Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site 3comvax.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!petrus!bellcore!decvax!decwrl!glacier!oliveb!3comvax!mykes
From: mykes@3comvax.UUCP (Mike Schwartz)
Newsgroups: net.micro.amiga
Subject: Re: Re: interlace mode
Message-ID: <388@3comvax.UUCP>
Date: Tue, 28-Jan-86 12:48:31 EST
Article-I.D.: 3comvax.388
Posted: Tue Jan 28 12:48:31 1986
Date-Received: Sat, 1-Feb-86 01:59:11 EST
References: <570@amiga.amiga.UUCP> <877@h-sc1.UUCP> <511@well.UUCP> <633@edison.UUCP>
Reply-To: mykes@3comvax.UUCP (Mike Schwartz)
Organization: 3Com Corp; Mountain View, CA
Lines: 24


In 640 x 400 mode, plotting pixels 2-tall yields 399 vertical positions.
Consider the following illustration:


 line1 | x
 line2 | x  x
 line3 |    x  x
 line4 |       x

 This illustrates positioning 3 2-tall pixels at different vertical positions.

 In order for there to be only 200 vertical positions, the pixels would be
 plotted like this:

 line1 | x
 line2 | x
 line3 |   x
 line4 |   x
 line5 |     x
 line6 |     x

 In other words, in interlaced mode, plot the pixel at the point you
 would normally plot, plus the point below (or above) it.