Re: Empty rect contributes to bounding box

• Subject: Re: Empty rect contributes to bounding box
• From: Bryan Pietrzak <email@hidden>
• Date: Tue, 30 Nov 2004 15:38:17 -0600
• Delivered-to: email@hidden
• Delivered-to: email@hidden

I was calculating a bounding box and thought I would initialize the box to zero.
However, this gives the wrong result!

HIRect hiRect1 = {{0.0}};
HIRect hiRect2 = {{1.0}};

hiRect1 = CGRectUnion( hiRect1, hiRect2 );


// Now hiRect1 = {{0.0,0.0},{2.0,2.0}} !

So one has to write

if ( !<x-tad-bigger>CGRectIsEmpty</x-tad-bigger>(hiRect1)) hiRect1 = CGRectUnion( hiRect1, hiRect2 );
else hiRect1 = hiRect2;

OTOH this means you can calculate the bounding box of a number of points with CGRectUnion!

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