[NTG-context] help with facing page image
jbf
roma83537 at gmail.com
Tue Mar 8 01:52:07 CET 2022
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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