[Chicken-users] Computational geometry for chicken?

[Matthew Welland]

I don't see anything in the eggs list that does the trick so ....

I need some basic polygon computational geometry operations, namely; AND, 
OR, XOR, NOT. Any suggestions how to go about this? I have some slow, 
incomplete and buggy code I wrote a long time ago that I could resurrect and 
slap into shape but I think a proper egg accessing a C library would be a 
better solution.

I'm guessing the right answer is to eggify http://www.cgal.org/ but that 
looks like a daunting task. 

Suggestions, insights and pointers appreciated.

Free book on the subject for anyone interested:

http://www.freetechbooks.com/computational-geometry-methods-and-
applications-t557.html