[NTG-context] How to run Typesetting in MetaPost example (MetaFun)?

Peter Rolf indiego at gmx.net
Wed Jan 19 18:12:00 CET 2011


Am 19.01.2011 14:35, schrieb Verhaag, G.C.H.M.:
> Verhaag, G.C.H.M. wrote:
> 
>> Hi,
>>
>> I wanted to try (using ConTeXt minimals MkIV) the example on page 228
>> of the MetaFun manual, dealing with typesetting in MetaPost.
>>
>> The code is given as:
>>
>> \resetMPdrawing
>> \startMPdrawing
>> picture pic[] ;
>> numeric wid[], len[], pos[], n ;
>> wid[0] := len[0] := pos[0] := n := 0 ;
>> \stopMPdrawing
>>
>> \def\whatever#1%
>> {\appendtoks#1\to\MPtoks
>>  \setbox\MPbox=\hbox{\bfd\the\MPtoks}%
>>  \startMPdrawing
>>   n := n + 1 ; len[n] := \the\wd\MPbox ;
>>  \stopMPdrawing
>>  \startMPdrawing[-]
>>   pic[n] := textext("\bfd\setstrut\strut#1") ;
>>   pic[n] := pic[n] shifted - llcorner pic[n] ;
>>  \stopMPdrawing}
>>
>> \handletokens MetaPost is Fun!\with\whatever
>>
>> But is won't run. The following message is generated:
>>
>> \@@toks ->\MPtoks
>>
>> \dodoappendtoks ->\dodoglobal \@@toks
>>                                      \@EAEAEA {\@EA \the \@EA \@@toks
>> \the ...
>> \whatever #1->\appendtoks #1\to \MPtoks
>>                                        \setbox \MPbox =\hbox {\bfd
>> \the \MP...
>> \dodohandletokenstwo *#1->\dododohandletokens {#1}
>>                                                  \dohandletokens
>> <argument> M
>>            etaPost is Fun!
>> \handletokens ...ndletokens {#2}\dohandletokens #1
>>                                                  \end
>> l.96 \handletokens MetaPost is Fun!\with\whatever
>>
>> Anybody any idea?
>>
>> Regards,
>> Gerard Verhaag
>> ___________________________________________________________________________________
>>
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>>
>>
> Hi,
> 
> I'm in need of help to get the example as described in the MetaFun
> manual running, because I want to use text around a path!
> 
> So, I started reading the chapter about 'Typesetting in METAPOST' and
> wanted to try the examples as given in that chapter, but without succes!
> 
> The problem seem to be the MPtoks macro. According to the text in this
> chapter this low level macro (and MPbox and appendtoks) are already
> defined, but are they really?
> 
> The version of context minimals I use at the moment is:
> 
> MTXrun | current version: 2011.01.18 19:34
> 
> Any suggestions are very much welcomed! Thanks in advance!
> 

Hi Gerard,

how about an alternative way to deal with this?

1. draw the text with Inkscape (put text on a path);
   I think there is even a tutorial for this.
2. select the graphic and save it as *.eps
3. use pstoedit to convert it into *.mp

   pstoedit -v -ssp -f "mpost:" foo.eps foo.mp

4. edit/scale the metapost graphic as you like


Best wishes,  Peter


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