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
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