如何填充两个UIBezierPath之间的空间 [英] How to fill space between two UIBezierPaths

问题描述

我正在绘制应用程序，它提供了具有可变线宽的绘制线，这取决于绘制速度。这种行为受到Paper app的启发。

I'm working on drawing application which provides drawing lines with variable line width which depends on drawing speed. This behavior inspired by Paper app.

我正在尝试实现的算法 - 绘制两条bezier路径，它们之间的距离可变。 索斯伯恩的回答中描述的解决方案。然后平滑路径并填充它们之间的距离。

Algorithm which I'm trying to implement -- draw two bezier path with variable distance between them. The solution which described in sosborn's answer. Then smooth paths and fill the distance between them.

实际上我并没有弄清楚如何填充路径之间的空间。

Actually I don't figured out how to fill space between paths.

推荐答案

您从2条贝塞尔曲线创建一条路径并填充它，如下所示：

You create a single path from the 2 bezier curves and fill it, like this:

NSBezierPath* path = [NSBezierPath bezierPath];

// Move to the start point
[path moveToPoint:startPt];

// Make the lower part of the curve
[path curveToPoint:endPt controlPoint1:cp1 controlPoint2:cp2];

// Make the upper part of the curve as part of the same path:
[path curveToPoint:startPt contorPoint1:cp3 controlPoint2:cp4];

// Now fill it
[path fill];

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