[racket] rotate an image using 2htdp/image

From: Mathew Kurian (bluejamesbond at gmail.com)
Date: Mon Jul 19 16:37:43 EDT 2010

Just want to clear up things....the how can adjust the pinhole or the
rotation center?
 And Stephen Bloch, can you explain in a bit more detail...seems like that
is exactly what i am looking for...but i am having challenging understanding
the concept.
 I am making trying to make a shooter game and move the mans arm up and
down. What is the best way I can achieve this?

PS: All this is in 2htdp/image
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