[metapost] problem with negative's angle ?

[Christophe Poulain]

Hi,
I'm a french user of Metapost and i've discovered this problem.

%>------------------------
prologues:=2;

beginfig(1);
  path cc;
  cc=fullcircle scaled 3cm;
  draw cc;
  for i=0 upto 11:
    label(decimal(i),point(arctime(((90-i*30)/360)*arclength cc) of cc) of
cc);
    endfor;
endfig;

end
%>--------------------------

There isn't number if "the angle" is negative.

However, if I compile the code below, there is no problem.

%>----------------------
prologues:=2;

beginfig(1);
  path cc;
  cc=fullcircle scaled 3cm;
  draw cc;
  for i=0 upto 11:
    label(decimal(12-i),point(arctime(((90+i*30)/360)*arclength cc) of cc)
of cc);
    endfor;
endfig;

end
%>-----------------------

I don't understand my mistake...

Christophe
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