This algorithm can be used to calculate not only intersection but also set-theoretic differences and union of two polygons .
该算法不仅可以求多边形的“交”，而且可以求多边形的“并”和“差”。
This algorithm can be used to calculate not only intersection but also set-theoretic differences and union of two polygons .
该算法不仅可以求多边形的“交”，而且可以求多边形的“并”和“差”。
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