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> I started with a version in "C" with a multitude of stroke painted 
> areas, which was easier to approach. Then I read Ucamco.com's "Gerber 
> Format Application Note: Painting Considered Harmful." Not wishing to be 
> "beyond contempt" I started again with C++/Boost, and had a fairly quick 
> time of it using polygon inflation/deflation, union, and intersection 
> C++ operators. There are only a few dozen lines of polygon code to do 
> the whole job, and this solution is much more reliable. I would not wish 
> to try again without Boost, or some suitable replacement library.

Sounds reasonable, algorithms are most often hard to implement.

Another geometrical library I read about is cgal, it have an impressive developer list.