直线在180度路径中时出现意外的LineJoinStyle行为 [英] Unexpected LineJoinStyle behavior when lines in path at 180 degrees

问题描述

当一行刚好回到上一行时，我在UIBezierPath中得到了一个裁剪的LineJoin。如果我将第二行调整一个像素，则LineJoin的行为将达到预期。代码如下：

I'm getting a clipped LineJoin in a UIBezierPath when one line comes back exactly over the previous line. If I adjust the second line by one pixel, the LineJoin behaves as expected. Here's the code:

UIBezierPath *path = [UIBezierPath bezierPath];
[path setLineWidth:10.0f];
[path setLineCapStyle:kCGLineCapRound];
[path setLineJoinStyle:kCGLineJoinRound];
[path moveToPoint:CGPointMake(100, 100)];
[path addLineToPoint:CGPointMake(200, 100)];
[path addLineToPoint:CGPointMake(150, 100)];
[path moveToPoint:CGPointMake(100, 120)];
[path addLineToPoint:CGPointMake(200, 120)];
[path addLineToPoint:CGPointMake(150, 121)];
[[UIColor redColor] setStroke];
[path stroke];

显示的内容如下：

这是一个错误吗？
如果没有，有什么方法可以使顶部路径LineJoin取整？ （不用弄乱点）

Is this a bug? If not, is there some way to get the top path LineJoin to be rounded? (without fudging the points)

当我从触摸输入创建UIBezierPath时出现了这种情况，而有时又会乱涂乱画。

This came up when I made a UIBezierPath from 'touch-input', and while scribbling around sometimes this happened.

推荐答案

此问题已在iOS 7中修复。
Open Radar也已更新。

This is fixed in iOS 7. Open Radar also updated.

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