Add a member to check if the value node is invertible

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

diff --git a/synfig-studio/trunk/src/gtkmm/canvasview.cpp b/synfig-studio/trunk/src/gtkmm/canvasview.cpp
index 50789a9..a76b1a0 100644 (file)
--- a/synfig-studio/trunk/src/gtkmm/canvasview.cpp
+++ b/synfig-studio/trunk/src/gtkmm/canvasview.cpp
@@ -2890,7 +2890,13 @@ CanvasView::on_duck_changed(const synfig::Point &value,const synfigapp::ValueDes
        if (ValueNode_Scale::Handle scale_value_node = ValueNode_Scale::Handle::cast_dynamic(value_desc.get_value_node()))
        {
                int link_index(scale_value_node->get_link_index_from_name("link"));
-               return canvas_interface()->change_value(synfigapp::ValueDesc(scale_value_node,link_index), scale_value_node(t, value));
+               if(scale_value_node->is_invertible(get_time()))
+                       return canvas_interface()->change_value(
+                               synfigapp::ValueDesc(scale_value_node,link_index),
+                                       scale_value_node->get_inverse(get_time(), value)
+                                       );
+               else
+                       return false;
        }
 
        switch(value_desc.get_value_type())
@@ -2914,6 +2920,18 @@ CanvasView::on_duck_angle_changed(const synfig::Angle &rotation,const synfigapp:
                return canvas_interface()->change_value(synfigapp::ValueDesc(bline_tangent,offset_index), old_offset + rotation);
        }
 
+       if (ValueNode_Scale::Handle scale_value_node = ValueNode_Scale::Handle::cast_dynamic(value_desc.get_value_node()))
+       {
+               int link_index(scale_value_node->get_link_index_from_name("link"));
+               if(scale_value_node->is_invertible(get_time()))
+                       return canvas_interface()->change_value(
+                               synfigapp::ValueDesc(scale_value_node,link_index),
+                                       scale_value_node->get_inverse(get_time(), rotation)
+                                       );
+               else
+                       return false;
+
+       }
        // \todo will this really always be the case?
        assert(value_desc.get_value_type() == ValueBase::TYPE_ANGLE);
        return canvas_interface()->change_value(value_desc, value_desc.get_value(get_time()).get(Angle()) + rotation);