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From: mdf@osu-eddie.UUCP (Mark D. Freeman)
Newsgroups: net.info-terms
Subject: Re: Wyse "magic cookies"
Message-ID: <1284@osu-eddie.UUCP>
Date: Thu, 6-Feb-86 18:10:46 EST
Article-I.D.: osu-eddi.1284
Posted: Thu Feb  6 18:10:46 1986
Date-Received: Sun, 9-Feb-86 04:52:18 EST
References: <312@uw-june> <120@ucdavis.UUCP> <1374@sdcsvax.UUCP> <3039@umcp-cs.UUCP>
Reply-To: mdf@osu-eddie.UUCP (Mark D. Freeman)
Organization: StrongPoint Systems, Inc. (guest of Ohio State U.)
Lines: 38

Summary:

>In article <1374@sdcsvax.UUCP> jc@sdcsvax.UUCP writes:
> Video attributes remain effective until another such character is
> encountered.


I had to make a program of mine work on a Televideo 950, so anytime I sent some
text to the screen I figured out the length of the string to be printed, then
figured out where the last character would appear when it was sent to the
screen.  Then I sent it this way:

Position cursor to column after where text ends, print <end-attribute>.
Position cursor to column before where text stars, print <begin-attribute>.
Print text.

This was the only way to keep the whole screen from changing to underlined text
while I printed one underlined word near the top of the screen.  As soon as the
<begin-underline> got to the screen, everything until the next <end-attribute>,
or the end of the screen if there aren't any, changes to underline.  Then the
text prints, then the <end-attribute> is sent, and everything after the <end-
attribute> that changed to underlining (as a result of the magic cookies),
changes back.  So the net effect is that major portions of the screen FLASH
underlines, inverse, and other things while you are doing screen updates.

Very ugly.  My way of doing things solved the problem, but it involved
rewriting all my screen output code.
-- 
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Mark D. Freeman                     Guest account at The Ohio State University
StrongPoint Systems, Inc.				    mdf@osu-eddie.UUCP
209 Olentangy Street					  Mdf@Ohio-State.CSNET
Columbus, OH  43202-2340		       Mdf%Ohio-State@CSNET-RELAY.ARPA
							 !cbosgd!osu-eddie!mdf
I disclaim even my very existance.

Acceptance without proof is the fundamental characteristic of Western religion,
 Rejection without proof is the fundamental characteristic of Western science.
		-- Gary Zukav from "The Dancing Wu Li Masters"
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