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- Path: sparky!uunet!mcsun!sunic!hagbard!loglule!prosys!ath
- From: ath@linkoping.trab.se (Anders Thulin)
- Newsgroups: comp.lang.postscript
- Subject: Re: Text formatters turn PostScript upside down -- why?
- Message-ID: <1992Nov16.072212.3294@linkoping.trab.se>
- Date: 16 Nov 92 07:22:12 GMT
- References: <1992Nov14.222532.8727@cs.brown.edu>
- Organization: Telia Research AB, Teknikringen 2B, S-583 30 Linkoping, Sweden
- Lines: 26
-
- In article <1992Nov14.222532.8727@cs.brown.edu> jgm@cs.brown.edu (Jonathan Monsarrat) writes:
- >Why do text formatters/converters like dvips (for TeX) and grops (for Troff)
- >define everything upside down in PostScript?
-
- Upside down? In relation to what?
-
- I suspect you're thinking of the different coordinate origins used:
-
- * DVI files have a origin in the upper left corner of the page, Y
- coordinates going down the page.
-
- * PS has a default origin in the lower left corner, Y coordinates going
- up the page.
-
- >Just to be mean?
-
- To be mean to what - a PostScript interpreter?
-
- To keep things simple. DVI coordinate origin cannot be changed, but
- the PS origin and direction of coordinate axes can. So it's simpler to
- remap the PS coordinate system - no need to perform all that tedious
- coordinate conversion if PS can do it 'automatically'.
-
- --
- Anders Thulin ath@linkoping.trab.se 013-23 55 32
- Telia Research AB, Teknikringen 2B, S-583 30 Linkoping, Sweden
-