Indeed a challenge!
Alan
On Tue, 10 Sep 2013 18:11:13 +0200
Hans Hagen <pra...@wxs.nl> wrote:
> Hi,
>
> There's now a convenient way to pass data back from an mprun to the
> tex instance:
>
> \starttext
>
> \startMPcode
> passvariable("version","1.0") ;
> passvariable("number",123) ;
> passvariable("string","whatever") ;
> passvariable("point",(1,2)) ;
> passvariable("triplet",(1,2,3)) ;
> passvariable("quad",(1,2,3,4)) ;
> passvariable("boolean",false) ;
> passvariable("path",fullcircle scaled 1cm) ;
>
> draw fullcircle scaled 20pt ;
> \stopMPcode
>
> \ctxlua{inspect(metapost.variables)}
>
> \ctxcommand{mprunvar("number")}
> \ctxcommand{mprunvar("string")}
>
> \stoptext
>
> the inspect shows:
>
> table={
> ["boolean"]=false,
> ["number"]=123,
> ["path"]={
> { 10.02177, 10.02177, 12.67969, 7.36386, 7.36386, 12.67969 },
> { 0, 14.17323, 3.75914, 14.17323, -3.75914, 14.17323 },
> { -10.02177, 10.02177, -7.36386, 12.67969, -12.67969, 7.36386 },
> { -14.17323, 0, -14.17323, 3.75914, -14.17323, -3.75914 },
> { -10.02177, -10.02177, -12.67969, -7.36386, -7.36386, -12.67969 },
> { 0, -14.17323, -3.75914, -14.17323, 3.75914, -14.17323 },
> { 10.02177, -10.02177, 7.36386, -12.67969, 12.67969, -7.36386 },
> { 14.17323, 0, 14.17323, -3.75914, 14.17323, 3.75914 },
> },
> ["point"]={ 1, 2 },
> ["quad"]={ 1, 2, 3, 4 },
> ["string"]="whatever",
> ["triplet"]={ 1, 2, 3 },
> ["version"]="1.0",
> }
>
> the mprunvar pips a value or concatination to tex
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