[NTG-context] Centering the page

[Wolfgang Schuster]

On Thu, Nov 27, 2008 at 1:46 PM, Mohamed Bana
<mbana.lists at googlemail.com> wrote:
> Thanks, but that's not what I had in mind.  Look at the right edge of
> the pdf (http://filebin.ca/rzjruz/test.pdf or http://filebin.ca/rzjruz)
> there's a gap - about 1/2 a centimetres - which isn't on the left side.
>  It doesn't look uniform.

The left and right margina re different but they have nothing to do
with the distance of the text block from the left and right margin
of the paper.

\setuplayout
  [width=middle,
   leftmargin=2cm,
   rightmargin=2cm]

\showframe

\starttext
Hello world!
\stoptext

Wolfgang