[NTG-context] \setupMPvariables in \startMPpage

Hans Hagen pragma at wxs.nl
Tue Dec 27 21:58:55 CET 2005

David Arnold wrote:

> Why doesn't this work?
> %output=pdf
> \startuseMPgraphic{usquare}
>   draw unitsquare scaled \MPvar{u};
> \stopuseMPgraphic
> \starttext
> \startMPpage
> \setupMPvariables[usquare][u=4cm]
> \includeMPgraphic{usquare}
> \stopMPpage
> \stoptext


(1) after startMPpage metapost code is expected (or something like 
\includeMPgraphic{...} that expands to mp code
(2) when the setup is moved outside the startMPpage, contex does not 
know what vars to preset

however, this works (MPrawvar is undocumented, yet)

  draw unitsquare scaled \MPrawvar{usquare}{u};





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