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Re: NSUnionRect

As documented, http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Miscellaneous/Foundation_Functions/Reference/reference.html#/ /apple_ref/c/func/NSUnionRect. Basically a 0 by 0 rectangle is considered to be non-existent for purposes of unioning; this enables a number of rect operations to be performed in tandem.

Returns the smallest rectangle that completely encloses both aRect and bRect. If one of the rectangles has 0 (or negative) width or height, a copy of the other rectangle is returned; but if both have 0 (or negative) width or height, the returned rectangle has its origin at (0.0, 0.0) and has 0 width and height. 

Ali




Begin forwarded message:

From: Gordon Apple <email@hidden>
Date: March 2, 2007 11:23:50  PST
To: email@hidden
Subject: NSUnionRect

   The list search is dead tonight.

What's with NSUnionRect? I am getting a result of (0,0,0,0) when
evaluating NSUnionRect with (0,600,0,0) and (400,600,0,0). The correct
result should be (0,600,400,0). I was trying to use it to compute the
bounding rect of a polygon. I wrote my own to make it work right.

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References: 
 >NSUnionRect (From: Gordon Apple <email@hidden>)



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