[metapost] pdftex \pdflastxpos for metapost?

Dan Luecking luecking at uark.edu
Mon May 9 17:19:18 CEST 2005

At 05:02 PM 5/8/2005, you wrote:
>i'm trying to produce a page-size overlay with mpost over a page made by
>pdftex, where the \pdflastxpos and \pdflastypos coordinate pairs from
>certain anchor points are written to some .pos file by pdftex and then
>read in by mpost.
>Problem is that \pdflastx/ypos are integers in sp units, too large for
>mpost to handle. Now how to reduce these integers? Is it possible to do
>this already on the pdftex side during/inside the \write{} by some
>division macro? That would be nice. Or maybe by a slow scaling function
>via scantokens on the mpost side? Currently the easiest seems to
>preprocess the .pos file by awk, which is ugly due to the additional
>step. It looks as if it would be easier if there were some
>\pdflastxcoord and \pdflastycoord as dimen registers.

You could assign the value to a temporary dimension register (in pdftex)
and write that out. Example:

\dimen0=\number\pdflastxpos sp %\dimen0=1\pdflastxpos should also work.

TeX/pdfTeX expands  \the <dimen register>  to the dimension in
points. For example,
   \dimen0=65536 sp "\the\dimen0"


Daniel H. Luecking
Department of Mathematical Sciences
University of Arkansas
"Be kind. Every person you meet is fighting a hard battle." - Anon.

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