Bug with rule between columns in columnset

Bug with rule between columns in columnset

[Marco]

Hi,

this seems like a bug in the MetaFun or column set code. Printing a
vertical rule between columns fails with

! terminal: >> NOfTextColumns-1
! Improper final value has been replaced by 0.
<to be read again> 

The code also fails, when the column set code is commented out, but
then the NOfTextColumns doesn't make sense any longer. Older betas
work perfectly.

\startuseMPgraphic{verticalline}
  for i=1 upto NOfTextColumns-1 :
    draw (rightboundary TextColumns[i]) shifted (2.5mm,0) shifted -\MPxy\textanchor;
  endfor ;
  setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic

\defineoverlay [verticalline] [\useMPgraphic{verticalline}]
\setupbackgrounds [text] [background=verticalline]
\definecolumnset [example] [n=2]

\starttext
\startcolumnset [example]
  \input knuth
\stopcolumnset
\stoptext


Marco


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Re: Bug with rule between columns in columnset

[Hans Hagen]

On 24-7-2012 12:52, Marco wrote:
> Hi,
>
> this seems like a bug in the MetaFun or column set code. Printing a
> vertical rule between columns fails with
>
> ! terminal: >> NOfTextColumns-1
> ! Improper final value has been replaced by 0.
> <to be read again>
>
> The code also fails, when the column set code is commented out, but
> then the NOfTextColumns doesn't make sense any longer. Older betas
> work perfectly.
>
> \startuseMPgraphic{verticalline}
>    for i=1 upto NOfTextColumns-1 :
>      draw (rightboundary TextColumns[i]) shifted (2.5mm,0) shifted -\MPxy\textanchor;
>    endfor ;
>    setbounds currentpicture to OverlayBox ;
> \stopuseMPgraphic

that (experimental) mechanism has been removed (maybe something else get 
in place, like regions we have already elsewhere)

> \defineoverlay [verticalline] [\useMPgraphic{verticalline}]
> \setupbackgrounds [text] [background=verticalline]
> \definecolumnset [example] [n=2]
>
> \starttext
> \startcolumnset [example]
>    \input knuth
> \stopcolumnset
> \stoptext

I've added two column state variables to mp:

\startuseMPgraphic{verticalline}
     if CurrentColumn < NOfColumns :
         draw rightboundary OverlayBox shifted (2.5mm,0) ;
         setbounds currentpicture to OverlayBox enlarged 2.5mm;
     fi ;
\stopuseMPgraphic

\definecolumnset [example] [n=3,background=verticalline,distance=5mm]

\defineoverlay [verticalline] [\useMPgraphic{verticalline}]

\starttext
\startcolumnset [example]
   \input knuth
   \input knuth
   \input knuth
   \input knuth
\stopcolumnset
\stoptext

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___________________________________________________________________________________

Re: Bug with rule between columns in columnset

[Marco]

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On 2012-07-24 Hans Hagen <pragma@wxs.nl> wrote:

> I've added two column state variables to mp:
> 
> \startuseMPgraphic{verticalline}
>      if CurrentColumn < NOfColumns :
>          draw rightboundary OverlayBox shifted (2.5mm,0) ;
>          setbounds currentpicture to OverlayBox enlarged 2.5mm;
>      fi ;
> \stopuseMPgraphic  

Thanks Hans for this quick solution. I like the new approach, no
fiddling with test backgrounds.

However, the old mechanism did not draw the rule through where the
graphics are inserted. I don't know why, but that was exactly what I
needed. The new mechanism draws a rule regardless of the presence of
a graphic. See the attached examples.

With the dummy pictures it looks quite okay with the line drawn
through. But in the document several graphics already have a frame,
which then visually interferes with the column separator rule.

Is there a way to get the old behaviour?

Marco

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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