Features of GPC
The following summarises the features and operations on polygons supported by GPC:
- GPC can compute the following clip operations: difference, intersection, exclusive-or and union.
- Polygons may comprise multiple disjoint contours.
- Contour vertices may be specified as clockwise or anticlockwise.
- Contours may be convex, concave or self-intersecting.
- Contours may be nested. In other words, polygons may have holes.
- The clip operation output from GPC is a set of polygon contours or tristrips.
- Holes and external contours are differentiated in GPC's output.
- Coincident edges and degenerate regions are handled correctly.
Read more about this topic: General Polygon Clipper
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