Jan U. Hasecke schrieb am 29.05.2020 um 15:10:
Am 29.05.20 um 12:45 schrieb Wolfgang Schuster:
juh schrieb am 29.05.2020 um 10:29:
Dear all,
with your help I can colorize the empty even page right before a
chapter starts
on the odd page. The mwe below shows it.
Now I would like to redefine the contents of the left page on the fly
in the text
so that I could place images on this page.
I thought that I could get a simple solution by inserting a TEXpage as
even
page, but this does not work for several reasons. First a TEXpage is
not counted
correctly like a normal page. And secondly I found now way to put it
on the
even page.
So what I really want to achieve is a way to redefine this setups at
some point
in the text to insert eg. a picture on the even page before a chapter.
\startsetups [chapter:before]
\doifoddpageelse
{}
{\pushbackground[page]
\setupbackgrounds[page][background=color,backgroundcolor=blue,]
\page[empty,right]
\popbackground}
\stopsetups
As you see the image is not in the right place and of course the
pagenumbering
is wrong.
Use \startTEXpage[pagestate=start] to increase the page number with TEX
pages.
Thanks for this hint.
I want that one of these blue pages shows an image. Is this possible?
Yes but there are different ways for different requirements.
- Do you you have a picture before *every* chapter?
No, the additional image page shall appear only if the last chapter ends
on an odd page. Then I need the image page to push the new chapter to
the next odd page.
- Do you use full page images?
- Are the images cropped to fit the page dimension, stretched or
centered with margins?
For this usecase images are blown up and cropped to fit the page
dimension including the bleed.
\setuppagenumbering
[alternative=doublesided]
\setupexternalfigures
[location=default]
\definedataset [chapter]
\startsetups [chapter:before]
\page[yes]
\doglobal\increment\ChapterCounter
\doifoddpageelse
{}
{\doifsomething
{\datasetvariable{chapter}{\ChapterCounter}{image}}
{\startlayout[page]
\centerbox{\externalfigure
[\datasetvariable{chapter}{\ChapterCounter}{image}][factor=min]}
\stoplayout}}
\stopsetups
\setuphead
[chapter]
[page=,
beforesection=\directsetup{chapter:before},
insidesection={\setdataset[chapter][\ChapterCounter][image=\structureuservariable{image}]}]
\setupexternalfigure[location=default]
\starttext
\startchapter [title={Tufte}] [image=cow]
\dorecurse{4}{\samplefile{tufte}}
\stopchapter
\startchapter [title={Knuth}] [image=mill]
\dorecurse{8}{\samplefile{knuth}}
\stopchapter
\startchapter [title={Zapf}] [image=hacker]
\dorecurse{6}{\samplefile{zapf}}
\stopchapter
\stoptext
Wolfgang
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