如何填充两个UIBezierPath之间的空间

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。 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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