Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!sdd.hp.com!elroy.jpl.nasa.gov!decwrl!adobe!heaven!heaven.woodside.ca.us
From: glenn@heaven.woodside.ca.us (Glenn Reid)
Newsgroups: comp.sys.next
Subject: Re: How do you draw lines into the current view for Rubberbanding
Message-ID: <507@heaven.woodside.ca.us>
Date: 18 May 91 19:22:20 GMT
References: <758@rosie.NeXT.COM>
Sender: glenn@heaven.woodside.ca.us
Lines: 20

Peter King writes

> Check out instance drawing.  Here's a little snippet of code that does  
> temporary line drawing in response to a mouse-down method.

[ code omitted ]

> This causes a little bit of flicker (acceptable when rubber-banding).  If you  
> want to avoid the flicker, then you'd need to do double-buffering with  
> off-screen windows and compositing.  I'll leave this as an exercise for the  
> reader.

I'm curious; why isn't instance drawing implemented to avoid flickering in
the manner you suggest?  It seems that this would be a better
implementation, and just as easy, unless I'm missing something.

--
 Glenn Reid				RightBrain Software
 glenn@heaven.woodside.ca.us		NeXT/PostScript developers
 ..{adobe,next}!heaven!glenn		415-326-2974 (NeXTfax 326-2977)