+ case ValueBase::TYPE_REAL:
+ {
+ Real old_length = (*bline_tangent)(get_time()).get(Real());
+ Real new_length = value.mag();
+ int scale_index(bline_tangent->get_link_index_from_name("scale"));
+ int fixed_length_index(bline_tangent->get_link_index_from_name("fixed_length"));
+ Real scale((*(bline_tangent->get_link(scale_index)))(get_time()).get(Real()));
+ bool fixed_length((*(bline_tangent->get_link(fixed_length_index)))(get_time()).get(bool()));
+ if (fixed_length)
+ return canvas_interface()->change_value(synfigapp::ValueDesc(bline_tangent,scale_index), new_length);
+ if (old_length == 0)
+ return true;
+ return canvas_interface()->change_value(synfigapp::ValueDesc(bline_tangent,scale_index), new_length * scale / old_length);
+ }
+
+ case ValueBase::TYPE_ANGLE:
+ assert(0); // doesn't happen?
+ break;
+
+ case ValueBase::TYPE_VECTOR:
+ Vector old_tangent = (*bline_tangent)(get_time()).get(Vector());
+ Angle old_angle = old_tangent.angle();
+ Real old_length = old_tangent.mag();