两个UIBezierPaths交集作为UIBezierPath [英] Two UIBezierPaths intersection as a UIBezierPath

问题描述

我有两个 UIBezierPath s，一个代表图像部分的多边形，另一个是要在其上绘制的路径。

I have two UIBezierPaths, one that represents the polygon of part of an image and the other is a path to be drawn on top of it.

我需要找到它们之间的交点，这样只有这个交叉区域内的点才会被着色。

I need to find the intersection between them so that only the point that are inside this intersection area will be colored.

UIBezierPath 中是否有方法可以在两条路径之间找到交叉点或新路径？

Is there a method in UIBezierPath that can find intersection points - or a new path - between two paths ?

推荐答案

我写了一个UIBezierPath库，它允许你根据交叉路径将给定的闭合路径切割成子形状。它基本上完全符合您的要求： https://github.com/adamwulf/ClippingBezier

I wrote a UIBezierPath library that will let you cut a given closed path into sub shapes based on an intersecting path. It'll do essentially exactly what you're looking for: https://github.com/adamwulf/ClippingBezier

NSArray<UIBezierPath*>* componentShapes = [shapePath uniqueShapesCreatedFromSlicingWithUnclosedPath:scissorPath];

或者，您也可以找到交叉点：

Alternatively, you can also just find the intersection points:

NSArray* intersections = [scissorPath findIntersectionsWithClosedPath:shapePath andBeginsInside:nil];

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