[racket] Annulus with dc%?

From: J. Ian Johnson (ianj at ccs.neu.edu)
Date: Fri Sep 20 13:51:41 EDT 2013

I'm trying to make some visuals for a slideshow presentation, and I want to have a ring with borders (inner and outer ring borders) to draw over another image, thus a transparent center is necessary.
I haven't been able to find a way to do this with the current API. Anyone have a suggestion (other than, "don't do that")?

Thanks,
-Ian

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