Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hoptoad!tim
From: tim@hoptoad.uucp (Tim Maroney)
Newsgroups: comp.sys.mac.programmer
Subject: lasso effect?
Message-ID: <9423@hoptoad.uucp>
Date: 28 Dec 89 22:55:42 GMT
Organization: Eclectic Software, San Francisco
Lines: 20

I'm using a C version of David Berry's marquee selection code on some
MacPaint documents (thanks, dwb!)  It works very well.  Now how do I do
a lasso effect?  I don't mean the tracking and region computation.  I
mean the weird shimmering that MacPaint and HyperCard do once the item
is selected.

I've tried to reverse engineer it with MacsBug, but MP and HC don't
seem to be using traps to do it.  Neither HyperCard nor MacPaint seem
to be calling any relevant traps.  Step Spy mode shows a sort of
diagonal striping that is strangely context sensitive; e.g., it doesn't
happen on solid black regions, but does on "dotted" regions.

Anyone know what's going on here?
-- 
Tim Maroney, Mac Software Consultant, sun!hoptoad!tim, tim@toad.com

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