UnionRect

UnionRect Find smallest rectangle enclosing two rectangles

#include <Quickdraw.h> Quickdraw

void UnionRect(rect1, rect2, resultRect );

Rect *rect1 ; addresses of two Rect ...

Rect *rect2 ; ... structures to find union

Rect * resultRect ; receives union rectangle

UnionRect finds the smallest rectangle that will enclose two specified

rectangles.

rect1 and . . .

rect2 are the addresses of two 8-byte Rect structures. They should use

the same coordinate system.

resultRect is the address of a third Rect structure. Upon return, it will contain

the coordinates of a rectangle that encloses both rect1 and rect2 .

Notes: The resultRect will define the minimum rectangle. It basically copies the

topLeft coordinate of the highest, leftmost rectangle and the bottomRight

coordinate of the lowest, rightmost rectangle. In the figures, the

dotted-line rectangles represent the union of the two interior rectangles:

It is OK to specify resultRect as the same rectangle as either of rect1 or

rect2 . For instance, the following code would find the union of rectangles

A and B, and store its coordinates into rectangle A, overwriting the original

value:

UnionRect( &rA, &rB, &rA );

Referenced by (7):