Union UIBezierPaths而不是Apend路径 [英] Union UIBezierPaths rather than apend path

问题描述

我有一个应用程序，我在其中使用UIBezierPath并通过一系列appendPath：调用将其用作画笔。在经历了几次并且具有非常复杂的刷子形状之后，内存耗尽并且应用程序停止运行。我真正想做的是完全一样的联合，就像Paint Code一样，但我找不到任何方法这样做。

I have an app where I take a UIBezierPath and use it as a brush by a series of appendPath: calls. After a few goes and with really complex brush shapes the memory runs out and the app grinds to a halt. What I really want to do is a full on union exactly like Paint Code does but I can't find any way of doing this.

我如何组合两个或更多UIBezierPaths？

How would I go about unioning two or more UIBezierPaths?

编辑：

以下是我想要动态实现的视觉效果。

Here is a visual of what I want to achieve dynamically.

在Paint Code中，您将采用两条路径并将它们重叠如下：

In Paint Code you take two paths and overlap them like this:

但是我想要将它们合并/合并为一个新的单一路径，如：

BUT I want to merge / union them into one new single path like:

请注意，在Paint Code的底部面板中，现在有一个单一形状的代码，这就是我想要的以编程方式获得1000条原始路径。

Note that in the bottom panel of Paint Code there is code for now one single shape and this is what I want to be able to get to programatically with maybe 1000 original paths.

推荐答案

最后解决方案!!

使用 https://github.com/adamwulf/ClippingBezier ，您可以找到交叉点点。然后你可以走过这条路，顺时针方向向左转，反之亦然，留在外面。然后，您可以使用点序列生成新路径。

Using https://github.com/adamwulf/ClippingBezier you can find the intersecting points. Then you can walk through the path, turning left if clockwise or vice-versa to stay on the outside. Then you can generate a new path using the sequence of points.

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