Hi Wolfgang,
Thank you for the code and still as clear explanations.
Fabrice

2016-07-09 12:45 GMT+02:00 Wolfgang Schuster <schuster.wolfgang@gmail.com>:

Fabrice Couvreur

9. Juli 2016 um 12:17

Hi Wolfgang,

In the first example, so I do not need the command  \currentheadnumber  but just do :

\setuphead
   [chapter]
   [command=\HeadTitle,
    headstyle=\ss,
    numbercommand=\Headed]

ConTeXt passes the section number to the argument of the \Headed command.

But in this second example, using the command \determineheadnumber[chapter], the chapter number is always 0

You need \determineheadnumber[...] each time when the value for \currentheadnumber should change.

\setuppagenumbering[location=footer]

\startusableMPgraphic{NumberHead}
      picture r ;
      r := image ( graphictext
        \MPstring{chapter}
        scaled 4pt
        withfillcolor \MPcolor{lightgray}
        withpen pencircle scaled 1pt ; ) ;
      draw r ;
    \stopusableMPgraphic

\defineoverlay[NumberHead][\uniqueMPgraphic{NumberHead}]

\def\processMPheadnumber#1%
  {\setMPtext{chapter}{\bf#1}
   \useMPgraphic{NumberHead}}

\setuphead
   [chapter]
   [command=\HeadTitle,
    headstyle=\ss,
    numbercommand=\processMPheadnumber{\currentheadnumber}]

The following works here.

\startusableMPgraphic{NumberHead}
      picture r ;
      r := image ( graphictext
        "\bf\namedheadnumber{chapter}"
        scaled 4pt
        withfillcolor \MPcolor{lightgray}
        withpen pencircle scaled 1pt ; ) ;
      draw r ;
\stopusableMPgraphic

\def\processMPheadnumber#1%
  {\useMPgraphic{NumberHead}}

\setuphead
   [chapter]
   [command=\HeadTitle,
    headstyle=\ss,
    numbercommand=\processMPheadnumber]

Wolfgang

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