How to Draw Band segment of the line

Discussion created by farway on Dec 20, 2012
Excuse me .
   I am a programmer from China and please forgive my poor English.
   These days I am trying to do a function to draw a line with band segment or arc,or a  polygon with ring,just like the same function of ArcMap.But i found it seems make no use  no matter i use the interface of IDisplayFeedback or IRubber.
   Is there some easy way to solve this problem?