以特定角度连接的线具有尖顶点而不是圆角 [英] Joined lines at certain angles have pointed vertexes instead of rounded

问题描述

我的应用程式可让您使用各种工具绘图。其中一个让你做一个角度：你敲三次，然后为你绘制一个角度。不幸的是，它变得非常尖锐，但随后在某些角度再次圆角出于某种原因。我正在使用

My app allows you to draw using a variety of tools. One of them lets you make an angle: you tap three times, then an angle is drawn for you. Unfortunately, it gets really pointy but then rounded again at certain angles for some reason. I'm using

CGContextSetLineCap(context, kCGLineCapRound);

这里是一张图片来说明我在说什么：

Here is a picture to exemplify what I'm talking about:

大多数情况下，我所做的是：

For the most part, all I do is:

CGContextMoveToPoint(context, first.x, first.y);
CGContextAddLineToPoint(context, second.x, second.y);
CGContextAddLineToPoint(context, third.x, third.y);

然后笔画。

推荐答案

That's controlled by your line join style, not your line cap style.

CGContextSetLineJoin(context, kCGLineJoinRound);

默认线连接样式是斜角，看起来像是你击中斜角限制是为什么它在某个角度变圆。 （请参见 CGContextSetMiterLimit ）。

The default line join style is miter, and it looks like you're hitting the miter limit, which is why it becomes round at some angle. (See CGContextSetMiterLimit).

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