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1,221 bytes removed ,  08:32, 20 July 2022
cleaned up first example
The following code is an example of how to draw a graphic on every page of a document. The graphic (a grey rectangle) appears in a different place for each chapter, and the chapter number appears in the rectangle as well. This is often called a thumb index - your thumb can flip the pages of a book while you watch the contents flash past...
<texcode>
% by Hans Hagen, of course :-)
<context source="yes">% these first lines are just for wiki layout and visualisation\unprotected setuppapersize[A8][A5,landscape] \defshowframe\rawsectionnumber#1{setuppaper[nx=4,ny=2]\countervalue{setuparranging[XY]\??se#1}} % will be in kernelusemodule[visual]
\setuppagenumbering [alternative=doublesided] \setupcolors [state=start] \setupbackgrounds [page] [background=thumbs] def\defineoverlaycurrentchapternumber [thumbs] [\setups{thumbs}] \def\NOfChapterssomenamedheadnumber{4chapter} % i need to make this one available \startsetups thumbs  \definemeasure[thumbheight][\dimexpr\paperheight/\NOfChapters\relax]  \vbox to \paperheight \bgroup \vskip \rawsectionnumber{section-2current} \measure{thumbheight} \vskip -1 \measure{thumbheight} \doifoddpageelse\hfill\donothing \framed [background=color, backgroundcolor=darkgray, frame=off, foregroundcolor=white, height=\measure{thumbheight},width=1cm] {\bfa \rawsectionnumber{section-2}} \doifoddpageelse\donothing\hfill \vss \egroup \stopsetups \starttext
\chapter{first} \dorecurse{10}{def\input tufte }lastchapternumber\chapter {second} \dorecursesomenamedheadnumber{10}{\input davis }\chapter{third} \dorecurse{10}{\input zapf }\chapter{fourth} \dorecurse{10}{\input bryson } \stoptext</texcode>  <context>% by Hans Hagen, of course :-) \unprotected \def\rawsectionnumber#1{\countervalue{\??se#1last}} % will be in kernel
\setuppagenumbering
[alternative=doublesided]
 
\setupcolors
[state=start]
\setupbackgrounds
[\setups{thumbs}]
\defnewdimen\NOfChapters{4} % i need to make this one availablethumbheight
\startsetups thumbs
\ifnum \lastchapternumber > 0 \definemeasure[thumbheight][=\dimexpr\paperheight/\NOfChapterslastchapternumber\relax] \fi
\vbox to \paperheight \bgroup
\vskip \rawsectionnumber{section-2} currentchapternumber \measure{thumbheight} \vskip -1 \measure{thumbheight}
\doifoddpageelse\hfill\donothing
\framed
[background=color,
backgroundcolor=darkgrayblue,
frame=off,
foregroundcolor=white,
height=\measure{thumbheight}, width=1cm5mm] {\bfa \rawsectionnumber{section-2}currentchapternumber}
\doifoddpageelse\donothing\hfill
\vss
\starttext
\chapterdorecurse{first4} \dorecurse{10}{\input tufte }\chapter{second} \dorecursefakewords{101}{\input davis 5}}\chapter{third} \dorecurse{10}{\input zapf }\chapterfakewords{fourth50} \dorecurse{10100}{\input bryson }
\stoptext

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