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  • $\begingroup$ I love "such that I can calculate what color each intersection would be". Sounds like magic :) $\endgroup$ Commented Nov 19, 2014 at 4:04
  • $\begingroup$ @belisarius I have seen image processing magic from you before :) $\endgroup$ Commented Nov 19, 2014 at 4:49
  • 3
    $\begingroup$ Oh! But I was sober that day! I almost remember ... $\endgroup$ Commented Nov 19, 2014 at 4:58
  • $\begingroup$ You could use a binary encoding: assign each shape a colour that has exactly 1 nonzero bit, rasterize each on a black background, then use ImageAdd. But you can only distinguish up to 24 shapes. $\endgroup$ Commented Nov 19, 2014 at 6:40
  • $\begingroup$ Another problem with an image processing approach is that if two edges intersect at a small angle you will get a chain of disconnected pixels: i.sstatic.net/TmEtp.png $\endgroup$ Commented Nov 19, 2014 at 6:45