There are a number of ways to do this. One is demonstrated in the
Carbon Sketch sample where you basically create a one point square,
draw each polygon into the context, and detect whether or not the
polygon colors the context at that point.
Sorry, I flubbed this one.
You create a bitmap context that is one point square. You set up the
transform in that context so that it covers the point where the mouse
went down. You then draw the polygons into that context and detect
whether or not the pixel of that context changes color.
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