New subject: overlay or layer for chapter head.

2 Apr 2015

      ...
From: John Culleton 
Subject: [NTG-context] overlay or layer for chapter head.
Date: 2 April 2015 1:19:03 AEDT
I am redoing a book for a client. Each chapter
head has a fancy design. I want to reproduce that
fancy page but still have the "\chapter"
statement for running heads, TOC etc.
Is there a way that I can overlay the entire
chapter first page with a graphic, ideally a one
page pdf file.
I have tried workarounds with
\startstandardmakeup,\writetolist,
\definemarking etc. but the whole thing is
getting too complicated. I just want to overlay a
the entire page with a graphic yet have
the real content of the page still available for
TOC, running head, indexing terms etc.
Any suggestions?
-- 
John Culleton
Wexford Press
Hi John,

I did this recently by defining a layer and putting an image in it using \setlayer, in a macro called just before chapters are started:

\definelayer[chapterbackground]
\setupexternalfigures[location=default]

\unexpanded\def\chapterbefore{
    \setlayer[chapterbackground]{%
        \externalfigure[mill.png]
            [width=\paperwidth,height=\paperheight]
    }
    \setupbackgrounds[page]
        [background=chapterbackground]
}

\setuphead[chapter][before=\chapterbefore]

\starttext
\chapter{Knuth}
\dorecurse{5}{
    \input knuth
    \par
}

\chapter{Dawkins}
\input dawkins
\stoptext

No doubt there is a neater/better way to do it than that. In fact I tried to set up the background only once, like this:

\definelayer[chapterbackground]
\setupexternalfigures[location=default]
\setlayer[chapterbackground]{%
    \externalfigure[mill.png]
        [width=\paperwidth,height=\paperheight]
}

\setuphead[chapter]
    [before={
        \setupbackgrounds[page]
            [background=chapterbackground]
    }]

\starttext
\chapter{Knuth}
\dorecurse{5}{
    \input knuth
    \par
}

\chapter{Dawkins}
\input dawkins
\stoptext

But it looks like the layer “forgets” the image each time it is used, and the second chapter does not have the image. I’d be pleased to know the “right way” to do this too ...

Robin

Re: [NTG-context] overlay or layer for chapter head.

Robin.Kirkham＠csiro.au

Otared Kavian

Procházka Lukáš Ing. - Pontex s. r. o.

John Culleton

Wolfgang Schuster

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