Clipper (gb.clipper)

This static class implements the clipping methods.

Constants

FillEvenOdd	Constant that represents the "Even-odd" polygon fill rule.
FillNegative	Constant that represents the "Negative" polygon fill rule.
FillNonZero	Constant that represents the "Non-Zero" or "Winding" polygon fill rule.
FillPositive	Constant that represents the "Positive" polygon fill rule.
FillWinding	Constant that represents the "Non-Zero" or "Winding" polygon fill rule.
JoinMiter	This constant represents a "miter" join type.
JoinRound	This constant represents a "round" join type.
JoinSquare	This constant represents a "square" join type.

Static methods

Clean	Removes vertices:
Difference	Compute the difference between Polygons and Clip and return it.
ExclusiveOr	Compute the exclusive or between Polygons and Clip and return it.
Intersection	Compute the intersection between Polygons and Clip and return it.
Offset	This function offsets the Polygons parameter by the Delta amount. Positive delta values expand outer polygons and contract inner 'hole' polygons. Negative deltas do the reverse.
Simplify	Removes self-intersections from the supplied Polygons (by performing a boolean union operation using the nominated Fill type).
Union	Compute the union between Polygons and Clip and return it.

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:

• Clipper.FillEvenOdd.

• Clipper.FillWinding or Clipper.FillNonZero.

• Clipper.FillNegative.

• Clipper.FillPositive.

See this link for more details: Polygon fill types on the Clipper Library web site.