+ // then patch up the tangents for the vertices we've moved
+ DuckList duck_list(duckmatic->get_duck_list());
+ for (iter=selected_ducks.begin(); iter!=selected_ducks.end(); ++iter)
+ {
+ etl::handle<Duck> duck(*iter);
+ if ((duck->get_type() == Duck::TYPE_VERTEX || duck->get_type() == Duck::TYPE_POSITION) &&
+ duck->get_value_desc().parent_is_value_node())
+ {
+ ValueNode_BLineCalcVertex::Handle bline_vertex(ValueNode_BLineCalcVertex::Handle::cast_dynamic(duck->get_value_desc().get_value_node()));
+ if (bline_vertex)
+ {
+ ValueNode_Composite::Handle value_node_composite(ValueNode_Composite::Handle::cast_dynamic(duck->get_value_desc().get_parent_value_node()));
+ if (value_node_composite &&
+ value_node_composite->get_type() == ValueBase::TYPE_BLINEPOINT)
+ {
+ int t1_index(value_node_composite->get_link_index_from_name("t1"));
+ int t2_index(value_node_composite->get_link_index_from_name("t2"));
+ ValueNode::Handle t1_value_node(value_node_composite->get_link(t1_index));
+ ValueNode::Handle t2_value_node(value_node_composite->get_link(t2_index));
+ ValueNode_BLineCalcTangent::Handle bline_tangent_1(ValueNode_BLineCalcTangent::Handle::cast_dynamic(t1_value_node));
+ ValueNode_BLineCalcTangent::Handle bline_tangent_2(ValueNode_BLineCalcTangent::Handle::cast_dynamic(t2_value_node));
+
+ if (bline_tangent_1 || bline_tangent_2)
+ {
+ synfig::Real radius = 0.0;
+ ValueNode_BLine::Handle bline(ValueNode_BLine::Handle::cast_dynamic(bline_vertex->get_link(bline_vertex->get_link_index_from_name("bline"))));
+ Real amount = synfig::find_closest_point((*bline)(time), duck->get_point(), radius, bline->get_loop());
+
+ // we need to update the position of the tangent ducks - but how do we find these ducks?
+ // this is a brute force search - but is there a better way to do it?
+ if (bline_tangent_1)
+ {
+ Vector tangent = (*bline_tangent_1)(time, amount).get(Vector());
+ DuckList::iterator iter;
+ for (iter=duck_list.begin(); iter!=duck_list.end(); iter++)
+ if ((*iter)->get_value_desc().get_value_node() == t1_value_node)
+ (*iter)->set_point(tangent);
+ }
+
+ if (bline_tangent_2)
+ {
+ Vector tangent = (*bline_tangent_2)(time, amount).get(Vector());
+ DuckList::iterator iter;
+ for (iter=duck_list.begin(); iter!=duck_list.end(); iter++)
+ if ((*iter)->get_value_desc().get_value_node() == t2_value_node)
+ (*iter)->set_point(tangent);
+ }
+ }
+ }
+ }
+ }
+ }
+