Add 'Show handles' LPE

(bzr r13341.1.139)

1 files changed, 211 insertions, 0 deletions

diff --git a/src/live_effects/lpe-show_handles.cpp b/src/live_effects/lpe-show_handles.cpp
new file mode 100644
index 000000000..7b2b445b7
--- /dev/null
+++ b/src/live_effects/lpe-show_handles.cpp
@@ -0,0 +1,211 @@
+/*
+ * Authors:
+ *   Jabier Arraiza Cenoz
+*
+* Copyright (C) Jabier Arraiza Cenoz 2014 <jabier.arraiza@marker.es>
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include <gtkmm.h>
+#include <glibmm/i18n.h>
+#include "live_effects/lpe-show_handles.h"
+#include "live_effects/parameter/parameter.h"
+#include <2geom/sbasis-to-bezier.h>
+#include <2geom/svg-path-parser.h>
+#include "helper/geom.h"
+#include "desktop-style.h"
+#include "style.h"
+#include "svg/svg.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+LPEShowHandles::LPEShowHandles(LivePathEffectObject *lpeobject)
+    : Effect(lpeobject),
+      nodes(_("Show nodes"), _("Show nodes"), "nodes", &wr, this, true),
+      handles(_("Show handles"), _("Show handles"), "handles", &wr, this, true),
+      originalPath(_("Show path"), _("Show path"), "originalPath", &wr, this, true),
+      scaleNodesAndHandles(_("Scale nodes and handles"), _("Scale nodes and handles"), "scaleNodesAndHandles", &wr, this, 10)
+{
+    registerParameter(dynamic_cast<Parameter *>(&nodes));
+    registerParameter(dynamic_cast<Parameter *>(&handles));
+    registerParameter(dynamic_cast<Parameter *>(&originalPath));
+    registerParameter(dynamic_cast<Parameter *>(&scaleNodesAndHandles));
+    scaleNodesAndHandles.param_set_range(0, 500.);
+    scaleNodesAndHandles.param_set_increments(1, 1);
+    scaleNodesAndHandles.param_set_digits(2);
+    strokeWidth = 1.0;
+}
+
+bool LPEShowHandles::alertsOff = false;
+
+/**
+ * Sets default styles to element
+ * this permanently remove.some styles of the element
+ */
+
+void LPEShowHandles::doOnApply(SPLPEItem const* lpeitem)
+{
+    if(!alertsOff) {
+        char *msg = _("The \"show handles\" path effect will remove any custom style on the object you are applying it to. If this is not what you want, click Cancel.");
+        Gtk::MessageDialog dialog(msg, false, Gtk::MESSAGE_QUESTION, Gtk::BUTTONS_OK_CANCEL, true);
+        gint response = dialog.run();
+        alertsOff = true;
+        if(response == GTK_RESPONSE_CANCEL) {
+            SPLPEItem* item = const_cast<SPLPEItem*>(lpeitem);
+            item->removeCurrentPathEffect(false);
+            return;
+        }
+    }
+    SPLPEItem* item = const_cast<SPLPEItem*>(lpeitem);
+    SPCSSAttr *css = sp_repr_css_attr_new ();
+    sp_repr_css_set_property (css, "stroke", "black");
+    sp_repr_css_set_property (css, "stroke-width", "1");
+    sp_repr_css_set_property (css, "stroke-linecap", "butt");
+    sp_repr_css_set_property(css, "fill", "none");
+
+    sp_desktop_apply_css_recursive(item, css, true);
+    sp_repr_css_attr_unref (css);
+}
+
+void LPEShowHandles::doBeforeEffect (SPLPEItem const* lpeitem)
+{
+    SPItem const* item = SP_ITEM(lpeitem);
+    strokeWidth = item->style->stroke_width.computed;
+}
+
+std::vector<Geom::Path> LPEShowHandles::doEffect_path (std::vector<Geom::Path> const & path_in)
+{
+    std::vector<Geom::Path> path_out;
+    Geom::PathVector const original_pathv = pathv_to_linear_and_cubic_beziers(path_in);
+    if(originalPath) {
+        for (unsigned int i=0; i < path_in.size(); i++) {
+            path_out.push_back(path_in[i]);
+        }
+    }
+    if(!outlinepath.empty()) {
+        outlinepath.clear();
+    }
+    generateHelperPath(original_pathv);
+    for (unsigned int i=0; i < outlinepath.size(); i++) {
+        path_out.push_back(outlinepath[i]);
+    }
+    return path_out;
+}
+
+void
+LPEShowHandles::generateHelperPath(Geom::PathVector result)
+{
+    if(!handles && !nodes) {
+        return;
+    }
+
+    Geom::CubicBezier const *cubic = NULL;
+    for (Geom::PathVector::iterator path_it = result.begin(); path_it != result.end(); ++path_it) {
+        //Si está vacío...
+        if (path_it->empty()) {
+            continue;
+        }
+        //Itreadores
+        Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
+        Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
+        Geom::Path::const_iterator curve_endit = path_it->end_default(); // this determines when the loop has to stop
+
+        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(nodes) {
+            drawNode(curve_it1->initialPoint());
+        }
+        while (curve_it1 != curve_endit) {
+            cubic = dynamic_cast<Geom::CubicBezier const *>(&*curve_it1);
+            if (cubic) {
+                if(handles) {
+                    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(nodes) {
+                drawNode(curve_it1->finalPoint());
+            }
+            ++curve_it1;
+            if(curve_it2 != curve_endit){
+                ++curve_it2;
+            }
+        }
+    }
+}
+
+void
+LPEShowHandles::drawNode(Geom::Point p)
+{
+    if(strokeWidth * scaleNodesAndHandles > 0.0) {
+        double diameter = strokeWidth * scaleNodesAndHandles;
+        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::Affine(diameter,0,0,diameter,0,0);
+        pathv += p - Geom::Point(diameter/2,diameter/2);
+        outlinepath.push_back(pathv[0]);
+        outlinepath.push_back(pathv[1]);
+    }
+}
+
+void
+LPEShowHandles::drawHandle(Geom::Point p)
+{
+    if(strokeWidth * scaleNodesAndHandles > 0.0) {
+        double diameter = strokeWidth * scaleNodesAndHandles;
+        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::Affine(diameter,0,0,diameter,0,0);
+        pathv += p - Geom::Point(diameter * 0.35,diameter * 0.35);
+        outlinepath.push_back(pathv[0]);
+    }
+}
+
+
+void
+LPEShowHandles::drawHandleLine(Geom::Point p,Geom::Point p2)
+{
+    Geom::Path path;
+    double diameter = strokeWidth * scaleNodesAndHandles;
+    if(diameter > 0.0 && Geom::distance(p,p2) > (diameter * 0.35)){
+        Geom::Ray ray2(p, p2);
+        p2 =  p2 - Geom::Point::polar(ray2.angle(),(diameter * 0.35));
+    }
+    path.start( p );
+    path.appendNew<Geom::LineSegment>( p2 );
+    outlinepath.push_back(path);
+}
+
+}; //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 :