Re: Imageable Region

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#7412

From: Geoffrey Cooper
Date: Thu, 11 Aug 1988 21:48

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The following PostScript procedure returns the printer's resolution in
DPI X & Y on the stack:

/DetermineResolution
{
    gsave
	initmatrix	% force current matrix to default matrix.
	72 0 dtransform dup mul exch dup mul add sqrt % x resolution
	0 72 dtransform dup mul exch dup mul add sqrt % y resolution
    grestore
}
bind def

The procedure works by putting inch vectors parallel to the axes
through the default transformation and measuring the magnitude of the
resultant vectors.  Since the transformation might entail a rotation,
the measurement uses pythagorus' theorem to compute the magnitude.

- Geof
-- 
UUCP: {decwrl,sun}!imagen!geof ARPA: imagen!geof@decwrl.dec.com

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!amdcad!sun!imagen!geof
From: geof@imagen.UUCP (Geoffrey Cooper)
Newsgroups: comp.lang.postscript
Subject: Re: Imageable Region
Summary: Procedure to determine printer resolution.
Keywords: They're all different.
Message-ID: <1782@imagen.UUCP>
Date: 11 Aug 88 21:48:10 GMT
References: <7761@dcatla.UUCP> <5804@pogo.GPID.TEK.COM>
Organization: IMAGEN Corporation, Santa Clara, CA 95052-8101
Lines: 20

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