斜接长度是指线壁在联接内部的交点与线壁在联接外部的交点之间的距离。
The miter length is the distance from the intersection of the line walls on the inside of the join to the intersection of the line walls outside of the join.
计算交点的数目后，如果结果为零，则说明该点位于路径外部。
After counting the crossings, if the result is zero then the point is outside the path.
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