CGAL users discussion list

[NickParkerPrint <>]

Hi everyone, 

I have a Java program working with strictly simple polygons with holes as
described in the CGAL docs for straight_skeleton_2
http://doc.cgal.org/latest/Straight_skeleton_2/index.html, and I need to
create several offsets from each of these polygons. I'm hoping to somehow
interface CGAL's functionality with my Java project. 

I've read a little about SWIG and JNI, but I haven't even got CGAL to
install yet, and don't really know how to approach the issue. I'd rather not
ship all of Boost and the other ~15gb of CGAL dependencies with my currently
tiny code base. 

Also, since I need to create multiple offsets from each polygon with holes
(and I do care about speed), I need to reuse the skeleton somehow. I'm
thinking either I could add a function to the CGAL side of things to take in
a set of offset distances and return a set of offset polygons, or I could
have a sort of "skeleton library" which I could add a polygon-with-holes to
and get back a unique id from some hash function so that when I want offsets
of that polygon I can tell the CGAL side which skeleton to generate from. 

Sorry this is somewhat unstructured, I can't find any good implementations
of offset polygons in native Java. CampSkeleton gets close, but can't handle
parallel edge collisions or simultaneous collisions of >3 edges, both of
which happen all the time in my project. 

Thanks for any guidance, 
-Nick Parker



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