Setting style and color attributes of label in metapost

Setting style and color attributes of label in metapost

[Aditya Mahajan]

I am writing a module which uses metapost in the background for drawing. I 
wanted to create an interface for setting the style and color of metapost 
labels but using \doset...attributes is not working.

Here is an example:

\definenamespace
   [test]
   [style=yes,
    name=test,
    command=yes,
    setup=yes]

\definetest
   [blue]
   [color=blue, text=Blue]

\definetest
   [two]
   [blue]
   [style=\bold, text=Two]

\starttext
\edef\currenttest{two}
\startMPdrawing
   label.lft(\sometxt{\dosettestattributes{style}{color}
   \testparameter{text}}, (0,0)) ;
\stopMPdrawing

\edef\currenttest{blue}
\startMPdrawing
   label.lft(\sometxt{\dosettestattributes{color}{style}
   \testparameter{text}}, (2cm,0)) ;
\stopMPdrawing
\MPdrawingdonetrue\getMPdrawing
\stoptext

Notice that the first label has the same style as the last label. This is 
happening because \doset..attributes is defined as an unexpandable macro. 
I can get around this by setting the value of \currenttest inside the 
\sometxt{...} argument. Something like:

\def\dosometxt#1#2%
     {\normaldosometxt{#1}%
       {\def\noexpand\letterbackslash currenttest{\currenttest #2}}}


Surely, there should be a more direct way of achieving this?

Aditya
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Re: Setting style and color attributes of label in metapost

[Wolfgang Schuster]

Am 25.09.2011 um 02:43 schrieb Aditya Mahajan:

> I am writing a module which uses metapost in the background for drawing. I wanted to create an interface for setting the style and color of metapost labels but using \doset...attributes is not working.
> 
> Here is an example:
> 
> \definenamespace
>  [test]
>  [style=yes,
>   name=test,
>   command=yes,
>   setup=yes]
> 
> \definetest
>  [blue]
>  [color=blue, text=Blue]
> 
> \definetest
>  [two]
>  [blue]
>  [style=\bold, text=Two]
> 
> \starttext
> \edef\currenttest{two}
> \startMPdrawing
>  label.lft(\sometxt{\dosettestattributes{style}{color}
>  \testparameter{text}}, (0,0)) ;

You can use the old \doattributes command which is expandable.

label.lft(\sometxt{\doattributes{\currenttesthash}{style}{color}{\testparameter{text}}},(0,0)) ;

Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________