paper.js has a decent implementation for boolean path operations. It uses fat line clipping for finding the intersections between two Bézier curves. Here is the

paper.js has a decent implementation for boolean path operations. It uses fat line clipping for finding the intersections between two Bézier curves. Here is the research paper that describes the algorithm: http://nishitalab.org/user/nis/cdrom/cad/CAGD90Curve.pdf http://nishitalab.org/user/nis/cdrom/cad/CAGD90Curve.pdf