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From: russ@dash.mitre.org (Russell Leighton)
Newsgroups: comp.windows.news
Subject: Canvas sizes
Message-ID: <8911071758.AA12039@dash.mitre.org>
Date: 7 Nov 89 23:03:12 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 53

Thanks for your response:


>In xnews, `readcanvas' scales the images to the unit square.
>Given this how do I find out what the actual size of
>the canvas is? I cannot use `getcanvasshape pathbbox'
>because it will return 0 0 1 1.

Do the following (assume can is the result of readcanvas):

	gsave
	can setcanvas
	1 1 dtransform
	abs exch abs
	grestore

The result will be the width and height of the canvas.  Note that I used the
undocumented (at least in the pre-FCS documentation) function 'abs' in
both numbers although only the height will be negative.  This is because
I don't know if NeWS 3.0 will have its internal origin in the upper
right hand corner, due to some X.12 requirements. {:-)

					Rafael Bracho
					rxb@asc.slb.com


This is another response I got:


Try something like this:

readcanvas  % c
dup         % c c
setcanvas   % c
initclip 
clippath 
pathbbox    % c x y w h

This works under 1.1, but not under xnews. In fact, it causes a horrible
crash under a beta version of xnews. Instead, use the new call, getbbox:

readcanvas dup % c c
false getbbox  % c x y w h


	John Martin
	Philips Labs
	jcm@philabs.philips.com
	tel (914) 945-6406



Russ.