[racket] Racket/gui : How to rotate a bitmap% ?

From: Jyu 。 (julien-0659 at hotmail.fr)
Date: Mon May 2 17:30:47 EDT 2011

Hi ! 
For a school project who use the chipmunk 2D physics library, I need to rotate an image (instance of bitmap%)..I searched for a long time but I have not found, someone know how can I do this ?
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