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Fotiman - 7:24 pm on Jan 18, 2013 (gmt 0)
I would think you could still do that with one big area. Lets simplify the example: imagine if your area was just a 5px x 3px rectangular shape (15 points total area).
01234
+-----+
0|.....|
1|.....|
2|.....|
+-----+
Given a point within that area, you could map it to a specific sub-division:
01234
+-----+
0|AABBC|
1|ABBCC|
2|BBCCC|
+-----+
For example, shape "A" is somewhat triangular in shape and consists of 3 points:
0,0
1,0
0,1
Shape "B" is like a diagonal line consisting of points:
2,0
3,0
1,1
2,1
0,2
1,2
And Shape "C" is also triangular, consisting of points:
4,0
3,1
4,1
2,2
3,2
4,2
So, given any point, you can tell exactly which shape it is.