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From: Michal Kvasnicka <quasar@econ.muni.cz>
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Subject: \chapter with \vbox?
Date: Tue, 30 Sep 2003 10:52:15 +0200
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Dear friends.

I want to typeset a document on a grid. Moreover I want to typeset each 
chapter heading on a separate page this way:

\blank[5*line]
... here is motto...
\vfil
... here is the chapter title and chapter number...
\blank[5*line]

I must include it in a \vbox. I tried \vbox to \textheight, but now the 
motto doesn't fit to a grid. How could I do it? Many thanks for your help.

Michal Kvasnicka

P.S. My chapter setting is like this:

\setuphead[chapter]
  [page=,
   style={\ss\bfe\setupinterlinespace[line=\NormalBaselineskip]},
   numberstyle={\ss\bff\setupinterlinespace[line=\NormalBaselineskip]},
   before={\page\setuplayout[footer=0pt]\page[right]},
   after={\page\setuplayout[footer=3\NormalBaselineskip]},
   command=\MyChapterCommand]
\def\MyChapterCommand#1#2{%
  \vbox to \textheight{%
    \setupinterlinespace[line=\NormalBaselineskip]%
    \blank[5*line,force]%
    \startnarrower[left,right]%
      \leavevmode{\rm\tf\em\the\mottotoks}\par
    \stopnarrower
    \vskip0pt plus 1filll
    \hbox to \textwidth{\hss\vbox{\hsize=0.8\textwidth
      \startframedtext
        [width=0.8\textwidth,align={left,broad}, offset=1.5ex,
         background=color, backgroundcolor=black]
    {\setupinterlinespace[line=28pt]\white #2}%
      \stopframedtext}}
    \kern-\baselineskip
    \vbox to 0pt{%
      \vss
      \hbox to \hsize{%
        \hss\bff #1%
    {\setbox0=\hbox{#1}\ifdim\wd0=0pt\else
        \hbox to0pt{.\hss}\hskip0.8\textwidth\strut\hskip2.5mm\fi}%
      }
    }
    \blank[4*line,force]
  }
 \global\mottotoks={}
}

If trying the code, you must either define \ss\bfe and \ss\bff fonts, or 
remove them.