Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!sunybcs!boulder!tramp!ewing
From: ewing@tramp.Colorado.EDU (EWING DAVID JAMES)
Newsgroups: comp.sys.mac.programmer
Subject: Re: lasso effect?
Message-ID: <15276@boulder.Colorado.EDU>
Date: 31 Dec 89 19:32:07 GMT
References: <9423@hoptoad.uucp>
Sender: news@boulder.Colorado.EDU
Reply-To: ewing@tramp.Colorado.EDU (EWING DAVID JAMES)
Organization: University of Colorado, Boulder
Lines: 17

In article <9423@hoptoad.uucp> tim@hoptoad.uucp (Tim Maroney) writes:
>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.

If you have a region you can get the effect by simply calling FrameRgn() with
successive patterns (using PenPat() of course).  If you've created a disjoint
region with CalcMask() and BitMapToRegion(), then this will look just the way
you want it.  There's probably another way to do this using CalcMask and
CopyMask (i.e. without a region), but I can't figure it out right away.

Dave Ewing
ewing@tramp.colorado.edu  (128.138.238.33)
..!hplabs!boulder!onecom!tyvax!iftech!dave (My Mac IIx running uupc & MacOS!)
AppleLink: D2408	  (D2408@applelink.apple.com)