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-rw-r--r--src/ui/tools/pen-tool.cpp2027
1 files changed, 2027 insertions, 0 deletions
diff --git a/src/ui/tools/pen-tool.cpp b/src/ui/tools/pen-tool.cpp
new file mode 100644
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+++ b/src/ui/tools/pen-tool.cpp
@@ -0,0 +1,2027 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * Pen event context implementation.
+ */
+
+/*
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2000 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ * Copyright (C) 2002 Lauris Kaplinski
+ * Copyright (C) 2004 Monash University
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <string>
+
+#include <gdk/gdkkeysyms.h>
+#include <glibmm/i18n.h>
+
+#include <2geom/curves.h>
+
+#include "context-fns.h"
+#include "desktop.h"
+#include "include/macros.h"
+#include "inkscape-application.h" // Undo check
+#include "message-context.h"
+#include "message-stack.h"
+#include "selection-chemistry.h"
+#include "selection.h"
+
+#include "display/curve.h"
+#include "display/control/canvas-item-bpath.h"
+#include "display/control/canvas-item-ctrl.h"
+#include "display/control/canvas-item-curve.h"
+
+#include "object/sp-path.h"
+
+#include "ui/draw-anchor.h"
+#include "ui/shortcuts.h"
+#include "ui/tools/pen-tool.h"
+
+// we include the necessary files for BSpline & Spiro
+#include "live_effects/lpeobject.h"
+#include "live_effects/lpeobject-reference.h"
+#include "live_effects/parameter/path.h"
+
+#define INKSCAPE_LPE_SPIRO_C
+#include "live_effects/lpe-spiro.h"
+
+#include "helper/geom-nodetype.h"
+
+// For handling un-continuous paths:
+#include "inkscape.h"
+
+#include "live_effects/spiro.h"
+
+#define INKSCAPE_LPE_BSPLINE_C
+#include "live_effects/lpe-bspline.h"
+
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+static Geom::Point pen_drag_origin_w(0, 0);
+static bool pen_within_tolerance = false;
+const double HANDLE_CUBIC_GAP = 0.001;
+
+PenTool::PenTool(SPDesktop *desktop, std::string prefs_path, const std::string &cursor_filename)
+ : FreehandBase(desktop, prefs_path, cursor_filename)
+{
+ tablet_enabled = false;
+
+ // Pen indicators (temporary handles shown when adding a new node).
+ c0 = new Inkscape::CanvasItemCtrl(desktop->getCanvasControls(), Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE);
+ c1 = new Inkscape::CanvasItemCtrl(desktop->getCanvasControls(), Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE);
+ c0->set_fill(0x0);
+ c1->set_fill(0x0);
+ c0->hide();
+ c1->hide();
+
+ cl0 = new Inkscape::CanvasItemCurve(desktop->getCanvasControls());
+ cl1 = new Inkscape::CanvasItemCurve(desktop->getCanvasControls());
+ cl0->hide();
+ cl1->hide();
+
+ sp_event_context_read(this, "mode");
+
+ this->anchor_statusbar = false;
+
+ this->setPolylineMode();
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (prefs->getBool("/tools/freehand/pen/selcue")) {
+ this->enableSelectionCue();
+ }
+
+ _desktop_destroy = _desktop->connectDestroy([=](SPDesktop *) { state = State::DEAD; });
+}
+
+PenTool::~PenTool() {
+ _desktop_destroy.disconnect();
+ this->discard_delayed_snap_event();
+
+ if (this->npoints != 0) {
+ // switching context - finish path
+ this->ea = nullptr; // unset end anchor if set (otherwise crashes)
+ if (state != State::DEAD) {
+ _finish(false);
+ }
+ }
+
+ if (this->c0) {
+ delete c0;
+ }
+ if (this->c1) {
+ delete c1;
+ }
+
+ if (this->cl0) {
+ delete cl0;
+ }
+ if (this->cl1) {
+ delete cl1;
+ }
+
+ if (this->waiting_item && this->expecting_clicks_for_LPE > 0) {
+ // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
+ this->waiting_item->removeCurrentPathEffect(false);
+ }
+}
+
+void PenTool::setPolylineMode() {
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ guint mode = prefs->getInt("/tools/freehand/pen/freehand-mode", 0);
+ // change the nodes to make space for bspline mode
+ this->polylines_only = (mode == 3 || mode == 4);
+ this->polylines_paraxial = (mode == 4);
+ this->spiro = (mode == 1);
+ this->bspline = (mode == 2);
+ this->_bsplineSpiroColor();
+ if (!this->green_bpaths.empty()) {
+ this->_redrawAll();
+ }
+}
+
+
+void PenTool::_cancel() {
+ this->num_clicks = 0;
+ this->state = PenTool::STOP;
+ this->_resetColors();
+ c0->hide();
+ c1->hide();
+ cl0->hide();
+ cl1->hide();
+ this->message_context->clear();
+ this->message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
+}
+
+/**
+ * Callback that sets key to value in pen context.
+ */
+void PenTool::set(const Inkscape::Preferences::Entry& val) {
+ Glib::ustring name = val.getEntryName();
+
+ if (name == "mode") {
+ if ( val.getString() == "drag" ) {
+ this->mode = MODE_DRAG;
+ } else {
+ this->mode = MODE_CLICK;
+ }
+ }
+}
+
+bool PenTool::hasWaitingLPE() {
+ // note: waiting_LPE_type is defined in SPDrawContext
+ return (this->waiting_LPE != nullptr ||
+ this->waiting_LPE_type != Inkscape::LivePathEffect::INVALID_LPE);
+}
+
+/**
+ * Snaps new node relative to the previous node.
+ */
+void PenTool::_endpointSnap(Geom::Point &p, guint const state) {
+ // Paraxial kicks in after first line has set the angle (before then it's a free line)
+ bool poly = this->polylines_paraxial && !this->green_curve->is_unset();
+
+ if ((state & GDK_CONTROL_MASK) && !poly) { //CTRL enables angular snapping
+ if (this->npoints > 0) {
+ spdc_endpoint_snap_rotation(this, p, this->p[0], state);
+ } else {
+ std::optional<Geom::Point> origin = std::optional<Geom::Point>();
+ spdc_endpoint_snap_free(this, p, origin, state);
+ }
+ } else {
+ // We cannot use shift here to disable snapping because the shift-key is already used
+ // to toggle the paraxial direction; if the user wants to disable snapping (s)he will
+ // have to use the %-key, the menu, or the snap toolbar
+ if ((this->npoints > 0) && poly) {
+ // snap constrained
+ this->_setToNearestHorizVert(p, state);
+ } else {
+ // snap freely
+ std::optional<Geom::Point> origin = this->npoints > 0 ? this->p[0] : std::optional<Geom::Point>();
+ spdc_endpoint_snap_free(this, p, origin, state); // pass the origin, to allow for perpendicular / tangential snapping
+ }
+ }
+}
+
+/**
+ * Snaps new node's handle relative to the new node.
+ */
+void PenTool::_endpointSnapHandle(Geom::Point &p, guint const state) {
+ g_return_if_fail(( this->npoints == 2 ||
+ this->npoints == 5 ));
+
+ if ((state & GDK_CONTROL_MASK)) { //CTRL enables angular snapping
+ spdc_endpoint_snap_rotation(this, p, this->p[this->npoints - 2], state);
+ } else {
+ if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
+ std::optional<Geom::Point> origin = this->p[this->npoints - 2];
+ spdc_endpoint_snap_free(this, p, origin, state);
+ }
+ }
+}
+
+bool PenTool::item_handler(SPItem* item, GdkEvent* event) {
+ bool ret = false;
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ ret = this->_handleButtonPress(event->button);
+ break;
+ case GDK_BUTTON_RELEASE:
+ ret = this->_handleButtonRelease(event->button);
+ break;
+ default:
+ break;
+ }
+
+ if (!ret) {
+ ret = FreehandBase::item_handler(item, event);
+ }
+
+ return ret;
+}
+
+/**
+ * Callback to handle all pen events.
+ */
+bool PenTool::root_handler(GdkEvent* event) {
+ bool ret = false;
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ ret = this->_handleButtonPress(event->button);
+ break;
+
+ case GDK_MOTION_NOTIFY:
+ ret = this->_handleMotionNotify(event->motion);
+ break;
+
+ case GDK_BUTTON_RELEASE:
+ ret = this->_handleButtonRelease(event->button);
+ break;
+
+ case GDK_2BUTTON_PRESS:
+ ret = this->_handle2ButtonPress(event->button);
+ break;
+
+ case GDK_KEY_PRESS:
+ ret = this->_handleKeyPress(event);
+ break;
+
+ default:
+ break;
+ }
+
+ if (!ret) {
+ ret = FreehandBase::root_handler(event);
+ }
+
+ return ret;
+}
+
+/**
+ * Handle mouse button press event.
+ */
+bool PenTool::_handleButtonPress(GdkEventButton const &bevent) {
+ if (this->events_disabled) {
+ // skip event processing if events are disabled
+ return false;
+ }
+
+ Geom::Point const event_w(bevent.x, bevent.y);
+ Geom::Point event_dt(_desktop->w2d(event_w));
+ //Test whether we hit any anchor.
+ SPDrawAnchor * const anchor = spdc_test_inside(this, event_w);
+
+ //with this we avoid creating a new point over the existing one
+ if(bevent.button != 3 && (this->spiro || this->bspline) && this->npoints > 0 && this->p[0] == this->p[3]){
+ if( anchor && anchor == this->sa && this->green_curve->is_unset()){
+ //remove the following line to avoid having one node on top of another
+ _finishSegment(event_dt, bevent.state);
+ _finish(true);
+ return true;
+ }
+ return false;
+ }
+
+ bool ret = false;
+ if (bevent.button == 1
+ // make sure this is not the last click for a waiting LPE (otherwise we want to finish the path)
+ && this->expecting_clicks_for_LPE != 1) {
+ if (Inkscape::have_viable_layer(_desktop, defaultMessageContext()) == false) {
+ return true;
+ }
+
+ grabCanvasEvents();
+
+ pen_drag_origin_w = event_w;
+ pen_within_tolerance = true;
+
+ switch (this->mode) {
+
+ case PenTool::MODE_CLICK:
+ // In click mode we add point on release
+ switch (this->state) {
+ case PenTool::POINT:
+ case PenTool::CONTROL:
+ case PenTool::CLOSE:
+ break;
+ case PenTool::STOP:
+ // This is allowed, if we just canceled curve
+ this->state = PenTool::POINT;
+ break;
+ default:
+ break;
+ }
+ break;
+ case PenTool::MODE_DRAG:
+ switch (this->state) {
+ case PenTool::STOP:
+ // This is allowed, if we just canceled curve
+ case PenTool::POINT:
+ if (this->npoints == 0) {
+ this->_bsplineSpiroColor();
+ Geom::Point p;
+ if ((bevent.state & GDK_CONTROL_MASK) && (this->polylines_only || this->polylines_paraxial)) {
+ p = event_dt;
+ if (!(bevent.state & GDK_SHIFT_MASK)) {
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+ m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
+ m.unSetup();
+ }
+ spdc_create_single_dot(this, p, "/tools/freehand/pen", bevent.state);
+ ret = true;
+ break;
+ }
+
+ // TODO: Perhaps it would be nicer to rearrange the following case
+ // distinction so that the case of a waiting LPE is treated separately
+
+ // Set start anchor
+
+ this->sa = anchor;
+ if (anchor) {
+ //Put the start overwrite curve always on the same direction
+ if (anchor->start) {
+ this->sa_overwrited = this->sa->curve->create_reverse();
+ } else {
+ this->sa_overwrited = this->sa->curve->copy();
+ }
+ this->_bsplineSpiroStartAnchor(bevent.state & GDK_SHIFT_MASK);
+ }
+ if (anchor && (!this->hasWaitingLPE()|| this->bspline || this->spiro)) {
+ // Adjust point to anchor if needed; if we have a waiting LPE, we need
+ // a fresh path to be created so don't continue an existing one
+ p = anchor->dp;
+ _desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
+ } else {
+ // This is the first click of a new curve; deselect item so that
+ // this curve is not combined with it (unless it is drawn from its
+ // anchor, which is handled by the sibling branch above)
+ Inkscape::Selection * const selection = _desktop->getSelection();
+ if (!(bevent.state & GDK_SHIFT_MASK) || this->hasWaitingLPE()) {
+ // if we have a waiting LPE, we need a fresh path to be created
+ // so don't append to an existing one
+ selection->clear();
+ _desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
+ } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
+ _desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
+ }
+
+ // Create green anchor
+ p = event_dt;
+ this->_endpointSnap(p, bevent.state);
+ this->green_anchor.reset(new SPDrawAnchor(this, this->green_curve.get(), true, p));
+ }
+ this->_setInitialPoint(p);
+ } else {
+ // Set end anchor
+ this->ea = anchor;
+ Geom::Point p;
+ if (anchor) {
+ p = anchor->dp;
+ // we hit an anchor, will finish the curve (either with or without closing)
+ // in release handler
+ this->state = PenTool::CLOSE;
+
+ if (this->green_anchor && this->green_anchor->active) {
+ // we clicked on the current curve start, so close it even if
+ // we drag a handle away from it
+ this->green_closed = true;
+ }
+ ret = true;
+ break;
+
+ } else {
+ p = event_dt;
+ this->_endpointSnap(p, bevent.state); // Snap node only if not hitting anchor.
+ this->_setSubsequentPoint(p, true);
+ }
+ }
+ // avoid the creation of a control point so a node is created in the release event
+ this->state = (this->spiro || this->bspline || this->polylines_only) ? PenTool::POINT : PenTool::CONTROL;
+ ret = true;
+ break;
+ case PenTool::CONTROL:
+ g_warning("Button down in CONTROL state");
+ break;
+ case PenTool::CLOSE:
+ g_warning("Button down in CLOSE state");
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ } else if (this->expecting_clicks_for_LPE == 1 && this->npoints != 0) {
+ // when the last click for a waiting LPE occurs we want to finish the path
+ this->_finishSegment(event_dt, bevent.state);
+ if (this->green_closed) {
+ // finishing at the start anchor, close curve
+ this->_finish(true);
+ } else {
+ // finishing at some other anchor, finish curve but not close
+ this->_finish(false);
+ }
+
+ ret = true;
+ } else if (bevent.button == 3 && this->npoints != 0 && !_button1on) {
+ // right click - finish path, but only if the left click isn't pressed.
+ this->ea = nullptr; // unset end anchor if set (otherwise crashes)
+ this->_finish(false);
+ ret = true;
+ }
+
+ if (this->expecting_clicks_for_LPE > 0) {
+ --this->expecting_clicks_for_LPE;
+ }
+
+ return ret;
+}
+
+/**
+ * Handle motion_notify event.
+ */
+bool PenTool::_handleMotionNotify(GdkEventMotion const &mevent) {
+ bool ret = false;
+
+ if (mevent.state & GDK_BUTTON2_MASK) {
+ // allow scrolling
+ return false;
+ }
+
+ if (this->events_disabled) {
+ // skip motion events if pen events are disabled
+ return false;
+ }
+
+ Geom::Point const event_w(mevent.x, mevent.y);
+
+ //we take out the function the const "tolerance" because we need it later
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+
+ if (pen_within_tolerance) {
+ if ( Geom::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
+ return false; // Do not drag if we're within tolerance from origin.
+ }
+ }
+ // Once the user has moved farther than tolerance from the original location
+ // (indicating they intend to move the object, not click), then always process the
+ // motion notify coordinates as given (no snapping back to origin)
+ pen_within_tolerance = false;
+
+ // Find desktop coordinates
+ Geom::Point p = _desktop->w2d(event_w);
+
+ // Test, whether we hit any anchor
+ SPDrawAnchor *anchor = spdc_test_inside(this, event_w);
+
+ switch (this->mode) {
+ case PenTool::MODE_CLICK:
+ switch (this->state) {
+ case PenTool::POINT:
+ if ( this->npoints != 0 ) {
+ // Only set point, if we are already appending
+ this->_endpointSnap(p, mevent.state);
+ this->_setSubsequentPoint(p, true);
+ ret = true;
+ } else if (!this->sp_event_context_knot_mouseover()) {
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+ m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+ m.unSetup();
+ }
+ break;
+ case PenTool::CONTROL:
+ case PenTool::CLOSE:
+ // Placing controls is last operation in CLOSE state
+ this->_endpointSnap(p, mevent.state);
+ this->_setCtrl(p, mevent.state);
+ ret = true;
+ break;
+ case PenTool::STOP:
+ if (!this->sp_event_context_knot_mouseover()) {
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+ m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+ m.unSetup();
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ case PenTool::MODE_DRAG:
+ switch (this->state) {
+ case PenTool::POINT:
+ if ( this->npoints > 0 ) {
+ // Only set point, if we are already appending
+
+ if (!anchor) { // Snap node only if not hitting anchor
+ this->_endpointSnap(p, mevent.state);
+ this->_setSubsequentPoint(p, true, mevent.state);
+ } else {
+ this->_setSubsequentPoint(anchor->dp, false, mevent.state);
+ }
+
+ if (anchor && !this->anchor_statusbar) {
+ if(!this->spiro && !this->bspline){
+ this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
+ }else{
+ this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path. Shift+Click make a cusp node"));
+ }
+ this->anchor_statusbar = true;
+ } else if (!anchor && this->anchor_statusbar) {
+ this->message_context->clear();
+ this->anchor_statusbar = false;
+ }
+
+ ret = true;
+ } else {
+ if (anchor && !this->anchor_statusbar) {
+ if(!this->spiro && !this->bspline){
+ this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
+ }else{
+ this->message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point. Shift+Click make a cusp node"));
+ }
+ this->anchor_statusbar = true;
+ } else if (!anchor && this->anchor_statusbar) {
+ this->message_context->clear();
+ this->anchor_statusbar = false;
+
+ }
+ if (!this->sp_event_context_knot_mouseover()) {
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+ m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+ m.unSetup();
+ }
+ }
+ break;
+ case PenTool::CONTROL:
+ case PenTool::CLOSE:
+ // Placing controls is last operation in CLOSE state
+
+ // snap the handle
+
+ this->_endpointSnapHandle(p, mevent.state);
+
+ if (!this->polylines_only) {
+ this->_setCtrl(p, mevent.state);
+ } else {
+ this->_setCtrl(this->p[1], mevent.state);
+ }
+
+ gobble_motion_events(GDK_BUTTON1_MASK);
+ ret = true;
+ break;
+ case PenTool::STOP:
+ // Don't break; fall through to default to do preSnapping
+ default:
+ if (!this->sp_event_context_knot_mouseover()) {
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+ m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
+ m.unSetup();
+ }
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ // calls the function "bspline_spiro_motion" when the mouse starts or stops moving
+ if(this->bspline){
+ this->_bsplineSpiroMotion(mevent.state);
+ }else{
+ if ( Geom::LInfty( event_w - pen_drag_origin_w ) > (tolerance/2) || mevent.time == 0) {
+ this->_bsplineSpiroMotion(mevent.state);
+ pen_drag_origin_w = event_w;
+ }
+ }
+
+ return ret;
+}
+
+/**
+ * Handle mouse button release event.
+ */
+bool PenTool::_handleButtonRelease(GdkEventButton const &revent) {
+ if (this->events_disabled) {
+ // skip event processing if events are disabled
+ return false;
+ }
+
+ bool ret = false;
+
+ if (revent.button == 1) {
+ Geom::Point const event_w(revent.x, revent.y);
+
+ // Find desktop coordinates
+ Geom::Point p = _desktop->w2d(event_w);
+
+ // Test whether we hit any anchor.
+
+ SPDrawAnchor *anchor = spdc_test_inside(this, event_w);
+ // if we try to create a node in the same place as another node, we skip
+ if((!anchor || anchor == this->sa) && (this->spiro || this->bspline) && this->npoints > 0 && this->p[0] == this->p[3]){
+ return true;
+ }
+
+ switch (this->mode) {
+ case PenTool::MODE_CLICK:
+ switch (this->state) {
+ case PenTool::POINT:
+ this->ea = anchor;
+ if (anchor) {
+ p = anchor->dp;
+ }
+ this->state = PenTool::CONTROL;
+ break;
+ case PenTool::CONTROL:
+ // End current segment
+ this->_endpointSnap(p, revent.state);
+ this->_finishSegment(p, revent.state);
+ this->state = PenTool::POINT;
+ break;
+ case PenTool::CLOSE:
+ // End current segment
+ if (!anchor) { // Snap node only if not hitting anchor
+ this->_endpointSnap(p, revent.state);
+ }
+ this->_finishSegment(p, revent.state);
+ // hude the guide of the penultimate node when closing the curve
+ if(this->spiro){
+ c1->hide();
+ }
+ this->_finish(true);
+ this->state = PenTool::POINT;
+ break;
+ case PenTool::STOP:
+ // This is allowed, if we just canceled curve
+ this->state = PenTool::POINT;
+ break;
+ default:
+ break;
+ }
+ break;
+ case PenTool::MODE_DRAG:
+ switch (this->state) {
+ case PenTool::POINT:
+ case PenTool::CONTROL:
+ this->_endpointSnap(p, revent.state);
+ this->_finishSegment(p, revent.state);
+ break;
+ case PenTool::CLOSE:
+ this->_endpointSnap(p, revent.state);
+ this->_finishSegment(p, revent.state);
+ // hide the penultimate node guide when closing the curve
+ if(this->spiro){
+ c1->hide();
+ }
+ if (this->green_closed) {
+ // finishing at the start anchor, close curve
+ this->_finish(true);
+ } else {
+ // finishing at some other anchor, finish curve but not close
+ this->_finish(false);
+ }
+ break;
+ case PenTool::STOP:
+ // This is allowed, if we just cancelled curve
+ break;
+ default:
+ break;
+ }
+ this->state = PenTool::POINT;
+ break;
+ default:
+ break;
+ }
+
+ ungrabCanvasEvents();
+
+ ret = true;
+
+ this->green_closed = false;
+ }
+
+ // TODO: can we be sure that the path was created correctly?
+ // TODO: should we offer an option to collect the clicks in a list?
+ if (this->expecting_clicks_for_LPE == 0 && this->hasWaitingLPE()) {
+ this->setPolylineMode();
+
+ Inkscape::Selection *selection = _desktop->getSelection();
+
+ if (this->waiting_LPE) {
+ // we have an already created LPE waiting for a path
+ this->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
+ selection->add(this->waiting_item);
+ this->waiting_LPE = nullptr;
+ } else {
+ // the case that we need to create a new LPE and apply it to the just-drawn path is
+ // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
+ }
+ }
+
+ return ret;
+}
+
+bool PenTool::_handle2ButtonPress(GdkEventButton const &bevent) {
+ bool ret = false;
+ // only end on LMB double click. Otherwise horizontal scrolling causes ending of the path
+ if (this->npoints != 0 && bevent.button == 1 && this->state != PenTool::CLOSE) {
+ this->_finish(false);
+ ret = true;
+ }
+ return ret;
+}
+
+void PenTool::_redrawAll() {
+ // green
+ if (! this->green_bpaths.empty()) {
+ // remove old piecewise green canvasitems
+ for (auto path : this->green_bpaths) {
+ delete path;
+ }
+ this->green_bpaths.clear();
+
+ // one canvas bpath for all of green_curve
+ auto canvas_shape = new Inkscape::CanvasItemBpath(_desktop->getCanvasSketch(), green_curve.get(), true);
+ canvas_shape->set_stroke(green_color);
+ canvas_shape->set_fill(0x0, SP_WIND_RULE_NONZERO);
+ this->green_bpaths.push_back(canvas_shape);
+ }
+ if (this->green_anchor) {
+ this->green_anchor->ctrl->set_position(this->green_anchor->dp);
+ }
+
+ this->red_curve->reset();
+ this->red_curve->moveto(this->p[0]);
+ this->red_curve->curveto(this->p[1], this->p[2], this->p[3]);
+ red_bpath->set_bpath(red_curve.get(), true);
+
+ // handles
+ // hide the handlers in bspline and spiro modes
+ if (this->p[0] != this->p[1] && !this->spiro && !this->bspline) {
+ c1->set_position(p[1]);
+ c1->show();
+ cl1->set_coords(p[0], p[1]);
+ cl1->show();
+ } else {
+ c1->hide();
+ cl1->hide();
+ }
+
+ Geom::Curve const * last_seg = this->green_curve->last_segment();
+ if (last_seg) {
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
+ // hide the handlers in bspline and spiro modes
+ if ( cubic &&
+ (*cubic)[2] != this->p[0] && !this->spiro && !this->bspline )
+ {
+ Geom::Point p2 = (*cubic)[2];
+ c0->set_position(p2);
+ c0->show();
+ cl0->set_coords(p2, p[0]);
+ cl0->show();
+ } else {
+ c0->hide();
+ cl0->hide();
+ }
+ }
+
+ // simply redraw the spiro. because its a redrawing, we don't call the global function,
+ // but we call the redrawing at the ending.
+ this->_bsplineSpiroBuild();
+}
+
+void PenTool::_lastpointMove(gdouble x, gdouble y) {
+ if (this->npoints != 5)
+ return;
+
+ y *= -_desktop->yaxisdir();
+
+ // green
+ if (!this->green_curve->is_unset()) {
+ this->green_curve->last_point_additive_move( Geom::Point(x,y) );
+ } else {
+ // start anchor too
+ if (this->green_anchor) {
+ this->green_anchor->dp += Geom::Point(x, y);
+ }
+ }
+
+ // red
+
+ this->p[0] += Geom::Point(x, y);
+ this->p[1] += Geom::Point(x, y);
+ this->_redrawAll();
+}
+
+void PenTool::_lastpointMoveScreen(gdouble x, gdouble y) {
+ this->_lastpointMove(x / _desktop->current_zoom(), y / _desktop->current_zoom());
+}
+
+void PenTool::_lastpointToCurve() {
+ // avoid that if the "red_curve" contains only two points ( rect ), it doesn't stop here.
+ if (this->npoints != 5 && !this->spiro && !this->bspline)
+ return;
+
+ this->p[1] = this->red_curve->last_segment()->initialPoint() + (1./3.)*(*this->red_curve->last_point() - this->red_curve->last_segment()->initialPoint());
+ //modificate the last segment of the green curve so it creates the type of node we need
+ if (this->spiro||this->bspline) {
+ if (!this->green_curve->is_unset()) {
+ Geom::Point A(0,0);
+ Geom::Point B(0,0);
+ Geom::Point C(0,0);
+ Geom::Point D(0,0);
+ Geom::CubicBezier const *cubic = dynamic_cast<Geom::CubicBezier const *>( this->green_curve->last_segment() );
+ //We obtain the last segment 4 points in the previous curve
+ if ( cubic ){
+ A = (*cubic)[0];
+ B = (*cubic)[1];
+ if (this->spiro) {
+ C = this->p[0] + (this->p[0] - this->p[1]);
+ } else {
+ C = *this->green_curve->last_point() + (1./3.)*(this->green_curve->last_segment()->initialPoint() - *this->green_curve->last_point());
+ }
+ D = (*cubic)[3];
+ } else {
+ A = this->green_curve->last_segment()->initialPoint();
+ B = this->green_curve->last_segment()->initialPoint();
+ if (this->spiro) {
+ C = this->p[0] + (this->p[0] - this->p[1]);
+ } else {
+ C = *this->green_curve->last_point() + (1./3.)*(this->green_curve->last_segment()->initialPoint() - *this->green_curve->last_point());
+ }
+ D = *this->green_curve->last_point();
+ }
+ auto previous = std::make_unique<SPCurve>();
+ previous->moveto(A);
+ previous->curveto(B, C, D);
+ if ( this->green_curve->get_segment_count() == 1) {
+ this->green_curve = std::move(previous);
+ } else {
+ //we eliminate the last segment
+ this->green_curve->backspace();
+ //and we add it again with the recreation
+ green_curve->append_continuous(*previous);
+ }
+ }
+ //if the last node is an union with another curve
+ if (this->green_curve->is_unset() && this->sa && !this->sa->curve->is_unset()) {
+ this->_bsplineSpiroStartAnchor(false);
+ }
+ }
+
+ this->_redrawAll();
+}
+
+
+void PenTool::_lastpointToLine() {
+ // avoid that if the "red_curve" contains only two points ( rect) it doesn't stop here.
+ if (this->npoints != 5 && !this->bspline)
+ return;
+
+ // modify the last segment of the green curve so the type of node we want is created.
+ if(this->spiro || this->bspline){
+ if(!this->green_curve->is_unset()){
+ Geom::Point A(0,0);
+ Geom::Point B(0,0);
+ Geom::Point C(0,0);
+ Geom::Point D(0,0);
+ auto previous = std::make_unique<SPCurve>();
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( this->green_curve->last_segment() );
+ if ( cubic ) {
+ A = this->green_curve->last_segment()->initialPoint();
+ B = (*cubic)[1];
+ C = *this->green_curve->last_point();
+ D = C;
+ } else {
+ //We obtain the last segment 4 points in the previous curve
+ A = this->green_curve->last_segment()->initialPoint();
+ B = A;
+ C = *this->green_curve->last_point();
+ D = C;
+ }
+ previous->moveto(A);
+ previous->curveto(B, C, D);
+ if( this->green_curve->get_segment_count() == 1){
+ this->green_curve = std::move(previous);
+ }else{
+ //we eliminate the last segment
+ this->green_curve->backspace();
+ //and we add it again with the recreation
+ green_curve->append_continuous(*previous);
+ }
+ }
+ // if the last node is an union with another curve
+ if(this->green_curve->is_unset() && this->sa && !this->sa->curve->is_unset()){
+ this->_bsplineSpiroStartAnchor(true);
+ }
+ }
+
+ this->p[1] = this->p[0];
+ this->_redrawAll();
+}
+
+
+bool PenTool::_handleKeyPress(GdkEvent *event) {
+ bool ret = false;
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000, "px"); // in px
+
+ // Check for undo if we have started drawing a path. User might have change shortcut.
+ if (this->npoints > 0) {
+ Gtk::AccelKey shortcut = Inkscape::Shortcuts::get_from_event((GdkEventKey*)event);
+ auto app = InkscapeApplication::instance();
+ auto gapp = app->gtk_app();
+ auto actions = gapp->get_actions_for_accel(shortcut.get_abbrev());
+ if (std::find(actions.begin(), actions.end(), "win.undo") != actions.end()) {
+ return _undoLastPoint();
+ }
+ }
+
+ switch (get_latin_keyval (&event->key)) {
+ case GDK_KEY_Left: // move last point left
+ case GDK_KEY_KP_Left:
+ if (!MOD__CTRL(event)) { // not ctrl
+ if (MOD__ALT(event)) { // alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMoveScreen(-10, 0); // shift
+ }
+ else {
+ this->_lastpointMoveScreen(-1, 0); // no shift
+ }
+ }
+ else { // no alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMove(-10*nudge, 0); // shift
+ }
+ else {
+ this->_lastpointMove(-nudge, 0); // no shift
+ }
+ }
+ ret = true;
+ }
+ break;
+ case GDK_KEY_Up: // move last point up
+ case GDK_KEY_KP_Up:
+ if (!MOD__CTRL(event)) { // not ctrl
+ if (MOD__ALT(event)) { // alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMoveScreen(0, 10); // shift
+ }
+ else {
+ this->_lastpointMoveScreen(0, 1); // no shift
+ }
+ }
+ else { // no alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMove(0, 10*nudge); // shift
+ }
+ else {
+ this->_lastpointMove(0, nudge); // no shift
+ }
+ }
+ ret = true;
+ }
+ break;
+ case GDK_KEY_Right: // move last point right
+ case GDK_KEY_KP_Right:
+ if (!MOD__CTRL(event)) { // not ctrl
+ if (MOD__ALT(event)) { // alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMoveScreen(10, 0); // shift
+ }
+ else {
+ this->_lastpointMoveScreen(1, 0); // no shift
+ }
+ }
+ else { // no alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMove(10*nudge, 0); // shift
+ }
+ else {
+ this->_lastpointMove(nudge, 0); // no shift
+ }
+ }
+ ret = true;
+ }
+ break;
+ case GDK_KEY_Down: // move last point down
+ case GDK_KEY_KP_Down:
+ if (!MOD__CTRL(event)) { // not ctrl
+ if (MOD__ALT(event)) { // alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMoveScreen(0, -10); // shift
+ }
+ else {
+ this->_lastpointMoveScreen(0, -1); // no shift
+ }
+ }
+ else { // no alt
+ if (MOD__SHIFT(event)) {
+ this->_lastpointMove(0, -10*nudge); // shift
+ }
+ else {
+ this->_lastpointMove(0, -nudge); // no shift
+ }
+ }
+ ret = true;
+ }
+ break;
+
+/*TODO: this is not yet enabled?? looks like some traces of the Geometry tool
+ case GDK_KEY_P:
+ case GDK_KEY_p:
+ if (MOD__SHIFT_ONLY(event)) {
+ sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
+ ret = true;
+ }
+ break;
+
+ case GDK_KEY_C:
+ case GDK_KEY_c:
+ if (MOD__SHIFT_ONLY(event)) {
+ sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
+ ret = true;
+ }
+ break;
+
+ case GDK_KEY_B:
+ case GDK_KEY_b:
+ if (MOD__SHIFT_ONLY(event)) {
+ sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
+ ret = true;
+ }
+ break;
+
+ case GDK_KEY_A:
+ case GDK_KEY_a:
+ if (MOD__SHIFT_ONLY(event)) {
+ sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
+ ret = true;
+ }
+ break;
+*/
+
+ case GDK_KEY_U:
+ case GDK_KEY_u:
+ if (MOD__SHIFT_ONLY(event)) {
+ this->_lastpointToCurve();
+ ret = true;
+ }
+ break;
+ case GDK_KEY_L:
+ case GDK_KEY_l:
+ if (MOD__SHIFT_ONLY(event)) {
+ this->_lastpointToLine();
+ ret = true;
+ }
+ break;
+
+ case GDK_KEY_Return:
+ case GDK_KEY_KP_Enter:
+ if (this->npoints != 0) {
+ this->ea = nullptr; // unset end anchor if set (otherwise crashes)
+ if(MOD__SHIFT_ONLY(event)) {
+ // All this is needed to stop the last control
+ // point dispeating and stop making an n-1 shape.
+ Geom::Point const p(0, 0);
+ if(this->red_curve->is_unset()) {
+ this->red_curve->moveto(p);
+ }
+ this->_finishSegment(p, 0);
+ this->_finish(true);
+ } else {
+ this->_finish(false);
+ }
+ ret = true;
+ }
+ break;
+ case GDK_KEY_Escape:
+ if (this->npoints != 0) {
+ // if drawing, cancel, otherwise pass it up for deselecting
+ this->_cancel ();
+ ret = true;
+ }
+ break;
+ case GDK_KEY_g:
+ case GDK_KEY_G:
+ if (MOD__SHIFT_ONLY(event)) {
+ _desktop->selection->toGuides();
+ ret = true;
+ }
+ break;
+ case GDK_KEY_BackSpace:
+ case GDK_KEY_Delete:
+ case GDK_KEY_KP_Delete:
+ ret = _undoLastPoint();
+ break;
+ case GDK_KEY_Z:
+ case GDK_KEY_z:
+ if (event->key.state & INK_GDK_PRIMARY_MASK) {
+ ret = _undoLastPoint();
+ }
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+void PenTool::_resetColors() {
+ // Red
+ this->red_curve->reset();
+ this->red_bpath->set_bpath(nullptr);
+
+ // Blue
+ this->blue_curve->reset();
+ this->blue_bpath->set_bpath(nullptr);
+
+ // Green
+ for (auto path : this->green_bpaths) {
+ delete path;
+ }
+ this->green_bpaths.clear();
+ this->green_curve->reset();
+ this->green_anchor.reset();
+
+ this->sa = nullptr;
+ this->ea = nullptr;
+
+ if (this->sa_overwrited) {
+ this->sa_overwrited->reset();
+ }
+
+ this->npoints = 0;
+ this->red_curve_is_valid = false;
+}
+
+
+void PenTool::_setInitialPoint(Geom::Point const p) {
+ g_assert( this->npoints == 0 );
+
+ this->p[0] = p;
+ this->p[1] = p;
+ this->npoints = 2;
+ this->red_bpath->set_bpath(nullptr);
+}
+
+/**
+ * Show the status message for the current line/curve segment.
+ * This type of message always shows angle/distance as the last
+ * two parameters ("angle %3.2f&#176;, distance %s").
+ */
+void PenTool::_setAngleDistanceStatusMessage(Geom::Point const p, int pc_point_to_compare, gchar const *message) {
+ g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
+ g_assert(message != nullptr);
+
+ Geom::Point rel = p - this->p[pc_point_to_compare];
+ Inkscape::Util::Quantity q = Inkscape::Util::Quantity(Geom::L2(rel), "px");
+ Glib::ustring dist = q.string(_desktop->namedview->display_units);
+ double angle = atan2(rel[Geom::Y], rel[Geom::X]) * 180 / M_PI;
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (prefs->getBool("/options/compassangledisplay/value", false) != 0) {
+ angle = 90 - angle;
+
+ if (_desktop->is_yaxisdown()) {
+ angle = 180 - angle;
+ }
+
+ if (angle < 0) {
+ angle += 360;
+ }
+ }
+
+ this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist.c_str());
+}
+
+// this function changes the colors red, green and blue making them transparent or not, depending on if spiro is being used.
+void PenTool::_bsplineSpiroColor()
+{
+ static Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (this->spiro){
+ this->red_color = 0xff000000;
+ this->green_color = 0x00ff0000;
+ } else if(this->bspline) {
+ this->highlight_color = currentLayer()->highlight_color();
+ if((unsigned int)prefs->getInt("/tools/nodes/highlight_color", 0xff0000ff) == this->highlight_color){
+ this->green_color = 0xff00007f;
+ this->red_color = 0xff00007f;
+ } else {
+ this->green_color = this->highlight_color;
+ this->red_color = this->highlight_color;
+ }
+ } else {
+ this->highlight_color = currentLayer()->highlight_color();
+ this->red_color = 0xff00007f;
+ if((unsigned int)prefs->getInt("/tools/nodes/highlight_color", 0xff0000ff) == this->highlight_color){
+ this->green_color = 0x00ff007f;
+ } else {
+ this->green_color = this->highlight_color;
+ }
+ blue_bpath->hide();
+ }
+
+ //We erase all the "green_bpaths" to recreate them after with the colour
+ //transparency recently modified
+ if (!this->green_bpaths.empty()) {
+ // remove old piecewise green canvasitems
+ for (auto path : this->green_bpaths) {
+ delete path;
+ }
+ this->green_bpaths.clear();
+
+ // one canvas bpath for all of green_curve
+ auto canvas_shape = new Inkscape::CanvasItemBpath(_desktop->getCanvasSketch(), green_curve.get(), true);
+ canvas_shape->set_stroke(green_color);
+ canvas_shape->set_fill(0x0, SP_WIND_RULE_NONZERO);
+ this->green_bpaths.push_back(canvas_shape);
+ }
+
+ this->red_bpath->set_stroke(red_color);
+}
+
+
+void PenTool::_bsplineSpiro(bool shift)
+{
+ if(!this->spiro && !this->bspline){
+ return;
+ }
+
+ shift?this->_bsplineSpiroOff():this->_bsplineSpiroOn();
+ this->_bsplineSpiroBuild();
+}
+
+void PenTool::_bsplineSpiroOn()
+{
+ if(!this->red_curve->is_unset()){
+ using Geom::X;
+ using Geom::Y;
+ this->npoints = 5;
+ this->p[0] = *this->red_curve->first_point();
+ this->p[3] = this->red_curve->first_segment()->finalPoint();
+ this->p[2] = this->p[3] + (1./3)*(this->p[0] - this->p[3]);
+ this->p[2] = Geom::Point(this->p[2][X] + HANDLE_CUBIC_GAP,this->p[2][Y] + HANDLE_CUBIC_GAP);
+ }
+}
+
+void PenTool::_bsplineSpiroOff()
+{
+ if(!this->red_curve->is_unset()){
+ this->npoints = 5;
+ this->p[0] = *this->red_curve->first_point();
+ this->p[3] = this->red_curve->first_segment()->finalPoint();
+ this->p[2] = this->p[3];
+ }
+}
+
+void PenTool::_bsplineSpiroStartAnchor(bool shift)
+{
+ if(this->sa->curve->is_unset()){
+ return;
+ }
+
+ LivePathEffect::LPEBSpline *lpe_bsp = nullptr;
+
+ if (SP_IS_LPE_ITEM(this->white_item) && SP_LPE_ITEM(this->white_item)->hasPathEffect()){
+ Inkscape::LivePathEffect::Effect *thisEffect =
+ SP_LPE_ITEM(this->white_item)->getFirstPathEffectOfType(Inkscape::LivePathEffect::BSPLINE);
+ if(thisEffect){
+ lpe_bsp = dynamic_cast<LivePathEffect::LPEBSpline*>(thisEffect->getLPEObj()->get_lpe());
+ }
+ }
+ if(lpe_bsp){
+ this->bspline = true;
+ }else{
+ this->bspline = false;
+ }
+ LivePathEffect::LPESpiro *lpe_spi = nullptr;
+
+ if (SP_IS_LPE_ITEM(this->white_item) && SP_LPE_ITEM(this->white_item)->hasPathEffect()){
+ Inkscape::LivePathEffect::Effect *thisEffect =
+ SP_LPE_ITEM(this->white_item)->getFirstPathEffectOfType(Inkscape::LivePathEffect::SPIRO);
+ if(thisEffect){
+ lpe_spi = dynamic_cast<LivePathEffect::LPESpiro*>(thisEffect->getLPEObj()->get_lpe());
+ }
+ }
+ if(lpe_spi){
+ this->spiro = true;
+ }else{
+ this->spiro = false;
+ }
+ if(!this->spiro && !this->bspline){
+ _bsplineSpiroColor();
+ return;
+ }
+ if(shift){
+ this->_bsplineSpiroStartAnchorOff();
+ } else {
+ this->_bsplineSpiroStartAnchorOn();
+ }
+}
+
+void PenTool::_bsplineSpiroStartAnchorOn()
+{
+ using Geom::X;
+ using Geom::Y;
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*this->sa_overwrited ->last_segment());
+ auto last_segment = std::make_unique<SPCurve>();
+ Geom::Point point_a = this->sa_overwrited->last_segment()->initialPoint();
+ Geom::Point point_d = *this->sa_overwrited->last_point();
+ Geom::Point point_c = point_d + (1./3)*(point_a - point_d);
+ point_c = Geom::Point(point_c[X] + HANDLE_CUBIC_GAP, point_c[Y] + HANDLE_CUBIC_GAP);
+ if(cubic){
+ last_segment->moveto(point_a);
+ last_segment->curveto((*cubic)[1],point_c,point_d);
+ }else{
+ last_segment->moveto(point_a);
+ last_segment->curveto(point_a,point_c,point_d);
+ }
+ if( this->sa_overwrited->get_segment_count() == 1){
+ this->sa_overwrited = std::move(last_segment);
+ }else{
+ //we eliminate the last segment
+ this->sa_overwrited->backspace();
+ //and we add it again with the recreation
+ sa_overwrited->append_continuous(*last_segment);
+ }
+}
+
+void PenTool::_bsplineSpiroStartAnchorOff()
+{
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*this->sa_overwrited->last_segment());
+ if(cubic){
+ auto last_segment = std::make_unique<SPCurve>();
+ last_segment->moveto((*cubic)[0]);
+ last_segment->curveto((*cubic)[1],(*cubic)[3],(*cubic)[3]);
+ if( this->sa_overwrited->get_segment_count() == 1){
+ this->sa_overwrited = std::move(last_segment);
+ }else{
+ //we eliminate the last segment
+ this->sa_overwrited->backspace();
+ //and we add it again with the recreation
+ sa_overwrited->append_continuous(*last_segment);
+ }
+ }
+}
+
+void PenTool::_bsplineSpiroMotion(guint const state){
+ bool shift = state & GDK_SHIFT_MASK;
+ if(!this->spiro && !this->bspline){
+ return;
+ }
+ using Geom::X;
+ using Geom::Y;
+ if(this->red_curve->is_unset()) return;
+ this->npoints = 5;
+ std::unique_ptr<SPCurve> tmp_curve(new SPCurve());
+ this->p[2] = this->p[3] + (1./3)*(this->p[0] - this->p[3]);
+ this->p[2] = Geom::Point(this->p[2][X] + HANDLE_CUBIC_GAP,this->p[2][Y] + HANDLE_CUBIC_GAP);
+ if (this->green_curve->is_unset() && !this->sa) {
+ this->p[1] = this->p[0] + (1./3)*(this->p[3] - this->p[0]);
+ this->p[1] = Geom::Point(this->p[1][X] + HANDLE_CUBIC_GAP, this->p[1][Y] + HANDLE_CUBIC_GAP);
+ if(shift){
+ this->p[2] = this->p[3];
+ }
+ } else if (!this->green_curve->is_unset()){
+ tmp_curve = this->green_curve->copy();
+ } else {
+ tmp_curve = this->sa_overwrited->copy();
+ }
+ if ((state & GDK_MOD1_MASK ) && previous != Geom::Point(0,0)) { //ALT drag
+ this->p[0] = this->p[0] + (this->p[3] - previous);
+ }
+ if(!tmp_curve ->is_unset()){
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*tmp_curve ->last_segment());
+ if ((state & GDK_MOD1_MASK ) &&
+ !Geom::are_near(*tmp_curve ->last_point(), this->p[0], 0.1))
+ {
+ auto previous_weight_power = std::make_unique<SPCurve>();
+ Geom::D2< Geom::SBasis > SBasisweight_power;
+ previous_weight_power->moveto(tmp_curve ->last_segment()->initialPoint());
+ previous_weight_power->lineto(this->p[0]);
+ SBasisweight_power = previous_weight_power->first_segment()->toSBasis();
+ if( tmp_curve ->get_segment_count() == 1){
+ Geom::Point initial = tmp_curve ->last_segment()->initialPoint();
+ tmp_curve->reset();
+ tmp_curve->moveto(initial);
+ }else{
+ tmp_curve->backspace();
+ }
+ if(this->bspline && cubic && !Geom::are_near((*cubic)[2],(*cubic)[3])){
+ tmp_curve->curveto(SBasisweight_power.valueAt(0.33334), SBasisweight_power.valueAt(0.66667), this->p[0]);
+ } else if(this->bspline && cubic) {
+ tmp_curve->curveto(SBasisweight_power.valueAt(0.33334), this->p[0], this->p[0]);
+ } else if (cubic && !Geom::are_near((*cubic)[2],(*cubic)[3])) {
+ tmp_curve->curveto((*cubic)[1], (*cubic)[2] + (this->p[3] - previous), this->p[0]);
+ } else if (cubic){
+ tmp_curve->curveto((*cubic)[1], this->p[0], this->p[0]);
+ } else {
+ tmp_curve->lineto(this->p[0]);
+ }
+ cubic = dynamic_cast<Geom::CubicBezier const*>(&*tmp_curve ->last_segment());
+ if (this->sa && this->green_curve->is_unset()) {
+ this->sa_overwrited = tmp_curve->copy();
+ }
+ this->green_curve = tmp_curve->copy();
+ }
+ if (cubic) {
+ if (this->bspline) {
+ auto weight_power = std::make_unique<SPCurve>();
+ Geom::D2< Geom::SBasis > SBasisweight_power;
+ weight_power->moveto(this->red_curve->last_segment()->initialPoint());
+ weight_power->lineto(*this->red_curve->last_point());
+ SBasisweight_power = weight_power->first_segment()->toSBasis();
+ this->p[1] = SBasisweight_power.valueAt(0.33334);
+ if(!Geom::are_near(this->p[1],this->p[0])){
+ this->p[1] = Geom::Point(this->p[1][X] + HANDLE_CUBIC_GAP,this->p[1][Y] + HANDLE_CUBIC_GAP);
+ } else {
+ this->p[1] = this->p[0];
+ }
+ if (shift) {
+ this->p[2] = this->p[3];
+ }
+ if(Geom::are_near((*cubic)[3], (*cubic)[2])) {
+ this->p[1] = this->p[0];
+ }
+ } else {
+ this->p[1] = (*cubic)[3] + ((*cubic)[3] - (*cubic)[2] );
+ }
+ } else {
+ this->p[1] = this->p[0];
+ if (shift) {
+ this->p[2] = this->p[3];
+ }
+ }
+ previous = *this->red_curve->last_point();
+ auto red = std::make_unique<SPCurve>();
+ red->moveto(this->p[0]);
+ red->curveto(this->p[1],this->p[2],this->p[3]);
+ this->red_bpath->set_bpath(red.get(), true);
+ }
+
+ if(this->anchor_statusbar && !this->red_curve->is_unset()){
+ if(shift){
+ this->_bsplineSpiroEndAnchorOff();
+ }else{
+ this->_bsplineSpiroEndAnchorOn();
+ }
+ }
+
+ // remove old piecewise green canvasitems
+ for (auto path: this->green_bpaths) {
+ delete path;
+ }
+ this->green_bpaths.clear();
+
+ // one canvas bpath for all of green_curve
+ auto canvas_shape = new Inkscape::CanvasItemBpath(_desktop->getCanvasSketch(), green_curve.get(), true);
+ canvas_shape->set_stroke(green_color);
+ canvas_shape->set_fill(0x0, SP_WIND_RULE_NONZERO);
+ this->green_bpaths.push_back(canvas_shape);
+
+ this->_bsplineSpiroBuild();
+}
+
+void PenTool::_bsplineSpiroEndAnchorOn()
+{
+
+ using Geom::X;
+ using Geom::Y;
+ this->p[2] = this->p[3] + (1./3)*(this->p[0] - this->p[3]);
+ this->p[2] = Geom::Point(this->p[2][X] + HANDLE_CUBIC_GAP,this->p[2][Y] + HANDLE_CUBIC_GAP);
+ std::unique_ptr<SPCurve> tmp_curve(new SPCurve());
+ std::unique_ptr<SPCurve> last_segment(new SPCurve());
+ Geom::Point point_c(0,0);
+ if( this->green_anchor && this->green_anchor->active ){
+ tmp_curve = this->green_curve->create_reverse();
+ if(this->green_curve->get_segment_count()==0){
+ return;
+ }
+ } else if(this->sa){
+ tmp_curve = this->sa_overwrited->create_reverse();
+ }else{
+ return;
+ }
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*tmp_curve ->last_segment());
+ if(this->bspline){
+ point_c = *tmp_curve ->last_point() + (1./3)*(tmp_curve ->last_segment()->initialPoint() - *tmp_curve ->last_point());
+ point_c = Geom::Point(point_c[X] + HANDLE_CUBIC_GAP, point_c[Y] + HANDLE_CUBIC_GAP);
+ }else{
+ point_c = this->p[3] + this->p[3] - this->p[2];
+ }
+ if(cubic){
+ last_segment->moveto((*cubic)[0]);
+ last_segment->curveto((*cubic)[1],point_c,(*cubic)[3]);
+ }else{
+ last_segment->moveto(tmp_curve ->last_segment()->initialPoint());
+ last_segment->lineto(*tmp_curve ->last_point());
+ }
+ if( tmp_curve ->get_segment_count() == 1){
+ tmp_curve = std::move(last_segment);
+ }else{
+ //we eliminate the last segment
+ tmp_curve ->backspace();
+ //and we add it again with the recreation
+ tmp_curve ->append_continuous(*last_segment);
+ }
+ tmp_curve = tmp_curve->create_reverse();
+ if( this->green_anchor && this->green_anchor->active )
+ {
+ this->green_curve->reset();
+ this->green_curve = std::move(tmp_curve);
+ }else{
+ this->sa_overwrited->reset();
+ this->sa_overwrited = std::move(tmp_curve);
+ }
+}
+
+void PenTool::_bsplineSpiroEndAnchorOff()
+{
+
+ std::unique_ptr<SPCurve> tmp_curve(new SPCurve());
+ std::unique_ptr<SPCurve> last_segment(new SPCurve());
+ this->p[2] = this->p[3];
+ if( this->green_anchor && this->green_anchor->active ){
+ tmp_curve = this->green_curve->create_reverse();
+ if(this->green_curve->get_segment_count()==0){
+ return;
+ }
+ } else if(this->sa){
+ tmp_curve = this->sa_overwrited->create_reverse();
+ }else{
+ return;
+ }
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*tmp_curve ->last_segment());
+ if(cubic){
+ last_segment->moveto((*cubic)[0]);
+ last_segment->curveto((*cubic)[1],(*cubic)[3],(*cubic)[3]);
+ }else{
+ last_segment->moveto(tmp_curve ->last_segment()->initialPoint());
+ last_segment->lineto(*tmp_curve ->last_point());
+ }
+ if( tmp_curve ->get_segment_count() == 1){
+ tmp_curve = std::move(last_segment);
+ }else{
+ //we eliminate the last segment
+ tmp_curve ->backspace();
+ //and we add it again with the recreation
+ tmp_curve ->append_continuous(*last_segment);
+ }
+ tmp_curve = tmp_curve->create_reverse();
+
+ if( this->green_anchor && this->green_anchor->active )
+ {
+ this->green_curve->reset();
+ this->green_curve = std::move(tmp_curve);
+ }else{
+ this->sa_overwrited->reset();
+ this->sa_overwrited = std::move(tmp_curve);
+ }
+}
+
+//prepares the curves for its transformation into BSpline curve.
+void PenTool::_bsplineSpiroBuild()
+{
+ if(!this->spiro && !this->bspline){
+ return;
+ }
+
+ //We create the base curve
+ auto curve = std::make_unique<SPCurve>();
+ //If we continuate the existing curve we add it at the start
+ if(this->sa && !this->sa->curve->is_unset()){
+ curve = this->sa_overwrited->copy();
+ }
+
+ if (!this->green_curve->is_unset()){
+ curve->append_continuous(*green_curve);
+ }
+
+ //and the red one
+ if (!this->red_curve->is_unset()){
+ this->red_curve->reset();
+ this->red_curve->moveto(this->p[0]);
+ if(this->anchor_statusbar && !this->sa && !(this->green_anchor && this->green_anchor->active)){
+ this->red_curve->curveto(this->p[1],this->p[3],this->p[3]);
+ }else{
+ this->red_curve->curveto(this->p[1],this->p[2],this->p[3]);
+ }
+ red_bpath->set_bpath(red_curve.get(), true);
+ curve->append_continuous(*red_curve);
+ }
+ previous = *this->red_curve->last_point();
+ if(!curve->is_unset()){
+ // close the curve if the final points of the curve are close enough
+ if(Geom::are_near(curve->first_path()->initialPoint(), curve->last_path()->finalPoint())){
+ curve->closepath_current();
+ }
+ //TODO: CALL TO CLONED FUNCTION SPIRO::doEffect IN lpe-spiro.cpp
+ //For example
+ //using namespace Inkscape::LivePathEffect;
+ //LivePathEffectObject *lpeobj = static_cast<LivePathEffectObject*> (curve);
+ //Effect *spr = static_cast<Effect*> ( new LPEbspline(lpeobj) );
+ //spr->doEffect(curve);
+ if (this->bspline) {
+ Geom::PathVector hp;
+ LivePathEffect::sp_bspline_do_effect(curve.get(), 0, hp);
+ } else {
+ LivePathEffect::sp_spiro_do_effect(curve.get());
+ }
+
+ blue_bpath->set_bpath(curve.get(), true);
+ blue_bpath->set_stroke(blue_color);
+ blue_bpath->show();
+
+ this->blue_curve->reset();
+ //We hide the holders that doesn't contribute anything
+ if (this->spiro){
+ c1->set_position(p[0]);
+ c1->show();
+ } else {
+ c1->hide();
+ }
+ c0->hide();
+ cl0->hide();
+ cl1->hide();
+ } else {
+ //if the curve is empty
+ blue_bpath->hide();
+ }
+}
+
+void PenTool::_setSubsequentPoint(Geom::Point const p, bool statusbar, guint status) {
+ g_assert( this->npoints != 0 );
+
+ // todo: Check callers to see whether 2 <= npoints is guaranteed.
+
+ this->p[2] = p;
+ this->p[3] = p;
+ this->p[4] = p;
+ this->npoints = 5;
+ this->red_curve->reset();
+ bool is_curve;
+ this->red_curve->moveto(this->p[0]);
+ if (this->polylines_paraxial && !statusbar) {
+ // we are drawing horizontal/vertical lines and hit an anchor;
+ Geom::Point const origin = this->p[0];
+ // if the previous point and the anchor are not aligned either horizontally or vertically...
+ if ((std::abs(p[Geom::X] - origin[Geom::X]) > 1e-9) && (std::abs(p[Geom::Y] - origin[Geom::Y]) > 1e-9)) {
+ // ...then we should draw an L-shaped path, consisting of two paraxial segments
+ Geom::Point intermed = p;
+ this->_setToNearestHorizVert(intermed, status);
+ this->red_curve->lineto(intermed);
+ }
+ this->red_curve->lineto(p);
+ is_curve = false;
+ } else {
+ // one of the 'regular' modes
+ if (this->p[1] != this->p[0] || this->spiro) {
+ this->red_curve->curveto(this->p[1], p, p);
+ is_curve = true;
+ } else {
+ this->red_curve->lineto(p);
+ is_curve = false;
+ }
+ }
+
+ red_bpath->set_bpath(red_curve.get(), true);
+
+ if (statusbar) {
+ gchar *message;
+ if(this->spiro || this->bspline){
+ message = is_curve ?
+ _("<b>Curve segment</b>: angle %3.2f&#176;; <b>Shift+Click</b> creates cusp node, <b>ALT</b> moves previous, <b>Enter</b> or <b>Shift+Enter</b> to finish" ):
+ _("<b>Line segment</b>: angle %3.2f&#176;; <b>Shift+Click</b> creates cusp node, <b>ALT</b> moves previous, <b>Enter</b> or <b>Shift+Enter</b> to finish");
+ this->_setAngleDistanceStatusMessage(p, 0, message);
+ } else {
+ message = is_curve ?
+ _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> or <b>Shift+Enter</b> to finish the path" ):
+ _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> or <b>Shift+Enter</b> to finish the path");
+ this->_setAngleDistanceStatusMessage(p, 0, message);
+ }
+
+ }
+}
+
+
+void PenTool::_setCtrl(Geom::Point const q, guint const state) { // use 'q' as 'p' shadows member variable.
+ c1->show();
+ cl1->show();
+
+ if ( this->npoints == 2 ) {
+ this->p[1] = q;
+ c0->hide();
+ cl0->hide();
+ c1->set_position(p[1]);
+ cl1->set_coords(p[0], p[1]);
+ this->_setAngleDistanceStatusMessage(q, 0, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"));
+ } else if ( this->npoints == 5 ) {
+ this->p[4] = q;
+ c0->show();
+ cl0->show();
+ bool is_symm = false;
+ if ( ( ( this->mode == PenTool::MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
+ ( ( this->mode == PenTool::MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
+ Geom::Point delta = q - this->p[3];
+ this->p[2] = this->p[3] - delta;
+ is_symm = true;
+ this->red_curve->reset();
+ this->red_curve->moveto(this->p[0]);
+ this->red_curve->curveto(this->p[1], this->p[2], this->p[3]);
+ red_bpath->set_bpath(red_curve.get(), true);
+ }
+ c0->set_position(this->p[2]);
+ cl0->set_coords(this->p[3], this->p[2]);
+ c1->set_position(this->p[4]);
+ cl1->set_coords(this->p[3], this->p[4]);
+
+
+
+ gchar *message = is_symm ?
+ _("<b>Curve handle, symmetric</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only") :
+ _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only");
+ this->_setAngleDistanceStatusMessage(q, 3, message);
+ } else {
+ g_warning("Something bad happened - npoints is %d", this->npoints);
+ }
+}
+
+void PenTool::_finishSegment(Geom::Point const q, guint const state) { // use 'q' as 'p' shadows member variable.
+ if (this->polylines_paraxial) {
+ this->nextParaxialDirection(q, this->p[0], state);
+ }
+
+ ++num_clicks;
+
+
+ if (!this->red_curve->is_unset()) {
+ this->_bsplineSpiro(state & GDK_SHIFT_MASK);
+ if(!this->green_curve->is_unset() &&
+ !Geom::are_near(*this->green_curve->last_point(),this->p[0]))
+ {
+ std::unique_ptr<SPCurve> lsegment(new SPCurve());
+ Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*this->green_curve->last_segment());
+ if (cubic) {
+ lsegment->moveto((*cubic)[0]);
+ lsegment->curveto((*cubic)[1], this->p[0] - ((*cubic)[2] - (*cubic)[3]), *this->red_curve->first_point());
+ this->green_curve->backspace();
+ green_curve->append_continuous(*lsegment);
+ }
+ }
+ this->green_curve->append_continuous(*red_curve);
+ auto curve = this->red_curve->copy();
+
+ /// \todo fixme:
+ auto canvas_shape = new Inkscape::CanvasItemBpath(_desktop->getCanvasSketch(), curve.get(), true);
+ canvas_shape->set_stroke(green_color);
+ canvas_shape->set_fill(0x0, SP_WIND_RULE_NONZERO);
+ this->green_bpaths.push_back(canvas_shape);
+
+ this->p[0] = this->p[3];
+ this->p[1] = this->p[4];
+ this->npoints = 2;
+
+ this->red_curve->reset();
+ }
+}
+
+// Partial fix for https://bugs.launchpad.net/inkscape/+bug/171990
+// TODO: implement the redo feature
+bool PenTool::_undoLastPoint() {
+ bool ret = false;
+
+ if ( this->green_curve->is_unset() || (this->green_curve->last_segment() == nullptr) ) {
+ if (!this->red_curve->is_unset()) {
+ this->_cancel ();
+ ret = true;
+ } else {
+ // do nothing; this event should be handled upstream
+ }
+ } else {
+ // Reset red curve
+ this->red_curve->reset();
+ // Get last segment
+ if ( this->green_curve->is_unset() ) {
+ g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
+ return false;
+ }
+ // The code below assumes that this->green_curve has only ONE path !
+ Geom::Curve const * crv = this->green_curve->last_segment();
+ this->p[0] = crv->initialPoint();
+ if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
+ this->p[1] = (*cubic)[1];
+
+ } else {
+ this->p[1] = this->p[0];
+ }
+
+ // assign the value in a third of the distance of the last segment.
+ if (this->bspline){
+ this->p[1] = this->p[0] + (1./3)*(this->p[3] - this->p[0]);
+ }
+
+ Geom::Point const pt( (this->npoints < 4) ? crv->finalPoint() : this->p[3] );
+
+ this->npoints = 2;
+ // delete the last segment of the green curve and green bpath
+ if (this->green_curve->get_segment_count() == 1) {
+ this->npoints = 5;
+ if (!this->green_bpaths.empty()) {
+ delete this->green_bpaths.back();
+ this->green_bpaths.pop_back();
+ }
+ this->green_curve->reset();
+ } else {
+ this->green_curve->backspace();
+ if (this->green_bpaths.size() > 1) {
+ delete this->green_bpaths.back();
+ this->green_bpaths.pop_back();
+ } else if (this->green_bpaths.size() == 1) {
+ green_bpaths.back()->set_bpath(green_curve.get(), true);
+ }
+ }
+
+ // assign the value of this->p[1] to the opposite of the green line last segment
+ if (this->spiro){
+ Geom::CubicBezier const *cubic = dynamic_cast<Geom::CubicBezier const *>(this->green_curve->last_segment());
+ if ( cubic ) {
+ this->p[1] = (*cubic)[3] + (*cubic)[3] - (*cubic)[2];
+ c1->set_position(this->p[0]);
+ } else {
+ this->p[1] = this->p[0];
+ }
+ }
+
+ c0->hide();
+ c1->hide();
+ cl0->hide();
+ cl1->hide();
+ this->state = PenTool::POINT;
+
+ if(this->polylines_paraxial) {
+ // We compare the point we're removing with the nearest horiz/vert to
+ // see if the line was added with SHIFT or not.
+ Geom::Point compare(pt);
+ this->_setToNearestHorizVert(compare, 0);
+ if ((std::abs(compare[Geom::X] - pt[Geom::X]) > 1e-9)
+ || (std::abs(compare[Geom::Y] - pt[Geom::Y]) > 1e-9)) {
+ this->paraxial_angle = this->paraxial_angle.cw();
+ }
+ }
+ this->_setSubsequentPoint(pt, true);
+
+ //redraw
+ this->_bsplineSpiroBuild();
+ ret = true;
+ }
+
+ return ret;
+}
+
+void PenTool::_finish(gboolean const closed) {
+ if (this->expecting_clicks_for_LPE > 1) {
+ // don't let the path be finished before we have collected the required number of mouse clicks
+ return;
+ }
+
+
+ this->num_clicks = 0;
+
+ this->_disableEvents();
+
+ this->message_context->clear();
+
+ _desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
+
+ // cancelate line without a created segment
+ this->red_curve->reset();
+ spdc_concat_colors_and_flush(this, closed);
+ this->sa = nullptr;
+ this->ea = nullptr;
+
+ this->npoints = 0;
+ this->state = PenTool::POINT;
+
+ c0->hide();
+ c1->hide();
+ cl0->hide();
+ cl1->hide();
+
+ this->green_anchor.reset();
+
+ this->_enableEvents();
+}
+
+void PenTool::_disableEvents() {
+ this->events_disabled = true;
+}
+
+void PenTool::_enableEvents() {
+ g_return_if_fail(this->events_disabled != 0);
+
+ this->events_disabled = false;
+}
+
+void PenTool::waitForLPEMouseClicks(Inkscape::LivePathEffect::EffectType effect_type, unsigned int num_clicks, bool use_polylines) {
+ if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
+ return;
+
+ this->waiting_LPE_type = effect_type;
+ this->expecting_clicks_for_LPE = num_clicks;
+ this->polylines_only = use_polylines;
+ this->polylines_paraxial = false; // TODO: think if this is correct for all cases
+}
+
+void PenTool::nextParaxialDirection(Geom::Point const &pt, Geom::Point const &origin, guint state) {
+ //
+ // after the first mouse click we determine whether the mouse pointer is closest to a
+ // horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
+ // orthogonal to the last one; pressing Shift toggles the direction
+ //
+ // num_clicks is not reliable because spdc_pen_finish_segment is sometimes called too early
+ // (on first mouse release), in which case num_clicks immediately becomes 1.
+ // if (this->num_clicks == 0) {
+
+ if (this->green_curve->is_unset()) {
+ // first mouse click
+ double h = pt[Geom::X] - origin[Geom::X];
+ double v = pt[Geom::Y] - origin[Geom::Y];
+ this->paraxial_angle = Geom::Point(h, v).ccw();
+ }
+ if(!(state & GDK_SHIFT_MASK)) {
+ this->paraxial_angle = this->paraxial_angle.ccw();
+ }
+}
+
+void PenTool::_setToNearestHorizVert(Geom::Point &pt, guint const state) const {
+ Geom::Point const origin = this->p[0];
+ Geom::Point const target = (state & GDK_SHIFT_MASK) ? this->paraxial_angle : this->paraxial_angle.ccw();
+
+ // Create a horizontal or vertical constraint line
+ Inkscape::Snapper::SnapConstraint cl(origin, target);
+
+ // Snap along the constraint line; if we didn't snap then still the constraint will be applied
+ SnapManager &m = _desktop->namedview->snap_manager;
+
+ Inkscape::Selection *selection = _desktop->getSelection();
+ // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
+ // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
+
+ m.setup(_desktop, true, selection->singleItem());
+ m.constrainedSnapReturnByRef(pt, Inkscape::SNAPSOURCE_NODE_HANDLE, cl);
+ m.unSetup();
+}
+
+}
+}
+}
+
+/*
+ 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 :