Re: TeX trigger in MP macro

[Hans Hagen <pragma@wxs.nl>]

Peter Rolf wrote:
> Hi all,
>
> Currently I am using
>
> \startuniqueMPgraphic{foo}
>   ...
>   if (\DbgFill=0) :
>     fill whatever
>   fi
>   ...
> \stopuniqueMPgraphic
>
> in my MP graphics. \DbgFill (0|1) is just a trigger, which prevents
> filling in case of visual debugging. Instead of always writing this
> 'long' form, it should be possible to use a self written mp-macro
> instead. But my naive approach
>
> def dbg_fill (expr p) =
>   if (\DbgFill=0) :
>     fill p ;
>   fi
> enddef ;
>
> doesn't work. I get
>
>   
>>> DbgFill
>>>       
> ! Unknown relation will be considered false.
>
>
> How do I realize this trigger inside pure MP code and set it outside in
> TeX? The trigger should be global and can change during runtime. Any
> help is welcome.
>   
can you make a test file? 

Hans 

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