Hans,

Thanks a lot. I'm still trying to apply this to the top/bottom; I suppose
it should be simple after I have a firmer grasp of language.

lør. 1. jan. 2022 kl. 10:15 skrev Hans Hagen <j.hagen@xs4all.nl>:

> On 1/1/2022 11:46 AM, Youssef Cherem via ntg-context wrote:
> > Dear list users,
> >
> > How can one go about implementing a ruler around the page/text area
> > (such as a background) like the one provided by the latex package
> > fgruler? https://www.ctan.org/tex-archive/macros/latex/contrib/fgruler
> > <https://www.ctan.org/tex-archive/macros/latex/contrib/fgruler> or koma
> > script's \layercontentsmeasure?
> a good opportunity to learn some metapost
>
> \startuniqueMPpagegraphic{ruler}
>      numeric n, f, sign ;
>      pair first, last;
>      if OnOddPage :
>          first := urcorner Page;
>          last  := lrcorner Page;
>          sign  := -1;
>      else :
>          first := ulcorner Page;
>          last  := llcorner Page;
>          sign  := 1;
>      fi ;
>      f := xpart first;
>      n := 0;
>      draw first -- last withpen pencircle scaled 2pt;
>      for i = ypart first step -1mm until ypart last :
>          if (n mod 10) == 0 :
>              draw (f,i) -- (f+sign*10mm,i) ;
>              if OnOddPage :
>                  draw thetextext.lft(n/10,(f+sign*12mm,i)) ;
>              else :
>                  draw thetextext.rt (n/10,(f+sign*12mm,i)) ;
>              fi
>          elseif (n mod 5) == 0 :
>              draw (f,i) -- (f+sign*5mm,i) ;
>          else :
>              draw (f,i) -- (f+sign*3mm,i) ;
>          fi ;
>          n := n + 1 ;
>      endfor ;
>      setbounds currentpicture to Page ;
> \stopuniqueMPpagegraphic
>
> \defineoverlay[ruler][\uniqueMPpagegraphic{ruler}]
>
> \setupbackgrounds[page][background=ruler]
>
> \setuppagenumbering[alternative=doublesided]
>
> \starttext
>      \dorecurse{10}{test \page}
> \stoptext
>
>
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>