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.

youdao

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.

youdao

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.

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