This library primarily performs the boolean clipping operations - intersection, union, difference & xor - on 2D polygons. It also performs polygon offsetting. The library handles complex (self-intersecting) polygons, polygons with holes and polygons with overlapping co-linear edges. Input polygons for clipping can use EvenOdd, NonZero, Positive and Negative filling modes. The clipping code is based on the Vatti clipping algorithm, and outperforms other clipping libraries.