freebsd-ports/graphics/polyclipping/pkg-descr

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polyclipping - Polygon and line clipping and offsetting library.
The Clipper library performs clipping and offsetting for both
lines and polygons. All four boolean clipping operations are
supported - intersection, union, difference and exclusive-or.
Polygons can be of any shape including self-intersecting polygons.
WWW: https://sourceforge.net/projects/polyclipping/