I think this is one way:

\startuseMPgraphic{ARule}
 draw origin -- (\MPvar{mylength},0) ;
\stopuseMPgraphic

\def\ARule#1{%
\setupMPvariables[ARule][mylength=#1]
\useMPgraphic{ARule}
}

\starttext
Foo \ARule{5mm} bar \ARule{10mm}
\stoptext

Best regards, Mikael

On Thu, Apr 9, 2009 at 8:07 AM, Wei-Wei Guo <wwgu...@gmail.com> wrote:
> Dear all,
>
> I need to use many rules with different lengths. Is there any way to
> implement
> function like below:
>
>  \startuniqueMPgraphic{ARule}{length}
>  draw origin -- (\MPvar{length},0) ;
>  \stopuniqueMPgraphic
>
>  \uniqueMPgraphic[length=5mm]{ARule}
>
> The example cannot be run. I only use it to explain what I want.
>
> Any suggestion is appreciated.
>
> Best wishes,
> Wei-Wei
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