how to change the RectanglarLine shape?

Sep 5, 2014 at 3:54 AM
I want to change the RectanglarLine shape
meet the follow purpose:

the connect line of the shape will not across this shape at least.

for example,

if the connect control point is the leftcenter , so the VertexBending of this section maybe should be VertexBending.Left. when this shape change direction, so VertexBending will change direction.

How to chieve this requirement?