UnionRegionRect

Computes the Boolean union of a region and a rectangle.

Declaration

ibool NAPI GA_regionFuncs::UnionRegionRect(
GA_region *r1,
const GA_rect *r2)

Prototype In

snap/graphics.h

Parameters

r1 | Region with which r2 is unioned, and also becomes the result region.
r2 | Rectangle to be unioned with r1

Return Value

True if the union is valid, false if an empty region was created.

Description

Computes the Boolean union of a region r1 and rectangle r2, computing the resulting region in r1, which may result in an empty region. If you need to retain the value of r1, you need to first copy r1 to a temporary region.

This routine is faster than using UnionRegion if the region to be unioned is a simple rectangle rather than a complex region.

See Also

DiffRegion, SectRegion, UnionRegion, UnionRegionOfs

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