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Topic: Re: Question on Tm parameters
Conf: (P-PDF) Developers, Msg: 58329
From: LeonardR
Date: 5/29/2002 05:31 PM

At 3:46 PM -0400 7/23/01, p-pdf-developer Listmanager wrote:
>I have a question about the Tm command. I have looked through the
>pdf spec - I presume these are values e and f) but am unclear from

It's a 2 x 3 matrix - [ a b c d e f ], where a & d are
scaling factors, e & f are translation factors and b & c are used for
rotation and skew. Again, this is all in the PDFspec...

>How do the second and third parameters in the Tm command (in this
>case 0 0.987 often 0 0) effect the plotting and the calculation of
>the next TD relative move?

They shouldn't make any difference since a TD is akin to
doing a "1 0 0 1 x y", where x & y are the params to TD. So whatever
you are doing with them in general in your text calcs, you'd do with
them here.

>I am calculating the move as 5.6 * 15.5299 which is incorrect. It
>looks like it should be about 10 * 15.5299.
Are you doing simple algebra, or matrix math? You need to do
a full matrix multiply.

Leonard Rosenthol
Director of Software Development (215) 922-3509 (voice)
Appligent, Inc. (aka Digital Applications) (610) 284-4233 (fax)

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