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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: is there a problem with local definitions in metafun?
Date: Fri, 08 Dec 2000 20:18:07 +0100
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Cc: ntg-context@ntg.nl, roegel@lorraine.loria.fr (Denis B. Roegel)
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At 05:41 PM 12/8/00 +0100, Denis B. Roegel wrote:
>When porting a standard metapost example to context,
>I noticed that there was a problem with local definitions.
>For instance, in my original file, I had
>
>beginfig(1);
>
> ...
> def ...
>
> vardef ...
>
> other code
>endfig;
>end
>
>But I first naively translated this into
>
>\startuseMPgraphic{dummy}
>
> ...
> def ...
>
> vardef ...
>
> other code
>\stopuseMPgraphic
>
>(as it works for an example in the metafun manual)
>
>It didn't work with my example and I had to split the code:
>
>\startMPinclusions
>
> ...
> def ...
>
> vardef ...
>\stopMPinclusions
>
>\startuseMPgraphic{dummy}
> other code
>\stopuseMPgraphic
>
>Is there an explanation for this?

I don't understand this. Everything between start/stop...MPgraphic becomes
a begin/endfig, so local defs should end up there. 

A problem can arise when one graphic defined a macro and another one uses
it, while the graphics are processed independently. 

You can so things like: 

\startuseMPgraphic{common}
  some code
\stopuseMPgraphic

\startuseMPgraphic{aaa}
  \includeMPgraphic{common}
   some more code 
\stopuseMPgraphic

\useMPgraphic{aaa}

Hans

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