Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 411 insertions, 0 deletions

diff --git a/src/ui/tools/spiral-tool.cpp b/src/ui/tools/spiral-tool.cpp
new file mode 100644
index 0000000..f79eab7
--- /dev/null
+++ b/src/ui/tools/spiral-tool.cpp
@@ -0,0 +1,411 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Spiral drawing context
+ *
+ * Authors:
+ *   Mitsuru Oka
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   bulia byak <buliabyak@users.sf.net>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 1999-2001 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 "spiral-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-spiral.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 {
+
+SpiralTool::SpiralTool(SPDesktop *desktop)
+    : ToolBase(desktop, "/tools/shapes/spiral", "spiral.svg")
+    , spiral(nullptr)
+    , revo(3)
+    , exp(1)
+    , t0(0)
+{
+    sp_event_context_read(this, "expansion");
+    sp_event_context_read(this, "revolution");
+    sp_event_context_read(this, "t0");
+
+    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, &SpiralTool::selection_changed));
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (prefs->getBool("/tools/shapes/selcue")) {
+        this->enableSelectionCue();
+    }
+
+    if (prefs->getBool("/tools/shapes/gradientdrag")) {
+        this->enableGrDrag();
+    }
+}
+
+SpiralTool::~SpiralTool() {
+    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->spiral) {
+    	this->finishItem();
+    }
+}
+
+/**
+ * Callback that processes the "changed" signal on the selection;
+ * destroys old and creates new knotholder.
+ */
+void SpiralTool::selection_changed(Inkscape::Selection *selection) {
+    this->shape_editor->unset_item();
+    this->shape_editor->set_item(selection->singleItem());
+}
+
+
+void SpiralTool::set(const Inkscape::Preferences::Entry& val) {
+    Glib::ustring name = val.getEntryName();
+
+    if (name == "expansion") {
+        this->exp = CLAMP(val.getDouble(), 0.0, 1000.0);
+    } else if (name == "revolution") {
+        this->revo = CLAMP(val.getDouble(3.0), 0.05, 40.0);
+    } else if (name == "t0") {
+        this->t0 = CLAMP(val.getDouble(), 0.0, 0.999);
+    }
+}
+
+bool SpiralTool::root_handler(GdkEvent* event) {
+    static gboolean 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);
+
+                SnapManager &m = _desktop->namedview->snap_manager;
+                m.setup(_desktop);
+                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));
+
+                SnapManager &m = _desktop->namedview->snap_manager;
+                m.setup(_desktop, true, this->spiral);
+                m.freeSnapReturnByRef(motion_dt, Inkscape::SNAPSOURCE_NODE_HANDLE);
+                m.unSetup();
+
+                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 spiral
+                    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"),
+                                               nullptr,
+                                               _("<b>Alt</b>: lock spiral radius"));
+                    break;
+
+                case GDK_KEY_x:
+                case GDK_KEY_X:
+                    if (MOD__ALT_ONLY(event)) {
+                        _desktop->setToolboxFocusTo("spiral-revolutions");
+                        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 spiral
+                            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 SpiralTool::drag(Geom::Point const &p, guint state) {
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
+
+    if (!this->spiral) {
+        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", "spiral");
+
+        // Set style
+        sp_desktop_apply_style_tool(_desktop, repr, "/tools/shapes/spiral", false);
+
+        this->spiral = SP_SPIRAL(currentLayer()->appendChildRepr(repr));
+        Inkscape::GC::release(repr);
+        this->spiral->transform = currentLayer()->i2doc_affine().inverse();
+        this->spiral->updateRepr();
+    }
+
+    SnapManager &m = _desktop->namedview->snap_manager;
+    m.setup(_desktop, true, this->spiral);
+    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);
+
+    Geom::Point const delta = p1 - p0;
+    gdouble const rad = Geom::L2(delta);
+
+    // Start angle calculated from end angle and number of revolutions.
+    gdouble arg = Geom::atan2(delta) - 2.0*M_PI * spiral->revo;
+
+    if (state & GDK_CONTROL_MASK) {
+        /* Snap start angle */
+        double snaps_radian = M_PI/snaps;
+        arg = std::round(arg/snaps_radian) * snaps_radian;
+    }
+
+    /* Fixme: these parameters should be got from dialog box */
+    this->spiral->setPosition(p0[Geom::X], p0[Geom::Y],
+                           /*expansion*/ this->exp,
+                           /*revolution*/ this->revo,
+                           rad, arg,
+                           /*t0*/ this->t0);
+
+    /* status text */
+    Inkscape::Util::Quantity q = Inkscape::Util::Quantity(rad, "px");
+    Glib::ustring rads = q.string(_desktop->namedview->display_units);
+    this->message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
+                               _("<b>Spiral</b>: radius %s, angle %.2f&#176;; with <b>Ctrl</b> to snap angle"),
+                                rads.c_str(), arg * 180/M_PI + 360*spiral->revo);
+}
+
+void SpiralTool::finishItem() {
+    this->message_context->clear();
+
+    if (this->spiral != nullptr) {
+    	if (this->spiral->rad == 0) {
+    		this->cancel(); // Don't allow the creating of zero sized spiral, for example when the start and and point snap to the snap grid point
+    		return;
+    	}
+
+        spiral->set_shape();
+        spiral->updateRepr(SP_OBJECT_WRITE_EXT);
+        // compensate stroke scaling couldn't be done in doWriteTransform
+        double const expansion = spiral->transform.descrim();
+        spiral->doWriteTransform(spiral->transform, nullptr, true);
+        spiral->adjust_stroke_width_recursive(expansion);
+
+        _desktop->getSelection()->set(this->spiral);
+        DocumentUndo::done(_desktop->getDocument(), _("Create spiral"), INKSCAPE_ICON("draw-spiral"));
+
+        this->spiral = nullptr;
+    }
+}
+
+void SpiralTool::cancel() {
+    _desktop->getSelection()->clear();
+    ungrabCanvasEvents();
+
+    if (this->spiral != nullptr) {
+    	this->spiral->deleteObject();
+    	this->spiral = 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 :