How to implement boolean operations on bezier paths, Part 1 swift bezierpath 相交 get points(https://www.jianshu.com/p/885c08466ed2)(https://github.com/erica/iOS-Drawing/blob/master/C07%20A%20-%20Mask:Blur/Quartz%20Book%20Pack/Bezier/UIBezierPath%2BElements.m)(https://codeday.me/bug/...