From: Edward Hill Newsgroups: comp.os.msdos.djgpp Subject: Re: Tutorial? Date: Fri, 12 Mar 1999 12:14:20 -0800 Organization: Easams Engineering Systems Lines: 14 Message-ID: <36E9759C.615F@gec.nospam.com> References: <36e7b231 DOT 25267878 AT news DOT ma DOT ultranet DOT com> NNTP-Posting-Host: pc02372.gmsws.gecm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.01C-GECMMTL (Win95; I; 16bit) To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com 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/