive to have constructors with a reasonable number of parameters.
+     *
+     * @param d Desktop for this control
+     * @param initial_pos Initial position of the control point in desktop coordinates
+     * @param anchor Where is the control point rendered relative to its desktop coordinates
+     * @param type Logical type of the control point.
+     * @param cset Colors of the point
+     * @param group The canvas group the point's canvas item should be created in
+     */
+    ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                 Inkscape::CanvasItemCtrlType type,
+                 ColorSet const &cset = _default_color_set,
+                 Inkscape::CanvasItemGroup *group = nullptr);
+
+    /**
+     * Create a control point with a pixbuf-based visual representation.
+     *
+     * @param d Desktop for this control
+     * @param initial_pos Initial position of the control point in desktop coordinates
+     * @param anchor Where is the control point rendered relative to its desktop coordinates
+     * @param pixbuf Pixbuf to be used as the visual representation
+     * @param cset Colors of the point
+     * @param group The canvas group the point's canvas item should be created in
+     */
+    ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                 Glib::RefPtr<Gdk::Pixbuf> pixbuf,
+                 ColorSet const &cset = _default_color_set,
+                 Inkscape::CanvasItemGroup *group = nullptr);
+
+    /// @name Handle control point events in subclasses
+    /// @{
+    /**
+     * Called when the user moves the point beyond the drag tolerance with the first button held
+     * down.
+     *
+     * @param event Motion event when drag tolerance was exceeded.
+     * @return true if you called transferGrab() during this method.
+     */
+    virtual bool grabbed(GdkEventMotion *event);
+
+    /**
+     * Called while dragging, but before moving the knot to new position.
+     *
+     * @param pos Old position, always equal to position()
+     * @param new_pos New position (after drag). This is passed as a non-const reference,
+     *   so you can change it from the handler - that's how constrained dragging is implemented.
+     * @param event Motion event.
+     */
+    virtual void dragged(Geom::Point &new_pos, GdkEventMotion *event);
+
+    /**
+     * Called when the control point finishes a drag.
+     *
+     * @param event Button release event
+     */
+    virtual void ungrabbed(GdkEventButton *event);
+
+    /**
+     * Called when the control point is clicked, at mouse button release.
+     * Improperly implementing this method can cause the default context menu not to appear when a control
+     * point is right-clicked.
+     *
+     * @param event Button release event
+     * @return true if the click had some effect, false if it did nothing.
+     */
+    virtual bool clicked(GdkEventButton *event);
+
+    /**
+     * Called when the control point is doubleclicked, at mouse button release.
+     *
+     * @param event Button release event
+     */
+    virtual bool doubleclicked(GdkEventButton *event);
+    /// @}
+
+    /// @name Manipulate the control point's appearance in subclasses
+    /// @{
+
+    /**
+     * Change the state of the knot.
+     * Alters the appearance of the knot to match one of the states: normal, mouseover
+     * or clicked.
+     */
+    virtual void _setState(State state);
+
+    void _handleControlStyling();
+
+    void _setColors(ColorEntry c);
+
+    void _setSize(unsigned int size);
+
+    void _setControlType(Inkscape::CanvasItemCtrlType type);
+
+    void _setAnchor(SPAnchorType anchor);
+
+    void _setPixbuf(Glib::RefPtr<Gdk::Pixbuf>);
+
+    /**
+     * Determines if the control point is not visible yet still reacting to events.
+     *
+     * @return true if non-visible, false otherwise.
+     */
+    bool _isLurking();
+
+    /**
+     * Sets the control point to be non-visible yet still reacting to events.
+     *
+     * @param lurking true to make non-visible, false otherwise.
+     */
+    void _setLurking(bool lurking);
+
+    /// @}
+
+    virtual Glib::ustring _getTip(unsigned /*state*/) const { return ""; }
+
+    virtual Glib::ustring _getDragTip(GdkEventMotion */*event*/) const { return ""; }
+
+    virtual bool _hasDragTips() const { return false; }
+
+
+    Inkscape::CanvasItemCtrl * _canvas_item_ctrl = nullptr; ///< Visual representation of the control point.
+
+    ColorSet const &_cset; ///< Colors used to represent the point
+
+    State _state = STATE_NORMAL;
+
+    static Geom::Point const &_last_click_event_point() { return _drag_event_origin; }
+
+    static Geom::Point const &_last_drag_origin() { return _drag_origin; }
+
+    static bool _is_drag_cancelled(GdkEventMotion *event);
+
+    /** Events which should be captured when a handle is being dragged. */
+    static Gdk::EventMask const _grab_event_mask;
+
+    static bool _drag_initiated;
+
+private:
+
+    ControlPoint(ControlPoint const &other);
+
+    void operator=(ControlPoint const &other);
+
+    static bool _event_handler(GdkEvent *event, ControlPoint *point);
+
+    static void _setMouseover(ControlPoint *, unsigned state);
+
+    static void _clearMouseover();
+
+    bool _updateTip(unsigned state);
+
+    bool _updateDragTip(GdkEventMotion *event);
+
+    void _setDefaultColors();
+
+    void _commonInit();
+
+    Geom::Point _position; ///< Current position in desktop coordinates
+
+    sigc::connection _event_handler_connection;
+
+    bool _lurking = false;
+
+    static ColorSet _default_color_set;
+
+    /** Stores the window point over which the cursor was during the last mouse button press. */
+    static Geom::Point _drag_event_origin;
+
+    /** Stores the desktop point from which the last drag was initiated. */
+    static Geom::Point _drag_origin;
+
+    static bool _event_grab;
+
+    bool _double_clicked = false;
+};
+
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/curve-drag-point.cpp b/src/ui/tool/curve-drag-point.cpp
new file mode 100644
index 0000000..acf1299
--- /dev/null
+++ b/src/ui/tool/curve-drag-point.cpp
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "ui/tool/curve-drag-point.h"
+#include <glib/gi18n.h>
+#include "desktop.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/multi-path-manipulator.h"
+#include "ui/tool/path-manipulator.h"
+
+#include "object/sp-namedview.h"
+#include "object/sp-path.h"
+
+namespace Inkscape {
+namespace UI {
+
+
+bool CurveDragPoint::_drags_stroke = false;
+bool CurveDragPoint::_segment_was_degenerate = false;
+
+CurveDragPoint::CurveDragPoint(PathManipulator &pm) :
+    ControlPoint(pm._multi_path_manipulator._path_data.node_data.desktop, Geom::Point(), SP_ANCHOR_CENTER,
+                 Inkscape::CANVAS_ITEM_CTRL_TYPE_INVISIPOINT,
+                 invisible_cset, pm._multi_path_manipulator._path_data.dragpoint_group),
+      _pm(pm)
+{
+    _canvas_item_ctrl->set_name("CanvasItemCtrl:CurveDragPoint");
+    setVisible(false);
+}
+
+bool CurveDragPoint::_eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    // do not process any events when the manipulator is empty
+    if (_pm.empty()) {
+        setVisible(false);
+        return false;
+    }
+    return ControlPoint::_eventHandler(event_context, event);
+}
+
+bool CurveDragPoint::grabbed(GdkEventMotion */*event*/)
+{
+    _pm._selection.hideTransformHandles();
+    NodeList::iterator second = first.next();
+
+    // move the handles to 1/3 the length of the segment for line segments
+    if (first->front()->isDegenerate() && second->back()->isDegenerate()) {
+        _segment_was_degenerate = true;
+
+        // delta is a vector equal 1/3 of distance from first to second
+        Geom::Point delta = (second->position() - first->position()) / 3.0;
+        // only update the nodes if the mode is bspline
+        if(!_pm._isBSpline()){
+            first->front()->move(first->front()->position() + delta);
+            second->back()->move(second->back()->position() - delta);
+        }
+        _pm.update();
+    } else {
+        _segment_was_degenerate = false;
+    }
+    return false;
+}
+
+void CurveDragPoint::dragged(Geom::Point &new_pos, GdkEventMotion *event)
+{
+    if (!first || !first.next()) return;
+    NodeList::iterator second = first.next();
+
+    // special cancel handling - retract handles when if the segment was degenerate
+    if (_is_drag_cancelled(event) && _segment_was_degenerate) {
+        first->front()->retract();
+        second->back()->retract();
+        _pm.update();
+        return;
+    }
+
+    if (_drag_initiated && !(event->state & GDK_SHIFT_MASK)) {
+        SnapManager &m = _desktop->namedview->snap_manager;
+        SPItem *path = static_cast<SPItem *>(_pm._path);
+        m.setup(_desktop, true, path); // We will not try to snap to "path" itself
+        Inkscape::SnapCandidatePoint scp(new_pos, Inkscape::SNAPSOURCE_OTHER_HANDLE);
+        Inkscape::SnappedPoint sp = m.freeSnap(scp, Geom::OptRect(), false);
+        new_pos = sp.getPoint();
+        m.unSetup();
+    }
+
+    // Magic Bezier Drag Equations follow!
+    // "weight" describes how the influence of the drag should be distributed
+    // among the handles; 0 = front handle only, 1 = back handle only.
+    double weight, t = _t;
+    if (t <= 1.0 / 6.0) weight = 0;
+    else if (t <= 0.5) weight = (pow((6 * t - 1) / 2.0, 3)) / 2;
+    else if (t <= 5.0 / 6.0) weight = (1 - pow((6 * (1-t) - 1) / 2.0, 3)) / 2 + 0.5;
+    else weight = 1;
+
+    Geom::Point delta = new_pos - position();
+    Geom::Point offset0 = ((1-weight)/(3*t*(1-t)*(1-t))) * delta;
+    Geom::Point offset1 = (weight/(3*t*t*(1-t))) * delta;
+
+    //modified so that, if the trace is bspline, it only acts if the SHIFT key is pressed
+    if(!_pm._isBSpline()){
+        first->front()->move(first->front()->position() + offset0);
+        second->back()->move(second->back()->position() + offset1);
+    }else if(weight>=0.8){
+        if(held_shift(*event)){
+            second->back()->move(new_pos);
+        } else {
+            second->move(second->position() + delta);
+        }
+    }else if(weight<=0.2){
+        if(held_shift(*event)){
+            first->back()->move(new_pos);
+        } else {
+            first->move(first->position() + delta);
+        }
+    }else{
+        first->move(first->position() + delta);
+        second->move(second->position() + delta);
+    }
+    _pm.update();
+}
+
+void CurveDragPoint::ungrabbed(GdkEventButton *)
+{
+    _pm._updateDragPoint(_desktop->d2w(position()));
+    _pm._commit(_("Drag curve"));
+    _pm._selection.restoreTransformHandles();
+}
+
+bool CurveDragPoint::clicked(GdkEventButton *event)
+{
+    // This check is probably redundant
+    if (!first || event->button != 1) return false;
+    // the next iterator can be invalid if we click very near the end of path
+    NodeList::iterator second = first.next();
+    if (!second) return false;
+
+    // insert nodes on Ctrl+Alt+click
+    if (held_control(*event) && held_alt(*event)) {
+        _insertNode(false);
+        return true;
+    }
+
+    if (held_shift(*event)) {
+        // if both nodes of the segment are selected, deselect;
+        // otherwise add to selection
+        if (first->selected() && second->selected())  {
+            _pm._selection.erase(first.ptr());
+            _pm._selection.erase(second.ptr());
+        } else {
+            _pm._selection.insert(first.ptr());
+            _pm._selection.insert(second.ptr());
+        }
+    } else {
+        // without Shift, take selection
+        _pm._selection.clear();
+        _pm._selection.insert(first.ptr());
+        _pm._selection.insert(second.ptr());
+        if (held_control(*event)) {
+            _pm.setSegmentType(Inkscape::UI::SEGMENT_STRAIGHT);
+            _pm.update(true);
+            _pm._commit(_("Straighten segments"));
+        }
+    }
+    return true;
+}
+
+bool CurveDragPoint::doubleclicked(GdkEventButton *event)
+{
+    if (event->button != 1 || !first || !first.next()) return false;
+    if (held_control(*event)) {
+        _pm.deleteSegments();
+        _pm.update(true);
+        _pm._commit(_("Remove segment"));
+    } else {
+        _insertNode(true);
+    }
+    return true;
+}
+
+void CurveDragPoint::_insertNode(bool take_selection)
+{
+    // The purpose of this call is to make way for the just created node.
+    // Otherwise clicks on the new node would only work after the user moves the mouse a bit.
+    // PathManipulator will restore visibility when necessary.
+    setVisible(false);
+
+    _pm.insertNode(first, _t, take_selection);
+}
+
+Glib::ustring CurveDragPoint::_getTip(unsigned state) const
+{
+    if (_pm.empty()) return "";
+    if (!first || !first.next()) return "";
+    bool linear = first->front()->isDegenerate() && first.next()->back()->isDegenerate();
+    if(state_held_shift(state) && _pm._isBSpline()){
+        return C_("Path segment tip",
+            "<b>Shift</b>: drag to open or move BSpline handles");
+    }
+    if (state_held_shift(state)) {
+        return C_("Path segment tip",
+            "<b>Shift</b>: click to toggle segment selection");
+    }
+    if (state_held_control(state) && state_held_alt(state)) {
+        return C_("Path segment tip",
+            "<b>Ctrl+Alt</b>: click to insert a node");
+    }
+    if (state_held_control(state)) {
+        return C_("Path segment tip",
+            "<b>Ctrl</b>: click to change line type");
+    }
+    if(_pm._isBSpline()){
+        return C_("Path segment tip",
+            "<b>BSpline segment</b>: drag to shape the segment, doubleclick to insert node, "
+            "click to select (more: Shift, Ctrl+Alt)");
+    }
+    if (linear) {
+        return C_("Path segment tip",
+            "<b>Linear segment</b>: drag to convert to a Bezier segment, "
+            "doubleclick to insert node, click to select (more: Shift, Ctrl+Alt)");
+    } else {
+        return C_("Path segment tip",
+            "<b>Bezier segment</b>: drag to shape the segment, doubleclick to insert node, "
+            "click to select (more: Shift, Ctrl+Alt)");
+    }
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/curve-drag-point.h b/src/ui/tool/curve-drag-point.h
new file mode 100644
index 0000000..bfe0ad7
--- /dev/null
+++ b/src/ui/tool/curve-drag-point.h
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_CURVE_DRAG_POINT_H
+#define SEEN_UI_TOOL_CURVE_DRAG_POINT_H
+
+#include "ui/tool/control-point.h"
+#include "ui/tool/node.h"
+
+class SPDesktop;
+namespace Inkscape {
+namespace UI {
+
+class PathManipulator;
+struct PathSharedData;
+
+// This point should be invisible to the user - use the invisible_cset from control-point.h
+// TODO make some methods from path-manipulator.cpp public so that this point doesn't have
+// to be declared as a friend
+/**
+ * An invisible point used to drag curves. This point is used by PathManipulator to allow editing
+ * of path segments by dragging them. It is defined in a separate file so that the node tool
+ * can check if the mouseovered control point is a curve drag point and update the cursor
+ * accordingly, without the need to drag in the full PathManipulator header.
+ */
+class CurveDragPoint : public ControlPoint {
+public:
+
+    CurveDragPoint(PathManipulator &pm);
+    void setSize(double sz) { _setSize(sz); }
+    void setTimeValue(double t) { _t = t; }
+    double getTimeValue() { return _t; }
+    void setIterator(NodeList::iterator i) { first = i; }
+    NodeList::iterator getIterator() { return first; }
+    bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) override;
+
+protected:
+
+    Glib::ustring _getTip(unsigned state) const override;
+    void dragged(Geom::Point &, GdkEventMotion *) override;
+    bool grabbed(GdkEventMotion *) override;
+    void ungrabbed(GdkEventButton *) override;
+    bool clicked(GdkEventButton *) override;
+    bool doubleclicked(GdkEventButton *) override;
+
+private:
+    double _t;
+    PathManipulator &_pm;
+    NodeList::iterator first;
+
+    static bool _drags_stroke;
+    static bool _segment_was_degenerate;
+    static Geom::Point _stroke_drag_origin;
+    void _insertNode(bool take_selection);
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/event-utils.cpp b/src/ui/tool/event-utils.cpp
new file mode 100644
index 0000000..f131d4f
--- /dev/null
+++ b/src/ui/tool/event-utils.cpp
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Collection of shorthands to deal with GDK events.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <gdk/gdk.h>
+#include <gdk/gdkkeysyms.h>
+#include <gdkmm/display.h>
+#include "ui/tool/event-utils.h"
+
+namespace Inkscape {
+namespace UI {
+
+
+guint shortcut_key(GdkEventKey const &event)
+{
+    guint shortcut_key = 0;
+    gdk_keymap_translate_keyboard_state(
+            Gdk::Display::get_default()->get_keymap(),
+            event.hardware_keycode,
+            (GdkModifierType) event.state,
+            0   /*event->key.group*/,
+            &shortcut_key, nullptr, nullptr, nullptr);
+    return shortcut_key;
+}
+
+/** Returns the modifier state valid after this event. Use this when you process events
+ * that change the modifier state. Currently handles only Shift, Ctrl, Alt. */
+unsigned state_after_event(GdkEvent *event)
+{
+    unsigned state = 0;
+    switch (event->type) {
+    case GDK_KEY_PRESS:
+        state = event->key.state;
+        switch(shortcut_key(event->key)) {
+        case GDK_KEY_Shift_L:
+        case GDK_KEY_Shift_R:
+            state |= GDK_SHIFT_MASK;
+            break;
+        case GDK_KEY_Control_L:
+        case GDK_KEY_Control_R:
+            state |= GDK_CONTROL_MASK;
+            break;
+        case GDK_KEY_Alt_L:
+        case GDK_KEY_Alt_R:
+            state |= GDK_MOD1_MASK;
+            break;
+        default: break;
+        }
+        break;
+    case GDK_KEY_RELEASE:
+        state = event->key.state;
+        switch(shortcut_key(event->key)) {
+        case GDK_KEY_Shift_L:
+        case GDK_KEY_Shift_R:
+            state &= ~GDK_SHIFT_MASK;
+            break;
+        case GDK_KEY_Control_L:
+        case GDK_KEY_Control_R:
+            state &= ~GDK_CONTROL_MASK;
+            break;
+        case GDK_KEY_Alt_L:
+        case GDK_KEY_Alt_R:
+            state &= ~GDK_MOD1_MASK;
+            break;
+        default: break;
+        }
+        break;
+    default: break;
+    }
+    return state;
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/event-utils.h b/src/ui/tool/event-utils.h
new file mode 100644
index 0000000..37961e3
--- /dev/null
+++ b/src/ui/tool/event-utils.h
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Collection of shorthands to deal with GDK events.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_EVENT_UTILS_H
+#define SEEN_UI_TOOL_EVENT_UTILS_H
+
+#include <gdk/gdk.h>
+#include <2geom/point.h>
+
+namespace Inkscape {
+namespace UI {
+
+inline bool state_held_shift(unsigned state) {
+    return state & GDK_SHIFT_MASK;
+}
+inline bool state_held_control(unsigned state) {
+    return state & GDK_CONTROL_MASK;
+}
+inline bool state_held_alt(unsigned state) {
+    return state & GDK_MOD1_MASK;
+}
+inline bool state_held_only_shift(unsigned state) {
+    return (state & GDK_SHIFT_MASK) && !(state & (GDK_CONTROL_MASK | GDK_MOD1_MASK));
+}
+inline bool state_held_only_control(unsigned state) {
+    return (state & GDK_CONTROL_MASK) && !(state & (GDK_SHIFT_MASK | GDK_MOD1_MASK));
+}
+inline bool state_held_only_alt(unsigned state) {
+    return (state & GDK_MOD1_MASK) && !(state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK));
+}
+inline bool state_held_any_modifiers(unsigned state) {
+    return state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK | GDK_MOD1_MASK);
+}
+inline bool state_held_no_modifiers(unsigned state) {
+    return !state_held_any_modifiers(state);
+}
+template <unsigned button>
+inline bool state_held_button(unsigned state) {
+    return (button == 0 || button > 5) ? false : state & (GDK_BUTTON1_MASK << (button-1));
+}
+
+
+/** Checks whether Shift was held when the event was generated. */
+template <typename E>
+inline bool held_shift(E const &event) {
+    return state_held_shift(event.state);
+}
+
+/** Checks whether Control was held when the event was generated. */
+template <typename E>
+inline bool held_control(E const &event) {
+    return state_held_control(event.state);
+}
+
+/** Checks whether Alt was held when the event was generated. */
+template <typename E>
+inline bool held_alt(E const &event) {
+    return state_held_alt(event.state);
+}
+
+/** True if from the set of Ctrl, Shift and Alt only Ctrl was held when the event
+ * was generated. */
+template <typename E>
+inline bool held_only_control(E const &event) {
+    return state_held_only_control(event.state);
+}
+
+/** True if from the set of Ctrl, Shift and Alt only Shift was held when the event
+ * was generated. */
+template <typename E>
+inline bool held_only_shift(E const &event) {
+    return state_held_only_shift(event.state);
+}
+
+/** True if from the set of Ctrl, Shift and Alt only Alt was held when the event
+ * was generated. */
+template <typename E>
+inline bool held_only_alt(E const &event) {
+    return state_held_only_alt(event.state);
+}
+
+template <typename E>
+inline bool held_no_modifiers(E const &event) {
+    return state_held_no_modifiers(event.state);
+}
+
+template <typename E>
+inline bool held_any_modifiers(E const &event) {
+    return state_held_any_modifiers(event.state);
+}
+
+template <typename E>
+inline Geom::Point event_point(E const &event) {
+    return Geom::Point(event.x, event.y);
+}
+
+/** Use like this:
+ * @code if (held_button<2>(event->motion)) { ... @endcode */
+template <unsigned button, typename E>
+inline bool held_button(E const &event) {
+    return state_held_button<button>(event.state);
+}
+
+guint shortcut_key(GdkEventKey const &event);
+unsigned state_after_event(GdkEvent *event);
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/manipulator.h b/src/ui/tool/manipulator.h
new file mode 100644
index 0000000..308ad1c
--- /dev/null
+++ b/src/ui/tool/manipulator.h
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Manipulator - edits something on-canvas
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_MANIPULATOR_H
+#define SEEN_UI_TOOL_MANIPULATOR_H
+
+#include <set>
+#include <map>
+#include <cstddef>
+#include <sigc++/sigc++.h>
+#include <glib.h>
+#include <gdk/gdk.h>
+#include "ui/tools/tool-base.h"
+
+class SPDesktop;
+namespace Inkscape {
+namespace UI {
+
+class ManipulatorGroup;
+class ControlPointSelection;
+
+/**
+ * @brief Tool component that processes events and does something in response to them.
+ * Note: this class is probably redundant.
+ */
+class Manipulator {
+friend class ManipulatorGroup;
+public:
+    Manipulator(SPDesktop *d)
+        : _desktop(d)
+    {}
+    virtual ~Manipulator() = default;
+    
+    /// Handle input event. Returns true if handled.
+    virtual bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *)=0;
+    SPDesktop *const _desktop;
+};
+
+/**
+ * @brief Tool component that edits something on the canvas using selectable control points.
+ * Note: this class is probably redundant.
+ */
+class PointManipulator : public Manipulator, public sigc::trackable {
+public:
+    PointManipulator(SPDesktop *d, ControlPointSelection &sel)
+        : Manipulator(d)
+        , _selection(sel)
+    {}
+
+    /// Type of extremum points to add in PathManipulator::insertNodeAtExtremum
+    enum ExtremumType {
+        EXTR_MIN_X = 0,
+        EXTR_MAX_X,
+        EXTR_MIN_Y,
+        EXTR_MAX_Y
+    };
+protected:
+    ControlPointSelection &_selection;
+};
+
+/** Manipulator that aggregates several manipulators of the same type.
+ * The order of invoking events on the member manipulators is undefined.
+ * To make this class more useful, derive from it and add actions that can be performed
+ * on all manipulators in the set.
+ *
+ * This is not used at the moment and is probably useless. */
+template <typename T>
+class MultiManipulator : public PointManipulator {
+public:
+    //typedef typename T::ItemType ItemType;
+    typedef typename std::pair<void*, std::shared_ptr<T> > MapPair;
+    typedef typename std::map<void*, std::shared_ptr<T> > MapType;
+
+    MultiManipulator(SPDesktop *d, ControlPointSelection &sel)
+        : PointManipulator(d, sel)
+    {}
+    void addItem(void *item) {
+        std::shared_ptr<T> m(_createManipulator(item));
+        _mmap.insert(MapPair(item, m));
+    }
+    void removeItem(void *item) {
+        _mmap.erase(item);
+    }
+    void clear() {
+        _mmap.clear();
+    }
+    bool contains(void *item) {
+        return _mmap.find(item) != _mmap.end();
+    }
+    bool empty() {
+        return _mmap.empty();
+    }
+    
+    void setItems(std::vector<gpointer> list) { // this function is not called anywhere ... delete ?
+        std::set<void*> to_remove;
+        for (typename MapType::iterator mi = _mmap.begin(); mi != _mmap.end(); ++mi) {
+            to_remove.insert(mi->first);
+        }
+        for (auto i:list) {
+            if (_isItemType(i)) {
+                // erase returns the number of items removed
+                // if nothing was removed, it means this item did not have a manipulator - add it
+                if (!to_remove.erase(i)) addItem(i);
+            }
+        }
+        for (auto ri : to_remove) {
+            removeItem(ri);
+        }
+    }
+
+    /** Invoke a method on all managed manipulators.
+     * Example:
+     * @code m.invokeForAll(&SomeManipulator::someMethod); @endcode
+     */
+    template <typename R>
+    void invokeForAll(R (T::*method)()) {
+        for (typename MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+            ((i->second.get())->*method)();
+        }
+    }
+    template <typename R, typename A>
+    void invokeForAll(R (T::*method)(A), A a) {
+        for (typename MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+            ((i->second.get())->*method)(a);
+        }
+    }
+    template <typename R, typename A>
+    void invokeForAll(R (T::*method)(A const &), A const &a) {
+        for (typename MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+            ((i->second.get())->*method)(a);
+        }
+    }
+    template <typename R, typename A, typename B>
+    void invokeForAll(R (T::*method)(A,B), A a, B b) {
+        for (typename MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+            ((i->second.get())->*method)(a, b);
+        }
+    }
+    
+    bool event(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) override {
+        for (typename MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+            if ((*i).second->event(event_context, event)) return true;
+        }
+        return false;
+    }
+protected:
+    virtual T *_createManipulator(void *item) = 0;
+    virtual bool _isItemType(void *item) = 0;
+    MapType _mmap;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/modifier-tracker.cpp b/src/ui/tool/modifier-tracker.cpp
new file mode 100644
index 0000000..70c85a6
--- /dev/null
+++ b/src/ui/tool/modifier-tracker.cpp
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Fine-grained modifier tracker for event handling.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdk/gdk.h>
+#include <gdk/gdkkeysyms.h>
+#include "ui/tool/event-utils.h"
+#include "ui/tool/modifier-tracker.h"
+
+namespace Inkscape {
+namespace UI {
+
+ModifierTracker::ModifierTracker()
+    : _left_shift(false)
+    , _right_shift(false)
+    , _left_ctrl(false)
+    , _right_ctrl(false)
+    , _left_alt(false)
+    , _right_alt(false)
+{}
+
+bool ModifierTracker::event(GdkEvent *event)
+{
+    switch (event->type) {
+    case GDK_KEY_PRESS:
+        switch (shortcut_key(event->key)) {
+        case GDK_KEY_Shift_L:
+            _left_shift = true;
+            break;
+        case GDK_KEY_Shift_R:
+            _right_shift = true;
+            break;
+        case GDK_KEY_Control_L:
+            _left_ctrl = true;
+            break;
+        case GDK_KEY_Control_R:
+            _right_ctrl = true;
+            break;
+        case GDK_KEY_Alt_L:
+            _left_alt = true;
+            break;
+        case GDK_KEY_Alt_R:
+            _right_alt = true;
+            break;
+        }
+        break;
+    case GDK_KEY_RELEASE:
+        switch (shortcut_key(event->key)) {
+        case GDK_KEY_Shift_L:
+            _left_shift = false;
+            break;
+        case GDK_KEY_Shift_R:
+            _right_shift = false;
+            break;
+        case GDK_KEY_Control_L:
+            _left_ctrl = false;
+            break;
+        case GDK_KEY_Control_R:
+            _right_ctrl = false;
+            break;
+        case GDK_KEY_Alt_L:
+            _left_alt = false;
+            break;
+        case GDK_KEY_Alt_R:
+            _right_alt = false;
+            break;
+        }
+        break;
+    default: break;
+    }
+
+    return false;
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/modifier-tracker.h b/src/ui/tool/modifier-tracker.h
new file mode 100644
index 0000000..c5762e5
--- /dev/null
+++ b/src/ui/tool/modifier-tracker.h
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Fine-grained modifier tracker for event handling.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_MODIFIER_TRACKER_H
+#define SEEN_UI_TOOL_MODIFIER_TRACKER_H
+
+#include <gdk/gdk.h>
+
+namespace Inkscape {
+namespace UI {
+
+class ModifierTracker {
+public:
+    ModifierTracker();
+    bool event(GdkEvent *);
+
+    bool leftShift() const { return _left_shift; }
+    bool rightShift() const { return _right_shift; }
+    bool leftControl() const { return _left_ctrl; }
+    bool rightControl() const { return _right_ctrl; }
+    bool leftAlt() const { return _left_alt; }
+    bool rightAlt() const { return _right_alt; }
+
+private:
+    bool _left_shift;
+    bool _right_shift;
+    bool _left_ctrl;
+    bool _right_ctrl;
+    bool _left_alt;
+    bool _right_alt;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif // SEEN_UI_TOOL_MODIFIER_TRACKER_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/multi-path-manipulator.cpp b/src/ui/tool/multi-path-manipulator.cpp
new file mode 100644
index 0000000..c3bf969
--- /dev/null
+++ b/src/ui/tool/multi-path-manipulator.cpp
@@ -0,0 +1,899 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Multi path manipulator - implementation.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <unordered_set>
+
+#include <gdk/gdkkeysyms.h>
+#include <glibmm/i18n.h>
+
+#include "desktop.h"
+#include "document.h"
+#include "document-undo.h"
+#include "message-stack.h"
+#include "node.h"
+
+#include "live_effects/lpeobject.h"
+
+#include "object/sp-path.h"
+
+#include "ui/icon-names.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/multi-path-manipulator.h"
+#include "ui/tool/path-manipulator.h"
+
+namespace Inkscape {
+namespace UI {
+
+namespace {
+
+struct hash_nodelist_iterator
+    : public std::unary_function<NodeList::iterator, std::size_t>
+{
+    std::size_t operator()(NodeList::iterator i) const {
+        return std::hash<NodeList::iterator::pointer>()(&*i);
+    }
+};
+
+typedef std::pair<NodeList::iterator, NodeList::iterator> IterPair;
+typedef std::vector<IterPair> IterPairList;
+typedef std::unordered_set<NodeList::iterator, hash_nodelist_iterator> IterSet;
+typedef std::multimap<double, IterPair> DistanceMap;
+typedef std::pair<double, IterPair> DistanceMapItem;
+
+/** Find pairs of selected endnodes suitable for joining. */
+void find_join_iterators(ControlPointSelection &sel, IterPairList &pairs)
+{
+    IterSet join_iters;
+
+    // find all endnodes in selection
+    for (auto i : sel) {
+        Node *node = dynamic_cast<Node*>(i);
+        if (!node) continue;
+        NodeList::iterator iter = NodeList::get_iterator(node);
+        if (!iter.next() || !iter.prev()) join_iters.insert(iter);
+    }
+
+    if (join_iters.size() < 2) return;
+
+    // Below we find the closest pairs. The algorithm is O(N^3).
+    // We can go down to O(N^2 log N) by using O(N^2) memory, by putting all pairs
+    // with their distances in a multimap (not worth it IMO).
+    while (join_iters.size() >= 2) {
+        double closest = DBL_MAX;
+        IterPair closest_pair;
+        for (IterSet::iterator i = join_iters.begin(); i != join_iters.end(); ++i) {
+            for (IterSet::iterator j = join_iters.begin(); j != i; ++j) {
+                double dist = Geom::distance(**i, **j);
+                if (dist < closest) {
+                    closest = dist;
+                    closest_pair = std::make_pair(*i, *j);
+                }
+            }
+        }
+        pairs.push_back(closest_pair);
+        join_iters.erase(closest_pair.first);
+        join_iters.erase(closest_pair.second);
+    }
+}
+
+/** After this function, first should be at the end of path and second at the beginning.
+ * @returns True if the nodes are in the same subpath */
+bool prepare_join(IterPair &join_iters)
+{
+    if (&NodeList::get(join_iters.first) == &NodeList::get(join_iters.second)) {
+        if (join_iters.first.next()) // if first is begin, swap the iterators
+            std::swap(join_iters.first, join_iters.second);
+        return true;
+    }
+
+    NodeList &sp_first = NodeList::get(join_iters.first);
+    NodeList &sp_second = NodeList::get(join_iters.second);
+    if (join_iters.first.next()) { // first is begin
+        if (join_iters.second.next()) { // second is begin
+            sp_first.reverse();
+        } else { // second is end
+            std::swap(join_iters.first, join_iters.second);
+        }
+    } else { // first is end
+        if (join_iters.second.next()) { // second is begin
+            // do nothing
+        } else { // second is end
+            sp_second.reverse();
+        }
+    }
+    return false;
+}
+} // anonymous namespace
+
+
+MultiPathManipulator::MultiPathManipulator(PathSharedData &data, sigc::connection &chg)
+    : PointManipulator(data.node_data.desktop, *data.node_data.selection)
+    , _path_data(data)
+    , _changed(chg)
+{
+    _selection.signal_commit.connect(
+        sigc::mem_fun(*this, &MultiPathManipulator::_commit));
+    _selection.signal_selection_changed.connect(
+        sigc::hide( sigc::hide(
+            signal_coords_changed.make_slot())));
+}
+
+MultiPathManipulator::~MultiPathManipulator()
+{
+    _mmap.clear();
+}
+
+/** Remove empty manipulators. */
+void MultiPathManipulator::cleanup()
+{
+    for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ) {
+        if (i->second->empty()) i = _mmap.erase(i);
+        else ++i;
+    }
+}
+
+/**
+ * Change the set of items to edit.
+ *
+ * This method attempts to preserve as much of the state as possible.
+ */
+void MultiPathManipulator::setItems(std::set<ShapeRecord> const &s)
+{
+    std::set<ShapeRecord> shapes(s);
+
+    // iterate over currently edited items, modifying / removing them as necessary
+    for (MapType::iterator i = _mmap.begin(); i != _mmap.end();) {
+        std::set<ShapeRecord>::iterator si = shapes.find(i->first);
+        if (si == shapes.end()) {
+            // This item is no longer supposed to be edited - remove its manipulator
+            i = _mmap.erase(i);
+        } else {
+            ShapeRecord const &sr = i->first;
+            ShapeRecord const &sr_new = *si;
+            // if the shape record differs, replace the key only and modify other values
+            if (sr.edit_transform != sr_new.edit_transform ||
+                sr.role != sr_new.role)
+            {
+                std::shared_ptr<PathManipulator> hold(i->second);
+                if (sr.edit_transform != sr_new.edit_transform)
+                    hold->setControlsTransform(sr_new.edit_transform);
+                if (sr.role != sr_new.role) {
+                    //hold->setOutlineColor(_getOutlineColor(sr_new.role));
+                }
+                i = _mmap.erase(i);
+                _mmap.insert(std::make_pair(sr_new, hold));
+            } else {
+                ++i;
+            }
+            shapes.erase(si); // remove the processed record
+        }
+    }
+
+    // add newly selected items
+    for (const auto & r : shapes) {
+        LivePathEffectObject *lpobj = dynamic_cast<LivePathEffectObject *>(r.object);
+        if (!SP_IS_PATH(r.object) && !lpobj) continue;
+        std::shared_ptr<PathManipulator> newpm(new PathManipulator(*this, (SPPath*) r.object,
+            r.edit_transform, _getOutlineColor(r.role, r.object), r.lpe_key));
+        newpm->showHandles(_show_handles);
+        // always show outlines for clips and masks
+        newpm->showOutline(_show_outline || r.role != SHAPE_ROLE_NORMAL);
+        newpm->showPathDirection(_show_path_direction);
+        newpm->setLiveOutline(_live_outline);
+        newpm->setLiveObjects(_live_objects);
+        _mmap.insert(std::make_pair(r, newpm));
+    }
+}
+
+void MultiPathManipulator::selectSubpaths()
+{
+    if (_selection.empty()) {
+        _selection.selectAll();
+    } else {
+        invokeForAll(&PathManipulator::selectSubpaths);
+    }
+}
+
+void MultiPathManipulator::shiftSelection(int dir)
+{
+    if (empty()) return;
+
+    // 1. find last selected node
+    // 2. select the next node; if the last node or nothing is selected,
+    //    select first node
+    MapType::iterator last_i;
+    SubpathList::iterator last_j;
+    NodeList::iterator last_k;
+    bool anything_found = false;
+    bool anynode_found = false;
+
+    for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+        SubpathList &sp = i->second->subpathList();
+        for (SubpathList::iterator j = sp.begin(); j != sp.end(); ++j) {
+            anynode_found = true;
+            for (NodeList::iterator k = (*j)->begin(); k != (*j)->end(); ++k) {
+                if (k->selected()) {
+                    last_i = i;
+                    last_j = j;
+                    last_k = k;
+                    anything_found = true;
+                    // when tabbing backwards, we want the first node
+                    if (dir == -1) goto exit_loop;
+                }
+            }
+        }
+    }
+    exit_loop:
+
+    // NOTE: we should not assume the _selection contains only nodes
+    // in future it might also contain handles and other types of control points
+    // this is why we use a flag instead in the loop above, instead of calling
+    // selection.empty()
+    if (!anything_found) {
+        // select first / last node
+        // this should never fail because there must be at least 1 non-empty manipulator
+        if (anynode_found) {
+          if (dir == 1) {
+            _selection.insert((*_mmap.begin()->second->subpathList().begin())->begin().ptr());
+          } else {
+            _selection.insert((--(*--(--_mmap.end())->second->subpathList().end())->end()).ptr());
+          }
+        }
+        return;
+    }
+
+    // three levels deep - w00t!
+    if (dir == 1) {
+        if (++last_k == (*last_j)->end()) {
+            // here, last_k points to the node to be selected
+            ++last_j;
+            if (last_j == last_i->second->subpathList().end()) {
+                ++last_i;
+                if (last_i == _mmap.end()) {
+                    last_i = _mmap.begin();
+                }
+                last_j = last_i->second->subpathList().begin();
+            }
+            last_k = (*last_j)->begin();
+        }
+    } else {
+        if (!last_k || last_k == (*last_j)->begin()) {
+            if (last_j == last_i->second->subpathList().begin()) {
+                if (last_i == _mmap.begin()) {
+                    last_i = _mmap.end();
+                }
+                --last_i;
+                last_j = last_i->second->subpathList().end();
+            }
+            --last_j;
+            last_k = (*last_j)->end();
+        }
+        --last_k;
+    }
+    _selection.clear();
+    _selection.insert(last_k.ptr());
+}
+
+void MultiPathManipulator::invertSelectionInSubpaths()
+{
+    invokeForAll(&PathManipulator::invertSelectionInSubpaths);
+}
+
+void MultiPathManipulator::setNodeType(NodeType type)
+{
+    if (_selection.empty()) return;
+
+    // When all selected nodes are already cusp, retract their handles
+    bool retract_handles = (type == NODE_CUSP);
+
+    for (auto i : _selection) {
+        Node *node = dynamic_cast<Node*>(i);
+        if (node) {
+            retract_handles &= (node->type() == NODE_CUSP);
+            node->setType(type);
+        }
+    }
+
+    if (retract_handles) {
+        for (auto i : _selection) {
+            Node *node = dynamic_cast<Node*>(i);
+            if (node) {
+                node->front()->retract();
+                node->back()->retract();
+            }
+        }
+    }
+
+    _done(retract_handles ? _("Retract handles") : _("Change node type"));
+}
+
+void MultiPathManipulator::setSegmentType(SegmentType type)
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::setSegmentType, type);
+    if (type == SEGMENT_STRAIGHT) {
+        _done(_("Straighten segments"));
+    } else {
+        _done(_("Make segments curves"));
+    }
+}
+
+void MultiPathManipulator::insertNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::insertNodes);
+    _done(_("Add nodes"));
+}
+void MultiPathManipulator::insertNodesAtExtrema(ExtremumType extremum)
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::insertNodeAtExtremum, extremum);
+    _done(_("Add extremum nodes"));
+}
+
+void MultiPathManipulator::insertNode(Geom::Point pt)
+{
+    // When double clicking to insert nodes, we might not have a selection of nodes (and we don't need one)
+    // so don't check for "_selection.empty()" here, contrary to the other methods above and below this one
+    invokeForAll(&PathManipulator::insertNode, pt);
+    _done(_("Add nodes"));
+}
+
+void MultiPathManipulator::duplicateNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::duplicateNodes);
+    _done(_("Duplicate nodes"));
+}
+
+void MultiPathManipulator::copySelectedPath(Geom::PathBuilder *builder)
+{
+    if (_selection.empty())
+        return;
+    invokeForAll(&PathManipulator::copySelectedPath, builder);
+    _done(_("Copy nodes"));
+}
+
+void MultiPathManipulator::joinNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::hideDragPoint);
+    // Node join has two parts. In the first one we join two subpaths by fusing endpoints
+    // into one. In the second we fuse nodes in each subpath.
+    IterPairList joins;
+    NodeList::iterator preserve_pos;
+    Node *mouseover_node = dynamic_cast<Node*>(ControlPoint::mouseovered_point);
+    if (mouseover_node) {
+        preserve_pos = NodeList::get_iterator(mouseover_node);
+    }
+    find_join_iterators(_selection, joins);
+
+    for (auto & join : joins) {
+        bool same_path = prepare_join(join);
+        NodeList &sp_first = NodeList::get(join.first);
+        NodeList &sp_second = NodeList::get(join.second);
+        join.first->setType(NODE_CUSP, false);
+
+        Geom::Point joined_pos, pos_handle_front, pos_handle_back;
+        pos_handle_front = *join.second->front();
+        pos_handle_back = *join.first->back();
+
+        // When we encounter the mouseover node, we unset the iterator - it will be invalidated
+        if (join.first == preserve_pos) {
+            joined_pos = *join.first;
+            preserve_pos = NodeList::iterator();
+        } else if (join.second == preserve_pos) {
+            joined_pos = *join.second;
+            preserve_pos = NodeList::iterator();
+        } else {
+            joined_pos = Geom::middle_point(*join.first, *join.second);
+        }
+
+        // if the handles aren't degenerate, don't move them
+        join.first->move(joined_pos);
+        Node *joined_node = join.first.ptr();
+        if (!join.second->front()->isDegenerate()) {
+            joined_node->front()->setPosition(pos_handle_front);
+        }
+        if (!join.first->back()->isDegenerate()) {
+            joined_node->back()->setPosition(pos_handle_back);
+        }
+        sp_second.erase(join.second);
+
+        if (same_path) {
+            sp_first.setClosed(true);
+        } else {
+            sp_first.splice(sp_first.end(), sp_second);
+            sp_second.kill();
+        }
+        _selection.insert(join.first.ptr());
+    }
+
+    if (joins.empty()) {
+        // Second part replaces contiguous selections of nodes with single nodes
+        invokeForAll(&PathManipulator::weldNodes, preserve_pos);
+    }
+
+    _doneWithCleanup(_("Join nodes"), true);
+}
+
+void MultiPathManipulator::breakNodes()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::breakNodes);
+    _done(_("Break nodes"), true);
+}
+
+void MultiPathManipulator::deleteNodes(bool keep_shape)
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::deleteNodes, keep_shape);
+    _doneWithCleanup(_("Delete nodes"), true);
+}
+
+/** Join selected endpoints to create segments. */
+void MultiPathManipulator::joinSegments()
+{
+    if (_selection.empty()) return;
+    IterPairList joins;
+    find_join_iterators(_selection, joins);
+
+    for (auto & join : joins) {
+        bool same_path = prepare_join(join);
+        NodeList &sp_first = NodeList::get(join.first);
+        NodeList &sp_second = NodeList::get(join.second);
+        join.first->setType(NODE_CUSP, false);
+        join.second->setType(NODE_CUSP, false);
+        if (same_path) {
+            sp_first.setClosed(true);
+        } else {
+            sp_first.splice(sp_first.end(), sp_second);
+            sp_second.kill();
+        }
+    }
+
+    if (joins.empty()) {
+        invokeForAll(&PathManipulator::weldSegments);
+    }
+    _doneWithCleanup("Join segments", true);
+}
+
+void MultiPathManipulator::deleteSegments()
+{
+    if (_selection.empty()) return;
+    invokeForAll(&PathManipulator::deleteSegments);
+    _doneWithCleanup("Delete segments", true);
+}
+
+void MultiPathManipulator::alignNodes(Geom::Dim2 d, AlignTargetNode target)
+{
+    if (_selection.empty()) return;
+    _selection.align(d, target);
+    if (d == Geom::X) {
+        _done("Align nodes to a horizontal line");
+    } else {
+        _done("Align nodes to a vertical line");
+    }
+}
+
+void MultiPathManipulator::distributeNodes(Geom::Dim2 d)
+{
+    if (_selection.empty()) return;
+    _selection.distribute(d);
+    if (d == Geom::X) {
+        _done("Distribute nodes horizontally");
+    } else {
+        _done("Distribute nodes vertically");
+    }
+}
+
+void MultiPathManipulator::reverseSubpaths()
+{
+    if (_selection.empty()) {
+        invokeForAll(&PathManipulator::reverseSubpaths, false);
+        _done("Reverse subpaths");
+    } else {
+        invokeForAll(&PathManipulator::reverseSubpaths, true);
+        _done("Reverse selected subpaths");
+    }
+}
+
+void MultiPathManipulator::move(Geom::Point const &delta)
+{
+    if (_selection.empty()) return;
+    _selection.transform(Geom::Translate(delta));
+    _done("Move nodes");
+}
+
+void MultiPathManipulator::showOutline(bool show)
+{
+    for (auto & i : _mmap) {
+        // always show outlines for clipping paths and masks
+        i.second->showOutline(show || i.first.role != SHAPE_ROLE_NORMAL);
+    }
+    _show_outline = show;
+}
+
+void MultiPathManipulator::showHandles(bool show)
+{
+    invokeForAll(&PathManipulator::showHandles, show);
+    _show_handles = show;
+}
+
+void MultiPathManipulator::showPathDirection(bool show)
+{
+    invokeForAll(&PathManipulator::showPathDirection, show);
+    _show_path_direction = show;
+}
+
+/**
+ * Set live outline update status.
+ * When set to true, outline will be updated continuously when dragging
+ * or transforming nodes. Otherwise it will only update when changes are committed
+ * to XML.
+ */
+void MultiPathManipulator::setLiveOutline(bool set)
+{
+    invokeForAll(&PathManipulator::setLiveOutline, set);
+    _live_outline = set;
+}
+
+/**
+ * Set live object update status.
+ * When set to true, objects will be updated continuously when dragging
+ * or transforming nodes. Otherwise they will only update when changes are committed
+ * to XML.
+ */
+void MultiPathManipulator::setLiveObjects(bool set)
+{
+    invokeForAll(&PathManipulator::setLiveObjects, set);
+    _live_objects = set;
+}
+
+void MultiPathManipulator::updateOutlineColors()
+{
+    //for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ++i) {
+    //    i->second->setOutlineColor(_getOutlineColor(i->first.role));
+    //}
+}
+
+void MultiPathManipulator::updateHandles()
+{
+    invokeForAll(&PathManipulator::updateHandles);
+}
+
+void MultiPathManipulator::updatePaths()
+{
+    invokeForAll(&PathManipulator::updatePath);
+}
+
+bool MultiPathManipulator::event(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    _tracker.event(event);
+    guint key = 0;
+    if (event->type == GDK_KEY_PRESS) {
+        key = shortcut_key(event->key);
+    }
+
+    // Single handle adjustments go here.
+    if (_selection.size() == 1 && event->type == GDK_KEY_PRESS) {
+        do {
+            Node *n = dynamic_cast<Node *>(*_selection.begin());
+            if (!n) break;
+
+            PathManipulator &pm = n->nodeList().subpathList().pm();
+
+            int which = 0;
+            if (_tracker.rightAlt() || _tracker.rightControl()) {
+                which = 1;
+            }
+            if (_tracker.leftAlt() || _tracker.leftControl()) {
+                if (which != 0) break; // ambiguous
+                which = -1;
+            }
+            if (which == 0) break; // no handle chosen
+            bool one_pixel = _tracker.leftAlt() || _tracker.rightAlt();
+            bool handled = true;
+
+            switch (key) {
+            // single handle functions
+            // rotation
+            case GDK_KEY_bracketleft:
+            case GDK_KEY_braceleft:
+                pm.rotateHandle(n, which, -_desktop->yaxisdir(), one_pixel);
+                break;
+            case GDK_KEY_bracketright:
+            case GDK_KEY_braceright:
+                pm.rotateHandle(n, which, _desktop->yaxisdir(), one_pixel);
+                break;
+            // adjust length
+            case GDK_KEY_period:
+            case GDK_KEY_greater:
+                pm.scaleHandle(n, which, 1, one_pixel);
+                break;
+            case GDK_KEY_comma:
+            case GDK_KEY_less:
+                pm.scaleHandle(n, which, -1, one_pixel);
+                break;
+            default:
+                handled = false;
+                break;
+            }
+
+            if (handled) return true;
+        } while(false);
+    }
+
+
+    switch (event->type) {
+    case GDK_KEY_PRESS:
+        switch (key) {
+        case GDK_KEY_Insert:
+        case GDK_KEY_KP_Insert:
+            // Insert - insert nodes in the middle of selected segments
+            insertNodes();
+            return true;
+        case GDK_KEY_i:
+        case GDK_KEY_I:
+            if (held_only_shift(event->key)) {
+                // Shift+I - insert nodes (alternate keybinding for Mac keyboards
+                //           that don't have the Insert key)
+                insertNodes();
+                return true;
+            }
+            break;
+        case GDK_KEY_d:
+        case GDK_KEY_D:
+            if (held_only_shift(event->key)) {
+                duplicateNodes();
+                return true;
+            }
+        case GDK_KEY_j:
+        case GDK_KEY_J:
+            if (held_only_shift(event->key)) {
+                // Shift+J - join nodes
+                joinNodes();
+                return true;
+            }
+            if (held_only_alt(event->key)) {
+                // Alt+J - join segments
+                joinSegments();
+                return true;
+            }
+            break;
+        case GDK_KEY_b:
+        case GDK_KEY_B:
+            if (held_only_shift(event->key)) {
+                // Shift+B - break nodes
+                breakNodes();
+                return true;
+            }
+            break;
+        case GDK_KEY_Delete:
+        case GDK_KEY_KP_Delete:
+        case GDK_KEY_BackSpace:
+            if (held_shift(event->key)) break;
+            if (held_alt(event->key)) {
+                // Alt+Delete - delete segments
+                deleteSegments();
+            } else {
+                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+                bool del_preserves_shape = prefs->getBool("/tools/nodes/delete_preserves_shape", true);
+                // pass keep_shape = true when:
+                // a) del preserves shape, and control is not pressed
+                // b) ctrl+del preserves shape (del_preserves_shape is false), and control is pressed
+                // Hence xor
+                guint mode = prefs->getInt("/tools/freehand/pen/freehand-mode", 0);
+
+                //if the trace is bspline ( mode 2)
+                if(mode==2){
+                    //  is this correct ?
+                    if(del_preserves_shape ^ held_control(event->key)){
+                        deleteNodes(false);
+                    } else {
+                        deleteNodes(true);
+                    }
+                } else {
+                    deleteNodes(del_preserves_shape ^ held_control(event->key));
+                }
+
+                // Delete any selected gradient nodes as well
+                event_context->deleteSelectedDrag(held_control(event->key));
+            }
+            return true;
+        case GDK_KEY_c:
+        case GDK_KEY_C:
+            if (held_only_shift(event->key)) {
+                // Shift+C - make nodes cusp
+                setNodeType(NODE_CUSP);
+                return true;
+            }
+            break;
+        case GDK_KEY_s:
+        case GDK_KEY_S:
+            if (held_only_shift(event->key)) {
+                // Shift+S - make nodes smooth
+                setNodeType(NODE_SMOOTH);
+                return true;
+            }
+            break;
+        case GDK_KEY_a:
+        case GDK_KEY_A:
+            if (held_only_shift(event->key)) {
+                // Shift+A - make nodes auto-smooth
+                setNodeType(NODE_AUTO);
+                return true;
+            }
+            break;
+        case GDK_KEY_y:
+        case GDK_KEY_Y:
+            if (held_only_shift(event->key)) {
+                // Shift+Y - make nodes symmetric
+                setNodeType(NODE_SYMMETRIC);
+                return true;
+            }
+            break;
+        case GDK_KEY_r:
+        case GDK_KEY_R:
+            if (held_only_shift(event->key)) {
+                // Shift+R - reverse subpaths
+                reverseSubpaths();
+                return true;
+            }
+            break;
+        case GDK_KEY_l:
+        case GDK_KEY_L:
+            if (held_only_shift(event->key)) {
+                // Shift+L - make segments linear
+                setSegmentType(SEGMENT_STRAIGHT);
+                return true;
+            }
+        case GDK_KEY_u:
+        case GDK_KEY_U:
+            if (held_only_shift(event->key)) {
+                // Shift+U - make segments curves
+                setSegmentType(SEGMENT_CUBIC_BEZIER);
+                return true;
+            }
+        default:
+            break;
+        }
+        break;
+    case GDK_MOTION_NOTIFY:
+        for (auto & i : _mmap) {
+            if (i.second->event(event_context, event)) return true;
+        }
+        break;
+    default: break;
+    }
+
+    return false;
+}
+
+/** Commit changes to XML and add undo stack entry based on the action that was done. Invoked
+ * by sub-manipulators, for example TransformHandleSet and ControlPointSelection. */
+void MultiPathManipulator::_commit(CommitEvent cps)
+{
+    gchar const *reason = nullptr;
+    gchar const *key = nullptr;
+    switch(cps) {
+    case COMMIT_MOUSE_MOVE:
+        reason = _("Move nodes");
+        break;
+    case COMMIT_KEYBOARD_MOVE_X:
+        reason = _("Move nodes horizontally");
+        key = "node:move:x";
+        break;
+    case COMMIT_KEYBOARD_MOVE_Y:
+        reason = _("Move nodes vertically");
+        key = "node:move:y";
+        break;
+    case COMMIT_MOUSE_ROTATE:
+        reason = _("Rotate nodes");
+        break;
+    case COMMIT_KEYBOARD_ROTATE:
+        reason = _("Rotate nodes");
+        key = "node:rotate";
+        break;
+    case COMMIT_MOUSE_SCALE_UNIFORM:
+        reason = _("Scale nodes uniformly");
+        break;
+    case COMMIT_MOUSE_SCALE:
+        reason = _("Scale nodes");
+        break;
+    case COMMIT_KEYBOARD_SCALE_UNIFORM:
+        reason = _("Scale nodes uniformly");
+        key = "node:scale:uniform";
+        break;
+    case COMMIT_KEYBOARD_SCALE_X:
+        reason = _("Scale nodes horizontally");
+        key = "node:scale:x";
+        break;
+    case COMMIT_KEYBOARD_SCALE_Y:
+        reason = _("Scale nodes vertically");
+        key = "node:scale:y";
+        break;
+    case COMMIT_MOUSE_SKEW_X:
+        reason = _("Skew nodes horizontally");
+        key = "node:skew:x";
+        break;
+    case COMMIT_MOUSE_SKEW_Y:
+        reason = _("Skew nodes vertically");
+        key = "node:skew:y";
+        break;
+    case COMMIT_FLIP_X:
+        reason = _("Flip nodes horizontally");
+        break;
+    case COMMIT_FLIP_Y:
+        reason = _("Flip nodes vertically");
+        break;
+    default: return;
+    }
+
+    _selection.signal_update.emit();
+    invokeForAll(&PathManipulator::writeXML);
+    if (key) {
+        DocumentUndo::maybeDone(_desktop->getDocument(), key, reason, INKSCAPE_ICON("tool-node-editor"));
+    } else {
+        DocumentUndo::done(_desktop->getDocument(), reason, INKSCAPE_ICON("tool-node-editor"));
+    }
+    signal_coords_changed.emit();
+}
+
+/** Commits changes to XML and adds undo stack entry. */
+void MultiPathManipulator::_done(gchar const *reason, bool alert_LPE) {
+    invokeForAll(&PathManipulator::update, alert_LPE);
+    invokeForAll(&PathManipulator::writeXML);
+    DocumentUndo::done(_desktop->getDocument(), reason, INKSCAPE_ICON("tool-node-editor"));
+    signal_coords_changed.emit();
+}
+
+/** Commits changes to XML, adds undo stack entry and removes empty manipulators. */
+void MultiPathManipulator::_doneWithCleanup(gchar const *reason, bool alert_LPE) {
+    _changed.block();
+    _done(reason, alert_LPE);
+    cleanup();
+    _changed.unblock();
+}
+
+/** Get an outline color based on the shape's role (normal, mask, LPE parameter, etc.). */
+guint32 MultiPathManipulator::_getOutlineColor(ShapeRole role, SPObject *object)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    switch(role) {
+    case SHAPE_ROLE_CLIPPING_PATH:
+        return prefs->getColor("/tools/nodes/clipping_path_color", 0x00ff00ff);
+    case SHAPE_ROLE_MASK:
+        return prefs->getColor("/tools/nodes/mask_color", 0x0000ffff);
+    case SHAPE_ROLE_LPE_PARAM:
+        return prefs->getColor("/tools/nodes/lpe_param_color", 0x009000ff);
+    case SHAPE_ROLE_NORMAL:
+    default:
+        return SP_ITEM(object)->highlight_color();
+    }
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/multi-path-manipulator.h b/src/ui/tool/multi-path-manipulator.h
new file mode 100644
index 0000000..c00436c
--- /dev/null
+++ b/src/ui/tool/multi-path-manipulator.h
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Multi path manipulator - a tool component that edits multiple paths at once
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_MULTI_PATH_MANIPULATOR_H
+#define SEEN_UI_TOOL_MULTI_PATH_MANIPULATOR_H
+
+#include <cstddef>
+#include <sigc++/connection.h>
+#include <2geom/path-sink.h>
+#include "node.h"
+#include "commit-events.h"
+#include "manipulator.h"
+#include "modifier-tracker.h"
+#include "node-types.h"
+#include "shape-record.h"
+
+struct SPCanvasGroup;
+
+namespace Inkscape {
+namespace UI {
+
+class PathManipulator;
+class MultiPathManipulator;
+struct PathSharedData;
+
+/**
+ * Manipulator that manages multiple path manipulators active at the same time.
+ */
+class MultiPathManipulator : public PointManipulator {
+public:
+    MultiPathManipulator(PathSharedData &data, sigc::connection &chg);
+    ~MultiPathManipulator() override;
+    bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *event) override;
+
+    bool empty() { return _mmap.empty(); }
+    unsigned size() { return _mmap.size(); }
+    void setItems(std::set<ShapeRecord> const &);
+    void clear() { _mmap.clear(); }
+    void cleanup();
+
+    void selectSubpaths();
+    void shiftSelection(int dir);
+    void invertSelectionInSubpaths();
+
+    void setNodeType(NodeType t);
+    void setSegmentType(SegmentType t);
+
+    void insertNodesAtExtrema(ExtremumType extremum);
+    void insertNodes();
+    void insertNode(Geom::Point pt);
+    void alertLPE();
+    void duplicateNodes();
+    void copySelectedPath(Geom::PathBuilder *builder);
+    void joinNodes();
+    void breakNodes();
+    void deleteNodes(bool keep_shape = true);
+    void joinSegments();
+    void deleteSegments();
+    void alignNodes(Geom::Dim2 d, AlignTargetNode target = AlignTargetNode::MID_NODE);
+    void distributeNodes(Geom::Dim2 d);
+    void reverseSubpaths();
+    void move(Geom::Point const &delta);
+
+    void showOutline(bool show);
+    void showHandles(bool show);
+    void showPathDirection(bool show);
+    void setLiveOutline(bool set);
+    void setLiveObjects(bool set);
+    void updateOutlineColors();
+    void updateHandles();
+    void updatePaths();
+    
+    sigc::signal<void> signal_coords_changed; /// Emitted whenever the coordinates
+        /// shown in the status bar need updating
+private:
+    typedef std::pair<ShapeRecord, std::shared_ptr<PathManipulator> > MapPair;
+    typedef std::map<ShapeRecord, std::shared_ptr<PathManipulator> > MapType;
+
+    template <typename R>
+    void invokeForAll(R (PathManipulator::*method)()) {
+        for (MapType::iterator i = _mmap.begin(); i != _mmap.end(); ) {
+            // Sometimes the PathManipulator got freed at loop end, thus
+            // invalidating the iterator so make sure that next_i will
+            // be a valid iterator and then assign i to it.
+            MapType::iterator next_i = i;
+            ++next_i;
+            // i->second is a std::shared_ptr so try to hold on to it so
+            // it won't get freed prematurely by the WriteXML() method or
+            // whatever. See https://bugs.launchpad.net/inkscape/+bug/1617615
+            // Applicable to empty paths.
+            std::shared_ptr<PathManipulator> hold(i->second);
+            ((hold.get())->*method)();
+            i = next_i;
+        }
+    }
+    template <typename R, typename A>
+    void invokeForAll(R (PathManipulator::*method)(A), A a) {
+        for (auto & i : _mmap) {
+            ((i.second.get())->*method)(a);
+        }
+    }
+    template <typename R, typename A>
+    void invokeForAll(R (PathManipulator::*method)(A const &), A const &a) {
+        for (auto & i : _mmap) {
+            ((i.second.get())->*method)(a);
+        }
+    }
+    template <typename R, typename A, typename B>
+    void invokeForAll(R (PathManipulator::*method)(A,B), A a, B b) {
+        for (auto & i : _mmap) {
+            ((i.second.get())->*method)(a, b);
+        }
+    }
+
+    void _commit(CommitEvent cps);
+    void _done(gchar const *reason, bool alert_LPE = true);
+    void _doneWithCleanup(gchar const *reason, bool alert_LPE = false);
+    guint32 _getOutlineColor(ShapeRole role, SPObject *object);
+
+    MapType _mmap;
+public:
+    PathSharedData const &_path_data;
+private:
+    sigc::connection &_changed;
+    ModifierTracker _tracker;
+    bool _show_handles;
+    bool _show_outline;
+    bool _show_path_direction;
+    bool _live_outline;
+    bool _live_objects;
+
+    friend class PathManipulator;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/node-types.h b/src/ui/tool/node-types.h
new file mode 100644
index 0000000..bad6a5c
--- /dev/null
+++ b/src/ui/tool/node-types.h
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Node types and other small enums.
+ * This file exists to reduce the number of includes pulled in by toolbox.cpp.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_NODE_TYPES_H
+#define SEEN_UI_TOOL_NODE_TYPES_H
+
+namespace Inkscape {
+namespace UI {
+
+/** Types of nodes supported in the node tool. */
+enum NodeType {
+    NODE_CUSP, ///< Cusp node - no handle constraints
+    NODE_SMOOTH, ///< Smooth node - handles must be colinear
+    NODE_AUTO, ///< Auto node - handles adjusted automatically based on neighboring nodes
+    NODE_SYMMETRIC, ///< Symmetric node - handles must be colinear and of equal length
+    NODE_LAST_REAL_TYPE, ///< Last real type of node - used for ctrl+click on a node
+    NODE_PICK_BEST = 100 ///< Select type based on handle positions
+};
+
+/** Types of segments supported in the node tool. */
+enum SegmentType {
+    SEGMENT_STRAIGHT, ///< Straight linear segment
+    SEGMENT_CUBIC_BEZIER ///< Bezier curve with two control points
+};
+
+enum class AlignTargetNode {
+    LAST_NODE,
+    FIRST_NODE,
+    MID_NODE,
+    MIN_NODE,
+    MAX_NODE
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/node.cpp b/src/ui/tool/node.cpp
new file mode 100644
index 0000000..57be0af
--- /dev/null
+++ b/src/ui/tool/node.cpp
@@ -0,0 +1,1923 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <atomic>
+#include <iostream>
+#include <stdexcept>
+#include <boost/utility.hpp>
+
+#include <glib/gi18n.h>
+#include <gdk/gdkkeysyms.h>
+
+#include <2geom/bezier-utils.h>
+
+#include "desktop.h"
+#include "multi-path-manipulator.h"
+#include "snap.h"
+
+#include "display/control/canvas-item-group.h"
+#include "display/control/canvas-item-curve.h"
+
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/path-manipulator.h"
+#include "ui/tools/node-tool.h"
+#include "ui/widget/canvas.h"
+
+namespace {
+
+Inkscape::CanvasItemCtrlType nodeTypeToCtrlType(Inkscape::UI::NodeType type)
+{
+    Inkscape::CanvasItemCtrlType result = Inkscape::CANVAS_ITEM_CTRL_TYPE_NODE_CUSP;
+    switch(type) {
+        case Inkscape::UI::NODE_SMOOTH:
+            result = Inkscape::CANVAS_ITEM_CTRL_TYPE_NODE_SMOOTH;
+            break;
+        case Inkscape::UI::NODE_AUTO:
+            result = Inkscape::CANVAS_ITEM_CTRL_TYPE_NODE_AUTO;
+            break;
+        case Inkscape::UI::NODE_SYMMETRIC:
+            result = Inkscape::CANVAS_ITEM_CTRL_TYPE_NODE_SYMETRICAL;
+            break;
+        case Inkscape::UI::NODE_CUSP:
+        default:
+            result = Inkscape::CANVAS_ITEM_CTRL_TYPE_NODE_CUSP;
+            break;
+    }
+    return result;
+}
+
+/**
+ * @brief provides means to estimate float point rounding error due to serialization to svg
+ *
+ *  Keeps cached value up to date with preferences option `/options/svgoutput/numericprecision`
+ *  to avoid costly direct reads
+ * */
+class SvgOutputPrecisionWatcher : public Inkscape::Preferences::Observer {
+public:
+    /// Returns absolute \a value`s rounding serialization error based on current preferences settings
+    static double error_of(double value) {
+        return value * instance().rel_error;
+    }
+
+    void notify(const Inkscape::Preferences::Entry &new_val) override {
+        int digits = new_val.getIntLimited(6, 1, 16);
+        set_numeric_precision(digits);
+    }
+
+private:
+  SvgOutputPrecisionWatcher() : Observer("/options/svgoutput/numericprecision"), rel_error(1) {
+        Inkscape::Preferences::get()->addObserver(*this);
+        int digits = Inkscape::Preferences::get()->getIntLimited("/options/svgoutput/numericprecision", 6, 1, 16);
+        set_numeric_precision(digits);
+    }
+
+    ~SvgOutputPrecisionWatcher() override {
+        Inkscape::Preferences::get()->removeObserver(*this);
+    }
+    /// Update cached value of relative error with number of significant digits
+    void set_numeric_precision(int digits) {
+        double relative_error = 0.5; // the error is half of last digit
+        while (digits > 0) {
+            relative_error /= 10;
+            digits--;
+        }
+        rel_error = relative_error;
+    }
+
+    static SvgOutputPrecisionWatcher &instance() {
+        static SvgOutputPrecisionWatcher _instance;
+        return _instance;
+    }
+
+    std::atomic<double> rel_error; /// Cached relative error
+};
+
+/// Returns absolute error of \a point as if serialized to svg with current preferences
+double serializing_error_of(const Geom::Point &point) {
+    return SvgOutputPrecisionWatcher::error_of(point.length());
+}
+
+/**
+ * @brief Returns true if three points are collinear within current serializing precision
+ *
+ * The algorithm of collinearity check is explicitly used to calculate the check error.
+ *
+ * This function can be sufficiently reduced or even removed completely if `Geom::are_collinear`
+ * would declare it's check algorithm as part of the public API.
+ *
+ * */
+bool are_collinear_within_serializing_error(const Geom::Point &A, const Geom::Point &B, const Geom::Point &C) {
+    const double tolerance_factor = 10; // to account other factors which increase uncertainty
+    const double tolerance_A = serializing_error_of(A) * tolerance_factor;
+    const double tolerance_B = serializing_error_of(B) * tolerance_factor;
+    const double tolerance_C = serializing_error_of(C) * tolerance_factor;
+    const double CB_length = (B - C).length();
+    const double AB_length = (B - A).length();
+    Geom::Point C_reflect_scaled = B + (B - C) / CB_length * AB_length;
+    double tolerance_C_reflect_scaled = tolerance_B
+                                        + (tolerance_B + tolerance_C)
+                                          * (1 + (tolerance_A + tolerance_B) / AB_length)
+                                          * (1 + (tolerance_C + tolerance_B) / CB_length);
+    return Geom::are_near(C_reflect_scaled, A, tolerance_C_reflect_scaled + tolerance_A);
+}
+
+} // namespace
+
+namespace Inkscape {
+namespace UI {
+
+const double NO_POWER = 0.0;
+const double DEFAULT_START_POWER = 1.0/3.0;
+
+ControlPoint::ColorSet Node::node_colors = {
+    {0xbfbfbf00, 0x000000ff}, // normal fill, stroke
+    {0xff000000, 0x000000ff}, // mouseover fill, stroke
+    {0xff000000, 0x000000ff}, // clicked fill, stroke
+    //
+    {0x0000ffff, 0x000000ff}, // normal fill, stroke when selected
+    {0xff000000, 0x000000ff}, // mouseover fill, stroke when selected
+    {0xff000000, 0x000000ff}  // clicked fill, stroke when selected
+};
+
+ControlPoint::ColorSet Handle::_handle_colors = {
+    {0xffffffff, 0x000000ff}, // normal fill, stroke
+    {0xff000000, 0x000000ff}, // mouseover fill, stroke
+    {0xff000000, 0x000000ff}, // clicked fill, stroke
+    //
+    {0xffffffff, 0x000000ff}, // normal fill, stroke
+    {0xff000000, 0x000000ff}, // mouseover fill, stroke
+    {0xff000000, 0x000000ff}  // clicked fill, stroke
+};
+
+std::ostream &operator<<(std::ostream &out, NodeType type)
+{
+    switch(type) {
+    case NODE_CUSP: out << 'c'; break;
+    case NODE_SMOOTH: out << 's'; break;
+    case NODE_AUTO: out << 'a'; break;
+    case NODE_SYMMETRIC: out << 'z'; break;
+    default: out << 'b'; break;
+    }
+    return out;
+}
+
+/** Computes an unit vector of the direction from first to second control point */
+static Geom::Point direction(Geom::Point const &first, Geom::Point const &second) {
+    return Geom::unit_vector(second - first);
+}
+
+Geom::Point Handle::_saved_other_pos(0, 0);
+
+double Handle::_saved_length = 0.0;
+
+bool Handle::_drag_out = false;
+
+Handle::Handle(NodeSharedData const &data, Geom::Point const &initial_pos, Node *parent)
+    : ControlPoint(data.desktop, initial_pos, SP_ANCHOR_CENTER,
+                   Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE,
+                   _handle_colors, data.handle_group)
+    , _handle_line(new Inkscape::CanvasItemCurve(data.handle_line_group))
+    , _parent(parent)
+    , _degenerate(true)
+{
+    setVisible(false);
+}
+
+Handle::~Handle()
+{
+    delete _handle_line;
+}
+
+void Handle::setVisible(bool v)
+{
+    ControlPoint::setVisible(v);
+    if (v) {
+        _handle_line->show();
+    } else {
+        _handle_line->hide();
+    }
+}
+
+void Handle::move(Geom::Point const &new_pos)
+{
+    Handle *other = this->other();
+    Node *node_towards = _parent->nodeToward(this); // node in direction of this handle
+    Node *node_away = _parent->nodeAwayFrom(this); // node in the opposite direction
+    Handle *towards = node_towards ? node_towards->handleAwayFrom(_parent) : nullptr;
+    Handle *towards_second = node_towards ? node_towards->handleToward(_parent) : nullptr;
+    double bspline_weight = 0.0;
+
+    if (Geom::are_near(new_pos, _parent->position())) {
+        // The handle becomes degenerate.
+        // Adjust node type as necessary.
+        if (other->isDegenerate()) {
+            // If both handles become degenerate, convert to parent cusp node
+            _parent->setType(NODE_CUSP, false);
+        } else {
+            // Only 1 handle becomes degenerate
+            switch (_parent->type()) {
+            case NODE_AUTO:
+            case NODE_SYMMETRIC:
+                _parent->setType(NODE_SMOOTH, false);
+                break;
+            default:
+                // do nothing for other node types
+                break;
+            }
+        }
+        // If the segment between the handle and the node in its direction becomes linear,
+        // and there are smooth nodes at its ends, make their handles collinear with the segment.
+        if (towards && towards_second->isDegenerate()) {
+            if (node_towards->type() == NODE_SMOOTH) {
+                towards->setDirection(*_parent, *node_towards);
+            }
+            if (_parent->type() == NODE_SMOOTH) {
+                other->setDirection(*node_towards, *_parent);
+            }
+        }
+        setPosition(new_pos);
+
+        // move the handle and its opposite the same proportion
+        if(_pm()._isBSpline()){
+            setPosition(_pm()._bsplineHandleReposition(this, false));
+            bspline_weight = _pm()._bsplineHandlePosition(this, false);
+            this->other()->setPosition(_pm()._bsplineHandleReposition(this->other(), bspline_weight));
+        }
+        return;
+    }
+
+    if (_parent->type() == NODE_SMOOTH && Node::_is_line_segment(_parent, node_away)) {
+        // restrict movement to the line joining the nodes
+        Geom::Point direction = _parent->position() - node_away->position();
+        Geom::Point delta = new_pos - _parent->position();
+        // project the relative position on the direction line
+        Geom::Coord direction_length = Geom::L2sq(direction);
+        Geom::Point new_delta;
+        if (direction_length == 0) {
+            // joining line has zero length - any direction is okay, prevent division by zero
+            new_delta = delta;
+        } else {
+            new_delta = (Geom::dot(delta, direction) / direction_length) * direction;
+        }
+        setRelativePos(new_delta);
+
+        // move the handle and its opposite the same proportion
+        if(_pm()._isBSpline()){ 
+            setPosition(_pm()._bsplineHandleReposition(this, false));
+            bspline_weight = _pm()._bsplineHandlePosition(this, false);
+            this->other()->setPosition(_pm()._bsplineHandleReposition(this->other(), bspline_weight));
+        }
+        
+        return;
+    }
+
+    switch (_parent->type()) {
+    case NODE_AUTO:
+        _parent->setType(NODE_SMOOTH, false);
+        // fall through - auto nodes degrade into smooth nodes
+    case NODE_SMOOTH: {
+        // for smooth nodes, we need to rotate the opposite handle
+        // so that it's collinear with the dragged one, while conserving length.
+        other->setDirection(new_pos, *_parent);
+        } break;
+    case NODE_SYMMETRIC:
+        // for symmetric nodes, place the other handle on the opposite side
+        other->setRelativePos(-(new_pos - _parent->position()));
+        break;
+    default: break;
+    }
+    setPosition(new_pos);
+
+    // move the handle and its opposite the same proportion
+    if(_pm()._isBSpline()){
+        setPosition(_pm()._bsplineHandleReposition(this, false));
+        bspline_weight = _pm()._bsplineHandlePosition(this, false);
+        this->other()->setPosition(_pm()._bsplineHandleReposition(this->other(), bspline_weight));
+    }
+    Inkscape::UI::Tools::sp_update_helperpath(_desktop);
+}
+
+void Handle::setPosition(Geom::Point const &p)
+{
+    ControlPoint::setPosition(p);
+    _handle_line->set_coords(_parent->position(), position());
+
+    // update degeneration info and visibility
+    if (Geom::are_near(position(), _parent->position()))
+        _degenerate = true;
+    else _degenerate = false;
+
+    if (_parent->_handles_shown && _parent->visible() && !_degenerate) {
+        setVisible(true);
+    } else {
+        setVisible(false);
+    }
+}
+
+void Handle::setLength(double len)
+{
+    if (isDegenerate()) return;
+    Geom::Point dir = Geom::unit_vector(relativePos());
+    setRelativePos(dir * len);
+}
+
+void Handle::retract()
+{
+    move(_parent->position());
+}
+
+void Handle::setDirection(Geom::Point const &from, Geom::Point const &to)
+{
+    setDirection(to - from);
+}
+
+void Handle::setDirection(Geom::Point const &dir)
+{
+    Geom::Point unitdir = Geom::unit_vector(dir);
+    setRelativePos(unitdir * length());
+}
+
+/**
+ * See also: Node::node_type_to_localized_string(NodeType type)
+ */
+char const *Handle::handle_type_to_localized_string(NodeType type)
+{
+    switch(type) {
+    case NODE_CUSP:
+        return _("Corner node handle");
+    case NODE_SMOOTH:
+        return _("Smooth node handle");
+    case NODE_SYMMETRIC:
+        return _("Symmetric node handle");
+    case NODE_AUTO:
+        return _("Auto-smooth node handle");
+    default:
+        return "";
+    }
+}
+
+bool Handle::_eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    switch (event->type)
+    {
+    case GDK_KEY_PRESS:
+
+        switch (shortcut_key(event->key))
+        {
+        case GDK_KEY_s:
+        case GDK_KEY_S:
+
+            /* if Shift+S is pressed while hovering over a cusp node handle,
+               hold the handle in place; otherwise, process normally.
+               this handle is guaranteed not to be degenerate. */
+
+            if (held_only_shift(event->key) && _parent->_type == NODE_CUSP) {
+
+                // make opposite handle collinear,
+                // but preserve length, unless degenerate
+                if (other()->isDegenerate())
+                    other()->setRelativePos(-relativePos());
+                else
+                    other()->setDirection(-relativePos());
+                _parent->setType(NODE_SMOOTH, false);
+
+                // update display
+                _parent->_pm().update();
+
+                // update undo history
+                _parent->_pm()._commit(_("Change node type"));
+
+                return true;
+            }
+            break;
+
+        case GDK_KEY_y:
+        case GDK_KEY_Y:
+
+            /* if Shift+Y is pressed while hovering over a cusp, smooth, or auto node handle,
+               hold the handle in place; otherwise, process normally.
+               this handle is guaranteed not to be degenerate. */
+
+            if (held_only_shift(event->key) && (_parent->_type == NODE_CUSP ||
+                                                _parent->_type == NODE_SMOOTH ||
+                                                _parent->_type == NODE_AUTO)) {
+
+                // make opposite handle collinear, and of equal length
+                other()->setRelativePos(-relativePos());
+                _parent->setType(NODE_SYMMETRIC, false);
+
+                // update display
+                _parent->_pm().update();
+
+                // update undo history
+                _parent->_pm()._commit(_("Change node type"));
+
+                return true;
+            }
+            break;
+        }
+        break;
+
+    case GDK_2BUTTON_PRESS:
+
+        // double-click event to set the handles of a node
+        // to the position specified by DEFAULT_START_POWER
+        handle_2button_press();
+        break;
+    }
+
+    return ControlPoint::_eventHandler(event_context, event);
+}
+
+// this function moves the handle and its opposite to the position specified by DEFAULT_START_POWER
+void Handle::handle_2button_press(){
+    if(_pm()._isBSpline()){
+        setPosition(_pm()._bsplineHandleReposition(this, DEFAULT_START_POWER));
+        this->other()->setPosition(_pm()._bsplineHandleReposition(this->other(), DEFAULT_START_POWER));
+        _pm().update();
+    }
+}
+
+bool Handle::grabbed(GdkEventMotion *)
+{
+    _saved_other_pos = other()->position();
+    _saved_length = _drag_out ? 0 : length();
+    _pm()._handleGrabbed();
+    return false;
+}
+
+void Handle::dragged(Geom::Point &new_pos, GdkEventMotion *event)
+{
+    Geom::Point parent_pos = _parent->position();
+    Geom::Point origin = _last_drag_origin();
+    SnapManager &sm = _desktop->namedview->snap_manager;
+    bool snap = held_shift(*event) ? false : sm.someSnapperMightSnap();
+    std::optional<Inkscape::Snapper::SnapConstraint> ctrl_constraint;
+
+    // with Alt, preserve length
+    if (held_alt(*event)) {
+        new_pos = parent_pos + Geom::unit_vector(new_pos - parent_pos) * _saved_length;
+        snap = false;
+    }
+    // with Ctrl, constrain to M_PI/rotationsnapsperpi increments from vertical
+    // and the original position.
+    if (held_control(*event)) {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        int snaps = 2 * prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+
+        // note: if snapping to the original position is only desired in the original
+        // direction of the handle, change to Ray instead of Line
+        Geom::Line original_line(parent_pos, origin);
+        Geom::Line perp_line(parent_pos, parent_pos + Geom::rot90(origin - parent_pos));
+        Geom::Point snap_pos = parent_pos + Geom::constrain_angle(
+            Geom::Point(0,0), new_pos - parent_pos, snaps, Geom::Point(1,0));
+        Geom::Point orig_pos = original_line.pointAt(original_line.nearestTime(new_pos));
+        Geom::Point perp_pos = perp_line.pointAt(perp_line.nearestTime(new_pos));
+
+        Geom::Point result = snap_pos;
+        ctrl_constraint = Inkscape::Snapper::SnapConstraint(parent_pos, parent_pos - snap_pos);
+        if (Geom::distance(orig_pos, new_pos) < Geom::distance(result, new_pos)) {
+            result = orig_pos;
+            ctrl_constraint = Inkscape::Snapper::SnapConstraint(parent_pos, parent_pos - orig_pos);
+        }
+        if (Geom::distance(perp_pos, new_pos) < Geom::distance(result, new_pos)) {
+            result = perp_pos;
+            ctrl_constraint = Inkscape::Snapper::SnapConstraint(parent_pos, parent_pos - perp_pos);
+        }
+        new_pos = result;
+        // move the handle and its opposite in X fixed positions depending on parameter "steps with control" 
+        // by default in live BSpline
+        if(_pm()._isBSpline()){
+            setPosition(new_pos);
+            int steps = _pm()._bsplineGetSteps();
+            new_pos=_pm()._bsplineHandleReposition(this,ceilf(_pm()._bsplineHandlePosition(this, false)*steps)/steps);
+        }
+    }
+
+    std::vector<Inkscape::SnapCandidatePoint> unselected;
+    // if the snap adjustment is activated and it is not BSpline
+    if (snap && !_pm()._isBSpline()) {
+        ControlPointSelection::Set &nodes = _parent->_selection.allPoints();
+        for (auto node : nodes) {
+            Node *n = static_cast<Node*>(node);
+            unselected.push_back(n->snapCandidatePoint());
+        }
+        sm.setupIgnoreSelection(_desktop, true, &unselected);
+
+        Node *node_away = _parent->nodeAwayFrom(this);
+        if (_parent->type() == NODE_SMOOTH && Node::_is_line_segment(_parent, node_away)) {
+            Inkscape::Snapper::SnapConstraint cl(_parent->position(),
+                _parent->position() - node_away->position());
+            Inkscape::SnappedPoint p;
+            p = sm.constrainedSnap(Inkscape::SnapCandidatePoint(new_pos, SNAPSOURCE_NODE_HANDLE), cl);
+            new_pos = p.getPoint();
+        } else if (ctrl_constraint) {
+            // NOTE: this is subtly wrong.
+            // We should get all possible constraints and snap along them using
+            // multipleConstrainedSnaps, instead of first snapping to angle and then to objects
+            Inkscape::SnappedPoint p;
+            p = sm.constrainedSnap(Inkscape::SnapCandidatePoint(new_pos, SNAPSOURCE_NODE_HANDLE), *ctrl_constraint);
+            new_pos = p.getPoint();
+        } else {
+            sm.freeSnapReturnByRef(new_pos, SNAPSOURCE_NODE_HANDLE);
+        }
+        sm.unSetup();
+    }
+
+
+    // with Shift, if the node is cusp, rotate the other handle as well
+    if (_parent->type() == NODE_CUSP && !_drag_out) {
+        if (held_shift(*event)) {
+            Geom::Point other_relpos = _saved_other_pos - parent_pos;
+            other_relpos *= Geom::Rotate(Geom::angle_between(origin - parent_pos, new_pos - parent_pos));
+            other()->setRelativePos(other_relpos);
+        } else {
+            // restore the position
+            other()->setPosition(_saved_other_pos);
+        }
+    }
+    // if it is BSpline, but SHIFT or CONTROL are not pressed, fix it in the original position
+    if(_pm()._isBSpline() && !held_shift(*event) && !held_control(*event)){
+        new_pos=_last_drag_origin();
+    }
+    _pm().update();
+}
+
+void Handle::ungrabbed(GdkEventButton *event)
+{
+    // hide the handle if it's less than dragtolerance away from the node
+    // however, never do this for cancelled drag / broken grab
+    // TODO is this actually a good idea?
+    if (event) {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        int drag_tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+
+        Geom::Point dist = _desktop->d2w(_parent->position()) - _desktop->d2w(position());
+        if (dist.length() <= drag_tolerance) {
+            move(_parent->position());
+        }
+    }
+
+    // HACK: If the handle was dragged out, call parent's ungrabbed handler,
+    // so that transform handles reappear
+    if (_drag_out) {
+        _parent->ungrabbed(event);
+    }
+    _drag_out = false;
+
+    _pm()._handleUngrabbed();
+}
+
+bool Handle::clicked(GdkEventButton *event)
+{
+    _pm()._handleClicked(this, event);
+    return true;
+}
+
+Handle const *Handle::other() const
+{
+    return const_cast<Handle *>(this)->other();
+}
+
+Handle *Handle::other()
+{
+    if (this == &_parent->_front) {
+        return &_parent->_back;
+    } else {
+        return &_parent->_front;
+    }
+}
+
+static double snap_increment_degrees() {
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int snaps = prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+    return 180.0 / snaps;
+}
+
+Glib::ustring Handle::_getTip(unsigned state) const
+{
+    /* a trick to mark as BSpline if the node has no strength;
+       we are going to use it later to show the appropriate messages.
+       we cannot do it in any different way because the function is constant. */
+    Handle *h = const_cast<Handle *>(this);
+    bool isBSpline = _pm()._isBSpline();
+    bool can_shift_rotate = _parent->type() == NODE_CUSP && !other()->isDegenerate();
+    Glib::ustring s = C_("Path handle tip",
+                         "node control handle");   // not expected
+
+    if (state_held_alt(state) && !isBSpline) {
+        if (state_held_control(state)) {
+            if (state_held_shift(state) && can_shift_rotate) {
+                s = format_tip(C_("Path handle tip",
+                    "<b>Shift+Ctrl+Alt</b>: "
+                    "preserve length and snap rotation angle to %g° increments, "
+                    "and rotate both handles"),
+                    snap_increment_degrees());
+            }
+            else {
+                s = format_tip(C_("Path handle tip",
+                    "<b>Ctrl+Alt</b>: "
+                    "preserve length and snap rotation angle to %g° increments"),
+                    snap_increment_degrees());
+            }
+        }
+        else {
+            if (state_held_shift(state) && can_shift_rotate) {
+                s = C_("Path handle tip",
+                    "<b>Shift+Alt</b>: preserve handle length and rotate both handles");
+            }
+            else {
+                s = C_("Path handle tip",
+                    "<b>Alt</b>: preserve handle length while dragging");
+            }
+        }
+    }
+    else {
+        if (state_held_control(state)) {
+            if (state_held_shift(state) && can_shift_rotate && !isBSpline) {
+                s = format_tip(C_("Path handle tip",
+                    "<b>Shift+Ctrl</b>: "
+                    "snap rotation angle to %g° increments, and rotate both handles"),
+                    snap_increment_degrees());
+            }
+            else if (isBSpline) {
+                s = C_("Path handle tip",
+                    "<b>Ctrl</b>: "
+                    "Snap handle to steps defined in BSpline Live Path Effect");
+            }
+            else {
+                s = format_tip(C_("Path handle tip",
+                    "<b>Ctrl</b>: "
+                    "snap rotation angle to %g° increments, click to retract"),
+                    snap_increment_degrees());
+            }
+        }
+        else if (state_held_shift(state) && can_shift_rotate && !isBSpline) {
+            s = C_("Path handle tip",
+                "<b>Shift</b>: rotate both handles by the same angle");
+        }
+        else if (state_held_shift(state) && isBSpline) {
+            s = C_("Path handle tip",
+                "<b>Shift</b>: move handle");
+        }
+        else {
+            char const *handletype = handle_type_to_localized_string(_parent->_type);
+            char const *more;
+
+            if (can_shift_rotate && !isBSpline) {
+                more = C_("Path handle tip",
+                          "Shift, Ctrl, Alt");
+            }
+            else if (isBSpline) {
+                more = C_("Path handle tip",
+                          "Ctrl");
+            }
+            else {
+                more = C_("Path handle tip",
+                          "Ctrl, Alt");
+            }
+
+            if (_parent->type() == NODE_CUSP) {
+                s = format_tip(C_("Path handle tip",
+                                  "<b>%s</b>: "
+                                  "drag to shape the path"  ", "
+                                  "hover to lock"  ", "
+                                  "Shift+S to make smooth"    ", "
+                                  "Shift+Y to make symmetric" ". "
+                                  "(more: %s)"),
+                               handletype, more);
+            }
+            else if (_parent->type() == NODE_SMOOTH) {
+                s = format_tip(C_("Path handle tip",
+                                  "<b>%s</b>: "
+                                  "drag to shape the path"  ", "
+                                  "hover to lock"  ", "
+                                  "Shift+Y to make symmetric" ". "
+                                  "(more: %s)"),
+                               handletype, more);
+            }
+            else if (_parent->type() == NODE_AUTO) {
+                s = format_tip(C_("Path handle tip",
+                                  "<b>%s</b>: "
+                                  "drag to make smooth, "
+                                  "hover to lock"  ", "
+                                  "Shift+Y to make symmetric" ". "
+                                  "(more: %s)"),
+                               handletype, more);
+            }
+            else if (_parent->type() == NODE_SYMMETRIC) {
+                s = format_tip(C_("Path handle tip",
+                                  "<b>%s</b>: "
+                                  "drag to shape the path" ". "
+                                  "(more: %s)"),
+                               handletype, more);
+            }
+            else if (isBSpline) {
+                double power = _pm()._bsplineHandlePosition(h);
+                s = format_tip(C_("Path handle tip",
+                                  "<b>BSpline node handle</b> (%.3g power): "
+                                  "Shift-drag to move, "
+                                  "double-click to reset. "
+                                  "(more: %s)"),
+                               power, more);
+            }
+            else {
+                s = C_("Path handle tip",
+                       "<b>unknown node handle</b>");   // not expected
+            }
+        }
+    }
+
+    return (s);
+}
+
+Glib::ustring Handle::_getDragTip(GdkEventMotion */*event*/) const
+{
+    Geom::Point dist = position() - _last_drag_origin();
+    // report angle in mathematical convention
+    double angle = Geom::angle_between(Geom::Point(-1,0), position() - _parent->position());
+    angle += M_PI; // angle is (-M_PI...M_PI] - offset by +pi and scale to 0...360
+    angle *= 360.0 / (2 * M_PI);
+    
+    Inkscape::Util::Quantity x_q = Inkscape::Util::Quantity(dist[Geom::X], "px");
+    Inkscape::Util::Quantity y_q = Inkscape::Util::Quantity(dist[Geom::Y], "px");
+    Inkscape::Util::Quantity len_q = Inkscape::Util::Quantity(length(), "px");
+    Glib::ustring x = x_q.string(_desktop->namedview->display_units);
+    Glib::ustring y = y_q.string(_desktop->namedview->display_units);
+    Glib::ustring len = len_q.string(_desktop->namedview->display_units);
+    Glib::ustring ret = format_tip(C_("Path handle tip",
+        "Move handle by %s, %s; angle %.2f°, length %s"), x.c_str(), y.c_str(), angle, len.c_str());
+    return ret;
+}
+
+Node::Node(NodeSharedData const &data, Geom::Point const &initial_pos) :
+    SelectableControlPoint(data.desktop, initial_pos, SP_ANCHOR_CENTER,
+                           Inkscape::CANVAS_ITEM_CTRL_TYPE_NODE_CUSP,
+                           *data.selection,
+                           node_colors, data.node_group),
+    _front(data, initial_pos, this),
+    _back(data, initial_pos, this),
+    _type(NODE_CUSP),
+    _handles_shown(false)
+{
+    _canvas_item_ctrl->set_name("CanvasItemCtrl:Node");
+    // NOTE we do not set type here, because the handles are still degenerate
+}
+
+Node const *Node::_next() const
+{
+    return const_cast<Node*>(this)->_next();
+}
+
+// NOTE: not using iterators won't make this much quicker because iterators can be 100% inlined.
+Node *Node::_next()
+{
+    NodeList::iterator n = NodeList::get_iterator(this).next();
+    if (n) {
+        return n.ptr();
+    } else {
+        return nullptr;
+    }
+}
+
+Node const *Node::_prev() const
+{
+    return const_cast<Node *>(this)->_prev();
+}
+
+Node *Node::_prev()
+{
+    NodeList::iterator p = NodeList::get_iterator(this).prev();
+    if (p) {
+        return p.ptr();
+    } else {
+        return nullptr;
+    }
+}
+
+void Node::move(Geom::Point const &new_pos)
+{
+    // move handles when the node moves.
+    Geom::Point old_pos = position();
+    Geom::Point delta = new_pos - position();
+
+    // save the previous nodes strength to apply it again once the node is moved 
+    double nodeWeight = NO_POWER;
+    double nextNodeWeight = NO_POWER;
+    double prevNodeWeight = NO_POWER;
+    Node *n = this;
+    Node * nextNode = n->nodeToward(n->front());
+    Node * prevNode = n->nodeToward(n->back());
+    nodeWeight = fmax(_pm()._bsplineHandlePosition(n->front(), false),_pm()._bsplineHandlePosition(n->back(), false));
+    if(prevNode){
+        prevNodeWeight = _pm()._bsplineHandlePosition(prevNode->front());
+    }
+    if(nextNode){
+        nextNodeWeight = _pm()._bsplineHandlePosition(nextNode->back());
+    }
+
+    // Save original position for post-processing
+    _unfixed_pos = std::optional<Geom::Point>(position());
+
+    setPosition(new_pos);
+    _front.setPosition(_front.position() + delta);
+    _back.setPosition(_back.position() + delta);
+
+    // move the affected handles. First the node ones, later the adjoining ones.
+    if(_pm()._isBSpline()){
+        _front.setPosition(_pm()._bsplineHandleReposition(this->front(),nodeWeight));
+        _back.setPosition(_pm()._bsplineHandleReposition(this->back(),nodeWeight));
+        if(prevNode){
+            prevNode->front()->setPosition(_pm()._bsplineHandleReposition(prevNode->front(), prevNodeWeight));
+        }
+        if(nextNode){
+            nextNode->back()->setPosition(_pm()._bsplineHandleReposition(nextNode->back(), nextNodeWeight));
+        }
+    }
+}
+
+void Node::transform(Geom::Affine const &m)
+{
+    // save the previous nodes strength to apply it again once the node is moved 
+    double nodeWeight = NO_POWER;
+    double nextNodeWeight = NO_POWER;
+    double prevNodeWeight = NO_POWER;
+    Node *n = this;
+    Node * nextNode = n->nodeToward(n->front());
+    Node * prevNode = n->nodeToward(n->back());
+    nodeWeight = _pm()._bsplineHandlePosition(n->front());
+    if(prevNode){
+        prevNodeWeight = _pm()._bsplineHandlePosition(prevNode->front());
+    }
+    if(nextNode){
+        nextNodeWeight = _pm()._bsplineHandlePosition(nextNode->back());
+    }
+
+    // Save original position for post-processing
+    _unfixed_pos = std::optional<Geom::Point>(position());
+
+    setPosition(position() * m);
+    _front.setPosition(_front.position() * m);
+    _back.setPosition(_back.position() * m);
+
+    // move the involved handles. First the node ones, later the adjoining ones.
+    if(_pm()._isBSpline()){
+        _front.setPosition(_pm()._bsplineHandleReposition(this->front(), nodeWeight));
+        _back.setPosition(_pm()._bsplineHandleReposition(this->back(), nodeWeight));
+        if(prevNode){
+            prevNode->front()->setPosition(_pm()._bsplineHandleReposition(prevNode->front(), prevNodeWeight));
+        }
+        if(nextNode){
+            nextNode->back()->setPosition(_pm()._bsplineHandleReposition(nextNode->back(), nextNodeWeight));
+        }
+    }
+}
+
+Geom::Rect Node::bounds() const
+{
+    Geom::Rect b(position(), position());
+    b.expandTo(_front.position());
+    b.expandTo(_back.position());
+    return b;
+}
+
+/**
+ * Affine transforms keep handle invariants for smooth and symmetric nodes,
+ * but smooth nodes at ends of linear segments and auto nodes need special treatment
+ *
+ * Call this function once you have finished called ::move or ::transform on ALL nodes
+ * that are being transformed in that one operation to avoid problematic bugs.
+ */
+void Node::fixNeighbors()
+{
+    if (!_unfixed_pos)
+        return;
+
+    Geom::Point const new_pos = position();
+
+    // This method restores handle invariants for neighboring nodes,
+    // and invariants that are based on positions of those nodes for this one.
+
+    // Fix auto handles
+    if (_type == NODE_AUTO) _updateAutoHandles();
+    if (*_unfixed_pos != new_pos) {
+        if (_next() && _next()->_type == NODE_AUTO) _next()->_updateAutoHandles();
+        if (_prev() && _prev()->_type == NODE_AUTO) _prev()->_updateAutoHandles();
+    }
+
+    /* Fix smooth handles at the ends of linear segments.
+       Rotate the appropriate handle to be collinear with the segment.
+       If there is a smooth node at the other end of the segment, rotate it too. */
+    Handle *handle, *other_handle;
+    Node *other;
+    if (_is_line_segment(this, _next())) {
+        handle = &_back;
+        other = _next();
+        other_handle = &_next()->_front;
+    } else if (_is_line_segment(_prev(), this)) {
+        handle = &_front;
+        other = _prev();
+        other_handle = &_prev()->_back;
+    } else return;
+
+    if (_type == NODE_SMOOTH && !handle->isDegenerate()) {
+        handle->setDirection(other->position(), new_pos);
+    }
+    // also update the handle on the other end of the segment
+    if (other->_type == NODE_SMOOTH && !other_handle->isDegenerate()) {
+        other_handle->setDirection(new_pos, other->position());
+    }
+
+    _unfixed_pos.reset();
+}
+
+void Node::_updateAutoHandles()
+{
+    // Recompute the position of automatic handles. For endnodes, retract both handles.
+    // (It's only possible to create an end auto node through the XML editor.)
+    if (isEndNode()) {
+        _front.retract();
+        _back.retract();
+        return;
+    }
+
+    // auto nodes automatically adjust their handles to give
+    // an appearance of smoothness, no matter what their surroundings are.
+    Geom::Point vec_next = _next()->position() - position();
+    Geom::Point vec_prev = _prev()->position() - position();
+    double len_next = vec_next.length(), len_prev = vec_prev.length();
+    if (len_next > 0 && len_prev > 0) {
+        // "dir" is an unit vector perpendicular to the bisector of the angle created
+        // by the previous node, this auto node and the next node.
+        Geom::Point dir = Geom::unit_vector((len_prev / len_next) * vec_next - vec_prev);
+        // Handle lengths are equal to 1/3 of the distance from the adjacent node.
+        _back.setRelativePos(-dir * (len_prev / 3));
+        _front.setRelativePos(dir * (len_next / 3));
+    } else {
+        // If any of the adjacent nodes coincides, retract both handles.
+        _front.retract();
+        _back.retract();
+    }
+}
+
+void Node::showHandles(bool v)
+{
+    _handles_shown = v;
+    if (!_front.isDegenerate()) {
+        _front.setVisible(v);
+    }
+    if (!_back.isDegenerate()) {
+        _back.setVisible(v);
+    }
+
+}
+
+void Node::updateHandles()
+{
+    _handleControlStyling();
+
+    _front._handleControlStyling();
+    _back._handleControlStyling();
+}
+
+
+void Node::setType(NodeType type, bool update_handles)
+{
+    if (type == NODE_PICK_BEST) {
+        pickBestType();
+        updateState(); // The size of the control might have changed
+        return;
+    }
+
+    // if update_handles is true, adjust handle positions to match the node type
+    // handle degenerate handles appropriately
+    if (update_handles) {
+        switch (type) {
+        case NODE_CUSP:
+            // nothing to do
+            break;
+        case NODE_AUTO:
+            // auto handles make no sense for endnodes
+            if (isEndNode()) return;
+            _updateAutoHandles();
+            break;
+        case NODE_SMOOTH: {
+            // ignore attempts to make smooth endnodes.
+            if (isEndNode()) return;
+            // rotate handles to be collinear
+            // for degenerate nodes set positions like auto handles
+            bool prev_line = _is_line_segment(_prev(), this);
+            bool next_line = _is_line_segment(this, _next());
+            if (_type == NODE_SMOOTH) {
+                // For a node that is already smooth and has a degenerate handle,
+                // drag out the second handle without changing the direction of the first one.
+                if (_front.isDegenerate()) {
+                    double dist = Geom::distance(_next()->position(), position());
+                    _front.setRelativePos(Geom::unit_vector(-_back.relativePos()) * dist / 3);
+                }
+                if (_back.isDegenerate()) {
+                    double dist = Geom::distance(_prev()->position(), position());
+                    _back.setRelativePos(Geom::unit_vector(-_front.relativePos()) * dist / 3);
+                }
+            } else if (isDegenerate()) {
+                _updateAutoHandles();
+            } else if (_front.isDegenerate()) {
+                // if the front handle is degenerate and next path segment is a line, make back collinear;
+                // otherwise, pull out the other handle to 1/3 of distance to prev.
+                if (next_line) {
+                    _back.setDirection(*_next(), *this);
+                } else if (_prev()) {
+                    Geom::Point dir = direction(_back, *this);
+                    _front.setRelativePos(Geom::distance(_prev()->position(), position()) / 3 * dir);
+                }
+            } else if (_back.isDegenerate()) {
+                if (prev_line) {
+                    _front.setDirection(*_prev(), *this);
+                } else if (_next()) {
+                    Geom::Point dir = direction(_front, *this);
+                    _back.setRelativePos(Geom::distance(_next()->position(), position()) / 3 * dir);
+                }
+            } else {
+                /* both handles are extended. make collinear while keeping length.
+                   first make back collinear with the vector front ---> back,
+                   then make front collinear with back ---> node.
+                   (not back ---> front, because back's position was changed in the first call) */
+                _back.setDirection(_front, _back);
+                _front.setDirection(_back, *this);
+            }
+            } break;
+        case NODE_SYMMETRIC:
+            if (isEndNode()) return; // symmetric handles make no sense for endnodes
+            if (isDegenerate()) {
+                // similar to auto handles but set the same length for both
+                Geom::Point vec_next = _next()->position() - position();
+                Geom::Point vec_prev = _prev()->position() - position();
+                double len_next = vec_next.length(), len_prev = vec_prev.length();
+                double len = (len_next + len_prev) / 6; // take 1/3 of average
+                if (len == 0) return;
+
+                Geom::Point dir = Geom::unit_vector((len_prev / len_next) * vec_next - vec_prev);
+                _back.setRelativePos(-dir * len);
+                _front.setRelativePos(dir * len);
+            } else {
+                // Both handles are extended. Compute average length, use direction from
+                // back handle to front handle. This also works correctly for degenerates
+                double len = (_front.length() + _back.length()) / 2;
+                Geom::Point dir = direction(_back, _front);
+                _front.setRelativePos(dir * len);
+                _back.setRelativePos(-dir * len);
+            }
+            break;
+        default: break;
+        }
+        // in node type changes, for BSpline traces, we can either maintain them
+        // with NO_POWER power in border mode, or give them the default power in curve mode.
+        if(_pm()._isBSpline()){
+            double weight = NO_POWER;
+            if(_pm()._bsplineHandlePosition(this->front()) != NO_POWER ){
+                weight = DEFAULT_START_POWER;
+            }
+            _front.setPosition(_pm()._bsplineHandleReposition(this->front(), weight));
+            _back.setPosition(_pm()._bsplineHandleReposition(this->back(), weight));
+        }
+    }
+    _type = type;
+    _setControlType(nodeTypeToCtrlType(_type));
+    updateState();
+}
+
+void Node::pickBestType()
+{
+    _type = NODE_CUSP;
+    bool front_degen = _front.isDegenerate();
+    bool back_degen = _back.isDegenerate();
+    bool both_degen = front_degen && back_degen;
+    bool neither_degen = !front_degen && !back_degen;
+    do {
+        // if both handles are degenerate, do nothing
+        if (both_degen) break;
+        // if neither are degenerate, check their respective positions
+        if (neither_degen) {
+            // for now do not automatically make nodes symmetric, it can be annoying
+            /*if (Geom::are_near(front_delta, -back_delta)) {
+                _type = NODE_SYMMETRIC;
+                break;
+            }*/
+            if (are_collinear_within_serializing_error(_front.position(), position(), _back.position())) {
+                _type = NODE_SMOOTH;
+                break;
+            }
+        }
+        // check whether the handle aligns with the previous line segment.
+        // we know that if front is degenerate, back isn't, because
+        // both_degen was false
+        if (front_degen && _next() && _next()->_back.isDegenerate()) {
+            if (are_collinear_within_serializing_error(_next()->position(), position(), _back.position())) {
+                _type = NODE_SMOOTH;
+                break;
+            }
+        } else if (back_degen && _prev() && _prev()->_front.isDegenerate()) {
+            if (are_collinear_within_serializing_error(_prev()->position(), position(), _front.position())) {
+                _type = NODE_SMOOTH;
+                break;
+            }
+        }
+    } while (false);
+    _setControlType(nodeTypeToCtrlType(_type));
+    updateState();
+}
+
+bool Node::isEndNode() const
+{
+    return !_prev() || !_next();
+}
+
+void Node::sink()
+{
+    _canvas_item_ctrl->set_z_position(0);
+}
+
+NodeType Node::parse_nodetype(char x)
+{
+    switch (x) {
+    case 'a': return NODE_AUTO;
+    case 'c': return NODE_CUSP;
+    case 's': return NODE_SMOOTH;
+    case 'z': return NODE_SYMMETRIC;
+    default: return NODE_PICK_BEST;
+    }
+}
+
+bool Node::_eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    int dir = 0;
+
+    switch (event->type)
+    {
+    case GDK_SCROLL:
+        if (event->scroll.direction == GDK_SCROLL_UP) {
+            dir = 1;
+        } else if (event->scroll.direction == GDK_SCROLL_DOWN) {
+            dir = -1;
+        } else if (event->scroll.direction == GDK_SCROLL_SMOOTH) {
+            dir = event->scroll.delta_y > 0 ? -1 : 1;
+        } else {
+            break;
+        }
+        if (held_control(event->scroll)) {
+            _linearGrow(dir);
+        } else {
+            _selection.spatialGrow(this, dir);
+        }
+        return true;
+    case GDK_KEY_PRESS:
+        switch (shortcut_key(event->key))
+        {
+        case GDK_KEY_Page_Up:
+            dir = 1;
+            break;
+        case GDK_KEY_Page_Down:
+            dir = -1;
+            break;
+        default: goto bail_out;
+        }
+
+        if (held_control(event->key)) {
+            _linearGrow(dir);
+        } else {
+            _selection.spatialGrow(this, dir);
+        }
+        return true;
+
+    default:
+        break;
+    }
+    
+    bail_out:
+    return ControlPoint::_eventHandler(event_context, event);
+}
+
+void Node::_linearGrow(int dir)
+{
+    // Interestingly, we do not need any help from PathManipulator when doing linear grow.
+    // First handle the trivial case of growing over an unselected node.
+    if (!selected() && dir > 0) {
+        _selection.insert(this);
+        return;
+    }
+
+    NodeList::iterator this_iter = NodeList::get_iterator(this);
+    NodeList::iterator fwd = this_iter, rev = this_iter;
+    double distance_back = 0, distance_front = 0;
+
+    // Linear grow is simple. We find the first unselected nodes in each direction
+    // and compare the linear distances to them.
+    if (dir > 0) {
+        if (!selected()) {
+            _selection.insert(this);
+            return;
+        }
+
+        // find first unselected nodes on both sides
+        while (fwd && fwd->selected()) {
+            NodeList::iterator n = fwd.next();
+            distance_front += Geom::bezier_length(*fwd, fwd->_front, n->_back, *n);
+            fwd = n;
+            if (fwd == this_iter)
+                // there is no unselected node in this cyclic subpath
+                return;
+        }
+        // do the same for the second direction. Do not check for equality with
+        // this node, because there is at least one unselected node in the subpath,
+        // so we are guaranteed to stop.
+        while (rev && rev->selected()) {
+            NodeList::iterator p = rev.prev();
+            distance_back += Geom::bezier_length(*rev, rev->_back, p->_front, *p);
+            rev = p;
+        }
+
+        NodeList::iterator t; // node to select
+        if (fwd && rev) {
+            if (distance_front <= distance_back) t = fwd;
+            else t = rev;
+        } else {
+            if (fwd) t = fwd;
+            if (rev) t = rev;
+        }
+        if (t) _selection.insert(t.ptr());
+
+    // Linear shrink is more complicated. We need to find the farthest selected node.
+    // This means we have to check the entire subpath. We go in the direction in which
+    // the distance we traveled is lower. We do this until we run out of nodes (ends of path)
+    // or the two iterators meet. On the way, we store the last selected node and its distance
+    // in each direction (if any). At the end, we choose the one that is farther and deselect it.
+    } else {
+        // both iterators that store last selected nodes are initially empty
+        NodeList::iterator last_fwd, last_rev;
+        double last_distance_back = 0, last_distance_front = 0;
+
+        while (rev || fwd) {
+            if (fwd && (!rev || distance_front <= distance_back)) {
+                if (fwd->selected()) {
+                    last_fwd = fwd;
+                    last_distance_front = distance_front;
+                }
+                NodeList::iterator n = fwd.next();
+                if (n) distance_front += Geom::bezier_length(*fwd, fwd->_front, n->_back, *n);
+                fwd = n;
+            } else if (rev && (!fwd || distance_front > distance_back)) {
+                if (rev->selected()) {
+                    last_rev = rev;
+                    last_distance_back = distance_back;
+                }
+                NodeList::iterator p = rev.prev();
+                if (p) distance_back += Geom::bezier_length(*rev, rev->_back, p->_front, *p);
+                rev = p;
+            }
+            // Check whether we walked the entire cyclic subpath.
+            // This is initially true because both iterators start from this node,
+            // so this check cannot go in the while condition.
+            // When this happens, we need to check the last node, pointed to by the iterators.
+            if (fwd && fwd == rev) {
+                if (!fwd->selected()) break;
+                NodeList::iterator fwdp = fwd.prev(), revn = rev.next();
+                double df = distance_front + Geom::bezier_length(*fwdp, fwdp->_front, fwd->_back, *fwd);
+                double db = distance_back + Geom::bezier_length(*revn, revn->_back, rev->_front, *rev);
+                if (df > db) {
+                    last_fwd = fwd;
+                    last_distance_front = df;
+                } else {
+                    last_rev = rev;
+                    last_distance_back = db;
+                }
+                break;
+            }
+        }
+
+        NodeList::iterator t;
+        if (last_fwd && last_rev) {
+            if (last_distance_front >= last_distance_back) t = last_fwd;
+            else t = last_rev;
+        } else {
+            if (last_fwd) t = last_fwd;
+            if (last_rev) t = last_rev;
+        }
+        if (t) _selection.erase(t.ptr());
+    }
+}
+
+void Node::_setState(State state)
+{
+    // change node size to match type and selection state
+    _canvas_item_ctrl->set_size_extra(selected() ? 2 : 0);
+    switch (state) {
+        // These were used to set "active" and "prelight" flags but the flags weren't being used.
+        case STATE_NORMAL:
+        case STATE_MOUSEOVER:
+            break;
+        case STATE_CLICKED:
+            // show the handles when selecting the nodes
+            if(_pm()._isBSpline()){
+                this->front()->setPosition(_pm()._bsplineHandleReposition(this->front()));
+                this->back()->setPosition(_pm()._bsplineHandleReposition(this->back()));
+            }
+            break;
+    }
+    SelectableControlPoint::_setState(state);
+}
+
+bool Node::grabbed(GdkEventMotion *event)
+{
+    if (SelectableControlPoint::grabbed(event)) {
+        return true;
+    }
+
+    // Dragging out handles with Shift + drag on a node.
+    if (!held_shift(*event)) {
+        return false;
+    }
+
+    Geom::Point evp = event_point(*event);
+    Geom::Point rel_evp = evp - _last_click_event_point();
+
+    // This should work even if dragtolerance is zero and evp coincides with node position.
+    double angle_next = HUGE_VAL;
+    double angle_prev = HUGE_VAL;
+    bool has_degenerate = false;
+    // determine which handle to drag out based on degeneration and the direction of drag
+    if (_front.isDegenerate() && _next()) {
+        Geom::Point next_relpos = _desktop->d2w(_next()->position())
+            - _desktop->d2w(position());
+        angle_next = fabs(Geom::angle_between(rel_evp, next_relpos));
+        has_degenerate = true;
+    }
+    if (_back.isDegenerate() && _prev()) {
+        Geom::Point prev_relpos = _desktop->d2w(_prev()->position())
+            - _desktop->d2w(position());
+        angle_prev = fabs(Geom::angle_between(rel_evp, prev_relpos));
+        has_degenerate = true;
+    }
+    if (!has_degenerate) {
+        return false;
+    }
+
+    Handle *h = angle_next < angle_prev ? &_front : &_back;
+
+    h->setPosition(_desktop->w2d(evp));
+    h->setVisible(true);
+    h->transferGrab(this, event);
+    Handle::_drag_out = true;
+    return true;
+}
+
+void Node::dragged(Geom::Point &new_pos, GdkEventMotion *event)
+{
+    // For a note on how snapping is implemented in Inkscape, see snap.h.
+    SnapManager &sm = _desktop->namedview->snap_manager;
+    // even if we won't really snap, we might still call the one of the
+    // constrainedSnap() methods to enforce the constraints, so we need
+    // to setup the snapmanager anyway; this is also required for someSnapperMightSnap()
+    sm.setup(_desktop);
+
+    // do not snap when Shift is pressed
+    bool snap = !held_shift(*event) && sm.someSnapperMightSnap();
+
+    Inkscape::SnappedPoint sp;
+    std::vector<Inkscape::SnapCandidatePoint> unselected;
+    if (snap) {
+        /* setup
+         * TODO We are doing this every time a snap happens. It should once be done only once
+         *      per drag - maybe in the grabbed handler?
+         * TODO Unselected nodes vector must be valid during the snap run, because it is not
+         *      copied. Fix this in snap.h and snap.cpp, then the above.
+         * TODO Snapping to unselected segments of selected paths doesn't work yet. */
+
+        // Build the list of unselected nodes.
+        typedef ControlPointSelection::Set Set;
+        Set &nodes = _selection.allPoints();
+        for (auto node : nodes) {
+            if (!node->selected()) {
+                Node *n = static_cast<Node*>(node);
+                Inkscape::SnapCandidatePoint p(n->position(), n->_snapSourceType(), n->_snapTargetType());
+                unselected.push_back(p);
+            }
+        }
+        sm.unSetup();
+        sm.setupIgnoreSelection(_desktop, true, &unselected);
+    }
+
+    // Snap candidate point for free snapping; this will consider snapping tangentially
+    // and perpendicularly and therefore the origin or direction vector must be set
+    Inkscape::SnapCandidatePoint scp_free(new_pos, _snapSourceType());
+
+    std::optional<Geom::Point> front_point, back_point;
+    Geom::Point origin = _last_drag_origin();
+    Geom::Point dummy_cp;
+    if (_front.isDegenerate()) { // If there is no handle for the path segment towards the next node, then this segment is straight
+        if (_is_line_segment(this, _next())) {
+            front_point = _next()->position() - origin;
+            if (_next()->selected()) {
+                dummy_cp = _next()->position() - position();
+                scp_free.addVector(dummy_cp);
+            } else {
+                dummy_cp = _next()->position();
+                scp_free.addOrigin(dummy_cp);
+            }
+        }
+    } else { // .. this path segment is curved
+        front_point = _front.relativePos();
+        scp_free.addVector(*front_point);
+    }
+    if (_back.isDegenerate()) { // If there is no handle for the path segment towards the previous node, then this segment is straight
+        if (_is_line_segment(_prev(), this)) {
+            back_point = _prev()->position() - origin;
+            if (_prev()->selected()) {
+                dummy_cp = _prev()->position() - position();
+                scp_free.addVector(dummy_cp);
+            } else {
+                dummy_cp = _prev()->position();
+                scp_free.addOrigin(dummy_cp);
+            }
+        }
+    } else { // .. this path segment is curved
+        back_point = _back.relativePos();
+        scp_free.addVector(*back_point);
+    }
+
+    if (held_control(*event)) {
+        // We're about to consider a constrained snap, which is already limited to 1D
+        // Therefore tangential or perpendicular snapping will not be considered, and therefore
+        // all calls above to scp_free.addVector() and scp_free.addOrigin() can be neglected
+        std::vector<Inkscape::Snapper::SnapConstraint> constraints;
+        if (held_alt(*event)) { // with Ctrl+Alt, constrain to handle	 lines
+            Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+            int snaps = prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+            double min_angle = M_PI / snaps;
+
+            // If the node is cusp and both handles are retracted (degenerate; straight line segment at both sides of the node), then snap to those line segments
+            if (isDegenerate()) { // Cusp node with both handles retracted
+				if (front_point) {
+					constraints.emplace_back(origin, *front_point);
+				}
+				if (back_point) {
+					constraints.emplace_back(origin, *back_point);
+				}
+            }
+
+            // For smooth nodes, we will also snap to normals of handle lines. For cusp nodes this would be unintuitive and confusing
+            // Only snap to the normals when they are further than snap increment away from the second handle constraint
+            if (_type != NODE_CUSP) {
+            	std::optional<Geom::Point> fperp_point = Geom::rot90(*front_point);
+            	if (fperp_point && (!back_point ||
+					(fabs(Geom::angle_between(*fperp_point, *back_point)) > min_angle &&
+					 fabs(Geom::angle_between(*fperp_point, *back_point)) < M_PI - min_angle)))
+				{
+					constraints.emplace_back(origin, *fperp_point);
+				}
+
+            	std::optional<Geom::Point> bperp_point = Geom::rot90(*back_point);
+				if (bperp_point && (!front_point ||
+					(fabs(Geom::angle_between(*bperp_point, *front_point)) > min_angle &&
+					 fabs(Geom::angle_between(*bperp_point, *front_point)) < M_PI - min_angle)))
+				{
+					constraints.emplace_back(origin, *bperp_point);
+				}
+            }
+
+            sp = sm.multipleConstrainedSnaps(Inkscape::SnapCandidatePoint(new_pos, _snapSourceType()), constraints, held_shift(*event));
+        } else {
+            // with Ctrl, constrain to axes
+            constraints.emplace_back(origin, Geom::Point(1, 0));
+            constraints.emplace_back(origin, Geom::Point(0, 1));
+            sp = sm.multipleConstrainedSnaps(Inkscape::SnapCandidatePoint(new_pos, _snapSourceType()), constraints, held_shift(*event));
+        }
+        new_pos = sp.getPoint();
+    } else if (snap) {
+        Inkscape::SnappedPoint sp = sm.freeSnap(scp_free);
+        new_pos = sp.getPoint();
+    }
+
+    sm.unSetup();
+
+    SelectableControlPoint::dragged(new_pos, event);
+}
+
+bool Node::clicked(GdkEventButton *event)
+{
+    if(_pm()._nodeClicked(this, event))
+        return true;
+    return SelectableControlPoint::clicked(event);
+}
+
+Inkscape::SnapSourceType Node::_snapSourceType() const
+{
+    if (_type == NODE_SMOOTH || _type == NODE_AUTO)
+        return SNAPSOURCE_NODE_SMOOTH;
+    return SNAPSOURCE_NODE_CUSP;
+}
+Inkscape::SnapTargetType Node::_snapTargetType() const
+{
+    if (_type == NODE_SMOOTH || _type == NODE_AUTO)
+        return SNAPTARGET_NODE_SMOOTH;
+    return SNAPTARGET_NODE_CUSP;
+}
+
+Inkscape::SnapCandidatePoint Node::snapCandidatePoint()
+{
+    return SnapCandidatePoint(position(), _snapSourceType(), _snapTargetType());
+}
+
+Handle *Node::handleToward(Node *to)
+{
+    if (_next() == to) {
+        return front();
+    }
+    if (_prev() == to) {
+        return back();
+    }
+    g_error("Node::handleToward(): second node is not adjacent!");
+    return nullptr;
+}
+
+Node *Node::nodeToward(Handle *dir)
+{
+    if (front() == dir) {
+        return _next();
+    }
+    if (back() == dir) {
+        return _prev();
+    }
+    g_error("Node::nodeToward(): handle is not a child of this node!");
+    return nullptr;
+}
+
+Handle *Node::handleAwayFrom(Node *to)
+{
+    if (_next() == to) {
+        return back();
+    }
+    if (_prev() == to) {
+        return front();
+    }
+    g_error("Node::handleAwayFrom(): second node is not adjacent!");
+    return nullptr;
+}
+
+Node *Node::nodeAwayFrom(Handle *h)
+{
+    if (front() == h) {
+        return _prev();
+    }
+    if (back() == h) {
+        return _next();
+    }
+    g_error("Node::nodeAwayFrom(): handle is not a child of this node!");
+    return nullptr;
+}
+
+Glib::ustring Node::_getTip(unsigned state) const
+{
+    bool isBSpline = _pm()._isBSpline();
+    Handle *h = const_cast<Handle *>(&_front);
+    Glib::ustring s = C_("Path node tip",
+                         "node handle");   // not expected
+
+    if (state_held_shift(state)) {
+        bool can_drag_out = (_next() && _front.isDegenerate()) ||
+                            (_prev() &&  _back.isDegenerate());
+
+        if (can_drag_out) {
+            /*if (state_held_control(state)) {
+                s = format_tip(C_("Path node tip",
+                    "<b>Shift+Ctrl:</b> drag out a handle and snap its angle "
+                    "to %f° increments"), snap_increment_degrees());
+            }*/
+            s = C_("Path node tip",
+                "<b>Shift</b>: drag out a handle, click to toggle selection");
+        }
+        else {
+            s = C_("Path node tip",
+                   "<b>Shift</b>: click to toggle selection");
+        }
+    }
+
+    else if (state_held_control(state)) {
+        if (state_held_alt(state)) {
+            s = C_("Path node tip",
+                   "<b>Ctrl+Alt</b>: move along handle lines, click to delete node");
+        }
+        else {
+            s = C_("Path node tip",
+            "<b>Ctrl</b>: move along axes, click to change node type");
+        }
+    }
+
+    else if (state_held_alt(state)) {
+        s = C_("Path node tip",
+               "<b>Alt</b>: sculpt nodes");
+    }
+
+    else {   // No modifiers: assemble tip from node type
+        char const *nodetype = node_type_to_localized_string(_type);
+        double power = _pm()._bsplineHandlePosition(h);
+
+        if (_selection.transformHandlesEnabled() && selected()) {
+            if (_selection.size() == 1) {
+                if (!isBSpline) {
+                    s = format_tip(C_("Path node tip",
+                                      "<b>%s</b>: "
+                                      "drag to shape the path" ". "
+                                      "(more: Shift, Ctrl, Alt)"),
+                                   nodetype);
+                }
+                else {
+                    s = format_tip(C_("Path node tip",
+                                      "<b>BSpline node</b> (%.3g power): "
+                                      "drag to shape the path" ". "
+                                      "(more: Shift, Ctrl, Alt)"),
+                                   power);
+                }
+            }
+            else {
+                s = format_tip(C_("Path node tip",
+                                  "<b>%s</b>: "
+                                  "drag to shape the path"   ", "
+                                  "click to toggle scale/rotation handles" ". "
+                                  "(more: Shift, Ctrl, Alt)"),
+                               nodetype);
+            }
+        }
+        else if (!isBSpline) {
+            s = format_tip(C_("Path node tip",
+                              "<b>%s</b>: "
+                              "drag to shape the path"   ", "
+                              "click to select only this node" ". "
+                              "(more: Shift, Ctrl, Alt)"),
+                           nodetype);
+        }
+        else {
+            s = format_tip(C_("Path node tip",
+                              "<b>BSpline node</b> (%.3g power): "
+                              "drag to shape the path"   ", "
+                              "click to select only this node" ". "
+                              "(more: Shift, Ctrl, Alt)"),
+                           power);
+        }
+    }
+
+    return (s);
+}
+
+Glib::ustring Node::_getDragTip(GdkEventMotion */*event*/) const
+{
+    Geom::Point dist = position() - _last_drag_origin();
+    
+    Inkscape::Util::Quantity x_q = Inkscape::Util::Quantity(dist[Geom::X], "px");
+    Inkscape::Util::Quantity y_q = Inkscape::Util::Quantity(dist[Geom::Y], "px");
+    Glib::ustring x = x_q.string(_desktop->namedview->display_units);
+    Glib::ustring y = y_q.string(_desktop->namedview->display_units);
+    Glib::ustring ret = format_tip(C_("Path node tip", "Move node by %s, %s"), x.c_str(), y.c_str());
+    return ret;
+}
+
+/**
+ * See also: Handle::handle_type_to_localized_string(NodeType type)
+ */
+char const *Node::node_type_to_localized_string(NodeType type)
+{
+    switch (type) {
+    case NODE_CUSP:
+        return _("Corner node");
+    case NODE_SMOOTH:
+        return _("Smooth node");
+    case NODE_SYMMETRIC:
+        return _("Symmetric node");
+    case NODE_AUTO:
+        return _("Auto-smooth node");
+    default:
+        return "";
+    }
+}
+
+bool Node::_is_line_segment(Node *first, Node *second)
+{
+    if (!first || !second) return false;
+    if (first->_next() == second)
+        return first->_front.isDegenerate() && second->_back.isDegenerate();
+    if (second->_next() == first)
+        return second->_front.isDegenerate() && first->_back.isDegenerate();
+    return false;
+}
+
+NodeList::NodeList(SubpathList &splist)
+    : _list(splist)
+    , _closed(false)
+{
+    this->ln_list = this;
+    this->ln_next = this;
+    this->ln_prev = this;
+}
+
+NodeList::~NodeList()
+{
+    clear();
+}
+
+bool NodeList::empty()
+{
+    return ln_next == this;
+}
+
+NodeList::size_type NodeList::size()
+{
+    size_type sz = 0;
+    for (ListNode *ln = ln_next; ln != this; ln = ln->ln_next) ++sz;
+    return sz;
+}
+
+bool NodeList::closed()
+{
+    return _closed;
+}
+
+bool NodeList::degenerate()
+{
+    return closed() ? empty() : ++begin() == end();
+}
+
+NodeList::iterator NodeList::before(double t, double *fracpart)
+{
+    double intpart;
+    *fracpart = std::modf(t, &intpart);
+    int index = intpart;
+
+    iterator ret = begin();
+    std::advance(ret, index);
+    return ret;
+}
+
+NodeList::iterator NodeList::before(Geom::PathTime const &pvp)
+{
+    iterator ret = begin();
+    std::advance(ret, pvp.curve_index);
+    return ret;
+}
+
+NodeList::iterator NodeList::insert(iterator pos, Node *x)
+{
+    ListNode *ins = pos._node;
+    x->ln_next = ins;
+    x->ln_prev = ins->ln_prev;
+    ins->ln_prev->ln_next = x;
+    ins->ln_prev = x;
+    x->ln_list = this;
+    return iterator(x);
+}
+
+void NodeList::splice(iterator pos, NodeList &list)
+{
+    splice(pos, list, list.begin(), list.end());
+}
+
+void NodeList::splice(iterator pos, NodeList &list, iterator i)
+{
+    NodeList::iterator j = i;
+    ++j;
+    splice(pos, list, i, j);
+}
+
+void NodeList::splice(iterator pos, NodeList &/*list*/, iterator first, iterator last)
+{
+    ListNode *ins_beg = first._node, *ins_end = last._node, *at = pos._node;
+    for (ListNode *ln = ins_beg; ln != ins_end; ln = ln->ln_next) {
+        ln->ln_list = this;
+    }
+    ins_beg->ln_prev->ln_next = ins_end;
+    ins_end->ln_prev->ln_next = at;
+    at->ln_prev->ln_next = ins_beg;
+
+    ListNode *atprev = at->ln_prev;
+    at->ln_prev = ins_end->ln_prev;
+    ins_end->ln_prev = ins_beg->ln_prev;
+    ins_beg->ln_prev = atprev;
+}
+
+void NodeList::shift(int n)
+{
+    // 1. make the list perfectly cyclic
+    ln_next->ln_prev = ln_prev;
+    ln_prev->ln_next = ln_next;
+    // 2. find new begin
+    ListNode *new_begin = ln_next;
+    if (n > 0) {
+        for (; n > 0; --n) new_begin = new_begin->ln_next;
+    } else {
+        for (; n < 0; ++n) new_begin = new_begin->ln_prev;
+    }
+    // 3. relink begin to list
+    ln_next = new_begin;
+    ln_prev = new_begin->ln_prev;
+    new_begin->ln_prev->ln_next = this;
+    new_begin->ln_prev = this;
+}
+
+void NodeList::reverse()
+{
+    for (ListNode *ln = ln_next; ln != this; ln = ln->ln_prev) {
+        std::swap(ln->ln_next, ln->ln_prev);
+        Node *node = static_cast<Node*>(ln);
+        Geom::Point save_pos = node->front()->position();
+        node->front()->setPosition(node->back()->position());
+        node->back()->setPosition(save_pos);
+    }
+    std::swap(ln_next, ln_prev);
+}
+
+void NodeList::clear()
+{
+    // ugly but more efficient clearing mechanism
+    std::vector<ControlPointSelection *> to_clear;
+    std::vector<std::pair<SelectableControlPoint *, long> > nodes;
+    long in = -1;
+    for (iterator i = begin(); i != end(); ++i) {
+        SelectableControlPoint *rm = static_cast<Node*>(i._node);
+        if (std::find(to_clear.begin(), to_clear.end(), &rm->_selection) == to_clear.end()) {
+            to_clear.push_back(&rm->_selection);
+            ++in;
+        }
+        nodes.emplace_back(rm, in);
+    }
+    for (size_t i = 0, e = nodes.size(); i != e; ++i) {
+        to_clear[nodes[i].second]->erase(nodes[i].first, false);
+    }
+    std::vector<std::vector<SelectableControlPoint *> > emission;
+    for (long i = 0, e = to_clear.size(); i != e; ++i) {
+        emission.emplace_back();
+        for (size_t j = 0, f = nodes.size(); j != f; ++j) {
+            if (nodes[j].second != i)
+                break;
+            emission[i].push_back(nodes[j].first);
+        }
+    }
+
+    for (size_t i = 0, e = emission.size(); i != e; ++i) {
+        to_clear[i]->signal_selection_changed.emit(emission[i], false);
+    }
+
+    for (iterator i = begin(); i != end();)
+        erase (i++);
+}
+
+NodeList::iterator NodeList::erase(iterator i)
+{
+    // some gymnastics are required to ensure that the node is valid when deleted;
+    // otherwise the code that updates handle visibility will break
+    Node *rm = static_cast<Node*>(i._node);
+    ListNode *rmnext = rm->ln_next, *rmprev = rm->ln_prev;
+    ++i;
+    delete rm;
+    rmprev->ln_next = rmnext;
+    rmnext->ln_prev = rmprev;
+    return i;
+}
+
+// TODO this method is very ugly!
+// converting SubpathList to an intrusive list might allow us to get rid of it
+void NodeList::kill()
+{
+    for (SubpathList::iterator i = _list.begin(); i != _list.end(); ++i) {
+        if (i->get() == this) {
+            _list.erase(i);
+            return;
+        }
+    }
+}
+
+NodeList &NodeList::get(Node *n) {
+    return n->nodeList();
+}
+NodeList &NodeList::get(iterator const &i) {
+    return *(i._node->ln_list);
+}
+
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/node.h b/src/ui/tool/node.h
new file mode 100644
index 0000000..0630e4f
--- /dev/null
+++ b/src/ui/tool/node.h
@@ -0,0 +1,532 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Editable node and associated data structures.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_NODE_H
+#define SEEN_UI_TOOL_NODE_H
+
+#include <iterator>
+#include <iosfwd>
+#include <stdexcept>
+#include <cstddef>
+#include <functional>
+
+#include "ui/tool/selectable-control-point.h"
+#include "snapped-point.h"
+#include "ui/tool/node-types.h"
+
+namespace Inkscape {
+class CanvasItemGroup;
+class CanvasItemCurve;
+
+namespace UI {
+template <typename> class NodeIterator;
+}
+}
+
+namespace Inkscape {
+namespace UI {
+
+class PathManipulator;
+class MultiPathManipulator;
+
+class Node;
+class Handle;
+class NodeList;
+class SubpathList;
+template <typename> class NodeIterator;
+
+std::ostream &operator<<(std::ostream &, NodeType);
+
+/*
+template <typename T>
+struct ListMember {
+    T *next;
+    T *prev;
+};
+struct SubpathMember : public ListMember<NodeListMember> {
+    Subpath *list;
+};
+struct SubpathListMember : public ListMember<SubpathListMember> {
+    SubpathList *list;
+};
+*/
+
+struct ListNode {
+    ListNode *ln_next;
+    ListNode *ln_prev;
+    NodeList *ln_list;
+};
+
+struct NodeSharedData {
+    SPDesktop *desktop;
+    ControlPointSelection *selection;
+    Inkscape::CanvasItemGroup *node_group;
+    Inkscape::CanvasItemGroup *handle_group;
+    Inkscape::CanvasItemGroup *handle_line_group;
+};
+
+class Handle : public ControlPoint {
+public:
+
+    ~Handle() override;
+    inline Geom::Point relativePos() const;
+    inline double length() const;
+    bool isDegenerate() const { return _degenerate; } // True if the handle is retracted, i.e. has zero length.
+
+    void setVisible(bool) override;
+    void move(Geom::Point const &p) override;
+
+    void setPosition(Geom::Point const &p) override;
+    inline void setRelativePos(Geom::Point const &p);
+    void setLength(double len);
+    void retract();
+    void setDirection(Geom::Point const &from, Geom::Point const &to);
+    void setDirection(Geom::Point const &dir);
+    Node *parent() { return _parent; }
+    Handle *other();
+    Handle const *other() const;
+
+    static char const *handle_type_to_localized_string(NodeType type);
+
+protected:
+
+    Handle(NodeSharedData const &data, Geom::Point const &initial_pos, Node *parent);
+    virtual void handle_2button_press();
+    bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) override;
+    void dragged(Geom::Point &new_pos, GdkEventMotion *event) override;
+    bool grabbed(GdkEventMotion *event) override;
+    void ungrabbed(GdkEventButton *event) override;
+    bool clicked(GdkEventButton *event) override;
+
+    Glib::ustring _getTip(unsigned state) const override;
+    Glib::ustring _getDragTip(GdkEventMotion *event) const override;
+    bool _hasDragTips() const override { return true; }
+
+private:
+
+    inline PathManipulator &_pm();
+    inline PathManipulator &_pm() const;
+    Node *_parent; // the handle's lifetime does not extend beyond that of the parent node,
+    // so a naked pointer is OK and allows setting it during Node's construction
+    CanvasItemCurve *_handle_line;
+    bool _degenerate; // True if the handle is retracted, i.e. has zero length. This is used often internally so it makes sense to cache this
+
+    /**
+     * Control point of a cubic Bezier curve in a path.
+     *
+     * Handle keeps the node type invariant only for the opposite handle of the same node.
+     * Keeping the invariant on node moves is left to the %Node class.
+     */
+    static Geom::Point _saved_other_pos;
+
+    static double _saved_length;
+    static bool _drag_out;
+    static ColorSet _handle_colors;
+    friend class Node;
+};
+
+class Node : ListNode, public SelectableControlPoint {
+public:
+
+    /**
+     * Curve endpoint in an editable path.
+     *
+     * The method move() keeps node type invariants during translations.
+     */
+    Node(NodeSharedData const &data, Geom::Point const &pos);
+
+    Node(Node const &) = delete;
+
+    void move(Geom::Point const &p) override;
+    void transform(Geom::Affine const &m) override;
+    void fixNeighbors() override;
+    Geom::Rect bounds() const override;
+
+    NodeType type() const { return _type; }
+
+    /**
+     * Sets the node type and optionally restores the invariants associated with the given type.
+     * @param type The type to set.
+     * @param update_handles Whether to restore invariants associated with the given type.
+     *                       Passing false is useful e.g. when initially creating the path,
+     *                       and when making cusp nodes during some node algorithms.
+     *                       Pass true when used in response to an UI node type button.
+     */
+    void setType(NodeType type, bool update_handles = true);
+
+    void showHandles(bool v);
+
+    void updateHandles();
+
+
+    /**
+     * Pick the best type for this node, based on the position of its handles.
+     * This is what assigns types to nodes created using the pen tool.
+     */
+    void pickBestType(); // automatically determine the type from handle positions
+
+    bool isDegenerate() const { return _front.isDegenerate() && _back.isDegenerate(); }
+    bool isEndNode() const;
+    Handle *front() { return &_front; }
+    Handle *back()  { return &_back;  }
+
+    /**
+     * Gets the handle that faces the given adjacent node.
+     * Will abort with error if the given node is not adjacent.
+     */
+    Handle *handleToward(Node *to);
+
+    /**
+     * Gets the node in the direction of the given handle.
+     * Will abort with error if the handle doesn't belong to this node.
+     */
+    Node *nodeToward(Handle *h);
+
+    /**
+     * Gets the handle that goes in the direction opposite to the given adjacent node.
+     * Will abort with error if the given node is not adjacent.
+     */
+    Handle *handleAwayFrom(Node *to);
+
+    /**
+     * Gets the node in the direction opposite to the given handle.
+     * Will abort with error if the handle doesn't belong to this node.
+     */
+    Node *nodeAwayFrom(Handle *h);
+
+    NodeList &nodeList() { return *(static_cast<ListNode*>(this)->ln_list); }
+    NodeList &nodeList() const { return *(static_cast<ListNode const*>(this)->ln_list); }
+
+    /**
+     * Move the node to the bottom of its canvas group.
+     * Useful for node break, to ensure that the selected nodes are above the unselected ones.
+     */
+    void sink();
+
+    static NodeType parse_nodetype(char x);
+    static char const *node_type_to_localized_string(NodeType type);
+
+    // temporarily public
+    /** Customized event handler to catch scroll events needed for selection grow/shrink. */
+    bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) override;
+
+    Inkscape::SnapCandidatePoint snapCandidatePoint();
+
+protected:
+
+    void dragged(Geom::Point &new_pos, GdkEventMotion *event) override;
+    bool grabbed(GdkEventMotion *event) override;
+    bool clicked(GdkEventButton *event) override;
+
+    void _setState(State state) override;
+    Glib::ustring _getTip(unsigned state) const override;
+    Glib::ustring _getDragTip(GdkEventMotion *event) const override;
+    bool _hasDragTips() const override { return true; }
+
+private:
+
+    void _updateAutoHandles();
+
+    /**
+     * Select or deselect a node in this node's subpath based on its path distance from this node.
+     * @param dir If negative, shrink selection by one node; if positive, grow by one node.
+     */
+    void _linearGrow(int dir);
+
+    Node *_next();
+    Node const *_next() const;
+    Node *_prev();
+    Node const *_prev() const;
+    Inkscape::SnapSourceType _snapSourceType() const;
+    Inkscape::SnapTargetType _snapTargetType() const;
+    inline PathManipulator &_pm();
+    inline PathManipulator &_pm() const;
+
+    /** Determine whether two nodes are joined by a linear segment. */
+    static bool _is_line_segment(Node *first, Node *second);
+
+    // Handles are always present, but are not visible if they coincide with the node
+    // (are degenerate). A segment that has both handles degenerate is always treated
+    // as a line segment
+    Handle _front; ///< Node handle in the backward direction of the path
+    Handle _back; ///< Node handle in the forward direction of the path
+    NodeType _type; ///< Type of node - cusp, smooth...
+    bool _handles_shown;
+    static ColorSet node_colors;
+
+    // This is used by fixNeighbors to repair smooth nodes after all move
+    // operations have been completed. If this is empty, no fixing is needed.
+    std::optional<Geom::Point> _unfixed_pos;
+
+    friend class Handle;
+    friend class NodeList;
+    friend class NodeIterator<Node>;
+    friend class NodeIterator<Node const>;
+};
+
+/// Iterator for editable nodes
+/** Use this class for all operations that require some knowledge about the node's
+ * neighbors. It is a bidirectional iterator.
+ *
+ * Because paths can be cyclic, node iterators have two different ways to
+ * increment and decrement them. When using ++/--, the end iterator will eventually
+ * be returned. When using advance()/retreat(), the end iterator will only be returned
+ * when the path is open. If it's closed, calling advance() will cycle indefinitely.
+ * This is particularly useful for cases where the adjacency of nodes is more important
+ * than their sequence order.
+ *
+ * When @a i is a node iterator, then:
+ * - <code>++i</code> moves the iterator to the next node in sequence order;
+ * - <code>--i</code> moves the iterator to the previous node in sequence order;
+ * - <code>i.next()</code> returns the next node with wrap-around;
+ * - <code>i.prev()</code> returns the previous node with wrap-around;
+ * - <code>i.advance()</code> moves the iterator to the next node with wrap-around;
+ * - <code>i.retreat()</code> moves the iterator to the previous node with wrap-around.
+ *
+ * next() and prev() do not change their iterator. They can return the end iterator
+ * if the path is open.
+ *
+ * Unlike most other iterators, you can check whether you've reached the end of the list
+ * without having access to the iterator's container.
+ * Simply use <code>if (i) { ...</code>
+ * */
+template <typename N>
+class NodeIterator
+    : public boost::bidirectional_iterator_helper<NodeIterator<N>, N, std::ptrdiff_t,
+        N *, N &>
+{
+public:
+    typedef NodeIterator self;
+    NodeIterator()
+        : _node(nullptr)
+    {}
+    // default copy, default assign
+
+    self &operator++() {
+        _node = (_node?_node->ln_next:nullptr);
+        return *this;
+    }
+    self &operator--() {
+        _node = (_node?_node->ln_prev:nullptr);
+        return *this;
+    }
+    bool operator==(self const &other) const { return _node == other._node; }
+    N &operator*() const { return *static_cast<N*>(_node); }
+    inline operator bool() const; // define after NodeList
+    /// Get a pointer to the underlying node. Equivalent to <code>&*i</code>.
+    N *get_pointer() const { return static_cast<N*>(_node); }
+    /// @see get_pointer()
+    N *ptr() const { return static_cast<N*>(_node); }
+
+    self next() const {
+        self r(*this);
+        r.advance();
+        return r;
+    }
+    self prev() const {
+        self r(*this);
+        r.retreat();
+        return r;
+    }
+    self &advance();
+    self &retreat();
+private:
+    NodeIterator(ListNode const *n)
+        : _node(const_cast<ListNode*>(n))
+    {}
+    ListNode *_node;
+    friend class NodeList;
+};
+
+class NodeList : ListNode, boost::noncopyable {
+public:
+    typedef std::size_t size_type;
+    typedef Node &reference;
+    typedef Node const &const_reference;
+    typedef Node *pointer;
+    typedef Node const *const_pointer;
+    typedef Node value_type;
+    typedef NodeIterator<value_type> iterator;
+    typedef NodeIterator<value_type const> const_iterator;
+
+    // TODO Lame. Make this private and make SubpathList a factory
+    /**
+     * An editable list of nodes representing a subpath.
+     *
+     * It can optionally be cyclic to represent a closed path.
+     * The list has iterators that act like plain node iterators, but can also be used
+     * to obtain shared pointers to nodes.
+     */
+    NodeList(SubpathList &_list);
+
+    ~NodeList();
+
+    // no copy or assign
+    NodeList(NodeList const &) = delete;
+    void operator=(NodeList const &) = delete;
+
+    // iterators
+    iterator begin() { return iterator(ln_next); }
+    iterator end() { return iterator(this); }
+    const_iterator begin() const { return const_iterator(ln_next); }
+    const_iterator end() const { return const_iterator(this); }
+
+    // size
+    bool empty();
+    size_type size();
+
+    // extra node-specific methods
+    bool closed();
+
+    /**
+     * A subpath is degenerate if it has no segments - either one node in an open path
+     * or no nodes in a closed path.
+     */
+    bool degenerate();
+
+    void setClosed(bool c) { _closed = c; }
+    iterator before(double t, double *fracpart = nullptr);
+    iterator before(Geom::PathTime const &pvp);
+    const_iterator before(double t, double *fracpart = nullptr) const {
+        return const_cast<NodeList *>(this)->before(t, fracpart)._node;
+    }
+    const_iterator before(Geom::PathTime const &pvp) const {
+        return const_cast<NodeList *>(this)->before(pvp)._node;
+    }
+
+    // list operations
+
+    /** insert a node before pos. */
+    iterator insert(iterator pos, Node *x);
+
+    template <class InputIterator>
+    void insert(iterator pos, InputIterator first, InputIterator last) {
+        for (; first != last; ++first) insert(pos, *first);
+    }
+    void splice(iterator pos, NodeList &list);
+    void splice(iterator pos, NodeList &list, iterator i);
+    void splice(iterator pos, NodeList &list, iterator first, iterator last);
+    void reverse();
+    void shift(int n);
+    void push_front(Node *x) { insert(begin(), x); }
+    void pop_front() { erase(begin()); }
+    void push_back(Node *x) { insert(end(), x); }
+    void pop_back() { erase(--end()); }
+    void clear();
+    iterator erase(iterator pos);
+    iterator erase(iterator first, iterator last) {
+        NodeList::iterator ret = first;
+        while (first != last) ret = erase(first++);
+        return ret;
+    }
+
+    // member access - undefined results when the list is empty
+    Node &front() { return *static_cast<Node*>(ln_next); }
+    Node &back() { return *static_cast<Node*>(ln_prev); }
+
+    // HACK remove this subpath from its path. This will be removed later.
+    void kill();
+    SubpathList &subpathList() { return _list; }
+
+    static iterator get_iterator(Node *n) { return iterator(n); }
+    static const_iterator get_iterator(Node const *n) { return const_iterator(n); }
+    static NodeList &get(Node *n);
+    static NodeList &get(iterator const &i);
+private:
+
+    SubpathList &_list;
+    bool _closed;
+
+    friend class Node;
+    friend class Handle; // required to access handle and handle line groups
+    friend class NodeIterator<Node>;
+    friend class NodeIterator<Node const>;
+};
+
+/**
+ * List of node lists. Represents an editable path.
+ * Editable path composed of one or more subpaths.
+ */
+class SubpathList : public std::list< std::shared_ptr<NodeList> > {
+public:
+    typedef std::list< std::shared_ptr<NodeList> > list_type;
+
+    SubpathList(PathManipulator &pm) : _path_manipulator(pm) {}
+    PathManipulator &pm() { return _path_manipulator; }
+
+private:
+    list_type _nodelists;
+    PathManipulator &_path_manipulator;
+    friend class NodeList;
+    friend class Node;
+    friend class Handle;
+};
+
+
+
+// define inline Handle funcs after definition of Node
+inline Geom::Point Handle::relativePos() const {
+    return position() - _parent->position();
+}
+inline void Handle::setRelativePos(Geom::Point const &p) {
+    setPosition(_parent->position() + p);
+}
+inline double Handle::length() const {
+    return relativePos().length();
+}
+inline PathManipulator &Handle::_pm() {
+    return _parent->_pm();
+}
+inline PathManipulator &Handle::_pm() const {
+    return _parent->_pm();
+}
+inline PathManipulator &Node::_pm() {
+    return nodeList().subpathList().pm();
+}
+
+inline PathManipulator &Node::_pm() const {
+    return nodeList().subpathList().pm();
+}
+
+// definitions for node iterator
+template <typename N>
+NodeIterator<N>::operator bool() const {
+    return _node && static_cast<ListNode*>(_node->ln_list) != _node;
+}
+template <typename N>
+NodeIterator<N> &NodeIterator<N>::advance() {
+    ++(*this);
+    if (G_UNLIKELY(!*this) && _node->ln_list->closed()) ++(*this);
+    return *this;
+}
+template <typename N>
+NodeIterator<N> &NodeIterator<N>::retreat() {
+    --(*this);
+    if (G_UNLIKELY(!*this) && _node->ln_list->closed()) --(*this);
+    return *this;
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/path-manipulator.cpp b/src/ui/tool/path-manipulator.cpp
new file mode 100644
index 0000000..7f30633
--- /dev/null
+++ b/src/ui/tool/path-manipulator.cpp
@@ -0,0 +1,1804 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Path manipulator - implementation.
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/bezier-utils.h>
+#include <2geom/path-sink.h>
+
+#include <utility>
+
+#include "display/curve.h"
+#include "display/control/canvas-item-bpath.h"
+
+#include "helper/geom.h"
+
+#include "live_effects/lpeobject.h"
+#include "live_effects/lpeobject-reference.h"
+#include "live_effects/lpe-powerstroke.h"
+#include "live_effects/lpe-slice.h"
+#include "live_effects/lpe-bspline.h"
+#include "live_effects/parameter/path.h"
+
+#include "object/sp-path.h"
+#include "style.h"
+
+#include "ui/icon-names.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/curve-drag-point.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/multi-path-manipulator.h"
+#include "ui/tool/path-manipulator.h"
+#include "ui/tools/node-tool.h"
+
+#include "xml/node-observer.h"
+
+namespace Inkscape {
+namespace UI {
+
+namespace {
+/// Types of path changes that we must react to.
+enum PathChange {
+    PATH_CHANGE_D,
+    PATH_CHANGE_TRANSFORM
+};
+
+} // anonymous namespace
+const double HANDLE_CUBIC_GAP = 0.001;
+const double NO_POWER = 0.0;
+const double DEFAULT_START_POWER = 1.0/3.0;
+
+
+/**
+ * Notifies the path manipulator when something changes the path being edited
+ * (e.g. undo / redo)
+ */
+class PathManipulatorObserver : public Inkscape::XML::NodeObserver {
+public:
+    PathManipulatorObserver(PathManipulator *p, Inkscape::XML::Node *node)
+        : _pm(p)
+        , _node(node)
+        , _blocked(false)
+    {
+        Inkscape::GC::anchor(_node);
+        _node->addObserver(*this);
+    }
+
+    ~PathManipulatorObserver() override {
+        _node->removeObserver(*this);
+        Inkscape::GC::release(_node);
+    }
+
+    void notifyAttributeChanged(Inkscape::XML::Node &/*node*/, GQuark attr,
+        Util::ptr_shared, Util::ptr_shared) override
+    {
+        // do nothing if blocked
+        if (_blocked) return;
+
+        GQuark path_d = g_quark_from_static_string("d");
+        GQuark path_transform = g_quark_from_static_string("transform");
+        GQuark lpe_quark = _pm->_lpe_key.empty() ? 0 : g_quark_from_string(_pm->_lpe_key.data());
+
+        // only react to "d" (path data) and "transform" attribute changes
+        if (attr == lpe_quark || attr == path_d) {
+            _pm->_externalChange(PATH_CHANGE_D);
+        } else if (attr == path_transform) {
+            _pm->_externalChange(PATH_CHANGE_TRANSFORM);
+        }
+    }
+
+    void block() { _blocked = true; }
+    void unblock() { _blocked = false; }
+private:
+    PathManipulator *_pm;
+    Inkscape::XML::Node *_node;
+    bool _blocked;
+};
+
+void build_segment(Geom::PathBuilder &, Node *, Node *);
+PathManipulator::PathManipulator(MultiPathManipulator &mpm, SPObject *path,
+        Geom::Affine const &et, guint32 outline_color, Glib::ustring lpe_key)
+    : PointManipulator(mpm._path_data.node_data.desktop, *mpm._path_data.node_data.selection)
+    , _subpaths(*this)
+    , _multi_path_manipulator(mpm)
+    , _path(path)
+    , _spcurve(new SPCurve())
+    , _dragpoint(new CurveDragPoint(*this))
+    , /* XML Tree being used here directly while it shouldn't be*/_observer(new PathManipulatorObserver(this, path->getRepr()))
+    , _edit_transform(et)
+    , _lpe_key(std::move(lpe_key))
+{
+    LivePathEffectObject *lpeobj = dynamic_cast<LivePathEffectObject *>(_path);
+    SPPath *pathshadow = dynamic_cast<SPPath *>(_path);
+    if (!lpeobj) {
+        _i2d_transform = pathshadow->i2dt_affine();
+    } else {
+        _i2d_transform = Geom::identity();
+    }
+    _d2i_transform = _i2d_transform.inverse();
+    _dragpoint->setVisible(false);
+
+    _getGeometry();
+
+    _outline = new Inkscape::CanvasItemBpath(_multi_path_manipulator._path_data.outline_group);
+    _outline->hide();
+    _outline->set_stroke(outline_color);
+    _outline->set_fill(0x0, SP_WIND_RULE_NONZERO);
+
+    _selection.signal_update.connect(
+        sigc::bind(sigc::mem_fun(*this, &PathManipulator::update), false));
+    _selection.signal_selection_changed.connect(
+        sigc::mem_fun(*this, &PathManipulator::_selectionChangedM));
+    _desktop->signal_zoom_changed.connect(
+        sigc::hide( sigc::mem_fun(*this, &PathManipulator::_updateOutlineOnZoomChange)));
+
+    _createControlPointsFromGeometry();
+    //Define if the path is BSpline on construction
+    _recalculateIsBSpline();
+}
+
+PathManipulator::~PathManipulator()
+{
+    delete _dragpoint;
+    delete _observer;
+    delete _outline;
+    clear();
+}
+
+/** Handle motion events to update the position of the curve drag point. */
+bool PathManipulator::event(Inkscape::UI::Tools::ToolBase * /*event_context*/, GdkEvent *event)
+{
+    if (empty()) return false;
+
+    switch (event->type)
+    {
+    case GDK_MOTION_NOTIFY:
+        _updateDragPoint(event_point(event->motion));
+        break;
+    default:
+        break;
+    }
+    return false;
+}
+
+/** Check whether the manipulator has any nodes. */
+bool PathManipulator::empty() {
+    return !_path || _subpaths.empty();
+}
+
+/** Update the display and the outline of the path.
+ * \param alert_LPE if true, alerts an applied LPE to what the path is going to be changed to, so it can adjust its parameters for nicer user interfacing
+ */
+void PathManipulator::update(bool alert_LPE)
+{
+    _createGeometryFromControlPoints(alert_LPE);
+}
+
+/** Store the changes to the path in XML. */
+void PathManipulator::writeXML()
+{
+    if (!_live_outline)
+        _updateOutline();
+
+    _setGeometry();
+    if (!_path) {
+        return;
+    }
+
+    XML::Node *node = _getXMLNode();
+    if (!node) {
+        return;
+    }
+
+    _observer->block();
+    if (!empty()) {
+        _path->updateRepr();
+        node->setAttribute(_nodetypesKey(), _createTypeString());
+    } else {
+        // this manipulator will have to be destroyed right after this call
+        node->removeObserver(*_observer);
+        _path->deleteObject(true, true);
+        _path = nullptr;
+    }
+    _observer->unblock();
+}
+
+/** Remove all nodes from the path. */
+void PathManipulator::clear()
+{
+    // no longer necessary since nodes remove themselves from selection on destruction
+    //_removeNodesFromSelection();
+    _subpaths.clear();
+}
+
+/** Select all nodes in subpaths that have something selected. */
+void PathManipulator::selectSubpaths()
+{
+    for (auto & _subpath : _subpaths) {
+        NodeList::iterator sp_start = _subpath->begin(), sp_end = _subpath->end();
+        for (NodeList::iterator j = sp_start; j != sp_end; ++j) {
+            if (j->selected()) {
+                // if at least one of the nodes from this subpath is selected,
+                // select all nodes from this subpath
+                for (NodeList::iterator ins = sp_start; ins != sp_end; ++ins)
+                    _selection.insert(ins.ptr());
+                continue;
+            }
+        }
+    }
+}
+
+/** Invert selection in the selected subpaths. */
+void PathManipulator::invertSelectionInSubpaths()
+{
+    for (auto & _subpath : _subpaths) {
+        for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+            if (j->selected()) {
+                // found selected node - invert selection in this subpath
+                for (NodeList::iterator k = _subpath->begin(); k != _subpath->end(); ++k) {
+                    if (k->selected()) _selection.erase(k.ptr());
+                    else _selection.insert(k.ptr());
+                }
+                // next subpath
+                break;
+            }
+        }
+    }
+}
+
+/** Insert a new node in the middle of each selected segment. */
+void PathManipulator::insertNodes()
+{
+    if (_selection.size() < 2) return;
+
+    for (auto & _subpath : _subpaths) {
+        for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+            NodeList::iterator k = j.next();
+            if (k && j->selected() && k->selected()) {
+                j = subdivideSegment(j, 0.5);
+                _selection.insert(j.ptr());
+            }
+        }
+    }
+}
+
+void PathManipulator::insertNode(Geom::Point pt)
+{
+    Geom::Coord dist = _updateDragPoint(pt);
+    if (dist < 1e-5) { // 1e-6 is too small, as observed occasionally when inserting a node at a snapped intersection of paths
+        insertNode(_dragpoint->getIterator(), _dragpoint->getTimeValue(), true);
+    }
+}
+
+void PathManipulator::insertNode(NodeList::iterator first, double t, bool take_selection)
+{
+    NodeList::iterator inserted = subdivideSegment(first, t);
+    if (take_selection) {
+        _selection.clear();
+    }
+    _selection.insert(inserted.ptr());
+
+    update(true);
+    _commit(_("Add node"));
+}
+
+
+static void
+add_or_replace_if_extremum(std::vector< std::pair<NodeList::iterator, double> > &vec,
+                           double & extrvalue, double testvalue, NodeList::iterator const& node, double t)
+{
+    if (testvalue > extrvalue) {
+        // replace all extreme nodes with the new one
+        vec.clear();
+        vec.emplace_back( node, t );
+        extrvalue = testvalue;
+    } else if ( Geom::are_near(testvalue, extrvalue) ) {
+        // very rare but: extremum node at the same extreme value!!! so add it to the list
+        vec.emplace_back( node, t );
+    }
+}
+
+/** Insert a new node at the extremum of the selected segments. */
+void PathManipulator::insertNodeAtExtremum(ExtremumType extremum)
+{
+    if (_selection.size() < 2) return;
+
+    double sign    = (extremum == EXTR_MIN_X || extremum == EXTR_MIN_Y) ? -1. : 1.;
+    Geom::Dim2 dim = (extremum == EXTR_MIN_X || extremum == EXTR_MAX_X) ? Geom::X : Geom::Y;
+
+    for (auto & _subpath : _subpaths) {
+        Geom::Coord extrvalue = - Geom::infinity();
+        std::vector< std::pair<NodeList::iterator, double> > extremum_vector;
+
+        for (NodeList::iterator first = _subpath->begin(); first != _subpath->end(); ++first) {
+            NodeList::iterator second = first.next();
+            if (second && first->selected() && second->selected()) {
+                add_or_replace_if_extremum(extremum_vector, extrvalue, sign * first->position()[dim], first, 0.);
+                add_or_replace_if_extremum(extremum_vector, extrvalue, sign * second->position()[dim], first, 1.);
+                if (first->front()->isDegenerate() && second->back()->isDegenerate()) {
+                    // a line segment has is extrema at the start and end, no node should be added
+                    continue;
+                } else {
+                    // build 1D cubic bezier curve
+                    Geom::Bezier temp1d(first->position()[dim], first->front()->position()[dim],
+                                        second->back()->position()[dim], second->position()[dim]);
+                    // and determine extremum
+                    Geom::Bezier deriv1d = derivative(temp1d);
+                    std::vector<double> rs = deriv1d.roots();
+                    for (double & r : rs) {
+                        add_or_replace_if_extremum(extremum_vector, extrvalue, sign * temp1d.valueAt(r), first, r);
+                    }
+                }
+            }
+        }
+
+        for (auto & i : extremum_vector) {
+            // don't insert node at the start or end of a segment, i.e. round values for extr_t
+            double t = i.second;
+            if ( !Geom::are_near(t - std::floor(t+0.5),0.) )  //  std::floor(t+0.5) is another way of writing round(t)
+            {
+                _selection.insert( subdivideSegment(i.first, t).ptr() );
+            }
+        }
+    }
+}
+
+
+/** Insert new nodes exactly at the positions of selected nodes while preserving shape.
+ * This is equivalent to breaking, except that it doesn't split into subpaths. */
+void PathManipulator::duplicateNodes()
+{
+    if (_selection.empty()) return;
+
+    for (auto & _subpath : _subpaths) {
+        for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+            if (j->selected()) {
+                NodeList::iterator k = j.next();
+                Node *n = new Node(_multi_path_manipulator._path_data.node_data, *j);
+
+                if (k) {
+                    // Move the new node to the bottom of the Z-order. This way you can drag all
+                    // nodes that were selected before this operation without deselecting
+                    // everything because there is a new node above.
+                    n->sink();
+                }
+
+                n->front()->setPosition(*j->front());
+                j->front()->retract();
+                j->setType(NODE_CUSP, false);
+                _subpath->insert(k, n);
+
+                if (k) {
+                    // We need to manually call the selection change callback to refresh
+                    // the handle display correctly.
+                    // This call changes num_selected, but we call this once for a selected node
+                    // and once for an unselected node, so in the end the number stays correct.
+                    _selectionChanged(j.ptr(), true);
+                    _selectionChanged(n, false);
+                } else {
+                    // select the new end node instead of the node just before it
+                    _selection.erase(j.ptr());
+                    _selection.insert(n);
+                    break; // this was the end node, nothing more to do
+                }
+            }
+        }
+    }
+}
+
+/**
+  * Copy the selected nodes using the PathBuilder
+  *
+  * @param builder[out] Selected nodes will be appended to this Path builder
+  *                     in pixel coordinates with all transforms applied.
+  */
+void PathManipulator::copySelectedPath(Geom::PathBuilder *builder)
+{
+    // Ignore LivePathEffect paths
+    if (!_path || dynamic_cast<LivePathEffectObject *>(_path))
+        return;
+    // Rebuild the selected parts of each subpath
+    for (auto &subpath : _subpaths) {
+        Node *prev = nullptr;
+        bool is_last_node = false;
+        for (auto &node : *subpath) {
+            if (node.selected()) {
+                // The node positions are already transformed
+                if (!builder->inPath() || !prev) {
+                    builder->moveTo(node.position());
+                } else {
+                    build_segment(*builder, prev, &node);
+                }
+                prev = &node;
+                is_last_node = true;
+            } else {
+                is_last_node = false;
+            }
+        }
+
+        // Complete the path, especially for closed sub paths where the last node is selected
+        if (subpath->closed() && is_last_node) {
+            if (!prev->front()->isDegenerate() || !subpath->begin()->back()->isDegenerate())   {
+                build_segment(*builder, prev, subpath->begin().ptr());
+            }
+            // if that segment is linear, we just call closePath().
+            builder->closePath();
+        }
+    }
+    builder->flush();
+}
+
+/** Replace contiguous selections of nodes in each subpath with one node. */
+void PathManipulator::weldNodes(NodeList::iterator preserve_pos)
+{
+    if (_selection.size() < 2) return;
+    hideDragPoint();
+
+    bool pos_valid = preserve_pos;
+    for (auto sp : _subpaths) {
+        unsigned num_selected = 0, num_unselected = 0;
+        for (auto & j : *sp) {
+            if (j.selected()) ++num_selected;
+            else ++num_unselected;
+        }
+        if (num_selected < 2) continue;
+        if (num_unselected == 0) {
+            // if all nodes in a subpath are selected, the operation doesn't make much sense
+            continue;
+        }
+
+        // Start from unselected node in closed paths, so that we don't start in the middle
+        // of a selection
+        NodeList::iterator sel_beg = sp->begin(), sel_end;
+        if (sp->closed()) {
+            while (sel_beg->selected()) ++sel_beg;
+        }
+
+        // Work loop
+        while (num_selected > 0) {
+            // Find selected node
+            while (sel_beg && !sel_beg->selected()) sel_beg = sel_beg.next();
+            if (!sel_beg) throw std::logic_error("Join nodes: end of open path reached, "
+                "but there are still nodes to process!");
+
+            // note: this is initialized to zero, because the loop below counts sel_beg as well
+            // the loop conditions are simpler that way
+            unsigned num_points = 0;
+            bool use_pos = false;
+            Geom::Point back_pos, front_pos;
+            back_pos = *sel_beg->back();
+
+            for (sel_end = sel_beg; sel_end && sel_end->selected(); sel_end = sel_end.next()) {
+                ++num_points;
+                front_pos = *sel_end->front();
+                if (pos_valid && sel_end == preserve_pos) use_pos = true;
+            }
+            if (num_points > 1) {
+                Geom::Point joined_pos;
+                if (use_pos) {
+                    joined_pos = preserve_pos->position();
+                    pos_valid = false;
+                } else {
+                    joined_pos = Geom::middle_point(back_pos, front_pos);
+                }
+                sel_beg->setType(NODE_CUSP, false);
+                sel_beg->move(joined_pos);
+                // do not move handles if they aren't degenerate
+                if (!sel_beg->back()->isDegenerate()) {
+                    sel_beg->back()->setPosition(back_pos);
+                }
+                if (!sel_end.prev()->front()->isDegenerate()) {
+                    sel_beg->front()->setPosition(front_pos);
+                }
+                sel_beg = sel_beg.next();
+                while (sel_beg != sel_end) {
+                    NodeList::iterator next = sel_beg.next();
+                    sp->erase(sel_beg);
+                    sel_beg = next;
+                    --num_selected;
+                }
+            }
+            --num_selected; // for the joined node or single selected node
+        }
+    }
+}
+
+/** Remove nodes in the middle of selected segments. */
+void PathManipulator::weldSegments()
+{
+    if (_selection.size() < 2) return;
+    hideDragPoint();
+
+    for (auto sp : _subpaths) {
+        unsigned num_selected = 0, num_unselected = 0;
+        for (auto & j : *sp) {
+            if (j.selected()) ++num_selected;
+            else ++num_unselected;
+        }
+
+        // if 2 or fewer nodes are selected, there can't be any middle points to remove.
+        if (num_selected <= 2) continue;
+
+        if (num_unselected == 0 && sp->closed()) {
+            // if all nodes in a closed subpath are selected, the operation doesn't make much sense
+            continue;
+        }
+
+        // Start from unselected node in closed paths, so that we don't start in the middle
+        // of a selection
+        NodeList::iterator sel_beg = sp->begin(), sel_end;
+        if (sp->closed()) {
+            while (sel_beg->selected()) ++sel_beg;
+        }
+
+        // Work loop
+        while (num_selected > 0) {
+            // Find selected node
+            while (sel_beg && !sel_beg->selected()) sel_beg = sel_beg.next();
+            if (!sel_beg) throw std::logic_error("Join nodes: end of open path reached, "
+                "but there are still nodes to process!");
+
+            // note: this is initialized to zero, because the loop below counts sel_beg as well
+            // the loop conditions are simpler that way
+            unsigned num_points = 0;
+
+            // find the end of selected segment
+            for (sel_end = sel_beg; sel_end && sel_end->selected(); sel_end = sel_end.next()) {
+                ++num_points;
+            }
+            if (num_points > 2) {
+                // remove nodes in the middle
+                // TODO: fit bezier to the former shape
+                sel_beg = sel_beg.next();
+                while (sel_beg != sel_end.prev()) {
+                    NodeList::iterator next = sel_beg.next();
+                    sp->erase(sel_beg);
+                    sel_beg = next;
+                }
+            }
+            sel_beg = sel_end;
+            // decrease num_selected by the number of points processed
+            num_selected -= num_points;
+        }
+    }
+}
+
+/** Break the subpath at selected nodes. It also works for single node closed paths. */
+void PathManipulator::breakNodes()
+{
+    for (SubpathList::iterator i = _subpaths.begin(); i != _subpaths.end(); ++i) {
+        SubpathPtr sp = *i;
+        NodeList::iterator cur = sp->begin(), end = sp->end();
+        if (!sp->closed()) {
+            // Each open path must have at least two nodes so no checks are required.
+            // For 2-node open paths, cur == end
+            ++cur;
+            --end;
+        }
+        for (; cur != end; ++cur) {
+            if (!cur->selected()) continue;
+            SubpathPtr ins;
+            bool becomes_open = false;
+
+            if (sp->closed()) {
+                // Move the node to break at to the beginning of path
+                if (cur != sp->begin())
+                    sp->splice(sp->begin(), *sp, cur, sp->end());
+                sp->setClosed(false);
+                ins = sp;
+                becomes_open = true;
+            } else {
+                SubpathPtr new_sp(new NodeList(_subpaths));
+                new_sp->splice(new_sp->end(), *sp, sp->begin(), cur);
+                _subpaths.insert(i, new_sp);
+                ins = new_sp;
+            }
+
+            Node *n = new Node(_multi_path_manipulator._path_data.node_data, cur->position());
+            ins->insert(ins->end(), n);
+            cur->setType(NODE_CUSP, false);
+            n->back()->setRelativePos(cur->back()->relativePos());
+            cur->back()->retract();
+            n->sink();
+
+            if (becomes_open) {
+                cur = sp->begin(); // this will be increased to ++sp->begin()
+                end = --sp->end();
+            }
+        }
+    }
+}
+
+/** Delete selected nodes in the path, optionally substituting deleted segments with bezier curves
+ * in a way that attempts to preserve the original shape of the curve. */
+void PathManipulator::deleteNodes(bool keep_shape)
+{
+    if (_selection.empty()) return;
+    hideDragPoint();
+
+    for (SubpathList::iterator i = _subpaths.begin(); i != _subpaths.end();) {
+        SubpathPtr sp = *i;
+
+        // If there are less than 2 unselected nodes in an open subpath or no unselected nodes
+        // in a closed one, delete entire subpath.
+        unsigned num_unselected = 0, num_selected = 0;
+        for (auto & j : *sp) {
+            if (j.selected()) ++num_selected;
+            else ++num_unselected;
+        }
+        if (num_selected == 0) {
+            ++i;
+            continue;
+        }
+        if (sp->closed() ? (num_unselected < 1) : (num_unselected < 2)) {
+            _subpaths.erase(i++);
+            continue;
+        }
+
+        // In closed paths, start from an unselected node - otherwise we might start in the middle
+        // of a selected stretch and the resulting bezier fit would be suboptimal
+        NodeList::iterator sel_beg = sp->begin(), sel_end;
+        if (sp->closed()) {
+            while (sel_beg->selected()) ++sel_beg;
+        }
+        sel_end = sel_beg;
+        
+        while (num_selected > 0) {
+            while (sel_beg && !sel_beg->selected()) {
+                sel_beg = sel_beg.next();
+            }
+            sel_end = sel_beg;
+
+            while (sel_end && sel_end->selected()) {
+                sel_end = sel_end.next();
+            }
+            
+            num_selected -= _deleteStretch(sel_beg, sel_end, keep_shape);
+            sel_beg = sel_end;
+        }
+        ++i;
+    }
+}
+
+/**
+ * Delete nodes between the two iterators.
+ * The given range can cross the beginning of the subpath in closed subpaths.
+ * @param start      Beginning of the range to delete
+ * @param end        End of the range
+ * @param keep_shape Whether to fit the handles at surrounding nodes to approximate
+ *                   the shape before deletion
+ * @return Number of deleted nodes
+ */
+unsigned PathManipulator::_deleteStretch(NodeList::iterator start, NodeList::iterator end, bool keep_shape)
+{
+    unsigned const samples_per_segment = 10;
+    double const t_step = 1.0 / samples_per_segment;
+
+    unsigned del_len = 0;
+    for (NodeList::iterator i = start; i != end; i = i.next()) {
+        ++del_len;
+    }
+    if (del_len == 0) return 0;
+
+    // set surrounding node types to cusp if:
+    // 1. keep_shape is on, or
+    // 2. we are deleting at the end or beginning of an open path
+    if ((keep_shape || !end) && start.prev()) start.prev()->setType(NODE_CUSP, false);
+    if ((keep_shape || !start.prev()) && end) end->setType(NODE_CUSP, false);
+
+    if (keep_shape && start.prev() && end) {
+        unsigned num_samples = (del_len + 1) * samples_per_segment + 1;
+        Geom::Point *bezier_data = new Geom::Point[num_samples];
+        Geom::Point result[4];
+        unsigned seg = 0;
+
+        for (NodeList::iterator cur = start.prev(); cur != end; cur = cur.next()) {
+            Geom::CubicBezier bc(*cur, *cur->front(), *cur.next(), *cur.next()->back());
+            for (unsigned s = 0; s < samples_per_segment; ++s) {
+                bezier_data[seg * samples_per_segment + s] = bc.pointAt(t_step * s);
+            }
+            ++seg;
+        }
+        // Fill last point
+        bezier_data[num_samples - 1] = end->position();
+        // Compute replacement bezier curve
+        // TODO the fitting algorithm sucks - rewrite it to be awesome
+        bezier_fit_cubic(result, bezier_data, num_samples, 0.5);
+        delete[] bezier_data;
+
+        start.prev()->front()->setPosition(result[1]);
+        end->back()->setPosition(result[2]);
+    }
+
+    // We can't use nl->erase(start, end), because it would break when the stretch
+    // crosses the beginning of a closed subpath
+    NodeList &nl = start->nodeList();
+    while (start != end) {
+        NodeList::iterator next = start.next();
+        nl.erase(start);
+        start = next;
+    }
+    // if we are removing, we readjust the handlers
+    if(_isBSpline()){
+        if(start.prev()){
+            double bspline_weight = _bsplineHandlePosition(start.prev()->back(), false);
+            start.prev()->front()->setPosition(_bsplineHandleReposition(start.prev()->front(), bspline_weight));
+        }
+        if(end){
+            double bspline_weight = _bsplineHandlePosition(end->front(), false);
+            end->back()->setPosition(_bsplineHandleReposition(end->back(),bspline_weight));
+        }
+    }
+
+    return del_len;
+}
+
+/** Removes selected segments */
+void PathManipulator::deleteSegments()
+{
+    if (_selection.empty()) return;
+    hideDragPoint();
+
+    for (SubpathList::iterator i = _subpaths.begin(); i != _subpaths.end();) {
+        SubpathPtr sp = *i;
+        bool has_unselected = false;
+        unsigned num_selected = 0;
+        for (auto & j : *sp) {
+            if (j.selected()) {
+                ++num_selected;
+            } else {
+                has_unselected = true;
+            }
+        }
+        if (!has_unselected) {
+            _subpaths.erase(i++);
+            continue;
+        }
+
+        NodeList::iterator sel_beg = sp->begin();
+        if (sp->closed()) {
+            while (sel_beg && sel_beg->selected()) ++sel_beg;
+        }
+        while (num_selected > 0) {
+            if (!sel_beg->selected()) {
+                sel_beg = sel_beg.next();
+                continue;
+            }
+            NodeList::iterator sel_end = sel_beg;
+            unsigned num_points = 0;
+            while (sel_end && sel_end->selected()) {
+                sel_end = sel_end.next();
+                ++num_points;
+            }
+            if (num_points >= 2) {
+                // Retract end handles
+                sel_end.prev()->setType(NODE_CUSP, false);
+                sel_end.prev()->back()->retract();
+                sel_beg->setType(NODE_CUSP, false);
+                sel_beg->front()->retract();
+                if (sp->closed()) {
+                    // In closed paths, relocate the beginning of the path to the last selected
+                    // node and then unclose it. Remove the nodes from the first selected node
+                    // to the new end of path.
+                    if (sel_end.prev() != sp->begin())
+                        sp->splice(sp->begin(), *sp, sel_end.prev(), sp->end());
+                    sp->setClosed(false);
+                    sp->erase(sel_beg.next(), sp->end());
+                } else {
+                    // for open paths:
+                    // 1. At end or beginning, delete including the node on the end or beginning
+                    // 2. In the middle, delete only inner nodes
+                    if (sel_beg == sp->begin()) {
+                        sp->erase(sp->begin(), sel_end.prev());
+                    } else if (sel_end == sp->end()) {
+                        sp->erase(sel_beg.next(), sp->end());
+                    } else {
+                        SubpathPtr new_sp(new NodeList(_subpaths));
+                        new_sp->splice(new_sp->end(), *sp, sp->begin(), sel_beg.next());
+                        _subpaths.insert(i, new_sp);
+                        if (sel_end.prev())
+                            sp->erase(sp->begin(), sel_end.prev());
+                    }
+                }
+            }
+            sel_beg = sel_end;
+            num_selected -= num_points;
+        }
+        ++i;
+    }
+}
+
+/** Reverse subpaths of the path.
+ * @param selected_only If true, only paths that have at least one selected node
+ *                      will be reversed. Otherwise all subpaths will be reversed. */
+void PathManipulator::reverseSubpaths(bool selected_only)
+{
+    for (auto & _subpath : _subpaths) {
+        if (selected_only) {
+            for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+                if (j->selected()) {
+                    _subpath->reverse();
+                    break; // continue with the next subpath
+                }
+            }
+        } else {
+            _subpath->reverse();
+        }
+    }
+}
+
+/** Make selected segments curves / lines. */
+void PathManipulator::setSegmentType(SegmentType type)
+{
+    if (_selection.empty()) return;
+    for (auto & _subpath : _subpaths) {
+        for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+            NodeList::iterator k = j.next();
+            if (!(k && j->selected() && k->selected())) continue;
+            switch (type) {
+            case SEGMENT_STRAIGHT:
+                if (j->front()->isDegenerate() && k->back()->isDegenerate())
+                    break;
+                j->front()->move(*j);
+                k->back()->move(*k);
+                break;
+            case SEGMENT_CUBIC_BEZIER:
+                if (!j->front()->isDegenerate() || !k->back()->isDegenerate())
+                    break;
+                // move both handles to 1/3 of the line
+                j->front()->move(j->position() + (k->position() - j->position()) / 3);
+                k->back()->move(k->position() + (j->position() - k->position()) / 3);
+                break;
+            }
+        }
+    }
+}
+
+void PathManipulator::scaleHandle(Node *n, int which, int dir, bool pixel)
+{
+    if (n->type() == NODE_SYMMETRIC || n->type() == NODE_AUTO) {
+        n->setType(NODE_SMOOTH);
+    }
+    Handle *h = _chooseHandle(n, which);
+    double length_change;
+
+    if (pixel) {
+        length_change = 1.0 / _desktop->current_zoom() * dir;
+    } else {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        length_change = prefs->getDoubleLimited("/options/defaultscale/value", 2, 1, 1000, "px");
+        length_change *= dir;
+    }
+
+    Geom::Point relpos;
+    if (h->isDegenerate()) {
+        if (dir < 0) return;
+        Node *nh = n->nodeToward(h);
+        if (!nh) return;
+        relpos = Geom::unit_vector(nh->position() - n->position()) * length_change;
+    } else {
+        relpos = h->relativePos();
+        double rellen = relpos.length();
+        relpos *= ((rellen + length_change) / rellen);
+    }
+    h->setRelativePos(relpos);
+    update();
+    gchar const *key = which < 0 ? "handle:scale:left" : "handle:scale:right";
+    _commit(_("Scale handle"), key);
+}
+
+void PathManipulator::rotateHandle(Node *n, int which, int dir, bool pixel)
+{
+    if (n->type() != NODE_CUSP) {
+        n->setType(NODE_CUSP);
+    }
+    Handle *h = _chooseHandle(n, which);
+    if (h->isDegenerate()) return;
+
+    double angle;
+    if (pixel) {
+        // Rotate by "one pixel"
+        angle = atan2(1.0 / _desktop->current_zoom(), h->length()) * dir;
+    } else {
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        int snaps = prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+        angle = M_PI * dir / snaps;
+    }
+
+    h->setRelativePos(h->relativePos() * Geom::Rotate(angle));
+    update();
+    gchar const *key = which < 0 ? "handle:rotate:left" : "handle:rotate:right";
+    _commit(_("Rotate handle"), key);
+}
+
+Handle *PathManipulator::_chooseHandle(Node *n, int which)
+{
+    NodeList::iterator i = NodeList::get_iterator(n);
+    Node *prev = i.prev().ptr();
+    Node *next = i.next().ptr();
+
+    // on an endnode, the remaining handle automatically wins
+    if (!next) return n->back();
+    if (!prev) return n->front();
+
+    // compare X coord offline segments
+    Geom::Point npos = next->position();
+    Geom::Point ppos = prev->position();
+    if (which < 0) {
+        // pick left handle.
+        // we just swap the handles and pick the right handle below.
+        std::swap(npos, ppos);
+    }
+
+    if (npos[Geom::X] >= ppos[Geom::X]) {
+        return n->front();
+    } else {
+        return n->back();
+    }
+}
+
+/** Set the visibility of handles. */
+void PathManipulator::showHandles(bool show)
+{
+    if (show == _show_handles) return;
+    if (show) {
+        for (auto & _subpath : _subpaths) {
+            for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+                if (!j->selected()) continue;
+                j->showHandles(true);
+                if (j.prev()) j.prev()->showHandles(true);
+                if (j.next()) j.next()->showHandles(true);
+            }
+        }
+    } else {
+        for (auto & _subpath : _subpaths) {
+            for (auto & j : *_subpath) {
+                j.showHandles(false);
+            }
+        }
+    }
+    _show_handles = show;
+}
+
+/** Set the visibility of outline. */
+void PathManipulator::showOutline(bool show)
+{
+    if (show == _show_outline) return;
+    _show_outline = show;
+    _updateOutline();
+}
+
+void PathManipulator::showPathDirection(bool show)
+{
+    if (show == _show_path_direction) return;
+    _show_path_direction = show;
+    _updateOutline();
+}
+
+void PathManipulator::setLiveOutline(bool set)
+{
+    _live_outline = set;
+}
+
+void PathManipulator::setLiveObjects(bool set)
+{
+    _live_objects = set;
+}
+
+void PathManipulator::updateHandles()
+{
+    for (auto & _subpath : _subpaths) {
+        for (auto & j : *_subpath) {
+            j.updateHandles();
+        }
+    }
+}
+
+void PathManipulator::setControlsTransform(Geom::Affine const &tnew)
+{
+    Geom::Affine delta = _i2d_transform.inverse() * _edit_transform.inverse() * tnew * _i2d_transform;
+    _edit_transform = tnew;
+    for (auto & _subpath : _subpaths) {
+        for (auto & j : *_subpath) {
+            j.transform(delta);
+        }
+    }
+    _createGeometryFromControlPoints();
+}
+
+/** Hide the curve drag point until the next motion event.
+ * This should be called at the beginning of every method that can delete nodes.
+ * Otherwise the invalidated iterator in the dragpoint can cause crashes. */
+void PathManipulator::hideDragPoint()
+{
+    _dragpoint->setVisible(false);
+    _dragpoint->setIterator(NodeList::iterator());
+}
+
+/** Insert a node in the segment beginning with the supplied iterator,
+ * at the given time value */
+NodeList::iterator PathManipulator::subdivideSegment(NodeList::iterator first, double t)
+{
+    if (!first) throw std::invalid_argument("Subdivide after invalid iterator");
+    NodeList &list = NodeList::get(first);
+    NodeList::iterator second = first.next();
+    if (!second) throw std::invalid_argument("Subdivide after last node in open path");
+    if (first->type() == NODE_SYMMETRIC)
+        first->setType(NODE_SMOOTH, false);
+    if (second->type() == NODE_SYMMETRIC)
+        second->setType(NODE_SMOOTH, false);
+
+    // We need to insert the segment after 'first'. We can't simply use 'second'
+    // as the point of insertion, because when 'first' is the last node of closed path,
+    // the new node will be inserted as the first node instead.
+    NodeList::iterator insert_at = first;
+    ++insert_at;
+
+    NodeList::iterator inserted;
+    if (first->front()->isDegenerate() && second->back()->isDegenerate()) {
+        // for a line segment, insert a cusp node
+        Node *n = new Node(_multi_path_manipulator._path_data.node_data,
+            Geom::lerp(t, first->position(), second->position()));
+        n->setType(NODE_CUSP, false);
+        inserted = list.insert(insert_at, n);
+    } else {
+        // build bezier curve and subdivide
+        Geom::CubicBezier temp(first->position(), first->front()->position(),
+            second->back()->position(), second->position());
+        std::pair<Geom::CubicBezier, Geom::CubicBezier> div = temp.subdivide(t);
+        std::vector<Geom::Point> seg1 = div.first.controlPoints(), seg2 = div.second.controlPoints();
+
+        // set new handle positions
+        Node *n = new Node(_multi_path_manipulator._path_data.node_data, seg2[0]);
+        if(!_isBSpline()){
+            n->back()->setPosition(seg1[2]);
+            n->front()->setPosition(seg2[1]);
+            n->setType(NODE_SMOOTH, false);
+        } else {
+            Geom::D2< Geom::SBasis > sbasis_inside_nodes;
+            std::unique_ptr<SPCurve> line_inside_nodes(new SPCurve());
+            if(second->back()->isDegenerate()){
+                line_inside_nodes->moveto(n->position());
+                line_inside_nodes->lineto(second->position());
+                sbasis_inside_nodes = line_inside_nodes->first_segment()->toSBasis();
+                Geom::Point next = sbasis_inside_nodes.valueAt(DEFAULT_START_POWER);
+                next = Geom::Point(next[Geom::X] + HANDLE_CUBIC_GAP,next[Geom::Y] + HANDLE_CUBIC_GAP);
+                line_inside_nodes->reset();
+                n->front()->setPosition(next);
+            }else{
+                n->front()->setPosition(seg2[1]);
+            }
+            if(first->front()->isDegenerate()){
+                line_inside_nodes->moveto(n->position());
+                line_inside_nodes->lineto(first->position());
+                sbasis_inside_nodes = line_inside_nodes->first_segment()->toSBasis();
+                Geom::Point previous = sbasis_inside_nodes.valueAt(DEFAULT_START_POWER);
+                previous = Geom::Point(previous[Geom::X] + HANDLE_CUBIC_GAP,previous[Geom::Y] + HANDLE_CUBIC_GAP);
+                n->back()->setPosition(previous);
+            }else{
+                n->back()->setPosition(seg1[2]);
+            }
+            n->setType(NODE_CUSP, false);
+        }
+        inserted = list.insert(insert_at, n);
+
+        first->front()->move(seg1[1]);
+        second->back()->move(seg2[2]);
+    }
+    return inserted;
+}
+
+/** Find the node that is closest/farthest from the origin
+ * @param origin Point of reference
+ * @param search_selected Consider selected nodes
+ * @param search_unselected Consider unselected nodes
+ * @param closest If true, return closest node, if false, return farthest
+ * @return The matching node, or an empty iterator if none found
+ */
+NodeList::iterator PathManipulator::extremeNode(NodeList::iterator origin, bool search_selected,
+    bool search_unselected, bool closest)
+{
+    NodeList::iterator match;
+    double extr_dist = closest ? HUGE_VAL : -HUGE_VAL;
+    if (_selection.empty() && !search_unselected) return match;
+
+    for (auto & _subpath : _subpaths) {
+        for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+            if(j->selected()) {
+                if (!search_selected) continue;
+            } else {
+                if (!search_unselected) continue;
+            }
+            double dist = Geom::distance(*j, *origin);
+            bool cond = closest ? (dist < extr_dist) : (dist > extr_dist);
+            if (cond) {
+                match = j;
+                extr_dist = dist;
+            }
+        }
+    }
+    return match;
+}
+
+/* Called when a process updates the path in-situe */
+void PathManipulator::updatePath()
+{
+    _externalChange(PATH_CHANGE_D);
+}
+
+/** Called by the XML observer when something else than us modifies the path. */
+void PathManipulator::_externalChange(unsigned type)
+{
+    hideDragPoint();
+
+    switch (type) {
+    case PATH_CHANGE_D: {
+        _getGeometry();
+
+        // ugly: stored offsets of selected nodes in a vector
+        // vector<bool> should be specialized so that it takes only 1 bit per value
+        std::vector<bool> selpos;
+        for (auto & _subpath : _subpaths) {
+            for (auto & j : *_subpath) {
+                selpos.push_back(j.selected());
+            }
+        }
+        unsigned size = selpos.size(), curpos = 0;
+
+        _createControlPointsFromGeometry();
+
+        for (auto & _subpath : _subpaths) {
+            for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+                if (curpos >= size) goto end_restore;
+                if (selpos[curpos]) _selection.insert(j.ptr());
+                ++curpos;
+            }
+        }
+        end_restore:
+
+        _updateOutline();
+        } break;
+    case PATH_CHANGE_TRANSFORM: {
+        SPPath *path = dynamic_cast<SPPath *>(_path);
+        if (path) {
+            Geom::Affine i2d_change = _d2i_transform;
+            _i2d_transform = path->i2dt_affine();
+            _d2i_transform = _i2d_transform.inverse();
+            i2d_change *= _i2d_transform;
+            for (auto & _subpath : _subpaths) {
+                for (auto & j : *_subpath) {
+                    j.transform(i2d_change);
+                }
+            }
+            _updateOutline();
+        }
+        } break;
+    default: break;
+    }
+}
+
+/** Create nodes and handles based on the XML of the edited path. */
+void PathManipulator::_createControlPointsFromGeometry()
+{
+    clear();
+
+    // sanitize pathvector and store it in SPCurve,
+    // so that _updateDragPoint doesn't crash on paths with naked movetos
+    Geom::PathVector pathv = pathv_to_linear_and_cubic_beziers(_spcurve->get_pathvector());
+    for (Geom::PathVector::iterator i = pathv.begin(); i != pathv.end(); ) {
+        // NOTE: this utilizes the fact that Geom::PathVector is an std::vector.
+        // When we erase an element, the next one slides into position,
+        // so we do not increment the iterator even though it is theoretically invalidated.
+        if (i->empty()) {
+            i = pathv.erase(i);
+        } else {
+            ++i;
+        }
+    }
+    if (pathv.empty()) {
+        return;
+    }
+    _spcurve->set_pathvector(pathv);
+
+    pathv *= (_edit_transform * _i2d_transform);
+
+    // in this loop, we know that there are no zero-segment subpaths
+    for (auto & pit : pathv) {
+        // prepare new subpath
+        SubpathPtr subpath(new NodeList(_subpaths));
+        _subpaths.push_back(subpath);
+
+        Node *previous_node = new Node(_multi_path_manipulator._path_data.node_data, pit.initialPoint());
+        subpath->push_back(previous_node);
+
+        bool closed = pit.closed();
+
+        for (Geom::Path::iterator cit = pit.begin(); cit != pit.end(); ++cit) {
+            Geom::Point pos = cit->finalPoint();
+            Node *current_node;
+            // if the closing segment is degenerate and the path is closed, we need to move
+            // the handle of the first node instead of creating a new one
+            if (closed && cit == --(pit.end())) {
+                current_node = subpath->begin().get_pointer();
+            } else {
+                /* regardless of segment type, create a new node at the end
+                 * of this segment (unless this is the last segment of a closed path
+                 * with a degenerate closing segment */
+                current_node = new Node(_multi_path_manipulator._path_data.node_data, pos);
+                subpath->push_back(current_node);
+            }
+            // if this is a bezier segment, move handles appropriately
+            // TODO: I don't know why the dynamic cast below doesn't want to work
+            //       when I replace BezierCurve with CubicBezier. Might be a bug
+            //       somewhere in pathv_to_linear_and_cubic_beziers
+            Geom::BezierCurve const *bezier = dynamic_cast<Geom::BezierCurve const*>(&*cit);
+            if (bezier && bezier->order() == 3)
+            {
+                previous_node->front()->setPosition((*bezier)[1]);
+                current_node ->back() ->setPosition((*bezier)[2]);
+            }
+            previous_node = current_node;
+        }
+        // If the path is closed, make the list cyclic
+        if (pit.closed()) subpath->setClosed(true);
+    }
+
+    // we need to set the nodetypes after all the handles are in place,
+    // so that pickBestType works correctly
+    // TODO maybe migrate to inkscape:node-types?
+    // TODO move this into SPPath - do not manipulate directly
+
+    //XML Tree being used here directly while it shouldn't be.
+    gchar const *nts_raw = _path ? _path->getRepr()->attribute(_nodetypesKey().data()) : nullptr;
+    /* Calculate the needed length of the nodetype string.
+     * For closed paths, the entry is duplicated for the starting node,
+     * so we can just use the count of segments including the closing one
+     * to include the extra end node. */
+    /* pad the string to required length with a bogus value.
+     * 'b' and any other letter not recognized by the parser causes the best fit to be set
+     * as the node type */
+    auto const *tsi = nts_raw ? nts_raw : "";
+    for (auto & _subpath : _subpaths) {
+        for (auto & j : *_subpath) {
+            char nodetype = (*tsi) ? (*tsi++) : 'b';
+            j.setType(Node::parse_nodetype(nodetype), false);
+        }
+        if (_subpath->closed() && *tsi) {
+            // STUPIDITY ALERT: it seems we need to use the duplicate type symbol instead of
+            // the first one to remain backward compatible.
+            _subpath->begin()->setType(Node::parse_nodetype(*tsi++), false);
+        }
+    }
+}
+
+//determines if the trace has a bspline effect and the number of steps that it takes
+int PathManipulator::_bsplineGetSteps() const {
+
+    LivePathEffect::LPEBSpline const *lpe_bsp = nullptr;
+
+    SPLPEItem * path = dynamic_cast<SPLPEItem *>(_path);
+    if (path){
+        if(path->hasPathEffect()){
+            Inkscape::LivePathEffect::Effect const *this_effect =
+                path->getFirstPathEffectOfType(Inkscape::LivePathEffect::BSPLINE);
+            if(this_effect){
+                lpe_bsp = dynamic_cast<LivePathEffect::LPEBSpline const*>(this_effect->getLPEObj()->get_lpe());
+            }
+        }
+    }
+    int steps = 0;
+    if(lpe_bsp){
+        steps = lpe_bsp->steps+1;
+    }
+    return steps;
+}
+
+// determines if the trace has bspline effect
+void PathManipulator::_recalculateIsBSpline(){
+    SPPath *path = dynamic_cast<SPPath *>(_path);
+    if (path && path->hasPathEffect()) {
+        Inkscape::LivePathEffect::Effect const *this_effect =
+            path->getFirstPathEffectOfType(Inkscape::LivePathEffect::BSPLINE);
+        if(this_effect){
+            _is_bspline = true;
+            return;
+        }
+    }
+    _is_bspline = false;
+}
+
+bool PathManipulator::_isBSpline() const {
+    return  _is_bspline;
+}
+
+// returns the corresponding strength to the position of the handlers
+double PathManipulator::_bsplineHandlePosition(Handle *h, bool check_other)
+{
+    using Geom::X;
+    using Geom::Y;
+    double pos = NO_POWER;
+    Node *n = h->parent();
+    Node * next_node = nullptr;
+    next_node = n->nodeToward(h);
+    if(next_node){
+        std::unique_ptr<SPCurve> line_inside_nodes(new SPCurve());
+        line_inside_nodes->moveto(n->position());
+        line_inside_nodes->lineto(next_node->position());
+        if(!are_near(h->position(), n->position())){
+            pos = Geom::nearest_time(Geom::Point(h->position()[X] - HANDLE_CUBIC_GAP, h->position()[Y] - HANDLE_CUBIC_GAP), *line_inside_nodes->first_segment());
+        }
+    }
+    if (pos == NO_POWER && check_other){
+        return _bsplineHandlePosition(h->other(), false);
+    }
+    return pos;
+}
+
+// give the location for the handler in the corresponding position
+Geom::Point PathManipulator::_bsplineHandleReposition(Handle *h, bool check_other)
+{
+    double pos = this->_bsplineHandlePosition(h, check_other);
+    return _bsplineHandleReposition(h,pos);
+}
+
+// give the location for the handler to the specified position
+Geom::Point PathManipulator::_bsplineHandleReposition(Handle *h,double pos){
+    using Geom::X;
+    using Geom::Y;
+    Geom::Point ret = h->position();
+    Node *n = h->parent();
+    Geom::D2< Geom::SBasis > sbasis_inside_nodes;
+    std::unique_ptr<SPCurve> line_inside_nodes(new SPCurve());
+    Node * next_node = nullptr;
+    next_node = n->nodeToward(h);
+    if(next_node && pos != NO_POWER){
+        line_inside_nodes->moveto(n->position());
+        line_inside_nodes->lineto(next_node->position());
+        sbasis_inside_nodes = line_inside_nodes->first_segment()->toSBasis();
+        ret = sbasis_inside_nodes.valueAt(pos);
+        ret = Geom::Point(ret[X] + HANDLE_CUBIC_GAP, ret[Y] + HANDLE_CUBIC_GAP);
+    }else{
+        if(pos == NO_POWER){
+            ret = n->position();
+        }
+    }
+    return ret;
+}
+
+/** Construct the geometric representation of nodes and handles, update the outline
+ * and display
+ * \param alert_LPE if true, first the LPE is warned what the new path is going to be before updating it
+ */
+void PathManipulator::_createGeometryFromControlPoints(bool alert_LPE)
+{
+    Geom::PathBuilder builder;
+    //Refresh if is bspline some times -think on path change selection, this value get lost
+    _recalculateIsBSpline();
+    for (std::list<SubpathPtr>::iterator spi = _subpaths.begin(); spi != _subpaths.end(); ) {
+        SubpathPtr subpath = *spi;
+        if (subpath->empty()) {
+            _subpaths.erase(spi++);
+            continue;
+        }
+        NodeList::iterator prev = subpath->begin();
+        builder.moveTo(prev->position());
+        for (NodeList::iterator i = ++subpath->begin(); i != subpath->end(); ++i) {
+            build_segment(builder, prev.ptr(), i.ptr());
+            prev = i;
+        }
+        if (subpath->closed()) {
+            // Here we link the last and first node if the path is closed.
+            // If the last segment is Bezier, we add it.
+            if (!prev->front()->isDegenerate() || !subpath->begin()->back()->isDegenerate()) {
+                build_segment(builder, prev.ptr(), subpath->begin().ptr());
+            }
+            // if that segment is linear, we just call closePath().
+            builder.closePath();
+        }
+        ++spi;
+    }
+    builder.flush();
+    Geom::PathVector pathv = builder.peek() * (_edit_transform * _i2d_transform).inverse();
+    for (Geom::PathVector::iterator i = pathv.begin(); i != pathv.end(); ) {
+        // NOTE: this utilizes the fact that Geom::PathVector is an std::vector.
+        // When we erase an element, the next one slides into position,
+        // so we do not increment the iterator even though it is theoretically invalidated.
+        if (i->empty()) {
+            i = pathv.erase(i);
+        } else {
+            ++i;
+        }
+    }
+    if (pathv.empty()) {
+        return;
+    }
+
+    if (_spcurve->get_pathvector() == pathv) {
+        return;
+    }
+    _spcurve->set_pathvector(pathv);
+    if (alert_LPE) {
+        /// \todo note that _path can be an Inkscape::LivePathEffect::Effect* too, kind of confusing, rework member naming?
+        SPPath *path = dynamic_cast<SPPath *>(_path);
+        if (path && path->hasPathEffect()) {
+            Inkscape::LivePathEffect::Effect *this_effect =
+                path->getFirstPathEffectOfType(Inkscape::LivePathEffect::POWERSTROKE);
+            if(this_effect){
+                LivePathEffect::LPEPowerStroke *lpe_pwr = dynamic_cast<LivePathEffect::LPEPowerStroke*>(this_effect->getLPEObj()->get_lpe());
+                if (lpe_pwr) {
+                    lpe_pwr->adjustForNewPath(pathv);
+                }
+            }
+        }
+    }
+    if (_live_outline) {
+        _updateOutline();
+    }
+    if (_live_objects) {
+        _setGeometry();
+    }
+}
+
+/** Build one segment of the geometric representation.
+ * @relates PathManipulator */
+void build_segment(Geom::PathBuilder &builder, Node *prev_node, Node *cur_node)
+{
+    if (cur_node->back()->isDegenerate() && prev_node->front()->isDegenerate())
+    {
+        // NOTE: It seems like the renderer cannot correctly handle vline / hline segments,
+        // and trying to display a path using them results in funny artifacts.
+        builder.lineTo(cur_node->position());
+    } else {
+        // this is a bezier segment
+        builder.curveTo(
+            prev_node->front()->position(),
+            cur_node->back()->position(),
+            cur_node->position());
+    }
+}
+
+/** Construct a node type string to store in the sodipodi:nodetypes attribute. */
+std::string PathManipulator::_createTypeString()
+{
+    // precondition: no single-node subpaths
+    std::stringstream tstr;
+    for (auto & _subpath : _subpaths) {
+        for (auto & j : *_subpath) {
+            tstr << j.type();
+        }
+        // nodestring format peculiarity: first node is counted twice for closed paths
+        if (_subpath->closed()) tstr << _subpath->begin()->type();
+    }
+    return tstr.str();
+}
+
+/** Update the path outline. */
+void PathManipulator::_updateOutline()
+{
+    if (!_show_outline) {
+        _outline->hide();
+        return;
+    }
+
+    Geom::PathVector pv = _spcurve->get_pathvector();
+    pv *= (_edit_transform * _i2d_transform);
+    // This SPCurve thing has to be killed with extreme prejudice
+    auto _hc = std::make_unique<SPCurve>();
+    if (_show_path_direction) {
+        // To show the direction, we append additional subpaths which consist of a single
+        // linear segment that starts at the time value of 0.5 and extends for 10 pixels
+        // at an angle 150 degrees from the unit tangent. This creates the appearance
+        // of little 'harpoons' that show the direction of the subpaths.
+        auto rot_scale_w2d = Geom::Rotate(210.0 / 180.0 * M_PI) * Geom::Scale(10.0) * _desktop->w2d();
+        Geom::PathVector arrows;
+        for (auto & path : pv) {
+            for (Geom::Path::iterator j = path.begin(); j != path.end_default(); ++j) {
+                Geom::Point at = j->pointAt(0.5);
+                Geom::Point ut = j->unitTangentAt(0.5);
+                Geom::Point arrow_end = at + (Geom::unit_vector(_desktop->d2w(ut)) * rot_scale_w2d);
+
+                Geom::Path arrow(at);
+                arrow.appendNew<Geom::LineSegment>(arrow_end);
+                arrows.push_back(arrow);
+            }
+        }
+        pv.insert(pv.end(), arrows.begin(), arrows.end());
+    }
+    _hc->set_pathvector(pv);
+    _outline->set_bpath(_hc.get());
+    _outline->show();
+}
+
+/** Retrieve the geometry of the edited object from the object tree */
+void PathManipulator::_getGeometry()
+{
+    using namespace Inkscape::LivePathEffect;
+    LivePathEffectObject *lpeobj = dynamic_cast<LivePathEffectObject *>(_path);
+    SPPath *path = dynamic_cast<SPPath *>(_path);
+    if (lpeobj) {
+        Effect *lpe = lpeobj->get_lpe();
+        if (lpe) {
+            PathParam *pathparam = dynamic_cast<PathParam *>(lpe->getParameter(_lpe_key.data()));
+            _spcurve.reset(new SPCurve(pathparam->get_pathvector()));
+        }
+    } else if (path) {
+        _spcurve = SPCurve::copy(path->curveForEdit());
+        // never allow NULL to sneak in here!
+        if (_spcurve == nullptr) {
+            _spcurve.reset(new SPCurve());
+        }
+    }
+}
+
+/** Set the geometry of the edited object in the object tree, but do not commit to XML */
+void PathManipulator::_setGeometry()
+{
+    using namespace Inkscape::LivePathEffect;
+    LivePathEffectObject *lpeobj = dynamic_cast<LivePathEffectObject *>(_path);
+    SPPath *path = dynamic_cast<SPPath *>(_path);
+    if (lpeobj) {
+        // copied from nodepath.cpp
+        // NOTE: if we are editing an LPE param, _path is not actually an SPPath, it is
+        // a LivePathEffectObject. (mad laughter)
+        Effect *lpe = lpeobj->get_lpe();
+        if (lpe) {
+            PathParam *pathparam = dynamic_cast<PathParam *>(lpe->getParameter(_lpe_key.data()));
+            if (pathparam->get_pathvector() == _spcurve->get_pathvector()) {
+                return; //False we dont update LPE
+            }
+            pathparam->set_new_value(_spcurve->get_pathvector(), false);
+            lpeobj->requestModified(SP_OBJECT_MODIFIED_FLAG);
+        }
+    } else if (path) {
+        // return true to leave the decision on empty to the caller.
+        // Maybe the path become empty and we want to update to empty
+        if (empty()) return;
+        if (path->curveBeforeLPE()) {
+            path->setCurveBeforeLPE(_spcurve.get());
+            if (!path->hasPathEffectOfTypeRecursive(Inkscape::LivePathEffect::SLICE)) {
+                sp_lpe_item_update_patheffect(path, true, false);
+            } else {
+                path->setCurve(_spcurve.get());
+            }
+        } else {
+            path->setCurve(_spcurve.get());
+        }
+    }
+}
+
+/** Figure out in what attribute to store the nodetype string. */
+Glib::ustring PathManipulator::_nodetypesKey()
+{
+    LivePathEffectObject *lpeobj = dynamic_cast<LivePathEffectObject *>(_path);
+    if (!lpeobj) {
+        return "sodipodi:nodetypes";
+    } else {
+        return _lpe_key + "-nodetypes";
+    }
+}
+
+/** Return the XML node we are editing.
+ * This method is wrong but necessary at the moment. */
+Inkscape::XML::Node *PathManipulator::_getXMLNode()
+{
+    //XML Tree being used here directly while it shouldn't be.
+    LivePathEffectObject *lpeobj = dynamic_cast<LivePathEffectObject *>(_path);
+    if (!lpeobj)
+        return _path->getRepr();
+    //XML Tree being used here directly while it shouldn't be.
+    return lpeobj->getRepr();
+}
+
+bool PathManipulator::_nodeClicked(Node *n, GdkEventButton *event)
+{
+    if (event->button != 1) return false;
+    if (held_alt(*event) && held_control(*event)) {
+        // Ctrl+Alt+click: delete nodes
+        hideDragPoint();
+        NodeList::iterator iter = NodeList::get_iterator(n);
+        NodeList &nl = iter->nodeList();
+
+        if (nl.size() <= 1 || (nl.size() <= 2 && !nl.closed())) {
+            // Removing last node of closed path - delete it
+            nl.kill();
+        } else {
+            // In other cases, delete the node under cursor
+            _deleteStretch(iter, iter.next(), true);
+        }
+
+        if (!empty()) { 
+            update(true);
+        }
+
+        // We need to call MPM's method because it could have been our last node
+        _multi_path_manipulator._doneWithCleanup(_("Delete node"));
+
+        return true;
+    } else if (held_control(*event)) {
+        // Ctrl+click: cycle between node types
+        if (!n->isEndNode()) {
+            n->setType(static_cast<NodeType>((n->type() + 1) % NODE_LAST_REAL_TYPE));
+            update();
+            _commit(_("Cycle node type"));
+        }
+        return true;
+    }
+    return false;
+}
+
+void PathManipulator::_handleGrabbed()
+{
+    _selection.hideTransformHandles();
+}
+
+void PathManipulator::_handleUngrabbed()
+{
+    _selection.restoreTransformHandles();
+    _commit(_("Drag handle"));
+}
+
+bool PathManipulator::_handleClicked(Handle *h, GdkEventButton *event)
+{
+    // retracting by Ctrl+click
+    if (event->button == 1 && held_control(*event)) {
+        h->move(h->parent()->position());
+        update();
+        _commit(_("Retract handle"));
+        return true;
+    }
+    return false;
+}
+
+void PathManipulator::_selectionChangedM(std::vector<SelectableControlPoint *> pvec, bool selected) {
+    for (auto & n : pvec) {
+        _selectionChanged(n, selected);
+    }
+}
+
+void PathManipulator::_selectionChanged(SelectableControlPoint *p, bool selected)
+{
+    // don't do anything if we do not show handles
+    if (!_show_handles) return;
+
+    // only do something if a node changed selection state
+    Node *node = dynamic_cast<Node*>(p);
+    if (!node) return;
+
+    // update handle display
+    NodeList::iterator iters[5];
+    iters[2] = NodeList::get_iterator(node);
+    iters[1] = iters[2].prev();
+    iters[3] = iters[2].next();
+    if (selected) {
+        // selection - show handles on this node and adjacent ones
+        node->showHandles(true);
+        if (iters[1]) iters[1]->showHandles(true);
+        if (iters[3]) iters[3]->showHandles(true);
+    } else {
+        /* Deselection is more complex.
+         * The change might affect 3 nodes - this one and two adjacent.
+         * If the node and both its neighbors are deselected, hide handles.
+         * Otherwise, leave as is. */
+        if (iters[1]) iters[0] = iters[1].prev();
+        if (iters[3]) iters[4] = iters[3].next();
+        bool nodesel[5];
+        for (int i = 0; i < 5; ++i) {
+            nodesel[i] = iters[i] && iters[i]->selected();
+        }
+        for (int i = 1; i < 4; ++i) {
+            if (iters[i] && !nodesel[i-1] && !nodesel[i] && !nodesel[i+1]) {
+                iters[i]->showHandles(false);
+            }
+        }
+    }
+}
+
+/** Removes all nodes belonging to this manipulator from the control point selection */
+void PathManipulator::_removeNodesFromSelection()
+{
+    // remove this manipulator's nodes from selection
+    for (auto & _subpath : _subpaths) {
+        for (NodeList::iterator j = _subpath->begin(); j != _subpath->end(); ++j) {
+            _selection.erase(j.get_pointer());
+        }
+    }
+}
+
+/** Update the XML representation and put the specified annotation on the undo stack */
+void PathManipulator::_commit(Glib::ustring const &annotation)
+{
+    writeXML();
+    if (_desktop) {
+        DocumentUndo::done(_desktop->getDocument(), annotation.data(), INKSCAPE_ICON("tool-node-editor"));
+    }
+}
+
+void PathManipulator::_commit(Glib::ustring const &annotation, gchar const *key)
+{
+    writeXML();
+    DocumentUndo::maybeDone(_desktop->getDocument(), key, annotation.data(), INKSCAPE_ICON("tool-node-editor"));
+}
+
+/** Update the position of the curve drag point such that it is over the nearest
+ * point of the path. */
+Geom::Coord PathManipulator::_updateDragPoint(Geom::Point const &evp)
+{
+    Geom::Coord dist = HUGE_VAL;
+
+    Geom::Affine to_desktop = _edit_transform * _i2d_transform;
+    Geom::PathVector pv = _spcurve->get_pathvector();
+    std::optional<Geom::PathVectorTime> pvp =
+        pv.nearestTime(_desktop->w2d(evp) * to_desktop.inverse());
+    if (!pvp) return dist;
+    Geom::Point nearest_pt = _desktop->d2w(pv.pointAt(*pvp) * to_desktop);
+
+    double fracpart = pvp->t;
+    std::list<SubpathPtr>::iterator spi = _subpaths.begin();
+    for (unsigned i = 0; i < pvp->path_index; ++i, ++spi) {}
+    NodeList::iterator first = (*spi)->before(pvp->asPathTime());
+    
+    dist = Geom::distance(evp, nearest_pt);
+
+    double stroke_tolerance = _getStrokeTolerance();
+    if (first && first.next() &&
+        fracpart != 0.0 &&
+        fracpart != 1.0 &&
+        dist < stroke_tolerance)
+    {
+        // stroke_tolerance is at least two.
+        int tolerance = std::max(2, (int)stroke_tolerance);
+        _dragpoint->setVisible(true);
+        _dragpoint->setPosition(_desktop->w2d(nearest_pt));
+        _dragpoint->setSize(2 * tolerance - 1);
+        _dragpoint->setTimeValue(fracpart);
+        _dragpoint->setIterator(first);
+    } else {
+        _dragpoint->setVisible(false);
+    }
+
+    return dist;
+}
+
+/// This is called on zoom change to update the direction arrows
+void PathManipulator::_updateOutlineOnZoomChange()
+{
+    if (_show_path_direction) _updateOutline();
+}
+
+/** Compute the radius from the edge of the path where clicks should initiate a curve drag
+ * or segment selection, in window coordinates. */
+double PathManipulator::_getStrokeTolerance()
+{
+    /* Stroke event tolerance is equal to half the stroke's width plus the global
+     * drag tolerance setting.  */
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    double ret = prefs->getIntLimited("/options/dragtolerance/value", 2, 0, 100);
+    if (_path && _path->style && !_path->style->stroke.isNone()) {
+        ret += _path->style->stroke_width.computed * 0.5
+            * (_edit_transform * _i2d_transform).descrim() // scale to desktop coords
+            * _desktop->current_zoom(); // == _d2w.descrim() - scale to window coords
+    }
+    return ret;
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/path-manipulator.h b/src/ui/tool/path-manipulator.h
new file mode 100644
index 0000000..ca861c6
--- /dev/null
+++ b/src/ui/tool/path-manipulator.h
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Path manipulator - a component that edits a single path on-canvas
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_PATH_MANIPULATOR_H
+#define SEEN_UI_TOOL_PATH_MANIPULATOR_H
+
+#include <string>
+#include <memory>
+#include <2geom/pathvector.h>
+#include <2geom/path-sink.h>
+#include <2geom/affine.h>
+#include "ui/tool/node.h"
+#include "ui/tool/manipulator.h"
+#include "live_effects/lpe-bspline.h"
+
+struct SPCanvasItem;
+class SPCurve;
+class SPPath;
+
+namespace Inkscape {
+
+class CanvasItemBpath;
+
+namespace XML { class Node; }
+
+namespace UI {
+
+class PathManipulator;
+class ControlPointSelection;
+class PathManipulatorObserver;
+class CurveDragPoint;
+class PathCanvasGroups;
+class MultiPathManipulator;
+class Node;
+class Handle;
+
+struct PathSharedData {
+    NodeSharedData node_data;
+    Inkscape::CanvasItemGroup *outline_group;
+    Inkscape::CanvasItemGroup *dragpoint_group;
+};
+
+/**
+ * Manipulator that edits a single path using nodes with handles.
+ * Currently only cubic bezier and linear segments are supported, but this might change
+ * some time in the future.
+ */
+class PathManipulator : public PointManipulator {
+public:
+    typedef SPPath *ItemType;
+
+    PathManipulator(MultiPathManipulator &mpm, SPObject *path, Geom::Affine const &edit_trans,
+        guint32 outline_color, Glib::ustring lpe_key);
+    ~PathManipulator() override;
+    bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *) override;
+
+    bool empty();
+    void writeXML();
+    void update(bool alert_LPE = false); // update display, but don't commit
+    void clear(); // remove all nodes from manipulator
+    SPObject *item() { return _path; }
+
+    void selectSubpaths();
+    void invertSelectionInSubpaths();
+
+    void insertNodeAtExtremum(ExtremumType extremum);
+    void insertNodes();
+    void insertNode(Geom::Point);
+    void insertNode(NodeList::iterator first, double t, bool take_selection);
+    void duplicateNodes();
+    void copySelectedPath(Geom::PathBuilder *builder);
+    void weldNodes(NodeList::iterator preserve_pos = NodeList::iterator());
+    void weldSegments();
+    void breakNodes();
+    void deleteNodes(bool keep_shape = true);
+    void deleteSegments();
+    void reverseSubpaths(bool selected_only);
+    void setSegmentType(SegmentType);
+
+    void scaleHandle(Node *n, int which, int dir, bool pixel);
+    void rotateHandle(Node *n, int which, int dir, bool pixel);
+
+    void showOutline(bool show);
+    void showHandles(bool show);
+    void showPathDirection(bool show);
+    void setLiveOutline(bool set);
+    void setLiveObjects(bool set);
+    void updateHandles();
+    void updatePath();
+    void setControlsTransform(Geom::Affine const &);
+    void hideDragPoint();
+    MultiPathManipulator &mpm() { return _multi_path_manipulator; }
+
+    NodeList::iterator subdivideSegment(NodeList::iterator after, double t);
+    NodeList::iterator extremeNode(NodeList::iterator origin, bool search_selected,
+        bool search_unselected, bool closest);
+
+    int _bsplineGetSteps() const;
+    // this is necessary for Tab-selection in MultiPathManipulator
+    SubpathList &subpathList() { return _subpaths; }
+
+    static bool is_item_type(void *item);
+private:
+    typedef NodeList Subpath;
+    typedef std::shared_ptr<NodeList> SubpathPtr;
+
+    void _createControlPointsFromGeometry();
+
+    void _recalculateIsBSpline();
+    bool _isBSpline() const;
+    double _bsplineHandlePosition(Handle *h, bool check_other = true);
+    Geom::Point _bsplineHandleReposition(Handle *h, bool check_other = true);
+    Geom::Point _bsplineHandleReposition(Handle *h, double pos);
+    void _createGeometryFromControlPoints(bool alert_LPE = false);
+    unsigned _deleteStretch(NodeList::iterator first, NodeList::iterator last, bool keep_shape);
+    std::string _createTypeString();
+    void _updateOutline();
+    //void _setOutline(Geom::PathVector const &);
+    void _getGeometry();
+    void _setGeometry();
+    Glib::ustring _nodetypesKey();
+    Inkscape::XML::Node *_getXMLNode();
+
+    void _selectionChangedM(std::vector<SelectableControlPoint *> pvec, bool selected);
+    void _selectionChanged(SelectableControlPoint * p, bool selected);
+    bool _nodeClicked(Node *, GdkEventButton *);
+    void _handleGrabbed();
+    bool _handleClicked(Handle *, GdkEventButton *);
+    void _handleUngrabbed();
+
+    void _externalChange(unsigned type);
+    void _removeNodesFromSelection();
+    void _commit(Glib::ustring const &annotation);
+    void _commit(Glib::ustring const &annotation, gchar const *key);
+    Geom::Coord _updateDragPoint(Geom::Point const &);
+    void _updateOutlineOnZoomChange();
+    double _getStrokeTolerance();
+    Handle *_chooseHandle(Node *n, int which);
+
+    SubpathList _subpaths;
+    MultiPathManipulator &_multi_path_manipulator;
+    SPObject *_path; ///< can be an SPPath or an Inkscape::LivePathEffect::Effect  !!!
+    std::unique_ptr<SPCurve> _spcurve; // in item coordinates
+    Inkscape::CanvasItemBpath *_outline = nullptr;
+    CurveDragPoint *_dragpoint; // an invisible control point hovering over curve
+    PathManipulatorObserver *_observer;
+    Geom::Affine _d2i_transform; ///< desktop-to-item transform
+    Geom::Affine _i2d_transform; ///< item-to-desktop transform, inverse of _d2i_transform
+    Geom::Affine _edit_transform; ///< additional transform to apply to editing controls
+    bool _show_handles = true;
+    bool _show_outline = false;
+    bool _show_path_direction = false;
+    bool _live_outline = true;
+    bool _live_objects = true;
+    bool _is_bspline = false;
+    Glib::ustring _lpe_key;
+
+    friend class PathManipulatorObserver;
+    friend class CurveDragPoint;
+    friend class Node;
+    friend class Handle;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/selectable-control-point.cpp b/src/ui/tool/selectable-control-point.cpp
new file mode 100644
index 0000000..5e5d0b2
--- /dev/null
+++ b/src/ui/tool/selectable-control-point.cpp
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "ui/tool/selectable-control-point.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+
+namespace Inkscape {
+namespace UI {
+
+ControlPoint::ColorSet SelectableControlPoint::_default_scp_color_set = {
+    {0xffffff00, 0x01000000}, // normal fill, stroke
+    {0xff0000ff, 0x01000000}, // mouseover fill, stroke
+    {0x0000ffff, 0x01000000}, // clicked fill, stroke
+    //
+    {0x0000ffff, 0x000000ff}, // normal fill, stroke when selected
+    {0xff000000, 0x000000ff}, // mouseover fill, stroke when selected
+    {0xff000000, 0x000000ff}  // clicked fill, stroke when selected
+};
+
+SelectableControlPoint::SelectableControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                                               Inkscape::CanvasItemCtrlType type,
+                                               ControlPointSelection &sel,
+                                               ColorSet const &cset,
+                                               Inkscape::CanvasItemGroup *group)
+    : ControlPoint(d, initial_pos, anchor, type, cset, group)
+    , _selection(sel)
+{
+    _canvas_item_ctrl->set_name("CanvasItemCtrl:SelectableControlPoint");
+    _selection.allPoints().insert(this);
+}
+
+SelectableControlPoint::SelectableControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                                               Glib::RefPtr<Gdk::Pixbuf> pixbuf,
+                                               ControlPointSelection &sel,
+                                               ColorSet const &cset,
+                                               Inkscape::CanvasItemGroup *group)
+    : ControlPoint(d, initial_pos, anchor, pixbuf, cset, group)
+    , _selection (sel)
+{
+    _selection.allPoints().insert(this);
+}
+
+SelectableControlPoint::~SelectableControlPoint()
+{
+    _selection.erase(this);
+    _selection.allPoints().erase(this);
+}
+
+bool SelectableControlPoint::grabbed(GdkEventMotion *)
+{
+    // if a point is dragged while not selected, it should select itself
+    if (!selected()) {
+        _takeSelection();
+    }
+    _selection._pointGrabbed(this);
+    return false;
+}
+
+void SelectableControlPoint::dragged(Geom::Point &new_pos, GdkEventMotion *event)
+{
+    _selection._pointDragged(new_pos, event);
+}
+
+void SelectableControlPoint::ungrabbed(GdkEventButton *)
+{
+    _selection._pointUngrabbed();
+}
+
+bool SelectableControlPoint::clicked(GdkEventButton *event)
+{
+    if (_selection._pointClicked(this, event))
+        return true;
+
+    if (event->button != 1) return false;
+    if (held_shift(*event)) {
+        if (selected()) {
+            _selection.erase(this);
+        } else {
+            _selection.insert(this);
+        }
+    } else {
+        _takeSelection();
+    }
+    return true;
+}
+
+void SelectableControlPoint::select(bool toselect)
+{
+    if (toselect) {
+        _selection.insert(this);
+    } else {
+        _selection.erase(this);
+    }
+}
+
+void SelectableControlPoint::_takeSelection()
+{
+    _selection.clear();
+    _selection.insert(this);
+}
+
+bool SelectableControlPoint::selected() const
+{
+    SelectableControlPoint *p = const_cast<SelectableControlPoint*>(this);
+    return _selection.find(p) != _selection.end();
+}
+
+void SelectableControlPoint::_setState(State state)
+{
+    if (!selected()) {
+        ControlPoint::_setState(state);
+    } else {
+        ColorEntry current = {0, 0};
+        ColorSet const &activeCset = (_isLurking()) ? invisible_cset : _cset;
+        switch (state) {
+            case STATE_NORMAL:
+                current = activeCset.selected_normal;
+                break;
+            case STATE_MOUSEOVER:
+                current = activeCset.selected_mouseover;
+                break;
+            case STATE_CLICKED:
+                current = activeCset.selected_clicked;
+                break;
+        }
+        _setColors(current);
+        _state = state;
+    }
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/selectable-control-point.h b/src/ui/tool/selectable-control-point.h
new file mode 100644
index 0000000..d57dd50
--- /dev/null
+++ b/src/ui/tool/selectable-control-point.h
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_SELECTABLE_CONTROL_POINT_H
+#define SEEN_UI_TOOL_SELECTABLE_CONTROL_POINT_H
+
+#include "ui/tool/control-point.h"
+
+namespace Inkscape {
+namespace UI {
+
+class ControlPointSelection;
+
+/**
+ * Desktop-bound selectable control object.
+ */
+class SelectableControlPoint : public ControlPoint {
+public:
+
+    ~SelectableControlPoint() override;
+    bool selected() const;
+    void updateState() { _setState(_state); }
+    virtual Geom::Rect bounds() const {
+        return Geom::Rect(position(), position());
+    }
+    virtual void select(bool toselect);
+    friend class NodeList;
+
+
+protected:
+
+    SelectableControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                           Inkscape::CanvasItemCtrlType type,
+                           ControlPointSelection &sel,
+                           ColorSet const &cset = _default_scp_color_set,
+                           Inkscape::CanvasItemGroup *group = nullptr);
+
+    SelectableControlPoint(SPDesktop *d, Geom::Point const &initial_pos, SPAnchorType anchor,
+                           Glib::RefPtr<Gdk::Pixbuf> pixbuf,
+                           ControlPointSelection &sel,
+                           ColorSet const &cset = _default_scp_color_set,
+                           Inkscape::CanvasItemGroup *group = nullptr);
+
+    void _setState(State state) override;
+
+    void dragged(Geom::Point &new_pos, GdkEventMotion *event) override;
+    bool grabbed(GdkEventMotion *event) override;
+    void ungrabbed(GdkEventButton *event) override;
+    bool clicked(GdkEventButton *event) override;
+
+    ControlPointSelection &_selection;
+
+private:
+
+    void _takeSelection();
+
+    static ColorSet _default_scp_color_set;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/selector.cpp b/src/ui/tool/selector.cpp
new file mode 100644
index 0000000..5b2fd45
--- /dev/null
+++ b/src/ui/tool/selector.cpp
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Selector component (click and rubberband)
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdk/gdkkeysyms.h>
+
+#include "control-point.h"
+#include "desktop.h"
+
+#include "display/control/canvas-item-rect.h"
+
+#include "ui/tools/tool-base.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/selector.h"
+
+namespace Inkscape {
+namespace UI {
+
+/** A hidden control point used for rubberbanding and selection.
+ * It uses a clever hack: the canvas item is hidden and only receives events when they
+ * are passed to it using Selector's event() function. When left mouse button
+ * is pressed, it grabs events and handles drags and clicks in the usual way. */
+class SelectorPoint : public ControlPoint {
+public:
+    SelectorPoint(SPDesktop *d, Inkscape::CanvasItemGroup *group, Selector *s) :
+        ControlPoint(d, Geom::Point(0,0), SP_ANCHOR_CENTER,
+                     Inkscape::CANVAS_ITEM_CTRL_TYPE_INVISIPOINT,
+                     invisible_cset, group),
+        _selector(s),
+        _cancel(false)
+    {
+        _canvas_item_ctrl->set_name("CanvasItemCtrl:SelectorPoint");
+        setVisible(false);
+        _rubber = new Inkscape::CanvasItemRect(_desktop->getCanvasControls());
+        _rubber->set_name("CanavasItemRect:SelectorPoint:Rubberband");
+        _rubber->set_stroke(0x8080ffff);
+        _rubber->set_inverted(true);
+        _rubber->hide();
+   }
+
+    ~SelectorPoint() override {
+        delete _rubber;
+    }
+
+    SPDesktop *desktop() { return _desktop; }
+
+    bool event(Inkscape::UI::Tools::ToolBase *ec, GdkEvent *e) {
+        return _eventHandler(ec, e);
+    }
+
+protected:
+    bool _eventHandler(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event) override {
+        if (event->type == GDK_KEY_PRESS               &&
+            shortcut_key(event->key) == GDK_KEY_Escape &&
+            _rubber->is_visible()                       )
+        {
+            _cancel = true;
+            _rubber->hide();
+            return true;
+        }
+        return ControlPoint::_eventHandler(event_context, event);
+    }
+
+private:
+    bool grabbed(GdkEventMotion *) override {
+        _cancel = false;
+        _start = position();
+        _rubber->show();
+        return false;
+    }
+
+    void dragged(Geom::Point &new_pos, GdkEventMotion *) override {
+        if (_cancel) return;
+        Geom::Rect sel(_start, new_pos);
+        _rubber->set_rect(sel);
+    }
+
+    void ungrabbed(GdkEventButton *event) override {
+        if (_cancel) return;
+        _rubber->hide();
+        Geom::Rect sel(_start, position());
+        _selector->signal_area.emit(sel, event);
+    }
+
+    bool clicked(GdkEventButton *event) override {
+        if (event->button != 1) return false;
+        _selector->signal_point.emit(position(), event);
+        return true;
+    }
+
+    Inkscape::CanvasItemRect *_rubber;
+    Selector *_selector;
+    Geom::Point _start;
+    bool _cancel;
+};
+
+
+Selector::Selector(SPDesktop *desktop)
+    : Manipulator(desktop)
+    , _dragger(new SelectorPoint(desktop, desktop->getCanvasControls(), this))
+{
+    _dragger->setVisible(false);
+}
+
+Selector::~Selector()
+{
+    delete _dragger;
+}
+
+bool Selector::event(Inkscape::UI::Tools::ToolBase *event_context, GdkEvent *event)
+{
+    // The hidden control point will capture all events after it obtains the grab,
+    // but it relies on this function to initiate it. If we pass only first button
+    // press events here, it won't interfere with any other event handling.
+    switch (event->type) {
+    case GDK_BUTTON_PRESS:
+        // Do not pass button presses other than left button to the control point.
+        // This way middle click and right click can be handled in ToolBase.
+        if (event->button.button == 1 && !event_context->is_space_panning()) {
+            _dragger->setPosition(_desktop->w2d(event_point(event->motion)));
+            return _dragger->event(event_context, event);
+        }
+        break;
+    default: break;
+    }
+    return false;
+}
+
+bool Selector::doubleClicked() {
+    return _dragger->doubleClicked();
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/selector.h b/src/ui/tool/selector.h
new file mode 100644
index 0000000..7ad0c3b
--- /dev/null
+++ b/src/ui/tool/selector.h
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Selector component (click and rubberband)
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_SELECTOR_H
+#define SEEN_UI_TOOL_SELECTOR_H
+
+#include <memory>
+#include <gdk/gdk.h>
+#include <2geom/rect.h>
+#include "ui/tool/manipulator.h"
+
+class SPDesktop;
+
+namespace Inkscape {
+
+class CanvasItemRect;
+
+namespace UI {
+
+class SelectorPoint;
+
+class Selector : public Manipulator {
+public:
+    Selector(SPDesktop *d);
+    ~Selector() override;
+    bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *) override;
+    virtual bool doubleClicked();
+    
+    sigc::signal<void, Geom::Rect const &, GdkEventButton*> signal_area;
+    sigc::signal<void, Geom::Point const &, GdkEventButton*> signal_point;
+private:
+    SelectorPoint *_dragger;
+    Geom::Point _start;
+    friend class SelectorPoint;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/shape-record.h b/src/ui/tool/shape-record.h
new file mode 100644
index 0000000..1f29453
--- /dev/null
+++ b/src/ui/tool/shape-record.h
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Structures that store data needed for shape editing which are not contained
+ * directly in the XML node
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_SHAPE_RECORD_H
+#define SEEN_UI_TOOL_SHAPE_RECORD_H
+
+#include <glibmm/ustring.h>
+#include <boost/operators.hpp>
+#include <2geom/affine.h>
+
+class SPItem;
+class SPObject;
+namespace Inkscape {
+namespace UI {
+
+/** Role of the shape in the drawing - affects outline display and color */
+enum ShapeRole {
+    SHAPE_ROLE_NORMAL,
+    SHAPE_ROLE_CLIPPING_PATH,
+    SHAPE_ROLE_MASK,
+    SHAPE_ROLE_LPE_PARAM // implies edit_original set to true in ShapeRecord
+};
+
+struct ShapeRecord :
+    public boost::totally_ordered<ShapeRecord>
+{
+    SPObject *object; // SP node for the edited shape could be a lpeoject invisible so we use a spobject
+    ShapeRole role;
+    Glib::ustring lpe_key; // name of LPE shape param being edited
+
+    Geom::Affine edit_transform; // how to transform controls - used for clipping paths, masks, and markers
+    double edit_rotation; // how to transform controls - used for markers
+
+    inline bool operator==(ShapeRecord const &o) const {
+        return object == o.object && lpe_key == o.lpe_key;
+    }
+    inline bool operator<(ShapeRecord const &o) const {
+        return object == o.object ? (lpe_key < o.lpe_key) : (object < o.object);
+    }
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/transform-handle-set.cpp b/src/ui/tool/transform-handle-set.cpp
new file mode 100644
index 0000000..875429a
--- /dev/null
+++ b/src/ui/tool/transform-handle-set.cpp
@@ -0,0 +1,827 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Affine transform handles component
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cmath>
+#include <algorithm>
+
+#include <glib/gi18n.h>
+
+#include <2geom/transforms.h>
+
+#include "control-point.h"
+#include "desktop.h"
+#include "pure-transform.h"
+#include "seltrans.h"
+#include "snap.h"
+
+#include "display/control/canvas-item-rect.h"
+
+#include "object/sp-namedview.h"
+
+#include "ui/tool/commit-events.h"
+#include "ui/tool/control-point-selection.h"
+#include "ui/tool/event-utils.h"
+#include "ui/tool/node.h"
+#include "ui/tool/selectable-control-point.h"
+#include "ui/tool/transform-handle-set.h"
+#include "ui/tools/node-tool.h"
+
+
+GType sp_select_context_get_type();
+
+namespace Inkscape {
+namespace UI {
+
+namespace {
+
+SPAnchorType corner_to_anchor(unsigned c) {
+    switch (c % 4) {
+    case 0: return SP_ANCHOR_NE;
+    case 1: return SP_ANCHOR_NW;
+    case 2: return SP_ANCHOR_SW;
+    default: return SP_ANCHOR_SE;
+    }
+}
+
+SPAnchorType side_to_anchor(unsigned s) {
+    switch (s % 4) {
+    case 0: return SP_ANCHOR_N;
+    case 1: return SP_ANCHOR_W;
+    case 2: return SP_ANCHOR_S;
+    default: return SP_ANCHOR_E;
+    }
+}
+
+// TODO move those two functions into a common place
+double snap_angle(double a) {
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int snaps = prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+    double unit_angle = M_PI / snaps;
+    return CLAMP(unit_angle * round(a / unit_angle), -M_PI, M_PI);
+}
+
+double snap_increment_degrees() {
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int snaps = prefs->getIntLimited("/options/rotationsnapsperpi/value", 12, 1, 1000);
+    return 180.0 / snaps;
+}
+
+} // anonymous namespace
+
+ControlPoint::ColorSet TransformHandle::thandle_cset = {
+    {0x000000ff, 0x000000ff},  // normal fill, stroke
+    {0x00ff66ff, 0x000000ff},  // mouseover fill, stroke
+    {0x00ff66ff, 0x000000ff},  // clicked fill, stroke
+    //
+    {0x000000ff, 0x000000ff},  // normal fill, stroke when selected
+    {0x00ff66ff, 0x000000ff},  // mouseover fill, stroke when selected
+    {0x00ff66ff, 0x000000ff}   // clicked fill, stroke when selected
+};
+
+TransformHandle::TransformHandle(TransformHandleSet &th, SPAnchorType anchor, Inkscape::CanvasItemCtrlType type)
+    : ControlPoint(th._desktop, Geom::Point(), anchor, type, thandle_cset, th._transform_handle_group)
+    , _th(th)
+{
+    _canvas_item_ctrl->set_name("CanvasItemCtrl:TransformHandle");
+    setVisible(false);
+}
+
+// TODO: This code is duplicated in seltrans.cpp; fix this!
+void TransformHandle::getNextClosestPoint(bool reverse)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (prefs->getBool("/options/snapclosestonly/value", false)) {
+        if (!_all_snap_sources_sorted.empty()) {
+            if (reverse) { // Shift-tab will find a closer point
+                if (_all_snap_sources_iter == _all_snap_sources_sorted.begin()) {
+                    _all_snap_sources_iter = _all_snap_sources_sorted.end();
+                }
+                --_all_snap_sources_iter;
+            } else { // Tab will find a point further away
+                ++_all_snap_sources_iter;
+                if (_all_snap_sources_iter == _all_snap_sources_sorted.end()) {
+                    _all_snap_sources_iter = _all_snap_sources_sorted.begin();
+                }
+            }
+
+            _snap_points.clear();
+            _snap_points.push_back(*_all_snap_sources_iter);
+
+            // Show the updated snap source now; otherwise it won't be shown until the selection is being moved again
+            SnapManager &m = _desktop->namedview->snap_manager;
+            m.setup(_desktop);
+            m.displaySnapsource(*_all_snap_sources_iter);
+            m.unSetup();
+        }
+    }
+}
+
+bool TransformHandle::grabbed(GdkEventMotion *)
+{
+    _origin = position();
+    _last_transform.setIdentity();
+    startTransform();
+
+    _th._setActiveHandle(this);
+    _setLurking(true);
+    _setState(_state);
+
+    // Collect the snap-candidates, one for each selected node. These will be stored in the _snap_points vector.
+    Inkscape::UI::Tools::NodeTool *nt = INK_NODE_TOOL(_th._desktop->event_context);
+    //ControlPointSelection *selection = nt->_selected_nodes.get();
+    ControlPointSelection* selection = nt->_selected_nodes;
+
+    selection->setOriginalPoints();
+    selection->getOriginalPoints(_snap_points);
+    selection->getUnselectedPoints(_unselected_points);
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (prefs->getBool("/options/snapclosestonly/value", false)) {
+        // Find the closest snap source candidate
+        _all_snap_sources_sorted = _snap_points;
+
+        // Calculate and store the distance to the reference point for each snap candidate point
+        for(auto & i : _all_snap_sources_sorted) {
+            i.setDistance(Geom::L2(i.getPoint() - _origin));
+        }
+
+        // Sort them ascending, using the distance calculated above as the single criteria
+        std::sort(_all_snap_sources_sorted.begin(), _all_snap_sources_sorted.end());
+
+        // Now get the closest snap source
+        _snap_points.clear();
+        if (!_all_snap_sources_sorted.empty()) {
+            _all_snap_sources_iter = _all_snap_sources_sorted.begin();
+            _snap_points.push_back(_all_snap_sources_sorted.front());
+        }
+    }
+
+    return false;
+}
+
+void TransformHandle::dragged(Geom::Point &new_pos, GdkEventMotion *event)
+{
+    Geom::Affine t = computeTransform(new_pos, event);
+    // protect against degeneracies
+    if (t.isSingular()) return;
+    Geom::Affine incr = _last_transform.inverse() * t;
+    if (incr.isSingular()) return;
+    _th.signal_transform.emit(incr);
+    _last_transform = t;
+}
+
+void TransformHandle::ungrabbed(GdkEventButton *)
+{
+    _snap_points.clear();
+    _th._clearActiveHandle();
+    _setLurking(false);
+    _setState(_state);
+    endTransform();
+    _th.signal_commit.emit(getCommitEvent());
+
+    //updates the positions of the nodes
+    Inkscape::UI::Tools::NodeTool *nt = INK_NODE_TOOL(_th._desktop->event_context);
+    ControlPointSelection* selection = nt->_selected_nodes;
+    selection->setOriginalPoints();
+}
+
+
+class ScaleHandle : public TransformHandle {
+public:
+    ScaleHandle(TransformHandleSet &th, SPAnchorType anchor, Inkscape::CanvasItemCtrlType type)
+        : TransformHandle(th, anchor, type)
+    {}
+protected:
+    Glib::ustring _getTip(unsigned state) const override {
+        if (state_held_control(state)) {
+            if (state_held_shift(state)) {
+                return C_("Transform handle tip",
+                    "<b>Shift+Ctrl</b>: scale uniformly about the rotation center");
+            }
+            return C_("Transform handle tip", "<b>Ctrl:</b> scale uniformly");
+        }
+        if (state_held_shift(state)) {
+            if (state_held_alt(state)) {
+                return C_("Transform handle tip",
+                    "<b>Shift+Alt</b>: scale using an integer ratio about the rotation center");
+            }
+            return C_("Transform handle tip", "<b>Shift</b>: scale from the rotation center");
+        }
+        if (state_held_alt(state)) {
+            return C_("Transform handle tip", "<b>Alt</b>: scale using an integer ratio");
+        }
+        return C_("Transform handle tip", "<b>Scale handle</b>: drag to scale the selection");
+    }
+
+    Glib::ustring _getDragTip(GdkEventMotion */*event*/) const override {
+        return format_tip(C_("Transform handle tip",
+            "Scale by %.2f%% x %.2f%%"), _last_scale_x * 100, _last_scale_y * 100);
+    }
+
+    bool _hasDragTips() const override { return true; }
+
+    static double _last_scale_x, _last_scale_y;
+};
+double ScaleHandle::_last_scale_x = 1.0;
+double ScaleHandle::_last_scale_y = 1.0;
+
+/**
+ * Corner scaling handle for node transforms.
+ */
+class ScaleCornerHandle : public ScaleHandle {
+public:
+
+    ScaleCornerHandle(TransformHandleSet &th, unsigned corner, unsigned d_corner) :
+        ScaleHandle(th, corner_to_anchor(d_corner), Inkscape::CANVAS_ITEM_CTRL_TYPE_ADJ_HANDLE),
+        _corner(corner)
+    {}
+
+protected:
+    void startTransform() override {
+        _sc_center = _th.rotationCenter();
+        _sc_opposite = _th.bounds().corner(_corner + 2);
+        _last_scale_x = _last_scale_y = 1.0;
+    }
+
+    Geom::Affine computeTransform(Geom::Point const &new_pos, GdkEventMotion *event) override {
+        Geom::Point scc = held_shift(*event) ? _sc_center : _sc_opposite;
+        Geom::Point vold = _origin - scc, vnew = new_pos - scc;
+        // avoid exploding the selection
+        if (Geom::are_near(vold[Geom::X], 0) || Geom::are_near(vold[Geom::Y], 0))
+            return Geom::identity();
+
+        Geom::Scale scale = Geom::Scale(vnew[Geom::X] / vold[Geom::X], vnew[Geom::Y] / vold[Geom::Y]);
+
+        if (held_alt(*event)) {
+            for (unsigned i = 0; i < 2; ++i) {
+                if (fabs(scale[i]) >= 1.0) {
+                    scale[i] = round(scale[i]);
+                } else {
+                    scale[i] = 1.0 / round(1.0 / MIN(scale[i],10));
+                }
+            }
+        } else {
+            SnapManager &m = _th._desktop->namedview->snap_manager;
+            m.setupIgnoreSelection(_th._desktop, true, &_unselected_points);
+
+            Inkscape::PureScale *ptr;
+            if (held_control(*event)) {
+                scale[0] = scale[1] = std::min(scale[0], scale[1]);
+                ptr = new Inkscape::PureScaleConstrained(Geom::Scale(scale[0], scale[1]), scc);
+            } else {
+                ptr = new Inkscape::PureScale(Geom::Scale(scale[0], scale[1]), scc, false);
+            }
+            m.snapTransformed(_snap_points, _origin, (*ptr));
+            m.unSetup();
+            if (ptr->best_snapped_point.getSnapped()) {
+                scale = ptr->getScaleSnapped();
+            }
+
+            delete ptr;
+        }
+
+        _last_scale_x = scale[0];
+        _last_scale_y = scale[1];
+        Geom::Affine t = Geom::Translate(-scc)
+            * Geom::Scale(scale[0], scale[1])
+            * Geom::Translate(scc);
+        return t;
+    }
+
+    CommitEvent getCommitEvent() override {
+        return _last_transform.isUniformScale()
+            ? COMMIT_MOUSE_SCALE_UNIFORM
+            : COMMIT_MOUSE_SCALE;
+    }
+
+private:
+
+    Geom::Point _sc_center;
+    Geom::Point _sc_opposite;
+    unsigned _corner;
+};
+
+/**
+ * Side scaling handle for node transforms.
+ */
+class ScaleSideHandle : public ScaleHandle {
+public:
+    ScaleSideHandle(TransformHandleSet &th, unsigned side, unsigned d_side)
+        : ScaleHandle(th, side_to_anchor(d_side), Inkscape::CANVAS_ITEM_CTRL_TYPE_ADJ_HANDLE)
+        , _side(side)
+    {}
+protected:
+    void startTransform() override {
+        _sc_center = _th.rotationCenter();
+        Geom::Rect b = _th.bounds();
+        _sc_opposite = Geom::middle_point(b.corner(_side + 2), b.corner(_side + 3));
+        _last_scale_x = _last_scale_y = 1.0;
+    }
+    Geom::Affine computeTransform(Geom::Point const &new_pos, GdkEventMotion *event) override {
+        Geom::Point scc = held_shift(*event) ? _sc_center : _sc_opposite;
+        Geom::Point vs;
+        Geom::Dim2 d1 = static_cast<Geom::Dim2>((_side + 1) % 2);
+        Geom::Dim2 d2 = static_cast<Geom::Dim2>(_side % 2);
+
+        // avoid exploding the selection
+        if (Geom::are_near(scc[d1], _origin[d1]))
+            return Geom::identity();
+
+        vs[d1] = (new_pos - scc)[d1] / (_origin - scc)[d1];
+        if (held_alt(*event)) {
+            if (fabs(vs[d1]) >= 1.0) {
+                vs[d1] = round(vs[d1]);
+            } else {
+                vs[d1] = 1.0 / round(1.0 / MIN(vs[d1],10));
+            }
+            vs[d2] = 1.0;
+        } else {
+            SnapManager &m = _th._desktop->namedview->snap_manager;
+            m.setupIgnoreSelection(_th._desktop, true, &_unselected_points);
+
+            bool uniform = held_control(*event);
+            Inkscape::PureStretchConstrained psc = Inkscape::PureStretchConstrained(vs[d1], scc, d1, uniform);
+            m.snapTransformed(_snap_points, _origin, psc);
+            m.unSetup();
+
+            if (psc.best_snapped_point.getSnapped()) {
+                Geom::Point result = psc.getStretchSnapped().vector(); //best_snapped_point.getTransformation();
+                vs[d1] = result[d1];
+                vs[d2] = result[d2];
+            } else {
+                // on ctrl, apply uniform scaling instead of stretching
+                // Preserve aspect ratio, but never flip in the dimension not being edited (by using fabs())
+                vs[d2] = uniform ? fabs(vs[d1]) : 1.0;
+            }
+        }
+
+        _last_scale_x = vs[Geom::X];
+        _last_scale_y = vs[Geom::Y];
+        Geom::Affine t = Geom::Translate(-scc)
+            * Geom::Scale(vs)
+            * Geom::Translate(scc);
+        return t;
+    }
+    CommitEvent getCommitEvent() override {
+        return _last_transform.isUniformScale()
+            ? COMMIT_MOUSE_SCALE_UNIFORM
+            : COMMIT_MOUSE_SCALE;
+    }
+
+private:
+
+    Geom::Point _sc_center;
+    Geom::Point _sc_opposite;
+    unsigned _side;
+};
+
+/**
+ * Rotation handle for node transforms.
+ */
+class RotateHandle : public TransformHandle {
+public:
+    RotateHandle(TransformHandleSet &th, unsigned corner, unsigned d_corner)
+        : TransformHandle(th, corner_to_anchor(d_corner), Inkscape::CANVAS_ITEM_CTRL_TYPE_ADJ_ROTATE)
+        , _corner(corner)
+    {}
+protected:
+
+    void startTransform() override {
+        _rot_center = _th.rotationCenter();
+        _rot_opposite = _th.bounds().corner(_corner + 2);
+        _last_angle = 0;
+    }
+
+    Geom::Affine computeTransform(Geom::Point const &new_pos, GdkEventMotion *event) override
+    {
+        Geom::Point rotc = held_shift(*event) ? _rot_opposite : _rot_center;
+        double angle = Geom::angle_between(_origin - rotc, new_pos - rotc);
+        if (held_control(*event)) {
+            angle = snap_angle(angle);
+        } else {
+            SnapManager &m = _th._desktop->namedview->snap_manager;
+            m.setupIgnoreSelection(_th._desktop, true, &_unselected_points);
+            Inkscape::PureRotateConstrained prc = Inkscape::PureRotateConstrained(angle, rotc);
+            m.snapTransformed(_snap_points, _origin, prc);
+            m.unSetup();
+
+            if (prc.best_snapped_point.getSnapped()) {
+                angle = prc.getAngleSnapped(); //best_snapped_point.getTransformation()[0];
+            }
+        }
+
+        _last_angle = angle;
+        Geom::Affine t = Geom::Translate(-rotc)
+            * Geom::Rotate(angle)
+            * Geom::Translate(rotc);
+        return t;
+    }
+
+    CommitEvent getCommitEvent() override { return COMMIT_MOUSE_ROTATE; }
+
+    Glib::ustring _getTip(unsigned state) const override {
+        if (state_held_shift(state)) {
+            if (state_held_control(state)) {
+                return format_tip(C_("Transform handle tip",
+                    "<b>Shift+Ctrl</b>: rotate around the opposite corner and snap "
+                    "angle to %f° increments"), snap_increment_degrees());
+            }
+            return C_("Transform handle tip", "<b>Shift</b>: rotate around the opposite corner");
+        }
+        if (state_held_control(state)) {
+            return format_tip(C_("Transform handle tip",
+                "<b>Ctrl</b>: snap angle to %f° increments"), snap_increment_degrees());
+        }
+        return C_("Transform handle tip", "<b>Rotation handle</b>: drag to rotate "
+            "the selection around the rotation center");
+    }
+
+    Glib::ustring _getDragTip(GdkEventMotion */*event*/) const override {
+        return format_tip(C_("Transform handle tip", "Rotate by %.2f°"),
+            _last_angle * 180.0 / M_PI);
+    }
+
+    bool _hasDragTips() const override { return true; }
+
+private:
+    Geom::Point _rot_center;
+    Geom::Point _rot_opposite;
+    unsigned _corner;
+    static double _last_angle;
+};
+double RotateHandle::_last_angle = 0;
+
+class SkewHandle : public TransformHandle {
+public:
+    SkewHandle(TransformHandleSet &th, unsigned side, unsigned d_side)
+        : TransformHandle(th, side_to_anchor(d_side), Inkscape::CANVAS_ITEM_CTRL_TYPE_ADJ_SKEW)
+        , _side(side)
+    {}
+
+protected:
+
+    void startTransform() override {
+        _skew_center = _th.rotationCenter();
+        Geom::Rect b = _th.bounds();
+        _skew_opposite = Geom::middle_point(b.corner(_side + 2), b.corner(_side + 3));
+        _last_angle = 0;
+        _last_horizontal = _side % 2;
+    }
+
+    Geom::Affine computeTransform(Geom::Point const &new_pos, GdkEventMotion *event) override
+    {
+        Geom::Point scc = held_shift(*event) ? _skew_center : _skew_opposite;
+        Geom::Dim2 d1 = static_cast<Geom::Dim2>((_side + 1) % 2);
+        Geom::Dim2 d2 = static_cast<Geom::Dim2>(_side % 2);
+
+        Geom::Point const initial_delta = _origin - scc;
+
+        if (fabs(initial_delta[d1]) < 1e-15) {
+            return Geom::Affine();
+        }
+
+        // Calculate the scale factors, which can be either visual or geometric
+        // depending on which type of bbox is currently being used (see preferences -> selector tool)
+        Geom::Scale scale = calcScaleFactors(_origin, new_pos, scc, false);
+        Geom::Scale skew = calcScaleFactors(_origin, new_pos, scc, true);
+        scale[d2] = 1;
+        skew[d2] = 1;
+
+        // Skew handles allow scaling up to integer multiples of the original size
+        // in the second direction; prevent explosions
+
+        if (fabs(scale[d1]) < 1) {
+            // Prevent shrinking of the selected object, while allowing mirroring
+            scale[d1] = copysign(1.0, scale[d1]);
+        } else {
+            // Allow expanding of the selected object by integer multiples
+            scale[d1] = floor(scale[d1] + 0.5);
+        }
+
+        double angle = atan(skew[d1] / scale[d1]);
+
+        if (held_control(*event)) {
+            angle = snap_angle(angle);
+            skew[d1] = tan(angle) * scale[d1];
+        } else {
+            SnapManager &m = _th._desktop->namedview->snap_manager;
+            m.setupIgnoreSelection(_th._desktop, true, &_unselected_points);
+
+            Inkscape::PureSkewConstrained psc = Inkscape::PureSkewConstrained(skew[d1], scale[d1], scc, d2);
+            m.snapTransformed(_snap_points, _origin, psc);
+            m.unSetup();
+
+            if (psc.best_snapped_point.getSnapped()) {
+                skew[d1] = psc.getSkewSnapped(); //best_snapped_point.getTransformation()[0];
+            }
+        }
+
+        _last_angle = angle;
+
+        // Update the handle position
+        Geom::Point new_new_pos;
+        new_new_pos[d2] = initial_delta[d1] * skew[d1] + _origin[d2];
+        new_new_pos[d1] = initial_delta[d1] * scale[d1] + scc[d1];
+
+        // Calculate the relative affine
+        Geom::Affine relative_affine = Geom::identity();
+        relative_affine[2*d1 + d1] = (new_new_pos[d1] - scc[d1]) / initial_delta[d1];
+        relative_affine[2*d1 + (d2)] = (new_new_pos[d2] - _origin[d2]) / initial_delta[d1];
+        relative_affine[2*(d2) + (d1)] = 0;
+        relative_affine[2*(d2) + (d2)] = 1;
+
+        for (int i = 0; i < 2; i++) {
+            if (fabs(relative_affine[3*i]) < 1e-15) {
+                relative_affine[3*i] = 1e-15;
+            }
+        }
+
+        Geom::Affine t = Geom::Translate(-scc)
+            * relative_affine
+            * Geom::Translate(scc);
+
+        return t;
+    }
+
+    CommitEvent getCommitEvent() override {
+        return (_side % 2)
+            ? COMMIT_MOUSE_SKEW_Y
+            : COMMIT_MOUSE_SKEW_X;
+    }
+
+    Glib::ustring _getTip(unsigned state) const override {
+        if (state_held_shift(state)) {
+            if (state_held_control(state)) {
+                return format_tip(C_("Transform handle tip",
+                    "<b>Shift+Ctrl</b>: skew about the rotation center with snapping "
+                    "to %f° increments"), snap_increment_degrees());
+            }
+            return C_("Transform handle tip", "<b>Shift</b>: skew about the rotation center");
+        }
+        if (state_held_control(state)) {
+            return format_tip(C_("Transform handle tip",
+                "<b>Ctrl</b>: snap skew angle to %f° increments"), snap_increment_degrees());
+        }
+        return C_("Transform handle tip",
+            "<b>Skew handle</b>: drag to skew (shear) selection about "
+            "the opposite handle");
+    }
+
+    Glib::ustring _getDragTip(GdkEventMotion */*event*/) const override {
+        if (_last_horizontal) {
+            return format_tip(C_("Transform handle tip", "Skew horizontally by %.2f°"),
+                _last_angle * 360.0);
+        } else {
+            return format_tip(C_("Transform handle tip", "Skew vertically by %.2f°"),
+                _last_angle * 360.0);
+        }
+    }
+
+    bool _hasDragTips() const override { return true; }
+
+private:
+
+    Geom::Point _skew_center;
+    Geom::Point _skew_opposite;
+    unsigned _side;
+    static bool _last_horizontal;
+    static double _last_angle;
+};
+bool SkewHandle::_last_horizontal = false;
+double SkewHandle::_last_angle = 0;
+
+class RotationCenter : public ControlPoint {
+
+public:
+    RotationCenter(TransformHandleSet &th) :
+        ControlPoint(th._desktop, Geom::Point(), SP_ANCHOR_CENTER,
+                     Inkscape::CANVAS_ITEM_CTRL_TYPE_ADJ_CENTER,
+                     _center_cset, th._transform_handle_group),
+        _th(th)
+    {
+        setVisible(false);
+    }
+
+protected:
+    void dragged(Geom::Point &new_pos, GdkEventMotion *event) override {
+        SnapManager &sm = _th._desktop->namedview->snap_manager;
+        sm.setup(_th._desktop);
+        bool snap = !held_shift(*event) && sm.someSnapperMightSnap();
+        if (held_control(*event)) {
+            // constrain to axes
+            Geom::Point origin = _last_drag_origin();
+            std::vector<Inkscape::Snapper::SnapConstraint> constraints;
+            constraints.emplace_back(origin, Geom::Point(1, 0));
+            constraints.emplace_back(origin, Geom::Point(0, 1));
+            new_pos = sm.multipleConstrainedSnaps(Inkscape::SnapCandidatePoint(new_pos,
+                SNAPSOURCE_ROTATION_CENTER), constraints, held_shift(*event)).getPoint();
+        } else if (snap) {
+            sm.freeSnapReturnByRef(new_pos, SNAPSOURCE_ROTATION_CENTER);
+        }
+        sm.unSetup();
+    }
+    Glib::ustring _getTip(unsigned /*state*/) const override {
+        return C_("Transform handle tip",
+            "<b>Rotation center</b>: drag to change the origin of transforms");
+    }
+
+private:
+
+    static ColorSet _center_cset;
+    TransformHandleSet &_th;
+};
+
+ControlPoint::ColorSet RotationCenter::_center_cset = {
+    {0x000000ff, 0x000000ff},  // normal fill, stroke
+    {0x00ff66ff, 0x000000ff},  // mouseover fill, stroke
+    {0x00ff66ff, 0x000000ff},  // clicked fill, stroke
+    //
+    {0x000000ff, 0x000000ff},  // normal fill, stroke when selected
+    {0x00ff66ff, 0x000000ff},  // mouseover fill, stroke when selected
+    {0x00ff66ff, 0x000000ff}   // clicked fill, stroke when selected
+};
+
+
+TransformHandleSet::TransformHandleSet(SPDesktop *d, Inkscape::CanvasItemGroup *th_group)
+    : Manipulator(d)
+    , _active(nullptr)
+    , _transform_handle_group(th_group)
+    , _mode(MODE_SCALE)
+    , _in_transform(false)
+    , _visible(true)
+{
+    _trans_outline = new Inkscape::CanvasItemRect(_desktop->getCanvasControls());
+    _trans_outline->set_name("CanvasItemRect:Transform");
+    _trans_outline->hide();
+    _trans_outline->set_dashed(true);
+
+    bool y_inverted = !d->is_yaxisdown();
+    for (unsigned i = 0; i < 4; ++i) {
+        unsigned d_c = y_inverted ? i : 3 - i;
+        unsigned d_s = y_inverted ? i : 6 - i;
+        _scale_corners[i] = new ScaleCornerHandle(*this, i, d_c);
+        _scale_sides[i] = new ScaleSideHandle(*this, i, d_s);
+        _rot_corners[i] = new RotateHandle(*this, i, d_c);
+        _skew_sides[i] = new SkewHandle(*this, i, d_s);
+    }
+    _center = new RotationCenter(*this);
+    // when transforming, update rotation center position
+    signal_transform.connect(sigc::mem_fun(*_center, &RotationCenter::transform));
+}
+
+TransformHandleSet::~TransformHandleSet()
+{
+    for (auto & _handle : _handles) {
+        delete _handle;
+    }
+}
+
+void TransformHandleSet::setMode(Mode m)
+{
+    _mode = m;
+    _updateVisibility(_visible);
+}
+
+Geom::Rect TransformHandleSet::bounds() const
+{
+    return Geom::Rect(*_scale_corners[0], *_scale_corners[2]);
+}
+
+ControlPoint const &TransformHandleSet::rotationCenter() const
+{
+    return *_center;
+}
+
+ControlPoint &TransformHandleSet::rotationCenter()
+{
+    return *_center;
+}
+
+void TransformHandleSet::setVisible(bool v)
+{
+    if (_visible != v) {
+        _visible = v;
+        _updateVisibility(_visible);
+    }
+}
+
+void TransformHandleSet::setBounds(Geom::Rect const &r, bool preserve_center)
+{
+    if (_in_transform) {
+        _trans_outline->set_rect(r);
+    } else {
+        for (unsigned i = 0; i < 4; ++i) {
+            _scale_corners[i]->move(r.corner(i));
+            _scale_sides[i]->move(Geom::middle_point(r.corner(i), r.corner(i+1)));
+            _rot_corners[i]->move(r.corner(i));
+            _skew_sides[i]->move(Geom::middle_point(r.corner(i), r.corner(i+1)));
+        }
+        if (!preserve_center) _center->move(r.midpoint());
+        if (_visible) _updateVisibility(true);
+    }
+}
+
+bool TransformHandleSet::event(Inkscape::UI::Tools::ToolBase *, GdkEvent*)
+{
+    return false;
+}
+
+void TransformHandleSet::_emitTransform(Geom::Affine const &t)
+{
+    signal_transform.emit(t);
+    _center->transform(t);
+}
+
+void TransformHandleSet::_setActiveHandle(ControlPoint *th)
+{
+    _active = th;
+    if (_in_transform)
+        throw std::logic_error("Transform initiated when another transform in progress");
+    _in_transform = true;
+    // hide all handles except the active one
+    _updateVisibility(false);
+    _trans_outline->show();
+}
+
+void TransformHandleSet::_clearActiveHandle()
+{
+    // This can only be called from handles, so they had to be visible before _setActiveHandle
+    _trans_outline->hide();
+    _active = nullptr;
+    _in_transform = false;
+    _updateVisibility(_visible);
+}
+
+void TransformHandleSet::_updateVisibility(bool v)
+{
+    if (v) {
+        Geom::Rect b = bounds();
+
+        // Roughly estimate handle size.
+        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+        int handle_index = prefs->getIntLimited("/options/grabsize/value", 3, 1, 15);
+        int handle_size = handle_index * 2 + 1; // Handle pixmaps are actually larger but that's to allow space when handle is rotated.
+
+        Geom::Point bp = b.dimensions();
+
+        // do not scale when the bounding rectangle has zero width or height
+        bool show_scale = (_mode == MODE_SCALE) && !Geom::are_near(b.minExtent(), 0);
+        // do not rotate if the bounding rectangle is degenerate
+        bool show_rotate = (_mode == MODE_ROTATE_SKEW) && !Geom::are_near(b.maxExtent(), 0);
+        bool show_scale_side[2], show_skew[2];
+
+        // show sides if:
+        // a) there is enough space between corner handles, or
+        // b) corner handles are not shown, but side handles make sense
+        // this affects horizontal and vertical scale handles; skew handles never
+        // make sense if rotate handles are not shown
+        for (unsigned i = 0; i < 2; ++i) {
+            Geom::Dim2 d = static_cast<Geom::Dim2>(i);
+            Geom::Dim2 otherd = static_cast<Geom::Dim2>((i+1)%2);
+            show_scale_side[i] = (_mode == MODE_SCALE);
+            show_scale_side[i] &= (show_scale ? bp[d] >= handle_size
+                : !Geom::are_near(bp[otherd], 0));
+            show_skew[i] = (show_rotate && bp[d] >= handle_size
+                && !Geom::are_near(bp[otherd], 0));
+        }
+
+        for (unsigned i = 0; i < 4; ++i) {
+            _scale_corners[i]->setVisible(show_scale);
+            _rot_corners[i]->setVisible(show_rotate);
+            _scale_sides[i]->setVisible(show_scale_side[i%2]);
+            _skew_sides[i]->setVisible(show_skew[i%2]);
+        }
+
+        // show rotation center
+        _center->setVisible(show_rotate);
+    } else {
+        for (auto & _handle : _handles) {
+            if (_handle != _active)
+                _handle->setVisible(false);
+        }
+    }
+    
+}
+
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/ui/tool/transform-handle-set.h b/src/ui/tool/transform-handle-set.h
new file mode 100644
index 0000000..4b6877c
--- /dev/null
+++ b/src/ui/tool/transform-handle-set.h
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Affine transform handles component
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_TRANSFORM_HANDLE_SET_H
+#define SEEN_UI_TOOL_TRANSFORM_HANDLE_SET_H
+
+#include <memory>
+#include <gdk/gdk.h>
+#include <2geom/forward.h>
+#include "ui/tool/commit-events.h"
+#include "ui/tool/manipulator.h"
+#include "ui/tool/control-point.h"
+#include "enums.h"
+#include "snap-candidate.h"
+
+class SPDesktop;
+
+namespace Inkscape {
+
+class CanvasItemGroup;
+class CanvasItemRect;
+
+namespace UI {
+
+class RotateHandle;
+class SkewHandle;
+class ScaleCornerHandle;
+class ScaleSideHandle;
+class RotationCenter;
+
+class TransformHandleSet : public Manipulator {
+public:
+
+    enum Mode {
+        MODE_SCALE,
+        MODE_ROTATE_SKEW
+    };
+
+    TransformHandleSet(SPDesktop *d, Inkscape::CanvasItemGroup *th_group);
+    ~TransformHandleSet() override;
+    bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *) override;
+
+    bool visible() const { return _visible; }
+    Mode mode() const { return _mode; }
+    Geom::Rect bounds() const;
+    void setVisible(bool v);
+
+    /** Sets the mode of transform handles (scale or rotate). */
+    void setMode(Mode m);
+
+    void setBounds(Geom::Rect const &, bool preserve_center = false);
+
+    bool transforming() { return _in_transform; }
+
+    ControlPoint const &rotationCenter() const;
+    ControlPoint &rotationCenter();
+
+    sigc::signal<void, Geom::Affine const &> signal_transform;
+    sigc::signal<void, CommitEvent> signal_commit;
+
+private:
+
+    void _emitTransform(Geom::Affine const &);
+    void _setActiveHandle(ControlPoint *h);
+    void _clearActiveHandle();
+
+    /** Update the visibility of transformation handles according to settings and the dimensions
+     * of the bounding box. It hides the handles that would have no effect or lead to
+     * discontinuities. Additionally, side handles for which there is no space are not shown.
+     */
+    void _updateVisibility(bool v);
+
+    // TODO unions must GO AWAY:
+    union {
+        ControlPoint *_handles[17];
+        struct {
+            ScaleCornerHandle *_scale_corners[4];
+            ScaleSideHandle *_scale_sides[4];
+            RotateHandle *_rot_corners[4];
+            SkewHandle *_skew_sides[4];
+            RotationCenter *_center;
+        };
+    };
+
+    ControlPoint *_active;
+    Inkscape::CanvasItemGroup *_transform_handle_group;
+    Inkscape::CanvasItemRect *_trans_outline;
+    Mode _mode;
+    bool _in_transform;
+    bool _visible;
+    friend class TransformHandle;
+    friend class RotationCenter;
+};
+
+/** Base class for node transform handles to simplify implementation. */
+class TransformHandle : public ControlPoint
+{
+public:
+    TransformHandle(TransformHandleSet &th, SPAnchorType anchor, Inkscape::CanvasItemCtrlType type);
+    void getNextClosestPoint(bool reverse);
+
+protected:
+    virtual void startTransform() {}
+    virtual void endTransform() {}
+    virtual Geom::Affine computeTransform(Geom::Point const &pos, GdkEventMotion *event) = 0;
+    virtual CommitEvent getCommitEvent() = 0;
+
+    Geom::Affine _last_transform;
+    Geom::Point _origin;
+    TransformHandleSet &_th;
+    std::vector<Inkscape::SnapCandidatePoint> _snap_points;
+    std::vector<Inkscape::SnapCandidatePoint> _unselected_points;
+    std::vector<Inkscape::SnapCandidatePoint> _all_snap_sources_sorted;
+    std::vector<Inkscape::SnapCandidatePoint>::iterator _all_snap_sources_iter;
+
+private:
+    bool grabbed(GdkEventMotion *) override;
+    void dragged(Geom::Point &new_pos, GdkEventMotion *event) override;
+    void ungrabbed(GdkEventButton *) override;
+
+    static ColorSet thandle_cset;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :