[plt-scheme] How to crop images?

From: zen1986 at gmail.com (zen1986 at gmail.com)
Date: Wed May 14 21:19:11 EDT 2008

Hi everyone,
I am doing a board game and want to put arbitrary background to
arbitrary tile shapes.
I have tried using bitmap. but it seems it can only create a
rectangular background, while I want arbitrary shape, say triangle,
So I wonder if I can get any help here.

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