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// 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 :
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