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-rw-r--r--src/ui/tools/star-tool.cpp430
1 files changed, 430 insertions, 0 deletions
diff --git a/src/ui/tools/star-tool.cpp b/src/ui/tools/star-tool.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Star drawing context
+ *
+ * Authors:
+ * Mitsuru Oka <oka326@parkcity.ne.jp>
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Jon A. Cruz <jon@joncruz.org>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2001-2002 Mitsuru Oka
+ *
+ * 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 "star-tool.h"
+
+#include "context-fns.h"
+#include "desktop-style.h"
+#include "desktop.h"
+#include "document-undo.h"
+#include "document.h"
+#include "message-context.h"
+#include "selection.h"
+
+#include "include/macros.h"
+
+#include "object/sp-namedview.h"
+#include "object/sp-star.h"
+
+#include "ui/icon-names.h"
+#include "ui/shape-editor.h"
+
+#include "xml/node-event-vector.h"
+
+using Inkscape::DocumentUndo;
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+StarTool::StarTool(SPDesktop *desktop)
+ : ToolBase(desktop, "/tools/shapes/star", "star.svg")
+ , star(nullptr)
+ , magnitude(5)
+ , proportion(0.5)
+ , isflatsided(false)
+ , rounded(0)
+ , randomized(0)
+{
+ sp_event_context_read(this, "isflatsided");
+ sp_event_context_read(this, "magnitude");
+ sp_event_context_read(this, "proportion");
+ sp_event_context_read(this, "rounded");
+ sp_event_context_read(this, "randomized");
+
+ this->shape_editor = new ShapeEditor(desktop);
+
+ SPItem *item = desktop->getSelection()->singleItem();
+ if (item) {
+ this->shape_editor->set_item(item);
+ }
+
+ Inkscape::Selection *selection = desktop->getSelection();
+
+ this->sel_changed_connection.disconnect();
+
+ this->sel_changed_connection = selection->connectChanged(sigc::mem_fun(this, &StarTool::selection_changed));
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (prefs->getBool("/tools/shapes/selcue")) {
+ this->enableSelectionCue();
+ }
+
+ if (prefs->getBool("/tools/shapes/gradientdrag")) {
+ this->enableGrDrag();
+ }
+}
+
+StarTool::~StarTool() {
+ ungrabCanvasEvents();
+
+ this->finishItem();
+ this->sel_changed_connection.disconnect();
+
+ this->enableGrDrag(false);
+
+ delete this->shape_editor;
+ this->shape_editor = nullptr;
+
+ /* fixme: This is necessary because we do not grab */
+ if (this->star) {
+ this->finishItem();
+ }
+}
+
+/**
+ * Callback that processes the "changed" signal on the selection;
+ * destroys old and creates new knotholder.
+ *
+ * @param selection Should not be NULL.
+ */
+void StarTool::selection_changed(Inkscape::Selection* selection) {
+ g_assert (selection != nullptr);
+
+ this->shape_editor->unset_item();
+ this->shape_editor->set_item(selection->singleItem());
+}
+
+
+void StarTool::set(const Inkscape::Preferences::Entry& val) {
+ Glib::ustring path = val.getEntryName();
+
+ if (path == "magnitude") {
+ this->magnitude = CLAMP(val.getInt(5), this->isflatsided ? 3 : 2, 1024);
+ } else if (path == "proportion") {
+ this->proportion = CLAMP(val.getDouble(0.5), 0.01, 2.0);
+ } else if (path == "isflatsided") {
+ this->isflatsided = val.getBool();
+ } else if (path == "rounded") {
+ this->rounded = val.getDouble();
+ } else if (path == "randomized") {
+ this->randomized = val.getDouble();
+ }
+}
+
+bool StarTool::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);
+
+ gint ret = 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, true);
+ m.freeSnapReturnByRef(this->center, Inkscape::SNAPSOURCE_NODE_HANDLE);
+ m.unSetup();
+
+ grabCanvasEvents();
+ ret = TRUE;
+ }
+ 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);
+
+ ret = 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 star
+ 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->item_to_select = nullptr;
+ ret = TRUE;
+ ungrabCanvasEvents();
+ }
+ break;
+
+ case GDK_KEY_PRESS:
+ switch (get_latin_keyval(&event->key)) {
+ 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:
+ sp_event_show_modifier_tip(this->defaultMessageContext(), event,
+ _("<b>Ctrl</b>: snap angle; keep rays radial"),
+ nullptr,
+ nullptr);
+ break;
+
+ case GDK_KEY_x:
+ case GDK_KEY_X:
+ if (MOD__ALT_ONLY(event)) {
+ _desktop->setToolboxFocusTo("altx-star");
+ ret = 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();
+ ret = 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 star
+ 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:
+ ret = this->deleteSelectedDrag(MOD__CTRL_ONLY(event));
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case GDK_KEY_RELEASE:
+ 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
+ case GDK_KEY_Meta_R:
+ this->defaultMessageContext()->clear();
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ if (!ret) {
+ ret = ToolBase::root_handler(event);
+ }
+
+ return ret;
+}
+
+void StarTool::drag(Geom::Point p, guint state)
+{
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
+
+ if (!this->star) {
+ 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", "star");
+
+ // Set style
+ sp_desktop_apply_style_tool(_desktop, repr, "/tools/shapes/star", false);
+
+ this->star = SP_STAR(currentLayer()->appendChildRepr(repr));
+
+ Inkscape::GC::release(repr);
+ this->star->transform = currentLayer()->i2doc_affine().inverse();
+ this->star->updateRepr();
+ }
+
+ /* Snap corner point with no constraints */
+ SnapManager &m = _desktop->namedview->snap_manager;
+
+ m.setup(_desktop, true, this->star);
+ Geom::Point pt2g = p;
+ m.freeSnapReturnByRef(pt2g, Inkscape::SNAPSOURCE_NODE_HANDLE);
+ m.unSetup();
+
+ Geom::Point const p0 = _desktop->dt2doc(this->center);
+ Geom::Point const p1 = _desktop->dt2doc(pt2g);
+
+ double const sides = (gdouble) this->magnitude;
+ Geom::Point const d = p1 - p0;
+ Geom::Coord const r1 = Geom::L2(d);
+ double arg1 = atan2(d);
+
+ if (state & GDK_CONTROL_MASK) {
+ /* Snap angle */
+ double snaps_radian = M_PI/snaps;
+ arg1 = std::round(arg1/snaps_radian) * snaps_radian;
+ }
+
+ sp_star_position_set(this->star, this->magnitude, p0, r1, r1 * this->proportion,
+ arg1, arg1 + M_PI / sides, this->isflatsided, this->rounded, this->randomized);
+
+ /* status text */
+ Inkscape::Util::Quantity q = Inkscape::Util::Quantity(r1, "px");
+ Glib::ustring rads = q.string(_desktop->namedview->display_units);
+ this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
+ ( this->isflatsided?
+ _("<b>Polygon</b>: radius %s, angle %.2f&#176;; with <b>Ctrl</b> to snap angle") :
+ _("<b>Star</b>: radius %s, angle %.2f&#176;; with <b>Ctrl</b> to snap angle") ),
+ rads.c_str(), arg1 * 180 / M_PI);
+}
+
+void StarTool::finishItem() {
+ this->message_context->clear();
+
+ if (this->star != nullptr) {
+ if (this->star->r[1] == 0) {
+ // Don't allow the creating of zero sized arc, for example
+ // when the start and and point snap to the snap grid point
+ this->cancel();
+ return;
+ }
+
+ // Set transform center, so that odd stars rotate correctly
+ // LP #462157
+ this->star->setCenter(this->center);
+ this->star->set_shape();
+ this->star->updateRepr(SP_OBJECT_WRITE_EXT);
+ // compensate stroke scaling couldn't be done in doWriteTransform
+ double const expansion = this->star->transform.descrim();
+ this->star->doWriteTransform(this->star->transform, nullptr, true);
+ this->star->adjust_stroke_width_recursive(expansion);
+
+ _desktop->getSelection()->set(this->star);
+ DocumentUndo::done(_desktop->getDocument(), _("Create star"), INKSCAPE_ICON("draw-polygon-star"));
+
+ this->star = nullptr;
+ }
+}
+
+void StarTool::cancel() {
+ _desktop->getSelection()->clear();
+ ungrabCanvasEvents();
+
+ if (this->star != nullptr) {
+ this->star->deleteObject();
+ this->star = 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 :