Mojca Miklavec wrote:
> Hello,
>
> I would like to \defineconversion and the use that set of symbols
> inside a metapost graphic. But I need to know the number of symbols,
> so that I can define enough "metapost images with symbols" in advance.
> I realise that there might be a problem since conversion can sometimes
> take an arbitrary number (using a command defined elsewhere), but if I
> could have a reasonable guess for conversions defined explicitely,
> that would already help a lot. (As a workaround and/or if there is no
> easy method to figure that out I can still hardcode "25" and wait
> until someone complains that that is not enough to satisfy his/her
> needs.)
>
> Thanks a lot,
> Mojca
>
>
> \startMPextensions
> numeric variant; variant = 1;
> vardef gp_the_symbol(expr n) =
> picture pict;
> % using metapost
> if variant=1:
> pict := image( fill fullcircle scaled 4pt; ); % TODO
> % using TeX, variant = 2
> else: % TODO: limit the number first
> pict := sometxt(n);
> fi;
> pict shifted -center pict
> enddef ;
>
> def gp_point(expr x, y, n) =
> draw (gp_the_symbol(n) scaled 1 shifted (x,y));
> enddef ;
> \stopMPextensions
>
> \starttext
>
> \defineconversion[abc][$\star$,$\bullet$,$\ast$]
>
> \startTeXtexts
> % TODO: 6 is only a guess: I need a better guess (3 in this case)
> \dostepwiserecurse{1}{6}{1}{\TeXtext{\recurselevel}{{\convertnumber{abc}{\recurselevel}}}}
> \stopTeXtexts
>
> \startMPcode
> variant := 1;
> gp_point(1cm,0cm,1);
> gp_point(2cm,0cm,2);
> variant := 2;
> gp_point(1cm,1cm,1);
> gp_point(2cm,1cm,2);
> gp_point(3cm,1cm,3);
> gp_point(4cm,1cm,4);
> gp_point(5cm,1cm,8);
> \stopMPcode
>
> \stoptext
>
\unprotect
\def\doifelseconversionnumber#1#2%
{\doifdefinedelse{\??cv#1#2}}
\protect
\defineconversion[abc][$\star$,$\bullet$,$\ast$]
\defineconversion[def][m,o,j,c,a]
\doloop
{\doifelseconversionnumber{abc}{\recurselevel}
{[abc \recurselevel\space defined]}
{\exitloop}}
\doloop
{\doifelseconversionnumber{def}{\recurselevel}
{[def \recurselevel\space defined]}
{\exitloop}}
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
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