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Path: utzoo!watmath!clyde!bonnie!akgua!gatech!seismo!harvard!h-sc1!breuel
From: breuel@h-sc1.UUCP (thomas breuel)
Newsgroups: net.micro.mac
Subject: Re: Grow Regions
Message-ID: <814@h-sc1.UUCP>
Date: Fri, 6-Dec-85 12:49:02 EST
Article-I.D.: h-sc1.814
Posted: Fri Dec  6 12:49:02 1985
Date-Received: Mon, 9-Dec-85 03:13:21 EST
References: <8512060411.AA13585@kim>
Organization: Harvard Univ. Science Center
Lines: 12

>     Attention, Real Hackers.  Here's a tough one for you: When the mouse is
> held down in the Grow box of a window and dragged, a gray outline of
> the window follows it around. [...] Now, this
> has got to be a non-trivial operation, saving the bits under the outline,
> writing the outline, then restoring the saved bits after the outline moves.
> Do we mortals have access to some semi-highlevel routine which does this for
> us?  Or am I going to have to kludge something up?  Many thanks in advance.

It looks to me as if the outline is just drawn in XOR mode, which means
that re-drawing it makes it disappear. No saving of bits is necessary.

						Thomas.