> If I understand the goal, you could render to one bitmap that has an > alpha channel, and then check whether the pixel under the mouse ends up > with a non-zero alpha.
That's a good simplification. Thanks! I had kind of been hoping that there was an alternative approach that I was missing, but this at least will save one drawing. /David -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
