Re: Create an item marker with a counter with Metapost

[Aditya Mahajan <adityam@umich.edu>]

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On Mon, 10 Nov 2014, Wolfgang Schuster wrote:

>
>> Am 10.11.2014 um 19:18 schrieb Fabrice Couvreur <fabrice1.couvreur@gmail.com>:
>>
>> Hi,
>> With the book Metafun I created a marker with metapost. How to add a counter ?
>> Best regards,
>> Fabrice
>>
>> \startuseMPgraphic{itemize:fuzzy}
>> numeric u;
>> u:=0.5cm;
>> save p; path p;
>> p := fullcircle xyscaled (u,u) randomized 2pt;
>> pickup pencircle scaled 1pt;
>> fill p withcolor green;
>> draw p withcolor blue;
>> \stopuseMPgraphic
>> \definesymbol[itemize:fuzzy][\useMPgraphic{itemize:fuzzy}]
>> \setupitemize[1][symbol=itemize:fuzzy]
>> \starttext
>> \startitemize
>> \item \input knuth
>> \item \input knuth
>> \stopitemize
>> \stoptext
>
> You can use the visualcounter module, the documentation is included in the package
> or you download it from the github [1] page.
>
> [1] https://github.com/adityam/visualcounter <https://github.com/adityam/visualcounter>

Complete example attached. You can easily make the fill color and draw 
color to be configurable by a key-value interface.

The counter corresponding to itemgroups is called 
\v_strc_itemgroups_counter.

Aditya

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\usemodule[visualcounter]

\unprotect
\definevisualcounter
  [randomcircle]
  [
    mp=visualcounter::randomcircle,
    rulethickness=1pt,
  ]

\startuseMPgraphic{visualcounter::randomcircle}
  begingroup;

  \includeMPgraphic{visualcounter::initialization}

  if (last_counter > 0) and (current_counter > 0) :
    newpicture countertext     ; countertext     := textext("\visualcounterparameter\c!text");
    newpicture max_countertext ; max_countertext := textext("\visualcounterparameter{\c!max\c!text}");

    newnumeric diameter;
    diameter := 1.75 * max(bbwidth(max_countertext), bbheight(max_countertext)); 
    
    newpath randomcircle; 
    randomcircle := fullcircle xyscaled(diameter, diameter) randomized (diameter/20);

    pickup pencircle scaled \visualcounterparameter\c!rulethickness ;
    fill randomcircle withcolor green; % Can be made configurable
    draw randomcircle withcolor blue;  % Can be made configurable

    label (countertext, origin);


  fi;
  endgroup;
\stopuseMPgraphic
\protect

\definevisualcounter
  [fuzzyitem]
  [randomcircle]
  [counter=\getvalue{v_strc_itemgroups_counter}]

\definesymbol[fuzzy][{\framed[location=depth, frame=off, strut=no]{\usevisualcounter{fuzzyitem}}}]

\starttext
\startitemize[fuzzy]
\startitem \input knuth \stopitem
\startitem \input knuth \stopitem
\stopitemize
\stoptext


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