Special thanks to Sreeram, Wolfgang, Bruce, Hraban for help with this
issue, ranging from the simplest 'manual' approach (Bruce) to one that I
must confess I could never have thought of using: definepageinjection
(Wolfgang). Needless to say, all contributions work, with a bit of
adjustment in each case for my particular situation.
The one common factor in all four contributions is the use of setups, so
a light has begun flashing for me: setups are such an important feature
of ConTeXt for solving many problems!
Thanks to all,
Julian
On 7/3/22 18:01, śrīrāma wrote:
On Monday, March 7, 2022 11:50 AM jbf wrote:
All ten images are different, though, in my case (Chapter1.jpg,
Chapter2.jpg... Chapter10.jpg all in a pics directory, so I'd point
\setupexternalfigures to that). I wonder if there is a way to list them
so that they get called in order as chapters proceed. A kind of "if such
and such then \setlayer 1,2,3...."
I think that should be easy. Suppose you have images
{chap-cover-1.jpg, chap-cover-2.jpg, ... chap-cover-10.jpg}
each of which appear at the ends of their respective chapters, then the
following achieves what you want (once you point ConTeXt to the right directory
for figures of course):
% kate: hl ctx
%%% SOF
\setuppagenumbering[alternative=doublesided]
\definelayer
[chapCover]
[x=0mm,
y=0mm,
width=\paperwidth,
height=\paperheight,repeat=yes]
\startsetups chapter:before
\doifoddpageelse{}
{\pushbackground[page]
\resetlayer[chapCover]
\setlayer
[chapCover]
{\determineheadnumber[chapter]
\externalfigure
[chap-cover-\currentheadnumber]
[width=\paperwidth]}
\setupbackgrounds[page][background=chapCover]
\page[empty]
\popbackground}
\stopsetups
\startsetups chapter:after
\doifoddpageelse{}
{\page[empty]}
\stopsetups
\setuphead
[chapter]
[page=yes,
before=\directsetup{chapter:before},
aftersection=\directsetup{chapter:after}]
\starttext
\dorecurse{10}{
\startchapter[title={Chapter \convertnumber{word}{\recurselevel}}]
\input knuth
\ifnum\headnumber[chapter]=5
{\bfd five}
\fi
\blank
\input tufte
\blank
\input ward
\blank
\ifnum\recurselevel=5
\page
\input zapf
\input zapf
\fi
\stopchapter
}
\stoptext
%%% EOF
So we figure out which chapter we are in and then set the layer to the
corresponding picture. Personally, I much prefer to collect all the images into
a separate PDF with:
%%% chap-covers.tex
\starttext
\dorecurse{10}{\startTEXpage
\externalfigure[chap-cover-\recurselevel]
\stopTEXpage}
\stoptext
%%% EOF
[and get 'chap-covers.pdf' from context]
... and then modify the 'before' setup to read as below
%%%
\startsetups chapter:before
\doifoddpageelse{}
{\pushbackground[page]
\resetlayer[chapCover]
\setlayer
[chapCover]
{\determineheadnumber[chapter]
\externalfigure
[chap-covers]
[page=\currentheadnumber,width=\paperwidth]}
\setupbackgrounds[page][background=chapCover]
\page[empty]
\popbackground}
\stopsetups
%%%
Sreeram
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