passing arguments to \processMPbuffer

[Jeong Dal <haksan@me.com>]

Dear all,

For \startuseMPgraphic, there is a way to do that (found in metafun book) as following:

\startuseMPgraphic{Labels}{s, t}
numeric u; u:= 1cm;

for i=0 upto 7:
label (textext("$v_{" & decimal (i) & "}$" ), \MPvar{s}[origin,3u*dir(30*i)]) ;
label (textext("$v_{" & decimal (i) & "}$" ), \MPvar{t}[origin,3u*dir(30*i)]) ;
endfor;
\stopuseMPgraphic

\starttext
	\placefigure[][]{}
	{\useMPgraphic{ColoringFace::Labeling}{s=0.8, t=1.3}}
\stoptext

Is there a way to the same job for \processMPbuffer instead of .5 and .7 in buffer?

\startbuffer[Labels]%{s, t}
numeric u; u:= 1cm;
for i=0 upto 7:
label (textext("$v_{" & decimal (i) & "}$" ), .5[origin,3u*dir(30*i)]) ;
label (textext("$v_{" & decimal (i) & "}$" ), .7[origin,3u*dir(30*i)]) ;
endfor;
\stopbuffer

\starttext
	\processMPbuffer[Labels]%% ?{s, t}?
\stoptext

Thank you.

Best regards,

Dalyoung
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