Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-ses!hpcuhb!hpindda!tribby
From: tribby@hpindda.HP.COM (David Tribby)
Newsgroups: comp.sys.apple
Subject: Re: RE: 2 more //gs programming questions
Message-ID: <6230039@hpindda.HP.COM>
Date: 5 Jul 89 16:50:37 GMT
References: <8907011229.AA12157@decwrl.dec.com>
Organization: HP Information Networks Group/Cupertino CA
Lines: 16

Dave Lyons explains how to update only the part of a window that needs it...

>           what you want to do is get the bouding box of the VisRegion (try
>GetVisHandle()^^.bBox to get the smallest rectangle that encloses the part of
>the window that needs to be updated.

I tried this over the weekend and was VERY pleased with the speedup! One
problem I had to overcome: the TML Pascal unit for QuickDraw incorrectly
lists GetVisHandle as a PROCEDURE with a parameter, rather than a
FUNCTION that returns the value. Using the original PROCEDURE returned
garbage values. I defined a FUNCTION GetVisHandle2 of the proper type,
bound to the same Tool. Then it worked fine.

--Dave Tribby
                                   - - - - -
        ARPA: tribby%hpda@hplabs.HP.COM   UUCP: hplabs!hpda!tribby