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 <fabrice1.couvreur@gmail.com>
> 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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