WFBezierCombinatorics

Adds 3 public methods to NSBezierPath for performing boolean operations on paths:

• (NSBezierPath *)WFUnionWithPath:(NSBezierPath *)path;

• (NSBezierPath *)WFIntersectWithPath:(NSBezierPath *)path;

• (NSBezierPath *)WFSubtractPath:(NSBezierPath *)path;

In all cases, the receiver and input paths are not modified. The returned result is a new path constructed by performing the boolean operation on the receiver and input path. A sample app illustrates the usage, which is quite simple.

Input Requirements:

• Input paths must be wound using the default NSNonZeroWindingRule
• Input paths must not be self-intersecting
• An input path may not have coincident edges or vertices with itself

Compilation Requirements:

This code requires ARC. If your project does not use ARC globally, you should enable it on a file-by-file bases for the “NSBezierPath+WFBezierCombinatorics.m” file.

Notes:

The output path will not contain elements of type NSClosePathElement. Sub-paths are implicitly closed by a line or arc with an endpoint at the same location as the initial moveTo element that started the path. The last sub-path in the output may (but is not guaranteed) to end with a moveTo element.