只有当画笔宽度为1或更小(以设备单位计算)时才有效。
Valid only when the pen width is 1 or less, in device units.
直线(画笔宽度为10)和矩形会使用线形渐层笔刷填满。
A line (with pen width 10) and an ellipse are filled with the linear gradient brush.
大概的公式为：初始周框会根据画笔宽度膨胀，而这个结果是乘以斜接限制，加上某些要考虑端点的额外边界。
The approximate formula is: the initial bounding rectangle is inflated by pen width, and this result is multiplied by the miter limit, plus some additional margin to allow for end caps.
在用这些工具进行绘图时，通过鼠标操作自动设置坐标点和工具类型(比如方框)，并通过GUI环境选择画笔和笔画宽度。
In drawing with those tools, the mouse automatically sets the coordinate points and the type of tool, such as a box, and selects the pen and stroke for you via a GUI environment.
在cairo中，也有画笔形状的概念，这由笔画宽度来表达。
With Cairo there is also a notion of a brush tip expressed through the stroke width.
在cairo中，也有画笔形状的概念，这由笔画宽度来表达。
With Cairo there is also a notion of a brush tip expressed through the stroke width.
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