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%D \module
%D [ file=s-pre-14,
%D version=1999.08.20,
%D title=\CONTEXT\ Style File,
%D subtitle=Presentation Environment 14,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D In the process of making a couple of simple styles for
%D \EUROTEX\ 99, I came to this one. The joke is in the
%D pagenumber. This style can be used for short presentations
%D with much text.
\startmode[asintended] \setupbodyfont[lbr] \stopmode
\setupbodyfont[14.4pt]
%D Since we expect text, we can best be very tolerant.
\setuptolerance
[verytolerant,stretch]
%D As most styles we choose a large screen page size.
\setuppapersize
[S6][S6]
\setuplayout
[width=fit,
rightedge=3cm,
margin=0pt,
rightedgedistance=2cm,
height=middle,
header=0pt,
footer=0pt,
topspace=1cm,
backspace=1cm]
%D We only use two colors, named \type {One} and \type
%D {Two}:
\setupcolors
[state=start]
\definecolor [One] [r=.6,g=.4,b=.4]
\definecolor [Two] [r=.4,g=.6,b=.6]
%D If you've looked at the demo file, you will have noticed
%D that the background consists of four pieces: two filled
%D rectangles and two half numbers. These are put on th epage
%D using four overlays:
\setupbackgrounds
[page]
[background={one,two,three,four}]
%D When we code this in \TEX, we get the following
%D definitions. As an alternative we coudl have used layers
%D but I'm afraid that it would not have led to less code.
\defineoverlay
[one]
[{\framed
[frame=off,background=color,backgroundcolor=Two,
width=\overlaywidth,height=\overlayheight]
{}}]
\defineoverlay
[three]
[{\hbox to \overlaywidth
{\hfill\SetOverlayWidth
\framed
[frame=off,background=color,backgroundcolor=One,
width=\overlaywidth,height=\overlayheight]
{}}}]
%D We could have used the main backgroundcolor instead of
%D overlay \type {one}.
\definefont[NumberFont][RegularBold at 3cm]
\defineoverlay
[two]
[{\framed
[frame=off,width=\overlaywidth,height=\overlayheight,
offset=overlay]
{\vfill
\NumberFont\setstrut\SetOverlayWidth
\hbox to \hsize
{\hfill
\setupinteraction[style=,color=]%
\setbox0=\hbox{\strut\One\pagenumber}%
\hbox to 0pt{\hss\gotobox{\box0}[previouspage]\hss}%
\hskip\overlaywidth}}}]
\defineoverlay
[four]
[{\framed
[frame=off,width=\overlaywidth,height=\overlayheight,offset=overlay]
{\vfill
\hbox to \hsize
{\hfill
\SetOverlayWidth
\framed
[frame=off,width=\overlaywidth,height=\overlayheight,offset=overlay]
{\vfill\NumberFont\setstrut
\setbox0=\hbox{\strut\Two\pagenumber}%
\setbox2=\hbox{\clip[nx=2,ny=1,x=2,y=1]{\copy0}}%
\dp2=\dp0
\hbox to \hsize{\hbox to 0pt{\hss\hskip.5\wd0\box2\hss}\hfill}}}}}]
\def\SetOverlayWidth%
{\scratchdimen = \rightedgedistance
\divide\scratchdimen by 2
\advance\scratchdimen by \rightedgewidth
\advance\scratchdimen by \backspace
\edef\overlaywidth{\the\scratchdimen}}
%D A much cleaner implementation is the following. If you hate
%D \METAPOST, you can run this style in the specified mode:
\startnotmode[no-metapost]
\setupbackgrounds
[page]
[background={number}]
\defineoverlay[number][\useMPgraphic{number}]
\startuseMPgraphic{number}
StartPage ;
path Vage ; picture Left, Right ;
x1 = x2 = xpart (llcorner Field[Text][RightEdge] shifted (-RightEdgeDistance/2,0)) ;
y1 = ypart llcorner Page ;
y2 = ypart ulcorner Page ;
Vage := llcorner Page -- z1 -- z2 -- ulcorner Page -- cycle ;
fill Page withcolor \MPcolor {One} ;
fill Vage withcolor \MPcolor {Two} ;
if PageNumber>0 :
defaultfont := "\truefontname{RegularBold}" ;
Left := Right := thelabel("\folio",origin) ysized 3cm ;
clip Right to boundingbox Right shifted (bbwidth(Right)/2,0) ;
draw Left shifted z1 shifted (0,2.25cm) withcolor \MPcolor {One} ;
draw Right shifted z1 shifted (0,2.25cm) withcolor \MPcolor {Two} ;
fi ;
StopPage ;
\stopuseMPgraphic
\stopnotmode
%D We use the simple label typesetting present in \METAPOST\
%D because digits are seldom kerned so real \TEX ing is not
%D needed. As in the previous method, we let the graphics
%D overlap so that we don't get white lines due to rounding
%D problems in viewers.
%D
%D We put a button behind the text (this overlay is calculated
%D each page).
\defineoverlay
[nextpage]
[\overlaybutton{nextpage}]
\setupbackgrounds
[text]
[backgroundoffset=.5cm,
background=nextpage]
%D We still have to turn on interaction mode.
\setupinteraction
[state=start,
display=new,
menu=on]
\setupinteraction
[color=,
contrastcolor=]
%D Next we define structuring commands.
\definehead[Topic] [chapter] \setuphead[Topic] [style=\bfc]
\definehead[Subject][section] \setuphead[Subject][style=\bfa]
\setuphead
[Topic, Subject]
[number=no,
after={\blank[big]}]
%D Because we will provide a menu, we don't offer lists.
\let\Topics \gobbleoneargument
\let\Subjects\relax
%D The table of contents goes to the right edge.
\startinteractionmenu[right]
\setupinteraction
[color=black,
contrastcolor=Two]
\placelist
[Topic]
[alternative=e,
frame=off,
criterium=all]
\vfill
\stopinteractionmenu
\setuplist
[Topic]
[width=\rightedgewidth,
maxwidth=\rightedgewidth,
style=\bfa]
%D We safe some space:
\setupwhitespace
[medium]
\setupblank
[medium]
%D In the titlepage, we still use the \TEX\ overlays,
%D so that we don't have to define a second graphic.
\def\TitlePage#1%
{\StartTitlePage#1\StopTitlePage}
\def\StartTitlePage%
{\bgroup
\setupbackgrounds[page][background={one,three}]
\startstandardmakeup
\setupalign[middle]
\def\\{\vfil\bfb\setupinterlinespace}
\bfd\setupinterlinespace
\vfil}
\def\StopTitlePage%
{\vfil\vfil\vfil
\stopstandardmakeup
\egroup}
%D This is it.
\doifnotmode{demo}{\endinput}
\starttext
\TitlePage{Some Quotes\\(that you probably know by now)}
\Topic{Tufte} \input tufte
\Topic{Knuth} \input knuth
\Topic{Reich} \input reich
\Topic{Zapf} \input zapf
\Topic{Materie} \input materie
%Topic{Stork} \input stork
\stoptext
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