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diff --git a/src/ui/tools/arc-tool.cpp b/src/ui/tools/arc-tool.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Ellipse drawing context.
+ */
+/* Authors:
+ * Mitsuru Oka
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Johan Engelen <johan@shouraizou.nl>
+ * Abhishek Sharma
+ * Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2000-2006 Authors
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#include <glibmm/i18n.h>
+#include <gdk/gdkkeysyms.h>
+
+#include "context-fns.h"
+#include "desktop-style.h"
+#include "desktop.h"
+#include "document-undo.h"
+#include "document.h"
+#include "message-context.h"
+#include "preferences.h"
+#include "selection.h"
+#include "snap.h"
+
+#include "include/macros.h"
+
+#include "object/sp-ellipse.h"
+#include "object/sp-namedview.h"
+
+#include "ui/icon-names.h"
+#include "ui/modifiers.h"
+#include "ui/tools/arc-tool.h"
+#include "ui/shape-editor.h"
+#include "ui/tools/tool-base.h"
+
+#include "xml/repr.h"
+#include "xml/node-event-vector.h"
+
+using Inkscape::DocumentUndo;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+ArcTool::ArcTool(SPDesktop *desktop)
+ : ToolBase(desktop, "/tools/shapes/arc", "arc.svg")
+ , arc(nullptr)
+{
+ Inkscape::Selection *selection = desktop->getSelection();
+
+ this->shape_editor = new ShapeEditor(desktop);
+
+ SPItem *item = desktop->getSelection()->singleItem();
+ if (item) {
+ this->shape_editor->set_item(item);
+ }
+
+ this->sel_changed_connection.disconnect();
+ this->sel_changed_connection = selection->connectChanged(
+ sigc::mem_fun(this, &ArcTool::selection_changed)
+ );
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (prefs->getBool("/tools/shapes/selcue")) {
+ this->enableSelectionCue();
+ }
+
+ if (prefs->getBool("/tools/shapes/gradientdrag")) {
+ this->enableGrDrag();
+ }
+}
+
+ArcTool::~ArcTool()
+{
+ ungrabCanvasEvents();
+ this->finishItem();
+ this->sel_changed_connection.disconnect();
+
+ this->enableGrDrag(false);
+
+ this->sel_changed_connection.disconnect();
+
+ delete this->shape_editor;
+ this->shape_editor = nullptr;
+
+ /* fixme: This is necessary because we do not grab */
+ if (this->arc) {
+ this->finishItem();
+ }
+}
+
+/**
+ * Callback that processes the "changed" signal on the selection;
+ * destroys old and creates new knotholder.
+ */
+void ArcTool::selection_changed(Inkscape::Selection* selection) {
+ this->shape_editor->unset_item();
+ this->shape_editor->set_item(selection->singleItem());
+}
+
+
+bool ArcTool::item_handler(SPItem* item, GdkEvent* event) {
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ if (event->button.button == 1) {
+ this->setup_for_drag_start(event);
+ }
+ break;
+ // motion and release are always on root (why?)
+ default:
+ break;
+ }
+
+ return ToolBase::item_handler(item, event);
+}
+
+bool ArcTool::root_handler(GdkEvent* event) {
+ static bool dragging;
+
+ Inkscape::Selection *selection = _desktop->getSelection();
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+ this->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+
+ bool handled = false;
+
+ switch (event->type) {
+ case GDK_BUTTON_PRESS:
+ if (event->button.button == 1) {
+ dragging = true;
+
+ this->center = this->setup_for_drag_start(event);
+
+ /* Snap center */
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+ m.freeSnapReturnByRef(this->center, Inkscape::SNAPSOURCE_NODE_HANDLE);
+
+ grabCanvasEvents();
+
+ handled = true;
+ m.unSetup();
+ }
+ break;
+ case GDK_MOTION_NOTIFY:
+ if (dragging && (event->motion.state & GDK_BUTTON1_MASK)) {
+ if ( this->within_tolerance
+ && ( abs( (gint) event->motion.x - this->xp ) < this->tolerance )
+ && ( abs( (gint) event->motion.y - this->yp ) < this->tolerance ) ) {
+ break; // 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 draw, not click), then always process the
+ // motion notify coordinates as given (no snapping back to origin)
+ this->within_tolerance = false;
+
+ Geom::Point const motion_w(event->motion.x, event->motion.y);
+ Geom::Point motion_dt(_desktop->w2d(motion_w));
+
+ this->drag(motion_dt, event->motion.state);
+
+ gobble_motion_events(GDK_BUTTON1_MASK);
+
+ handled = true;
+ } else if (!this->sp_event_context_knot_mouseover()){
+ SnapManager &m = _desktop->namedview->snap_manager;
+ m.setup(_desktop);
+
+ Geom::Point const motion_w(event->motion.x, event->motion.y);
+ Geom::Point motion_dt(_desktop->w2d(motion_w));
+ m.preSnap(Inkscape::SnapCandidatePoint(motion_dt, Inkscape::SNAPSOURCE_NODE_HANDLE));
+ m.unSetup();
+ }
+ break;
+ case GDK_BUTTON_RELEASE:
+ this->xp = this->yp = 0;
+ if (event->button.button == 1) {
+ dragging = false;
+ this->discard_delayed_snap_event();
+
+ if (!this->within_tolerance) {
+ // we've been dragging, finish the arc
+ this->finishItem();
+ } else if (this->item_to_select) {
+ // no dragging, select clicked item if any
+ if (event->button.state & GDK_SHIFT_MASK) {
+ selection->toggle(this->item_to_select);
+ } else {
+ selection->set(this->item_to_select);
+ }
+ } else {
+ // click in an empty space
+ selection->clear();
+ }
+
+ this->xp = 0;
+ this->yp = 0;
+ this->item_to_select = nullptr;
+ handled = true;
+ }
+ ungrabCanvasEvents();
+ break;
+
+ case GDK_KEY_PRESS:
+ switch (get_latin_keyval (&event->key)) {
+ case GDK_KEY_Alt_L:
+ case GDK_KEY_Alt_R:
+ case GDK_KEY_Control_L:
+ case GDK_KEY_Control_R:
+ case GDK_KEY_Shift_L:
+ case GDK_KEY_Shift_R:
+ case GDK_KEY_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
+ case GDK_KEY_Meta_R:
+ if (!dragging) {
+ sp_event_show_modifier_tip(this->defaultMessageContext(), event,
+ _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
+ _("<b>Shift</b>: draw around the starting point"),
+ nullptr);
+ }
+ break;
+
+ case GDK_KEY_x:
+ case GDK_KEY_X:
+ if (MOD__ALT_ONLY(event)) {
+ _desktop->setToolboxFocusTo("arc-rx");
+ handled = true;
+ }
+ break;
+
+ case GDK_KEY_Escape:
+ if (dragging) {
+ dragging = false;
+ this->discard_delayed_snap_event();
+ // if drawing, cancel, otherwise pass it up for deselecting
+ this->cancel();
+ handled = true;
+ }
+ break;
+
+ case GDK_KEY_space:
+ if (dragging) {
+ ungrabCanvasEvents();
+ dragging = false;
+ this->discard_delayed_snap_event();
+
+ if (!this->within_tolerance) {
+ // we've been dragging, finish the arc
+ this->finishItem();
+ }
+ // do not return true, so that space would work switching to selector
+ }
+ break;
+
+ case GDK_KEY_Delete:
+ case GDK_KEY_KP_Delete:
+ case GDK_KEY_BackSpace:
+ handled = this->deleteSelectedDrag(MOD__CTRL_ONLY(event));
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case GDK_KEY_RELEASE:
+ switch (event->key.keyval) {
+ case GDK_KEY_Alt_L:
+ case GDK_KEY_Alt_R:
+ case GDK_KEY_Control_L:
+ case GDK_KEY_Control_R:
+ case GDK_KEY_Shift_L:
+ case GDK_KEY_Shift_R:
+ case GDK_KEY_Meta_L: // Meta is when you press Shift+Alt
+ case GDK_KEY_Meta_R:
+ this->defaultMessageContext()->clear();
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ if (!handled) {
+ handled = ToolBase::root_handler(event);
+ }
+
+ return handled;
+}
+
+void ArcTool::drag(Geom::Point pt, guint state) {
+ if (!this->arc) {
+ if (Inkscape::have_viable_layer(_desktop, defaultMessageContext()) == false) {
+ return;
+ }
+
+ // Create object
+ Inkscape::XML::Document *xml_doc = _desktop->doc()->getReprDoc();
+ Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
+ repr->setAttribute("sodipodi:type", "arc");
+
+ // Set style
+ sp_desktop_apply_style_tool(_desktop, repr, "/tools/shapes/arc", false);
+
+ auto layer = currentLayer();
+ this->arc = SP_GENERICELLIPSE(layer->appendChildRepr(repr));
+ Inkscape::GC::release(repr);
+ this->arc->transform = layer->i2doc_affine().inverse();
+ this->arc->updateRepr();
+ }
+
+ auto confine = Modifiers::Modifier::get(Modifiers::Type::TRANS_CONFINE)->active(state);
+ // Third is weirdly wrong, surely incrememnts should do something else.
+ auto circle_edge = Modifiers::Modifier::get(Modifiers::Type::TRANS_INCREMENT)->active(state);
+
+ Geom::Rect r = Inkscape::snap_rectangular_box(_desktop, this->arc, pt, this->center, state);
+
+ Geom::Point dir = r.dimensions() / 2;
+
+
+ if (circle_edge) {
+ /* With Alt let the ellipse pass through the mouse pointer */
+ Geom::Point c = r.midpoint();
+
+ if (!confine) {
+ if (fabs(dir[Geom::X]) > 1E-6 && fabs(dir[Geom::Y]) > 1E-6) {
+ Geom::Affine const i2d ( (this->arc)->i2dt_affine() );
+ Geom::Point new_dir = pt * i2d - c;
+ new_dir[Geom::X] *= dir[Geom::Y] / dir[Geom::X];
+ double lambda = new_dir.length() / dir[Geom::Y];
+ r = Geom::Rect (c - lambda*dir, c + lambda*dir);
+ }
+ } else {
+ /* with Alt+Ctrl (without Shift) we generate a perfect circle
+ with diameter click point <--> mouse pointer */
+ double l = dir.length();
+ Geom::Point d (l, l);
+ r = Geom::Rect (c - d, c + d);
+ }
+ }
+
+ this->arc->position_set(
+ r.midpoint()[Geom::X], r.midpoint()[Geom::Y],
+ r.dimensions()[Geom::X] / 2, r.dimensions()[Geom::Y] / 2);
+
+ double rdimx = r.dimensions()[Geom::X];
+ double rdimy = r.dimensions()[Geom::Y];
+
+ Inkscape::Util::Quantity rdimx_q = Inkscape::Util::Quantity(rdimx, "px");
+ Inkscape::Util::Quantity rdimy_q = Inkscape::Util::Quantity(rdimy, "px");
+ Glib::ustring xs = rdimx_q.string(_desktop->namedview->display_units);
+ Glib::ustring ys = rdimy_q.string(_desktop->namedview->display_units);
+
+ if (state & GDK_CONTROL_MASK) {
+ int ratio_x, ratio_y;
+ bool is_golden_ratio = false;
+
+ if (fabs (rdimx) > fabs (rdimy)) {
+ if (fabs(rdimx / rdimy - goldenratio) < 1e-6) {
+ is_golden_ratio = true;
+ }
+
+ ratio_x = (int) rint (rdimx / rdimy);
+ ratio_y = 1;
+ } else {
+ if (fabs(rdimy / rdimx - goldenratio) < 1e-6) {
+ is_golden_ratio = true;
+ }
+
+ ratio_x = 1;
+ ratio_y = (int) rint (rdimy / rdimx);
+ }
+
+ if (!is_golden_ratio) {
+ this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
+ _("<b>Ellipse</b>: %s &#215; %s (constrained to ratio %d:%d); with <b>Shift</b> to draw around the starting point"),
+ xs.c_str(), ys.c_str(), ratio_x, ratio_y);
+ } else {
+ if (ratio_y == 1) {
+ this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
+ _("<b>Ellipse</b>: %s &#215; %s (constrained to golden ratio 1.618 : 1); with <b>Shift</b> to draw around the starting point"),
+ xs.c_str(), ys.c_str());
+ } else {
+ this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
+ _("<b>Ellipse</b>: %s &#215; %s (constrained to golden ratio 1 : 1.618); with <b>Shift</b> to draw around the starting point"),
+ xs.c_str(), ys.c_str());
+ }
+ }
+ } else {
+ this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Ellipse</b>: %s &#215; %s; with <b>Ctrl</b> to make circle, integer-ratio, or golden-ratio ellipse; with <b>Shift</b> to draw around the starting point"), xs.c_str(), ys.c_str());
+ }
+}
+
+void ArcTool::finishItem() {
+ this->message_context->clear();
+
+ if (this->arc != nullptr) {
+ if (this->arc->rx.computed == 0 || this->arc->ry.computed == 0) {
+ this->cancel(); // Don't allow the creating of zero sized arc, for example when the start and and point snap to the snap grid point
+ return;
+ }
+
+ this->arc->updateRepr();
+ this->arc->doWriteTransform(this->arc->transform, nullptr, true);
+
+ _desktop->getSelection()->set(this->arc);
+
+ DocumentUndo::done(_desktop->getDocument(), _("Create ellipse"), INKSCAPE_ICON("draw-ellipse"));
+
+ this->arc = nullptr;
+ }
+}
+
+void ArcTool::cancel() {
+ _desktop->getSelection()->clear();
+ ungrabCanvasEvents();
+
+ if (this->arc != nullptr) {
+ this->arc->deleteObject();
+ this->arc = nullptr;
+ }
+
+ this->within_tolerance = false;
+ this->xp = 0;
+ this->yp = 0;
+ this->item_to_select = nullptr;
+
+ DocumentUndo::cancel(_desktop->getDocument());
+}
+
+}
+}
+}
+
+
+/*
+ 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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