+ if (ValueNode_BLineCalcWidth::Handle bline_width = ValueNode_BLineCalcWidth::Handle::cast_dynamic(value_desc.get_value_node()))
+ {
+ Real old_width((*bline_width)(get_time()).get(Real()));
+ Real new_width(value.mag());
+ int scale_index(bline_width->get_link_index_from_name("scale"));
+ Real scale((*(bline_width->get_link(scale_index)))(get_time()).get(Real()));
+ if (!(canvas_interface()->change_value(synfigapp::ValueDesc(bline_width,scale_index),
+ new_width * scale / old_width)))
+ return false;
+ }