diff options
Diffstat (limited to 'src/ui/tool/control-point-selection.cpp')
| -rw-r--r-- | src/ui/tool/control-point-selection.cpp | 784 |
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..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 : |