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{{todo | this page needs to be cleaned up}}
<texcode>
% by Hans Hagen, of course :-)
\setupcolors
[state=start]
remove todo template
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...
<context source="yes">% these first lines are just for wiki layout and visualisation\unprotected setuppapersize[A8][A5,landscape] \showframe\setuppaper[nx=4,ny=2]\setuparranging[XY]\usemodule[visual] \def\rawsectionnumber#1currentchapternumber {\countervaluesomenamedheadnumber{chapter}{current}} \??se#1def\lastchapternumber {\somenamedheadnumber{chapter}{last}} % will be in kernel
\setuppagenumbering
[alternative=doublesided]
\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
</texcodecontext>
== Another Example ==
An example (MkIV) for using Metapost to create thumb indices for chapters.
<texcodecontext source="yes">% these first lines are just for wiki layout and visualisation\setuppapersize[A8][A4]\showframe\setuppaper[A4nx=4,oversizedny=4]\setuparranging[XY]\usemodule[visual]
\setuplayout
\starttext \showframe
\dorecurse{63}{\chapter{Test Chapter #1} Chapter \somestructureheadnumbersomeheadnumber[chapter][current] of \somestructureheadnumbersomeheadnumber[chapter][last]
\dorecurse{9}{\section{Test Section}
Section \somestructureheadnumbersomeheadnumber[section][current] of \somestructureheadnumbersomeheadnumber[section][last] \blank \input tufte \par \input knuth fakewords{10}{20} \par
}
}
\stoptext
</texcodecontext> [[Category:Sample documents]][[Category:Graphics]]
