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%D \module
%D [ file=s-pre-03,
%D version=1998.09.06,
%D title=\CONTEXT\ Style File,
%D subtitle=Presentation Environment 3,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%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 This is the third environment for typesetting interactive
%D presentations. I used this style for a talk on \TEX\ and
%D \JAVASCRIPT\ at \TUG98, mainly because I didn't want to
%D use the same style three times. Therefore this is a rather
%D simple, silly style.
\usemodule[pre-general]
%D \macros
%D {setupbodyfont}
%D
%D We use a large bodyfont. Combined with the fancy
%D background, this does not leave that much room for text, but
%D presentations should use much text anyway.
\startmode[asintended] \setupbodyfont[lbr] \stopmode
\setupbodyfont[14.4pt]
%D \macros
%D {setuppapersize,setuplayout,setupinteractionscreen}
%D
%D The page dimensions are set to size \type {S6}, being
%D 600pt by 450pt. We use wide margins and discard headers
%D and footers. We also launch the document full screen.
\setuppapersize
[S6][S6]
\setuplayout
[width=middle,
height=middle,
topspace=75pt,
backspace=100pt,
header=0pt,
footer=0pt]
\setupinteractionscreen
[option=max]
%D \macros
%D {setupcolors,definecolor}
%D
%D Next, color support is turned on and a dark red color is
%D defined. Other red shades will be derived from this one
%D color.
\setupcolors
[state=start]
\definecolor [PageColor] [black]
\definecolor [BackgroundColor] [s=.85]
\definecolor [OrnamentColor] [r=.75]
%D \macros
%D {setupinteraction}
%D
%D We turn on interaction mode and use the same color for
%D hyperlinks and redundant hyperlinks (the ones that point
%D to the current page).
\setupinteraction
[state=start,
contrastcolor=OrnamentColor,
color=OrnamentColor]
%D \macros
%D {defineoverlay, setupbackgrounds}
%D
%D The joke in this presentation is the elliptical shape of
%D which the bottom part includes a page indication.
\defineoverlay
[PageShape][\useMPgraphic{PageShape}]
% \startuseMPgraphic{PageShape}
% lin := 20pt ; off := .75lin ;
% wid := \overlaywidth ; hei := \overlayheight ;
% pos := \currentpage ; tot := \lastpage ;
% path bb; bb := unitsquare xscaled wid yscaled hei ;
% filldraw bb withcolor \MPcolor{PageColor} ;
% pickup pencircle xscaled .5lin yscaled lin rotated 45 ;
% pair r, t, l, b ;
% r := (wid-off,.5hei) ; t := (.5wid,hei-off) ;
% l := (off,.5hei) ; b := (.5wid,off) ;
% path p; p := superellipse(r,t,l,b,.8) ;
% fill p withcolor \MPcolor{Backgroundcolor} ;
% draw p withcolor \MPcolor{OrnamentColor} ;
% color contrastcolor ; contrastcolor = 2/3 * \MPcolor{OrnamentColor} ;
% if (pos>0) and (tot>0):
% pair pa ; pa := point 5 of p ;
% pair pb ; pb := point 7 of p ;
% draw pa withcolor contrastcolor ;
% draw pb withcolor contrastcolor ;
% len := 2/tot ;
% pair pa ; pa := point (5+len*pos) of p ;
% pair pb ; pb := point (5+len*(pos-1)) of p ;
% p := p cutafter pa ;
% p := p cutbefore pb ;
% draw p withcolor contrastcolor ;
% fi ;
% setbounds currentpicture to bb ;
% \stopuseMPgraphic
\startuseMPgraphic{PageShape}
StartPage ;
path p ; pair pa, pb ; numeric len ; color contrastcolor ;
fill Page withcolor \MPcolor {PageColor} ;
pickup pencircle rotated 45 xscaled 10pt yscaled 20pt ;
p := Page enlarged (-10pt,-15pt) superellipsed .8 ;
p := p shifted (-1.5pt,0) ; % looks better
fill p withcolor \MPcolor{BackgroundColor} ;
draw p withcolor \MPcolor{OrnamentColor} ;
contrastcolor = 2/3 * \MPcolor{OrnamentColor} ;
if (PageNumber>0) and (NOfPages>0):
draw point 5 of p withcolor contrastcolor ;
draw point 7 of p withcolor contrastcolor ;
len := 2/NOfPages ;
pa := point (5+len*PageNumber) of p ;
pb := point (5+len*(PageNumber-1)) of p ;
draw (p cutafter pa) cutbefore pb
withcolor contrastcolor ;
fi ;
StopPage ;
\stopuseMPgraphic
%D We use the viewer provided feature to go to the previous or
%D next page.
\defineoverlay[PrevButton][\overlaybutton{PreviousPage}]
\defineoverlay[NextButton][\overlaybutton{NextPage}]
\setupbackgrounds
[page]
[background={PageShape,PrevButton}]
\setupbackgrounds
[text][text]
[background=NextButton]
% or using hard coded next/prev pages:
%
% \defineoverlay[PrevButton][\overlaybutton{previouspage}]
% \defineoverlay[NextButton][\overlaybutton{nextpage}]
%
% \setupbackgrounds[state=repeat]
% \setupbackground[text][text][background=NextButton]
%
% or simply (using an repeated layer):
%
% \setupbackground[text][background=NextButton]
%D \macros
%D {definehead, setuphead}
%D
%D Like the other presentation styles, we use \type {\Topic}
%D instead of \type {\chapters}. This time we don't provide
%D an additional sectioning. So we have:
%D
%D \starttyping
%D \TitlePage{How nice}
%D
%D \Topics{This is about ...}
%D
%D \Topic{The first one}
%D
%D \Topic{Another one}
%D \stoptyping
\definehead [Topic] [chapter]
\definehead [Nopic] [title]
\setuphead
[Topic,Nopic]
[after={\blank[3*medium]},
number=no,
style=\tfb,
page=yes,
alternative=middle]
\setuplist
[Topic]
[alternative=g,
interaction=all,
before=,
after=]
\def\Subject
{\Topic}
%D The tables of contents is associated with \type
%D {\Topics}.
\def\Topics#1%
{\Nopic[Topics]{#1}
\placelist[Topic][criterium=all]}
\def\Subjects
{}
%D Instead of \type {\TitlePage}, one can use the pair
%D \type {\StartTitlePage} -- \type {\StopTitlePage}:
%D
%D \starttyping
%D \StartTitlePage
%D A Self Made Title
%D \StopTitlePage
%D \stoptyping
\def\StartTitlePage%
{\startstandardmakeup
\bfd\setupinterlinespace
\setupalign[middle]
\vfil
\def\\{\vfil\bfb\setupinterlinespace}}
\def\StopTitlePage%
{\vfil\vfil\vfil
\stopstandardmakeup}
\def\TitlePage#1%
{\StartTitlePage#1\StopTitlePage}
\doifnotmode{demo}{\endinput}
%D The (rather silly) demo section.
\starttext
\TitlePage{Title Page\\pre-funny}
\Topics{Some Nice Quotes}
\Topic{A Few}
\Subject{Knuth} \input knuth
\Subject{Tufte} \input tufte
\Topic{Some More}
\Subject{Zapf} \input zapf
\Subject{Bryson} \input bryson
\stoptext
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