Adding upstream version 1.3+ds.upstream/1.3+dsupstream

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

1 files changed, 784 insertions, 0 deletions

diff --git a/src/ui/tool/control-point-selection.cpp b/src/ui/tool/control-point-selection.cpp
new file mode 100644
index 0000000..b94129c
--- /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::Path const &path, bool invert)
+{
+    std::vector<SelectableControlPoint *> out;
+    for (auto _all_point : _all_points) {
+        if (path.winding(*_all_point) % 2 != 0) {
+            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 + Tools::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 :