From:	Edward Hill <edward_hill AT www DOT anything DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Tutorial?
Date:	Fri, 12 Mar 1999 12:14:20 -0800
Organization:	Easams Engineering Systems
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To:	djgpp AT delorie DOT com
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John G wrote:
: 
: Hello all,
: 
: Could someone point me to a good tutorial on implementing dirty
: rectangles.  I have been trying to think about this, and the only way
: I could think to do it is to have a tons of conditionals at each place
: where something is draw to the buffer to check for which rectangle
: should be set to dirty by testing ranges for x1, rect.x1, x2 and so
: on).  Is this really what you have to do.  I would think it would
: actually slow down the program not speed it up.


www.perplexed.com/GPMega/

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