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From: maclab@reed.UUCP (Mac DLab)
Newsgroups: net.micro.mac
Subject: Re: Grow Regions
Message-ID: <2242@reed.UUCP>
Date: Sat, 7-Dec-85 16:09:50 EST
Article-I.D.: reed.2242
Posted: Sat Dec  7 16:09:50 1985
Date-Received: Mon, 9-Dec-85 03:42:12 EST
References: <8512060411.AA13585@kim>
Organization: Reed College, Portland, Oregon
Lines: 17

> Subject: Grow Regions: How do they do that?
> 
>     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.  Likewise, in MacPaint or the Finder, you can 
> use a rectangle, which also appears in blinking gray, to select.  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.
> 
> Steve Upstill

No bits are saved -- the outline is just drawn in penmode patxor:  when
you redraw the same lines, the xor reverses the bits back to normal.

Scott Gillespie