Adding upstream version 1.2.2.upstream/1.2.2upstream

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

1 files changed, 315 insertions, 0 deletions

diff --git a/src/live_effects/lpe-simplify.cpp b/src/live_effects/lpe-simplify.cpp
new file mode 100644
index 0000000..ccd1b6b
--- /dev/null
+++ b/src/live_effects/lpe-simplify.cpp
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gtkmm.h>
+
+#include "live_effects/lpe-simplify.h"
+
+#include "display/curve.h"
+#include "helper/geom.h"
+#include "path/path-util.h"
+#include "svg/svg.h"
+#include "ui/icon-names.h"
+#include "ui/tools/node-tool.h"
+
+#include <2geom/svg-path-parser.h>
+
+// TODO due to internal breakage in glibmm headers, this must be last:
+#include <glibmm/i18n.h>
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+LPESimplify::LPESimplify(LivePathEffectObject *lpeobject)
+    : Effect(lpeobject)
+    , steps(_("Steps:"), _("Change number of simplify steps "), "steps", &wr, this, 1)
+    , threshold(_("Roughly threshold:"), _("Roughly threshold:"), "threshold", &wr, this, 0.002)
+    , smooth_angles(_("Smooth angles:"), _("Max degree difference on handles to perform a smooth"), "smooth_angles",
+                    &wr, this, 0.)
+    , helper_size(_("Helper size:"), _("Helper size"), "helper_size", &wr, this, 5)
+    , simplify_individual_paths(_("Paths separately"), _("Simplifying paths (separately)"), "simplify_individual_paths",
+                                &wr, this, false, "", INKSCAPE_ICON("on-outline"), INKSCAPE_ICON("off-outline"))
+    , simplify_just_coalesce(_("Just coalesce"), _("Simplify just coalesce"), "simplify_just_coalesce", &wr, this,
+                             false, "", INKSCAPE_ICON("on-outline"), INKSCAPE_ICON("off-outline"))
+{
+    registerParameter(&steps);
+    registerParameter(&threshold);
+    registerParameter(&smooth_angles);
+    registerParameter(&helper_size);
+    registerParameter(&simplify_individual_paths);
+    registerParameter(&simplify_just_coalesce);
+
+    threshold.param_set_range(0.0001, Geom::infinity());
+    threshold.param_set_increments(0.0001, 0.0001);
+    threshold.param_set_digits(6);
+
+    steps.param_set_range(0, 100);
+    steps.param_set_increments(1, 1);
+    steps.param_set_digits(0);
+
+    smooth_angles.param_set_range(0.0, 360.0);
+    smooth_angles.param_set_increments(10, 10);
+    smooth_angles.param_set_digits(2);
+
+    helper_size.param_set_range(0.0, 999.0);
+    helper_size.param_set_increments(5, 5);
+    helper_size.param_set_digits(2);
+
+    radius_helper_nodes = 6.0;
+    apply_to_clippath_and_mask = true;
+}
+
+LPESimplify::~LPESimplify() = default;
+
+void
+LPESimplify::doBeforeEffect (SPLPEItem const* lpeitem)
+{
+    if(!hp.empty()) {
+        hp.clear();
+    }
+    bbox = lpeitem->visualBounds();
+    radius_helper_nodes = helper_size;
+}
+
+Gtk::Widget *
+LPESimplify::newWidget()
+{
+    // use manage here, because after deletion of Effect object, others might still be pointing to this widget.
+    Gtk::Box *vbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_VERTICAL));
+    
+    vbox->set_border_width(5);
+    vbox->set_homogeneous(false);
+    vbox->set_spacing(2);
+    std::vector<Parameter *>::iterator it = param_vector.begin();
+    Gtk::Box * buttons = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_HORIZONTAL,0));
+    while (it != param_vector.end()) {
+        if ((*it)->widget_is_visible) {
+            Parameter * param = *it;
+            Gtk::Widget * widg = dynamic_cast<Gtk::Widget *>(param->param_newWidget());
+            if (param->param_key == "simplify_individual_paths" ||
+                    param->param_key == "simplify_just_coalesce") {
+                Glib::ustring * tip = param->param_getTooltip();
+                if (widg) {
+                    buttons->pack_start(*widg, true, true, 2);
+                    if (tip) {
+                        widg->set_tooltip_text(*tip);
+                    } else {
+                        widg->set_tooltip_text("");
+                        widg->set_has_tooltip(false);
+                    }
+                }
+            } else {
+                Glib::ustring * tip = param->param_getTooltip();
+                if (widg) {
+                    Gtk::Box * horizontal_box = dynamic_cast<Gtk::Box *>(widg);
+                    std::vector< Gtk::Widget* > child_list = horizontal_box->get_children();
+                    Gtk::Entry* entry_widg = dynamic_cast<Gtk::Entry *>(child_list[1]);
+                    entry_widg->set_width_chars(8);
+                    vbox->pack_start(*widg, true, true, 2);
+                    if (tip) {
+                        widg->set_tooltip_text(*tip);
+                    } else {
+                        widg->set_tooltip_text("");
+                        widg->set_has_tooltip(false);
+                    }
+                }
+            }
+        }
+
+        ++it;
+    }
+    vbox->pack_start(*buttons,true, true, 2);
+    if(Gtk::Widget* widg = defaultParamSet()) {
+        vbox->pack_start(*widg, true, true, 2);
+    }
+    return dynamic_cast<Gtk::Widget *>(vbox);
+}
+
+void
+LPESimplify::doEffect(SPCurve *curve)
+{
+    Geom::PathVector const original_pathv = pathv_to_linear_and_cubic_beziers(curve->get_pathvector());
+    gdouble size  = Geom::L2(bbox->dimensions());
+    //size /= Geom::Affine(0,0,0,0,0,0).descrim();
+    Path* pathliv = Path_for_pathvector(original_pathv);
+    if(simplify_individual_paths) {
+        size = Geom::L2(Geom::bounds_fast(original_pathv)->dimensions());
+    }
+    size /= sp_lpe_item->i2doc_affine().descrim();
+    for (int unsigned i = 0; i < steps; i++) {
+        if ( simplify_just_coalesce ) {
+            pathliv->Coalesce(threshold * size);
+        } else {
+            pathliv->ConvertEvenLines(threshold * size);
+            pathliv->Simplify(threshold * size);
+        }
+    }
+    Geom::PathVector result = Geom::parse_svg_path(pathliv->svg_dump_path());
+    generateHelperPathAndSmooth(result);
+    curve->set_pathvector(result);
+    update_helperpath();
+}
+
+void
+LPESimplify::generateHelperPathAndSmooth(Geom::PathVector &result)
+{
+    if(steps < 1) {
+        return;
+    }
+    Geom::PathVector tmp_path;
+    Geom::CubicBezier const *cubic = nullptr;
+    for (auto & path_it : result) {
+        if (path_it.empty()) {
+            continue;
+        }
+
+        Geom::Path::iterator curve_it1 = path_it.begin(); // incoming curve
+        Geom::Path::iterator curve_it2 = ++(path_it.begin());// outgoing curve
+        Geom::Path::iterator curve_endit = path_it.end_default(); // this determines when the loop has to stop
+        SPCurve *nCurve = new SPCurve();
+        if (path_it.closed()) {
+            // if the path is closed, maybe we have to stop a bit earlier because the
+            // closing line segment has zerolength.
+            const Geom::Curve &closingline =
+                path_it.back_closed(); // the closing line segment is always of type
+            // Geom::LineSegment.
+            if (are_near(closingline.initialPoint(), closingline.finalPoint())) {
+                // closingline.isDegenerate() did not work, because it only checks for
+                // *exact* zero length, which goes wrong for relative coordinates and
+                // rounding errors...
+                // the closing line segment has zero-length. So stop before that one!
+                curve_endit = path_it.end_open();
+            }
+        }
+        if(helper_size > 0) {
+            drawNode(curve_it1->initialPoint());
+        }
+        nCurve->moveto(curve_it1->initialPoint());
+        Geom::Point start = Geom::Point(0,0);
+        while (curve_it1 != curve_endit) {
+            cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it1);
+            Geom::Point point_at1 = curve_it1->initialPoint();
+            Geom::Point point_at2 = curve_it1->finalPoint();
+            Geom::Point point_at3 = curve_it1->finalPoint();
+            Geom::Point point_at4 = curve_it1->finalPoint();
+
+            if(start == Geom::Point(0,0)) {
+                start = point_at1;
+            }
+
+            if (cubic) {
+                point_at1 = (*cubic)[1];
+                point_at2 = (*cubic)[2];
+            }
+
+            if(path_it.closed() && curve_it2 == curve_endit) {
+                point_at4 = start;
+            }
+            if(curve_it2 != curve_endit) {
+                cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it2);
+                if (cubic) {
+                    point_at4 = (*cubic)[1];
+                }
+            }
+            Geom::Ray ray1(point_at2, point_at3);
+            Geom::Ray ray2(point_at3, point_at4);
+            double angle1 = Geom::deg_from_rad(ray1.angle());
+            double angle2 = Geom::deg_from_rad(ray2.angle());
+            if((smooth_angles  >= std::abs(angle2 - angle1)) && !are_near(point_at4,point_at3) && !are_near(point_at2,point_at3)) {
+                double dist = Geom::distance(point_at2,point_at3);
+                Geom::Angle angleFixed = ray2.angle();
+                angleFixed -= Geom::Angle::from_degrees(180.0);
+                point_at2 =  Geom::Point::polar(angleFixed, dist) + point_at3;
+            }
+            nCurve->curveto(point_at1, point_at2, curve_it1->finalPoint());
+            cubic = dynamic_cast<Geom::CubicBezier const *>(nCurve->last_segment());
+            if (cubic) {
+                point_at1 = (*cubic)[1];
+                point_at2 = (*cubic)[2];
+                if(helper_size > 0) {
+                    if(!are_near((*cubic)[0],(*cubic)[1])) {
+                        drawHandle((*cubic)[1]);
+                        drawHandleLine((*cubic)[0],(*cubic)[1]);
+                    }
+                    if(!are_near((*cubic)[3],(*cubic)[2])) {
+                        drawHandle((*cubic)[2]);
+                        drawHandleLine((*cubic)[3],(*cubic)[2]);
+                    }
+                }
+            }
+            if(helper_size > 0) {
+                drawNode(curve_it1->finalPoint());
+            }
+            ++curve_it1;
+            ++curve_it2;
+        }
+        if (path_it.closed()) {
+            nCurve->closepath_current();
+        }
+        tmp_path.push_back(nCurve->get_pathvector()[0]);
+        nCurve->reset();
+        delete nCurve;
+    }
+    result = tmp_path;
+}
+
+void
+LPESimplify::drawNode(Geom::Point p)
+{
+    double r = radius_helper_nodes;
+    char const * svgd;
+    svgd = "M 0.55,0.5 A 0.05,0.05 0 0 1 0.5,0.55 0.05,0.05 0 0 1 0.45,0.5 0.05,0.05 0 0 1 0.5,0.45 0.05,0.05 0 0 1 0.55,0.5 Z M 0,0 1,0 1,1 0,1 Z";
+    Geom::PathVector pathv = sp_svg_read_pathv(svgd);
+    pathv *= Geom::Scale(r) * Geom::Translate(p - Geom::Point(0.5*r,0.5*r));
+    hp.push_back(pathv[0]);
+    hp.push_back(pathv[1]);
+}
+
+void
+LPESimplify::drawHandle(Geom::Point p)
+{
+    double r = radius_helper_nodes;
+    char const * svgd;
+    svgd = "M 0.7,0.35 A 0.35,0.35 0 0 1 0.35,0.7 0.35,0.35 0 0 1 0,0.35 0.35,0.35 0 0 1 0.35,0 0.35,0.35 0 0 1 0.7,0.35 Z";
+    Geom::PathVector pathv = sp_svg_read_pathv(svgd);
+    pathv *= Geom::Scale(r) * Geom::Translate(p - Geom::Point(0.35*r,0.35*r));
+    hp.push_back(pathv[0]);
+}
+
+
+void
+LPESimplify::drawHandleLine(Geom::Point p,Geom::Point p2)
+{
+    Geom::Path path;
+    path.start( p );
+    double diameter = radius_helper_nodes;
+    if(helper_size > 0 && Geom::distance(p,p2) > (diameter * 0.35)) {
+        Geom::Ray ray2(p, p2);
+        p2 =  p2 - Geom::Point::polar(ray2.angle(),(diameter * 0.35));
+    }
+    path.appendNew<Geom::LineSegment>( p2 );
+    hp.push_back(path);
+}
+
+void
+LPESimplify::addCanvasIndicators(SPLPEItem const */*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
+{
+    hp_vec.push_back(hp);
+}
+
+
+}; //namespace LivePathEffect
+}; /* namespace Inkscape */
+
+/*
+  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 :