[racket] teachpack/htdp/image

I am impressed by ease of use teachpack/htdp/image. I have looked around,
but have not found a tool create an image whose pinhole is at the north-west
of that of an image haviing its pinhole in the centre. May be a stupid
question. Of course I have seen nw:rectangle, but I have not seen such thing
as nw:star. Is it possible (and derirable) to provide something like
(move-pinhole-nw image)?
Jos
 

 

 
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