[NTG-context] Combining modes and MetaFun

[Hans Hagen]

On 9/4/2020 2:20 PM, Jan Willem Flamma wrote:
> Dear list members,
> 
> Is it possible to combine modes and MetaFun?
> 
> In the below MWE, the \doifmode construction does not work.
> 
> Kind regards,
> 
> Jan Willem Flamma
> 
> ===
> 
> \enablemode[en]
> 
> %\enablemode[nl]
> 
> \starttext
> 
> \startbuffer[square]
> 
>      u := 2cm ;
> 
>      draw unitsquare scaled u ;
> 
>      drawdblarrow (0,-0.2u)..(u,-0.2u) ;
> 
>      drawdblarrow (1.2u, 0)..(1.2u, u) ;
> 
>      %\doifmode{en}{label(\sometxt{length},  (0.5u,-0.4u)) ;}
> 
>      %\doifmode{nl}{label(\sometxt{lengte},  (0.5u,-0.4u)) ;}
> 
>      %\doifmode{en}{label(\sometxt{width},   (1.6u, 0.5u)) ;}
> 
>      %\doifmode{nl}{label(\sometxt{breedte}, (1.6u, 0.5u)) ;}
> 
> \stopbuffer
> 
> \placefigure
> 
>      [here,none][]{}
> 
>      {\scale[width=0.5\textwidth]{\processMPbuffer[square]}}
> 
> \stoptext
You need to compensate these solutions by "wikifying" them:

\starttext

\startuseMPgraphic{whatever}{s::mode}
     u := 2cm ;
     draw unitsquare scaled u ;
     drawdblarrow (0,-0.2u)..(u,-0.2u) ;
     drawdblarrow (1.2u, 0)..(1.2u, u) ;
     if "\MPvar{mode}" = "en" :
         label("e", (0.5u,-0.4u)) ;
         label("n", (1.6u, 0.5u)) ;
     else :
         label("n", (0.5u,-0.4u)) ;
         label("l", (1.6u, 0.5u)) ;
     fi ;
\stopuseMPgraphic

\useMPgraphic{whatever}{mode=en} \blank
\useMPgraphic{whatever}{mode=nl} \blank

\startuseMPgraphic{whatever}
     u := 2cm ;
     draw unitsquare scaled u ;
     drawdblarrow (0,-0.2u)..(u,-0.2u) ;
     drawdblarrow (1.2u, 0)..(1.2u, u) ;
     if texmode("en") :
         label("e", (0.5u,-0.4u)) ;
         label("n", (1.6u, 0.5u)) ;
     else :
         label("n", (0.5u,-0.4u)) ;
         label("l", (1.6u, 0.5u)) ;
     fi ;
\stopuseMPgraphic

{ \enablemode[en] \useMPgraphic{whatever} } \blank
{                 \useMPgraphic{whatever} } \blank

\stoptext



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                                           Hans Hagen | PRAGMA ADE
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