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## Region algebra

The following functions provide support for performing Boolean arithmetic operations on complex regions to produce new complex regions. These Boolean arithmetic routines form the heart of the SciTech MGL complex clip region support, and allow you to construct arbitrarily complex shapes from the simple region primitives that the SciTech MGL can generate for you.

MGL_diffRegion | MGL_diffRegionRect
MGL_emptyRegion | MGL_equalRegion
MGL_offsetRegion | MGL_optimizeRegion
MGL_ptInRegionCoord | MGL_sectRegion
MGL_sectRegionRect | MGL_unionRegion
MGL_unionRegionOfs | MGL_unionRegionRect

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