iOS CoreGraphics CGLineCap 枚举值含义

CoreGraphics 的CGPath 定义了一个枚举值

typedef CF_ENUM(int32_t, CGLineCap) {
    kCGLineCapButt,
    kCGLineCapRound,
    kCGLineCapSquare
};

kCGLineCapButt

A line with a squared-off end. Quartz draws the line to extend only to the exact endpoint of the path. This is the default.

该属性值指定不绘制端点， 线条结尾处直接结束。这是默认值。

kCGLineCapRound

A line with a rounded end. Quartz draws the line to extend beyond the endpoint of the path. The line ends with a semicircular arc with a radius of 1/2 the line’s width, centered on the endpoint.

该属性值指定绘制圆形端点， 线条结尾处绘制一个直径为线条宽度的半圆

kCGLineCapSquare

A line with a squared-off end. Quartz extends the line beyond the endpoint of the path for a distance equal to half the line widt

该属性值指定绘制方形端点。

线条结尾处绘制半个边长为线条宽度的正方形。需要

说明的是，这种形状的端点与“butt”形状的端点十分相似，

只是采用这种形式的端点的线条略长一点而已

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