Merge branch 'nikitakit_smoothbline' into nikitakit_ducks

[synfig.git] / synfig-studio / src / gtkmm / canvasview.cpp

diff --git a/synfig-studio/src/gtkmm/canvasview.cpp b/synfig-studio/src/gtkmm/canvasview.cpp
index 5afa535..95fe556 100644 (file)
--- a/synfig-studio/src/gtkmm/canvasview.cpp
+++ b/synfig-studio/src/gtkmm/canvasview.cpp
@@ -35,6 +35,7 @@
 
 #include <ETL/clock>
 #include <sstream>
+#include <math.h>
 
 #include <gtkmm/paned.h>
 #include <gtkmm/scale.h>
@@ -2882,10 +2883,20 @@ CanvasView::on_duck_changed(const synfig::Point &value,const synfigapp::ValueDes
 
        if (ValueNode_BLineCalcVertex::Handle bline_vertex = ValueNode_BLineCalcVertex::Handle::cast_dynamic(value_desc.get_value_node()))
        {
-               ValueNode_BLine::Handle bline = ValueNode_BLine::Handle::cast_dynamic(bline_vertex->get_link(bline_vertex->get_link_index_from_name("bline")));
+               ValueNode_BLine::Handle bline = ValueNode_BLine::Handle::cast_dynamic(bline_vertex->get_link("bline"));
                Real radius = 0.0;
-               Real amount = synfig::find_closest_point((*bline)(get_time()), value, radius, bline->get_loop());
-               return canvas_interface()->change_value(synfigapp::ValueDesc(bline_vertex,bline_vertex->get_link_index_from_name("amount")), amount);
+               if (((*(bline_vertex->get_link("loop")))(get_time()).get(bool()))){
+                       Real amount_old((*(bline_vertex->get_link("amount")))(get_time()).get(Real()));
+                       Real amount_new = synfig::find_closest_point((*bline)(get_time()), value, radius, bline->get_loop());
+                       Real difference = fmod( fmod(amount_new - amount_old, 1.0) + 1.0 , 1.0);
+                                                       //fmod is called twice to avoid negative values
+                       if (difference > 0.5) difference=difference-1.0;
+                       return canvas_interface()->change_value(synfigapp::ValueDesc(bline_vertex,bline_vertex->get_link_index_from_name("amount")), amount_old+difference);
+
+               } else {
+                       Real amount = synfig::find_closest_point((*bline)(get_time()), value, radius, bline->get_loop());
+                       return canvas_interface()->change_value(synfigapp::ValueDesc(bline_vertex,bline_vertex->get_link_index_from_name("amount")), amount);
+               }
        }
 
        if (ValueNode_BLineCalcTangent::Handle bline_tangent = ValueNode_BLineCalcTangent::Handle::cast_dynamic(value_desc.get_value_node()))