Re: [NTG-context] Screen background in two columns

[Hans Hagen]

At 01:25 PM 2/7/2003 +0100, Michal Kvasnicka wrote:

Good afternoon.

I'm typesetting a document in two columns. I'd like to typeset examples in it
just in the rest of the text but with a screen background. I tried this:

\setupcolors[state=start]
\setupscreens[screen=0.8]
\setupbackground
  [background=screen,
   leftoffset=1em, rightoffset=1em, topoffset=1em, bottomoffset=1em]
\setupframedtexts
  [frame=off, background=screen, width=fit]

But both \startbackground and \startframedtext does not allow column/page
break. I want the background to start e.g. on the bottom of  the left column
and to go to the top of the right one. How can I get what I want? (Well,
maybe a hard task in the TeX. Some time ago I would suppose it to be
unpossible---but then I've seen such a wizardry in the ConTeXt that made me
to think that everything is possible---at least for Mr. Hagen.) :-)

I admit that this takes some wizardry to implement, especially if you take into account that backgrounds should work in tables, tabulate, floats, inside and outside text areas, obey indentation, left/rightskip, hanging, nested backgrounds, multiple layers, etc ; this (still somewhat experimental mechanism will be discussed in details.pdf).

% output=pdftex

\setuplayout
[width=middle,height=middle,
backspace=1cm,topspace=1cm,
header=0pt,footer=0pt,grid=yes]

\setuptolerance[verytolerant,stretch]

\setupindenting[big]

\starttext

\definecolumnset[two][n=3]

\definecolumnsetspan[test]

\definetextbackground[test]
[location=paragraph, % text
background=color,
backgroundcolor=red]

\startcolumnset[two]

\startcolumnsetspan[test]
\input tufte
\stopcolumnsetspan

\starttextbackground[test]
\dorecurse{10}{\input tufte \par}
\stoptextbackground

\stopcolumnset

\stoptext

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Hans Hagen | PRAGMA ADE | [EMAIL PROTECTED]
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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