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From: mark@mimsy.UUCP
Newsgroups: comp.graphics
Subject: Re: Bounding boxes and drawing dashed vectors in SunView
Message-ID: <5589@mimsy.UUCP>
Date: Wed, 25-Feb-87 14:25:21 EST
Article-I.D.: mimsy.5589
Posted: Wed Feb 25 14:25:21 1987
Date-Received: Fri, 27-Feb-87 23:27:44 EST
References: <2601@phri.UUCP>
Reply-To: mark@mimsy.UUCP (Mark Weiser)
Organization: PRISM Group, University of Maryland, College Park, MD 20742
Lines: 23

In article <2601@phri.UUCP> roy@phri.UUCP (Roy Smith) writes:
>
>	I have two questions about the SunView pixrect package.
>
>	First, is there an easy way to find the bounding box of a memory
>pixrect? ...The only way I can see to find the bounding box is by brute force
>raster scanning of the pixrect using pr_get(), but this is bound to be
>slow.  Is there a faster way?

If you are using pr_load then you have got memory pixrect, and their
representation in memory is guaranteed and documented (in the Pixrect
Reference guide).  You can essentially deal with the pixels as an array
of shorts, which is much faster than using pr_get().

>
>	My second question concerns drawing dashed vectors.  >

SunOS 3.2 has a dashed (and other shaped) vector primitive that was not
there in previous versions.
-mark
-- 
Spoken: Mark Weiser 	ARPA:	mark@mimsy.umd.edu	Phone: +1-301-454-7817
After May 1, 1987: weiser@xerox.com