new ConTeXt and metapost

["Haseloff, Lutz" <Lutz.Haseloff@mdf.brandenburg.de>]

Hi Hans, Hi all,

the new ConTeXt (2000.01.26) writes mpgraph.mp with error.
mp breaks with:

>> _data_prefix_
>> "mpd-"
! Equation cannot be performed (numeric=string).
<to be read again>
                   ;
l.5 _data_prefix_ := "mpd-" ;

the same goes for : _data_suffix_ := ".tmp" ;

My input file is:

\startuseMPgraphic{Fig 1}
linejoin:=mitered;
for i = 0 upto 4:
z[i]=(7cm*sind(i*360/5),7cm*cosd(i*360/5));
endfor;
draw z0--z1--z2--z3--z4--cycle;
draw z0..z1..z2..z3..z4..cycle;
pickup pencircle scaled 1.5pt;
draw z2--z3--(x3,y0)--(x2,y0)--cycle;
\stopuseMPgraphic
\starttext
\useMPgraphic{Fig 1}
\stoptext

Greetings

Lutz