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Important: The information in this document is obsolete and should not be used for new development.

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Inside Macintosh: Imaging With QuickDraw /
Chapter 3 - QuickDraw Drawing / QuickDraw Drawing Reference
Routines / Creating and Managing Rectangles


SectRect

To determine whether two rectangles intersect, you can use the SectRect function.

FUNCTION SectRect (src1,src2:\xDDRect; VAR dstRect: Rect): Boolean;
src1
The first of two rectangles to test for intersection.
src2
The second of two rectangles to test for intersection.
dstRect
The rectangle marking the intersection of the first two rectangles.
DESCRIPTION
The SectRect function calculates the rectangle that delineates the intersection of the two rectangles you specify in the src1 and src2 parameters. The SectRect function returns the area of intersection in the dstRect parameter and a function result of TRUE if they intersect or FALSE if they don't. Rectangles that touch at a line or a point are not considered intersecting, because their intersection rectangle (actually, in this case, an intersection line or point) doesn't enclose any pixels in the bit image.

If the rectangles don't intersect, the destination rectangle is set to (0,0,0,0). The SectRect procedure works correctly even if one of the source rectangles is also the destination.


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© Apple Computer, Inc.
7 JUL 1996