1 files changed, 494 insertions, 0 deletions

diff --git a/src/ui/tools/lpe-tool.cpp b/src/ui/tools/lpe-tool.cpp
new file mode 100644
index 0000000..d1e7e18
--- /dev/null
+++ b/src/ui/tools/lpe-tool.cpp
@@ -0,0 +1,494 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * LPEToolContext: a context for a generic tool composed of subtools that are given by LPEs
+ *
+ * Authors:
+ *   Maximilian Albert <maximilian.albert@gmail.com>
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *   Abhishek Sharma
+ *
+ * Copyright (C) 1998 The Free Software Foundation
+ * Copyright (C) 1999-2005 authors
+ * Copyright (C) 2001-2002 Ximian, Inc.
+ * Copyright (C) 2008 Maximilian Albert
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glibmm/i18n.h>
+#include <gtk/gtk.h>
+
+#include <2geom/sbasis-geometric.h>
+
+#include "desktop.h"
+#include "document.h"
+#include "message-context.h"
+#include "message-stack.h"
+#include "selection.h"
+
+#include "display/curve.h"
+#include "display/canvas-bpath.h"
+#include "display/canvas-text.h"
+
+#include "object/sp-path.h"
+
+#include "ui/pixmaps/cursor-crosshairs.xpm"
+
+#include "util/units.h"
+
+#include "ui/toolbar/lpe-toolbar.h"
+#include "ui/tools/lpe-tool.h"
+#include "ui/shape-editor.h"
+
+using Inkscape::Util::unit_table;
+using Inkscape::UI::Tools::PenTool;
+
+const int num_subtools = 8;
+
+SubtoolEntry lpesubtools[] = {
+    // this must be here to account for the "all inactive" action
+    {Inkscape::LivePathEffect::INVALID_LPE, "draw-geometry-inactive"},
+    {Inkscape::LivePathEffect::LINE_SEGMENT, "draw-geometry-line-segment"},
+    {Inkscape::LivePathEffect::CIRCLE_3PTS, "draw-geometry-circle-from-three-points"},
+    {Inkscape::LivePathEffect::CIRCLE_WITH_RADIUS, "draw-geometry-circle-from-radius"},
+    {Inkscape::LivePathEffect::PARALLEL, "draw-geometry-line-parallel"},
+    {Inkscape::LivePathEffect::PERP_BISECTOR, "draw-geometry-line-perpendicular"},
+    {Inkscape::LivePathEffect::ANGLE_BISECTOR, "draw-geometry-angle-bisector"},
+    {Inkscape::LivePathEffect::MIRROR_SYMMETRY, "draw-geometry-mirror"}
+};
+
+namespace Inkscape {
+namespace UI {
+namespace Tools {
+
+void sp_lpetool_context_selection_changed(Inkscape::Selection *selection, gpointer data);
+
+const std::string& LpeTool::getPrefsPath() {
+	return LpeTool::prefsPath;
+}
+
+const std::string LpeTool::prefsPath = "/tools/lpetool";
+
+LpeTool::LpeTool()
+    : PenTool(cursor_crosshairs_xpm)
+    , shape_editor(nullptr)
+    , canvas_bbox(nullptr)
+    , mode(Inkscape::LivePathEffect::BEND_PATH)
+// TODO: pointer?
+    , measuring_items(new std::map<SPPath *, SPCanvasItem*>)
+{
+}
+
+LpeTool::~LpeTool() {
+    delete this->shape_editor;
+    this->shape_editor = nullptr;
+
+    if (this->canvas_bbox) {
+        sp_canvas_item_destroy(SP_CANVAS_ITEM(this->canvas_bbox));
+        this->canvas_bbox = nullptr;
+    }
+
+    lpetool_delete_measuring_items(this);
+    delete this->measuring_items;
+    this->measuring_items = nullptr;
+
+    this->sel_changed_connection.disconnect();
+}
+
+void LpeTool::setup() {
+    PenTool::setup();
+
+    Inkscape::Selection *selection = this->desktop->getSelection();
+    SPItem *item = selection->singleItem();
+
+    this->sel_changed_connection.disconnect();
+    this->sel_changed_connection =
+        selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_lpetool_context_selection_changed), (gpointer)this));
+
+    this->shape_editor = new ShapeEditor(this->desktop);
+
+    lpetool_context_switch_mode(this, Inkscape::LivePathEffect::INVALID_LPE);
+    lpetool_context_reset_limiting_bbox(this);
+    lpetool_create_measuring_items(this);
+
+// TODO temp force:
+    this->enableSelectionCue();
+    
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    if (item) {
+        this->shape_editor->set_item(item);
+    }
+
+    if (prefs->getBool("/tools/lpetool/selcue")) {
+        this->enableSelectionCue();
+    }
+}
+
+/**
+ * Callback that processes the "changed" signal on the selection;
+ * destroys old and creates new nodepath and reassigns listeners to the new selected item's repr.
+ */
+void sp_lpetool_context_selection_changed(Inkscape::Selection *selection, gpointer data)
+{
+    LpeTool *lc = SP_LPETOOL_CONTEXT(data);
+
+    lc->shape_editor->unset_item();
+    SPItem *item = selection->singleItem();
+    lc->shape_editor->set_item(item);
+}
+
+void LpeTool::set(const Inkscape::Preferences::Entry& val) {
+    if (val.getEntryName() == "mode") {
+        Inkscape::Preferences::get()->setString("/tools/geometric/mode", "drag");
+        SP_PEN_CONTEXT(this)->mode = PenTool::MODE_DRAG;
+    }
+}
+
+bool LpeTool::item_handler(SPItem* item, GdkEvent* event) {
+    gint ret = FALSE;
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+        {
+            // select the clicked item but do nothing else
+            Inkscape::Selection * const selection = this->desktop->getSelection();
+            selection->clear();
+            selection->add(item);
+            ret = TRUE;
+            break;
+        }
+        case GDK_BUTTON_RELEASE:
+            // TODO: do we need to catch this or can we pass it on to the parent handler?
+            ret = TRUE;
+            break;
+        default:
+            break;
+    }
+
+    if (!ret) {
+    	ret = PenTool::item_handler(item, event);
+    }
+
+    return ret;
+}
+
+bool LpeTool::root_handler(GdkEvent* event) {
+    Inkscape::Selection *selection = desktop->getSelection();
+
+    bool ret = false;
+
+    if (this->hasWaitingLPE()) {
+        // quit when we are waiting for a LPE to be applied
+        //ret = ((ToolBaseClass *) sp_lpetool_context_parent_class)->root_handler(event_context, event);
+	return PenTool::root_handler(event);
+    }
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+            if (event->button.button == 1 && !this->space_panning) {
+                if (this->mode == Inkscape::LivePathEffect::INVALID_LPE) {
+                    // don't do anything for now if we are inactive (except clearing the selection
+                    // since this was a click into empty space)
+                    selection->clear();
+                    desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("Choose a construction tool from the toolbar."));
+                    ret = true;
+                    break;
+                }
+
+                // save drag origin
+                this->xp = (gint) event->button.x;
+                this->yp = (gint) event->button.y;
+                this->within_tolerance = true;
+
+                using namespace Inkscape::LivePathEffect;
+
+                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+                int mode = prefs->getInt("/tools/lpetool/mode");
+                EffectType type = lpesubtools[mode].type;
+
+                //bool over_stroke = lc->shape_editor->is_over_stroke(Geom::Point(event->button.x, event->button.y), true);
+
+                this->waitForLPEMouseClicks(type, Inkscape::LivePathEffect::Effect::acceptsNumClicks(type));
+
+                // we pass the mouse click on to pen tool as the first click which it should collect
+                //ret = ((ToolBaseClass *) sp_lpetool_context_parent_class)->root_handler(event_context, event);
+		ret = PenTool::root_handler(event);
+            }
+            break;
+
+
+    case GDK_BUTTON_RELEASE:
+    {
+        /**
+        break;
+        **/
+    }
+
+    case GDK_KEY_PRESS:
+        /**
+        switch (get_latin_keyval (&event->key)) {
+        }
+        break;
+        **/
+
+    case GDK_KEY_RELEASE:
+        /**
+        switch (get_latin_keyval(&event->key)) {
+            case GDK_Control_L:
+            case GDK_Control_R:
+                dc->_message_context->clear();
+                break;
+            default:
+                break;
+        }
+        **/
+
+    default:
+        break;
+    }
+
+    if (!ret) {
+    	ret = PenTool::root_handler(event);
+    }
+
+    return ret;
+}
+
+/*
+ * Finds the index in the list of geometric subtools corresponding to the given LPE type.
+ * Returns -1 if no subtool is found.
+ */
+int
+lpetool_mode_to_index(Inkscape::LivePathEffect::EffectType const type) {
+    for (int i = 0; i < num_subtools; ++i) {
+        if (lpesubtools[i].type == type) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+/*
+ * Checks whether an item has a construction applied as LPE and if so returns the index in
+ * lpesubtools of this construction
+ */
+int lpetool_item_has_construction(LpeTool */*lc*/, SPItem *item)
+{
+    if (!SP_IS_LPE_ITEM(item)) {
+        return -1;
+    }
+
+    Inkscape::LivePathEffect::Effect* lpe = SP_LPE_ITEM(item)->getCurrentLPE();
+    if (!lpe) {
+        return -1;
+    }
+    return lpetool_mode_to_index(lpe->effectType());
+}
+
+/*
+ * Attempts to perform the construction of the given type (i.e., to apply the corresponding LPE) to
+ * a single selected item. Returns whether we succeeded.
+ */
+bool
+lpetool_try_construction(LpeTool *lc, Inkscape::LivePathEffect::EffectType const type)
+{
+    Inkscape::Selection *selection = lc->desktop->getSelection();
+    SPItem *item = selection->singleItem();
+
+    // TODO: should we check whether type represents a valid geometric construction?
+    if (item && SP_IS_LPE_ITEM(item) && Inkscape::LivePathEffect::Effect::acceptsNumClicks(type) == 0) {
+        Inkscape::LivePathEffect::Effect::createAndApply(type, lc->desktop->getDocument(), item);
+        return true;
+    }
+    return false;
+}
+
+void
+lpetool_context_switch_mode(LpeTool *lc, Inkscape::LivePathEffect::EffectType const type)
+{
+    int index = lpetool_mode_to_index(type);
+    if (index != -1) {
+        lc->mode = type;
+        auto tb = dynamic_cast<UI::Toolbar::LPEToolbar*>(lc->desktop->get_toolbar_by_name("LPEToolToolbar"));
+
+        if(tb) {
+            tb->set_mode(index);
+        } else {
+            std::cerr << "Could not access LPE toolbar" << std::endl;
+        }
+    } else {
+        g_warning ("Invalid mode selected: %d", type);
+        return;
+    }
+}
+
+void
+lpetool_get_limiting_bbox_corners(SPDocument *document, Geom::Point &A, Geom::Point &B) {
+    Geom::Coord w = document->getWidth().value("px");
+    Geom::Coord h = document->getHeight().value("px");
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+
+    double ulx = prefs->getDouble("/tools/lpetool/bbox_upperleftx", 0);
+    double uly = prefs->getDouble("/tools/lpetool/bbox_upperlefty", 0);
+    double lrx = prefs->getDouble("/tools/lpetool/bbox_lowerrightx", w);
+    double lry = prefs->getDouble("/tools/lpetool/bbox_lowerrighty", h);
+
+    A = Geom::Point(ulx, uly);
+    B = Geom::Point(lrx, lry);
+}
+
+/*
+ * Reads the limiting bounding box from preferences and draws it on the screen
+ */
+// TODO: Note that currently the bbox is not user-settable; we simply use the page borders
+void
+lpetool_context_reset_limiting_bbox(LpeTool *lc)
+{
+    if (lc->canvas_bbox) {
+        sp_canvas_item_destroy(lc->canvas_bbox);
+        lc->canvas_bbox = nullptr;
+    }
+
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    if (!prefs->getBool("/tools/lpetool/show_bbox", true))
+        return;
+
+    SPDocument *document = lc->desktop->getDocument();
+
+    Geom::Point A, B;
+    lpetool_get_limiting_bbox_corners(document, A, B);
+    Geom::Affine doc2dt(lc->desktop->doc2dt());
+    A *= doc2dt;
+    B *= doc2dt;
+
+    Geom::Rect rect(A, B);
+    SPCurve *curve = SPCurve::new_from_rect(rect);
+
+    lc->canvas_bbox = sp_canvas_bpath_new (lc->desktop->getControls(), curve);
+    sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(lc->canvas_bbox), 0x0000ffff, 0.8, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT, 5, 5);
+}
+
+static void
+set_pos_and_anchor(SPCanvasText *canvas_text, const Geom::Piecewise<Geom::D2<Geom::SBasis> > &pwd2,
+                   const double t, const double length, bool /*use_curvature*/ = false)
+{
+    using namespace Geom;
+
+    Piecewise<D2<SBasis> > pwd2_reparam = arc_length_parametrization(pwd2, 2 , 0.1);
+    double t_reparam = pwd2_reparam.cuts.back() * t;
+    Point pos = pwd2_reparam.valueAt(t_reparam);
+    Point dir = unit_vector(derivative(pwd2_reparam).valueAt(t_reparam));
+    Point n = -rot90(dir);
+    double angle = Geom::angle_between(dir, Point(1,0));
+
+    sp_canvastext_set_coords(canvas_text, pos + n * length);
+    sp_canvastext_set_anchor_manually(canvas_text, std::sin(angle), -std::cos(angle));
+}
+
+void
+lpetool_create_measuring_items(LpeTool *lc, Inkscape::Selection *selection)
+{
+    if (!selection) {
+        selection = lc->desktop->getSelection();
+    }
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    bool show = prefs->getBool("/tools/lpetool/show_measuring_info",  true);
+
+    SPPath *path;
+    SPCurve *curve;
+    SPCanvasText *canvas_text;
+    SPCanvasGroup *tmpgrp = lc->desktop->getTempGroup();
+    gchar *arc_length;
+    double lengthval;
+    auto items= selection->items();
+    for(auto i=items.begin();i!=items.end();++i){
+        if (SP_IS_PATH(*i)) {
+            path = SP_PATH(*i);
+            curve = path->getCurve();
+            Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2 = paths_to_pw(curve->get_pathvector());
+            canvas_text = (SPCanvasText *) sp_canvastext_new(tmpgrp, lc->desktop, Geom::Point(0,0), "");
+            if (!show)
+                sp_canvas_item_hide(SP_CANVAS_ITEM(canvas_text));
+
+            Inkscape::Util::Unit const * unit = nullptr;
+            if (prefs->getString("/tools/lpetool/unit").compare("")) {
+                unit = unit_table.getUnit(prefs->getString("/tools/lpetool/unit"));
+            } else {
+                unit = unit_table.getUnit("px");
+            }
+
+            lengthval = Geom::length(pwd2);
+            lengthval = Inkscape::Util::Quantity::convert(lengthval, "px", unit);
+            arc_length = g_strdup_printf("%.2f %s", lengthval, unit->abbr.c_str());
+            sp_canvastext_set_text (canvas_text, arc_length);
+            set_pos_and_anchor(canvas_text, pwd2, 0.5, 10);
+            // TODO: must we free arc_length?
+            (*lc->measuring_items)[path] = SP_CANVAS_ITEM(canvas_text);
+        }
+    }
+}
+
+void
+lpetool_delete_measuring_items(LpeTool *lc)
+{
+    std::map<SPPath *, SPCanvasItem*>::iterator i;
+    for (i = lc->measuring_items->begin(); i != lc->measuring_items->end(); ++i) {
+        sp_canvas_item_destroy(i->second);
+    }
+    lc->measuring_items->clear();
+}
+
+void
+lpetool_update_measuring_items(LpeTool *lc)
+{
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    for ( std::map<SPPath *, SPCanvasItem*>::iterator i = lc->measuring_items->begin();
+          i != lc->measuring_items->end();
+          ++i )
+    {
+        SPPath *path = i->first;
+        SPCurve *curve = path->getCurve();
+        Geom::Piecewise<Geom::D2<Geom::SBasis> > pwd2 = Geom::paths_to_pw(curve->get_pathvector());
+        Inkscape::Util::Unit const * unit = nullptr;
+        if (prefs->getString("/tools/lpetool/unit").compare("")) {
+            unit = unit_table.getUnit(prefs->getString("/tools/lpetool/unit"));
+        } else {
+            unit = unit_table.getUnit("px");
+        }
+        double lengthval = Geom::length(pwd2);
+        lengthval = Inkscape::Util::Quantity::convert(lengthval, "px", unit);
+        gchar *arc_length = g_strdup_printf("%.2f %s", lengthval, unit->abbr.c_str());
+        sp_canvastext_set_text (SP_CANVASTEXT(i->second), arc_length);
+        set_pos_and_anchor(SP_CANVASTEXT(i->second), pwd2, 0.5, 10);
+        // TODO: must we free arc_length?
+    }
+}
+
+void
+lpetool_show_measuring_info(LpeTool *lc, bool show)
+{
+    std::map<SPPath *, SPCanvasItem*>::iterator i;
+    for (i = lc->measuring_items->begin(); i != lc->measuring_items->end(); ++i) {
+        if (show) {
+            sp_canvas_item_show(i->second);
+        } else {
+            sp_canvas_item_hide(i->second);
+        }
+    }
+}
+
+}
+}
+}
+
+/*
+  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 :