Am 07.05.2013 um 22:28 schrieb Roland Thiers <roland.thi...@gmail.com>:
> Thank you very much for this precision, Wolfgang. I tried with two variables
> and it works with this
> syntax :
>
> \startuniqueMPgraphic{polygoneregulier}
> numeric u ; u:=\MPvar{unite}*cm ;
> numeric n ; n:=\MPvar{sides};
> rest of the code
> \stopuniqueMPgraphic
>
> \define[2]\polyreg
> {\setupMPvariables[polygoneregulier][unite,sides]
> \uniqueMPgraphic{polygoneregulier}{sides=#1,unite=#2}}
You can define the command as
\define[2]\polyreg
{\setupMPvariables[polygoneregular][sides=#1,unite=#2]%
\uniqueMPgraphic{polygoneregular}}
where the variables are set with the \settupMPvariables command or as
\define[2]\polyreg
{\uniqueMPgraphic{polygoneregular}{sides=#1,unite=#2}}
where the variables are set in the optional argument for \uniqueMPgraphic.
> \starttext
> %\uniqueMPgraphic{polygoneregulier}{unite=2,sides=4}
> \polyreg{6}{0.5}
> \stoptext
>
> I did not find any détails on \MPvar et \setupMPvariables on the wiki, however
Both commands are mentioned in the metafun [1] manual.
[1] http://www.pragma-ade.nl/show-man-7.htm
Wolfgang
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