Xref: utzoo comp.graphics:9969 comp.lang.postscript:4159
Path: utzoo!utgpu!watserv1!watmath!att!dptg!lzga!jlw
From: jlw@lzga.ATT.COM (Joe Wood)
Newsgroups: comp.graphics,comp.lang.postscript
Subject: Re: Transpose Question
Keywords: rotate Page translate 0 -617
Message-ID: <1823@lzga.ATT.COM>
Date: 15 Feb 90 14:01:28 GMT
References: <1990Jan30.213715.25270@Neon.Stanford.EDU> <1990Jan31.010050.16064@deimos.cis.ksu.edu> <10519@microsoft.UUCP> <1990Feb14.174304.26351@eagle.lerc.nasa.gov>
Reply-To: jlw@lzga.UUCP (Joe Wood)
Organization: AT&T BL Middletown/Lincroft NJ USA
Lines: 27

In article <1990Feb14.174304.26351@eagle.lerc.nasa.gov> fsfacca@avelon.UUCP (Tony Facca) writes:
>In article <10519@microsoft.UUCP> t-dougls@microsoft.UUCP (Douglas Strauss) writes:
>>I have just started to muck around with some postscript and wondering
>>how the values of the transpose function are intpreted.  On the apple
>>laserwriter I am using:
>>90 rotate
>>0 -617 translate


In simpler terms think of it this way.  Take two 8.5"x11" sheets
of paper one on top of the other with the long edge up and down.
Think of drawing you image on the top sheet with the origin in the
lower left hand corner and the X direction increasing to the right
and the Y direction increasing upward.  Grab both sheets by the
thumb and forefinger of the left hand at the lower left corner
of the two sheets.  Now turn the top sheet only 90 degrees to
the left (counter-clockwise).  The printing surface is still
where the lower unmoved sheet is.  Therefore, to move the
image back onto the paper you must shift it to the right about
the width of a sheet of paper in PostScript units ~8.5"x72= ~617.
Since you rotated your frame of reference this is now in the
negative Y direction and <NOT> in the X direction.  After all this
you're ready to draw in what is essentially LandScape mode.

Hope this helps.
Joe Wood
jlw@lzga.ATT.COM