Adding upstream version 1.3+ds.upstream/1.3+dsupstream

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

1 files changed, 454 insertions, 0 deletions

diff --git a/src/ui/tools/arc-tool.cpp b/src/ui/tools/arc-tool.cpp
new file mode 100644
index 0000000..cd1c036
--- /dev/null
+++ b/src/ui/tools/arc-tool.cpp
@@ -0,0 +1,454 @@
+// 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"
+
+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 (arc) {
+                    // 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 if (!selection->includes(this->item_to_select)) {
+                        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 = cast<SPGenericEllipse>(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 :