Clipper (gb.clipper)
这个静态类实现了剪裁方法。
This class is static.
Constants
Static methods
Polygon fill types
Each polygon or array of polygons must have a fill type specified when calling
one of the clipping methods:
Difference,
Union,
Intersection,
ExclusiveOr.
That fill type is a value among one of the following constant:
See this link for more details:
Polygon fill types on the Clipper Library web site.