Hi,

From the looks of it you are using legacy code!

For one ConTeXt  uses UTF you no need texansi encoding.

In Mkiv all you need is

\startext
  \startMPpage
     fill fullcircle scaled 2cm withcolor red;
     label(\sometxt{Cn},origin) withcolor white;
  \stopMPpage
\stoptext

If you want to set font use \definefontfamily and \setbodyfont commands.

regards
	Keith.

Am 28.01.2015 um 05:45 schrieb Van Dung Tang <nguyen969@gmail.com>:
> 
> I edit 1 file metafun follow:
> 
> \startMPenvironment
> \usetypescript[times][texnansi]
> \switchtobodyfont[times,10pt]
> \stopMPenvironment
> \startMPpage
> fill fullcircle scaled 2cm withcolor red;
> label(\sometxt{Cn},origin) withcolor white;
> \stopMPpage
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