%D \module
%D   [      file=s-pre-12,
%D        version=1999.08.20,
%D          title=\CONTEXT\ Style File,
%D       subtitle=Presentation Environment 12,
%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.

\setuppapersize
  [S6][S6]

\setuplayout
  [topspace=0cm,
   backspace=0cm,
   header=0pt,
   footer=0pt,
   width=middle,
   height=middle]

\setupbodyfont
  [14.4pt,lbr]

\setupcolors
  [state=start]

\setupinteraction
  [click=no,
   display=new,
   state=start]

\setupinteractionscreen
  [option=max]

\def\SomeShape%
  {\resetMPdrawing
   \startMPdrawing
     path p ; pair a, b ;
     ahlength := .375cm ;
     StartPage ;
     draw Page %unitsquare
       %xscaled PaperWidth yscaled PaperHeight
       withpen pencircle scaled .5cm
       withcolor \MPcolor{EdgeColor} ;
   \stopMPdrawing
   \dorecurse{\CurrentTopic}
     {\startMPdrawing
        initialize_box(\MPpos{topic-\realfolio-\recurselevel}) ;
        p := tensecircle (wxy,hxy,.25cm) shifted cxy ;
        fill p withcolor .9white  ;
        pickup pencircle scaled .25cm ;
        \ifnum\recurselevel=\CurrentTopic
          draw p withcolor \MPcolor{ShowColor} ;
          a := bot point 7 of p ;
        \else
          draw p withcolor \MPcolor{DoneColor} ;
        \fi
      \stopMPdrawing}
   \dorecurse{\CurrentMaxItem}
     {\startMPdrawing
        initialize_box(\MPpos{item-\realfolio-\recurselevel}) ;
        linewidth := .25cm ;
        p := tensecircle (wxy,hxy,linewidth) shifted cxy ;
        fill p withcolor .9white  ;
        pickup pencircle scaled linewidth ;
        b := rt point 3 of p ;
        \ifnum\recurselevel=\CurrentMaxItem
          draw p withcolor \MPcolor{ShowColor} ;
        \else
          draw p withcolor \MPcolor{DoneColor} ;
        \fi
        dxab := xpart a-xpart b ;
        dyab := ypart a-ypart b ;
        sign := if dyab>0 : - fi 1 ;
        drawarrow
          a --
          a shifted (+2linewidth-dxab/2,0) {left} ..
          if abs(dyab)>4linewidth :
            a shifted (-dxab/2,+sign*2linewidth) --
            b shifted (+dxab/2,-sign*2linewidth) ..
          fi
          {left} b shifted (-2linewidth+dxab/2,0) --
          b
          withcolor \MPcolor{ArrowColor} ;
      \stopMPdrawing}%
   \startMPdrawing
     StopPage ;
   \stopMPdrawing
   \MPdrawingdonetrue
   \getMPdrawing}

\definecolor[PageColor][r=.5,g=.4,b=.3]
\definecolor[LineColor][r=.7,g=.6,b=.5]

\definecolor[PageColor]  [s=.60]
\definecolor[ShowColor]  [r=.40]
\definecolor[EdgeColor]  [g=.40]
\definecolor[DoneColor]  [r=.40,g=.40]
\definecolor[ArrowColor] [b=.40]
\definecolor[LineColor]  [r=.60,g=.60]
\definecolor[GotoColor]  [ArrowColor]

\setupinteraction[color=GotoColor,contrastcolor=GotoColor]

\defineoverlay [shape] [\SomeShape]
\defineoverlay [next]  [\overlaybutton{forward}]

\setupbackgrounds
  [page]
  [background={color,next,shape},
   backgroundcolor=PageColor]

\doglobal\newcounter\CurrentItem
\doglobal\newcounter\CurrentTopic
\doglobal\newcounter\CurrentMaxItem

\def\StartIdea%
  {\doglobal\newcounter\CurrentItem}

\def\StartTopic%
  {\doglobal\increment\CurrentTopic
   \dostartbuffer[topic-\CurrentTopic][StartTopic][StopTopic]}

\def\StopIdea%
  {\dorecurse{\CurrentItem}
     {\let\CurrentMaxItem\recurselevel
      \doStopIdea}}

\def\IdeaWidth {.6\makeupwidth} % .5
\def\TopicWidth{.2\makeupwidth} % .3

\def\doStopIdea%
  {\startstandardmakeup
   \dontcomplain
   \vbox to \makeupheight
     {\vskip.75cm \relax % \vfill
      \dorecurse{\CurrentMaxItem}
        {\edef\Item{item-\realfolio-\recurselevel}
         \hbox to \makeupwidth
           {\hskip.75cm
            \hpos
              {\Item}
              {\framed
                 [width=\IdeaWidth,frame=off,
                  align=middle,offset=.125cm]
                 {\getbuffer[item-\recurselevel]}}}
         \vskip.875cm}
      \vfill}
   \vskip-\makeupheight
   \vbox to \makeupheight
     {\vskip.75cm \relax
      \dorecurse{\CurrentTopic}
        {\edef\Topic{topic-\realfolio-\recurselevel}
         \hbox to \makeupwidth
           {\hfill
            \hpos
              {\Topic}
              {\framed
                 [width=\TopicWidth,frame=off,
                  align=middle,offset=.25cm]
                 {\getbuffer[topic-\recurselevel]}}%
            \hskip.75cm}
         \vskip.875cm}
      \vfill}
   \stopstandardmakeup}

\def\StartItem%
  {\doglobal\increment\CurrentItem
   \dostartbuffer[item-\CurrentItem][StartItem][StopItem]}

\lefthyphenmin =\maxdimen
\righthyphenmin=\maxdimen

\def\TitlePage#1%
  {\startstandardmakeup
     \setupalign[middle]
     \def\\{\vfil\bfb\setupinterlinespace}
     \bfd\setupinterlinespace
     \vfil#1\vfil\vfil
   \stopstandardmakeup}

\doifnotmode{demo}{\endinput}

\starttext

\StartIdea
  \StartTopic
     What a topic
  \StopTopic
  \StartItem
    \input reich \relax
  \StopItem
  \StartItem
    \input reich \relax
  \StopItem
  \StartItem
    \input reich \relax
  \StopItem
\StopIdea

\StartIdea
  \StartTopic
     One More Nice Idea
  \StopTopic
  \StartItem
    \input reich \relax
 \StopItem
  \StartItem
    \input reich \relax
  \StopItem
\StopIdea

\StartIdea
  \StartTopic
     The Last Idea
  \StopTopic
  \StartItem
    \input tufte \relax
  \StopItem
\StopIdea

\stoptext