MGL_unionRegionRect

Computes the Boolean union of a region and a rectangle.

Declaration

ibool MGLAPI MGL_unionRegionRect(
    region_t *r1,
    const rect_t *r2)

Prototype In

mgraph.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 MGL_unionRegion if the region to be unioned is a simple rectangle rather than a complex region.

See Also

MGL_diffRegion, MGL_sectRegion, MGL_unionRegion, MGL_unionRegionOfs

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