vattis algorithm as in GPC c++ library

[TomCat]

I cannot even do a correct union of 3 rectangles in gpc , what could
be the reason?.
i put 1 polygon as clip polygon and 2 nondisjoint polygons as source
and then do a union op on them.I am not getting a proper result.
I presume my understanding of how to use gpc is wrong.
can some kind member of this group who knows how to use gpc help me
out.

I will try the new Clipper library, but i have to get embarcadero c
++(very expensive)

[Mahesh Naik MaheshNaik]

Write to ***@gmail.com if you want the fully debugged and rewritten GPC .--
Recursion free,2 major algorithmic bugs located and cured.Speeded up for heavy intersections.Runs very fast.BUT it works only for odd/even parity.
absolutely phokat.