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From: stefan@shiva.systemware.de (Stefan Stapelberg)
Newsgroups: comp.lang.postscript,comp.sources.wanted
Subject: Re: how do I find the real edges of printing on a PostScript printer?
Message-ID: <1473@shiva.systemware.de>
Date: 15 Apr 91 13:32:11 GMT
References: <1014@keele.keele.ac.uk> <111045.29249@timbuk.cray.com> <1991Mar21.190956.21412@starnet.uucp>
Reply-To: stefan@systemware.de (Stefan Stapelberg)
Followup-To: comp.lang.postscript
Organization: MIKROS Systemware, Lohr/Germany
Lines: 29

In article <1991Mar21.190956.21412@starnet.uucp> mzellers@starnet.UUCP (Mark Zellers) writes:
>If you want to find the boundaries of the imageable area (rather than
>the paper)  try using 
>
>	clippath pathbbox
>
>to get the llx lly urx ury of the current clipping path (which is by
>default the imageable area).

My troff->postscript converter produces the following code to compensate
for the lower boundary of the imageable area (lly) and to set a variable
`pgtop' (top of page), which will be used (in procedure `Y') to compute
the absolute vertical position from a given distance to the TOP.

	clippath pathbbox pop pop exch pop 0 exch translate
	clippath pathbbox /pgtop exch def pop pop pop
	/Y { pgtop exch sub currentpoint pop exch moveto } bind def

IMHO this violates the rules of page independence, since the boundaries
of the imageable area don't change if this output is scaled down and
included within another document. Is this correct?

I am also curious what the response for 'clippath pathbbox' would be on a
Linotronic. Does the Lino return the physical dimensions of the imageable
area or the values which may have been previously set with 'setpageparams'?

Thanks in advance for any hints.
__
Stefan Stapelberg,	<stefan@systemware.de>