# [NTG-context] xpos.sty

Paul Jones shagreel at gmail.com
Sat Sep 2 04:44:29 CEST 2006

Again, that is exactly what we needed.  Thank you so much.

paul

On 8/29/06, Hans Hagen <pragma at wxs.nl> wrote:
>
> Paul Jones wrote:
> >
> > Thank you again for very timely and great answers to my question
> > yesterday.  I am finding that implementing things in Context is
> > usually easier than I expect.  This is very nice.  Our company decided
> > to switch to context from latex recently.  It seems to have been a
> > very good decision.  Thanks for all the work you do to make context so
> > fun to use.
> >
> > We have one last thing to get translated from latex to context.  David
> > Kastrup wrote a bit of latex for us (included below) that magically
> > writes out the absolute xy position of each paragraph and image to a
> > log file for us.  We pass some extra information to the commands that
> > get put in the log file for us, but in the end we mainly need a way to
> > get the absolute xy coordinates of the bounding boxes for each
> > paragraph, each section title, each image and each image caption.  Is
> > there a way to get this information with context already? Or do I need
> > to get a new module written?
> i dunno about that code but context has support for positions for years
> now, in your case you probably need something
>
> \starttext
>
> \let\CurrentPos\empty
>
> \def\StartPos#1%
>   {\pushmacro\CurrentPos
>    \edef\CurrentPos{mypos:#1}%
>    \dontleavehmode\bpos\CurrentPos
>    \ignorespaces}
>
> \def\StopPos
>   {\removeunwantedspaces
>    \epos\CurrentPos
>    \popmacro\CurrentPos}
>
> \def\BoxPos#1%
>   {\dowithnextbox{\hbox{\hpos{mypos:#1}{\box\nextbox}}}\vbox}
>
> \StartPos{x}\input tufte \StopPos
>
> \StartPos{y}\input zapf \StopPos
>
> \placefigure
>   {}
>   {\BoxPos{q}{\framed[width=3cm,height=4cm]{}}}
>
> \stoptext
>
> in the *.tui/tuo file you can grep for mypos
>
>
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
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