%D \module
%D   [      file=s-present-weird, % s-pre-17,
%D        version=1999.08.20,
%D          title=\CONTEXT\ Style File,
%D       subtitle=Presentation Environment Weird,
%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.

\startmodule[present-balls]

%D This is a rather old style, adn I used it for a presentation about \MATHML\
%D around the turn of the century. Unfortunately I can't find back that weird
%D presentation. I didn't change the code apart from loading the body font. One can
%D clock on an area and get it large. Clicking elsewhere brings back the main page.
%D It was actualy a zoom test at that time.

\setupbodyfont
  [dejavu,11pt,ss]

\setupsystem
  [random=medium]

\setupbackgrounds
  [state=repeat]

\setupbackgrounds
  [page]
  [background={page,forward}]

\setupbackgrounds
  [text][text]
  [background=blowdown]

\setupinteraction
  [state=start,
 % click=off,
   color=TitleColor,
   contrastcolor=TitleColor]

\setupinteractionscreen
  [option=max]

\setuptolerance
  [verytolerant,stretch]

\definecolor [BackColor]  [s=.30]
\definecolor [PageColor]  [g=1]
\definecolor [FrameColor] [r=1]
\definecolor [TitleColor] [y=1]
\definecolor [ArrowColor] [b=1]

\defineoverlay [title]    [\useMPgraphic{title}]
\defineoverlay [page]     [\useMPgraphic{page}]
\defineoverlay [blowup]   [{\hboxreference[whatever:\CurrentBlaBla]{\overlaybutton{whatever:\CurrentBlaBla}}}]
\defineoverlay [blowdown] [{\hboxreference[page:\realfolio]{\overlaybutton{page:\realfolio}}}]
\defineoverlay [forward]  [\overlaybutton{forward}]

\startMPpositiongraphic{mppos:connection}
    path pa, pb, pc ; pair ca, cb ;
    initialize_box(\MPpos{\MPvar{self}}) ; pa := pxy ; ca := cxy ;
    initialize_box(\MPpos{\MPvar{prev}}) ; pb := pxy ; cb := cxy ;
    pickup pencircle scaled .5pt ;
    pa := pa enlarged 10pt ;
    pb := pb enlarged 10pt ;
    for i=1 upto 10 :
        draw pa randomized 20pt withcolor \MPcolor{FrameColor} ;
    endfor ;
    if \MPp{\MPvar{prev}} > 0 :
        pair a, b, c, d ;
        for i=1 upto 25 :
            a := .5[ulcorner pa,urcorner pa] randomized (10pt,10pt) ;
            b := .5[llcorner pb,lrcorner pb] randomized (20pt,10pt) ;
            c := .5[a,b] rotatedaround(a,-25) randomized (5pt,5pt) ;
            d := .5[a,b] rotatedaround(a,+25) randomized (5pt,5pt) ;
            draw (a--b) withcolor \MPcolor{ArrowColor} ;
            draw (d--a--c) withcolor \MPcolor{ArrowColor} ;
        endfor ;
    fi ;
    anchor_box(\MPanchor{\MPvar{self}}) ;
\stopMPpositiongraphic

\startuseMPgraphic{title}
    pickup pencircle scaled .5pt ;
    for i=1 upto 10 :
        draw fullsquare
            xyscaled(OverlayWidth,OverlayHeight)
            enlarged 10pt randomized 20pt
            withcolor \MPcolor{TitleColor} ;
    endfor ;
\stopuseMPgraphic

\startuseMPgraphic{page}
    StartPage ;
        pickup pencircle scaled .5pt ;
        fill Page withcolor \MPcolor{BackColor} ;
        for i=1 upto 20 :
            draw Page enlarged -50pt randomized 50pt withcolor \MPcolor{PageColor} ;
        endfor ;
    StopPage ;
\stopuseMPgraphic

\newcounter\CurrentBlaBla

\defineframedtext
   [ZoomText]
   [before=,
    after=,
    width=fit,
    align=flushleft,
    frame=off,
    foregroundcolor=white]

\starttexdefinition StartText
    \begingroup
    \getrandomdimen\scratchdimen{250pt}{350pt}
    \edef\TextWidth{\the\scratchdimen}
    \setbox\scratchbox\hbox\bgroup
        \hsize\TextWidth
        \ZoomText\bgroup
\stoptexdefinition

\starttexdefinition StartTextSimple
    \begingroup
    \setbox\scratchbox\hbox\bgroup
        \framed [
            frame=off,
            foregroundcolor=white
        ]
        \bgroup
\stoptexdefinition

\starttexdefinition StopTextSimple
    \StopText
\stoptexdefinition

\starttexdefinition StopText
        \egroup
    \egroup
    \doglobal\increment\CurrentBlaBla
    \let\PrevBlaBla\CurrentBlaBla \doglobal\decrement\PrevBlaBla
    \let\NextBlaBla\CurrentBlaBla \doglobal\increment\NextBlaBla
    \setMPpositiongraphic {
        connection:\CurrentBlaBla
    }{
        mppos:connection
    }{
        seed=\CurrentBlaBla,
        prev=connection:\PrevBlaBla,
        next=connection:\NextBlaBla
    }
    \hbox to 600pt \bgroup
        \setupinteraction[focus=frame]
        \getrandomdimen\scratchdimen{50pt}{75pt}
        \hskip0pt plus \scratchdimen minus \scratchdimen
        \hpos {
            connection:\CurrentBlaBla
        }{
            \framed [
                frame=off,
                offset=overlay,
                backgroundoffset=50pt,
                background=blowup
            ] {
                \box\scratchbox
            }
        }
        \getrandomdimen\scratchdimen{50pt}{75pt}
        \hskip0pt plus \scratchdimen minus \scratchdimen
    \egroup
    \getrandomdimen\scratchdimen{75pt}{125pt}
    \vskip\scratchdimen
    \endgroup
\stoptexdefinition

\dontcomplain

\disablemode[SpreadPage]

\starttexdefinition StartPage #1
    \doglobal\increment(\CurrentBlaBla,100)%
    \setvariables[StartPage][title={#1}]
    \setbox\scratchbox\hbox\bgroup
        \valign\bgroup
            \ignorespaces
            \alignmark\alignmark
            \vss
            \cr
\stoptexdefinition

\starttexdefinition StopPage
    \cr
    \egroup
    \egroup
    \setbox\scratchbox\vbox\bgroup
        \vskip100pt
        \doifelsemode {SpreadPage} {
            \hbox spread 200pt
        } {
            \hbox to \wd\scratchbox
        }
        \bgroup
            \setupinteraction[focus=frame]
            \hss
            \switchtobodyfont[big]%
            \bfd
            \doglobal\increment\CurrentBlaBla
            \setupinterlinespace
            \hpos {
                title:\realfolio
            }{
                \framed [
                    frame=off,
                    offset=overlay,
                    backgroundoffset=50pt,
                    background=blowup
                ] {
                    \framed [
                        frame=off,
                        align=middle,
                        foregroundcolor=white,
                        background=title
                    ] {
                        \getvariable{StartPage}{title}
                    }
                }
            }
            \hss
        \egroup
        \vskip100pt
        \box\scratchbox
    \egroup
    \normalexpanded {
        \definepapersize [
            MasterPage
        ] [
            width=\the\dimexpr\wd\scratchbox+100pt\relax,
            height=\the\dimexpr\ht\scratchbox+\dp\scratchbox+100pt\relax
        ]
    }
    \setuppapersize
        [MasterPage]
        [MasterPage]
    \setuplayout [
        topspace=50pt,
        backspace=50pt,
        width=middle,
        header=0pt,
        footer=0pt,
        height=middle
    ]
    \centerbox {
        \box\scratchbox
    }
   \page
\stoptexdefinition

\starttexdefinition StartTopic #1
    \removeunwantedspaces
    \cr
    \doglobal\increment(\CurrentBlaBla,100)%
    \vbox\bgroup
        \vskip100pt
        \bgroup
            \definecolor[FrameColor][TitleColor]
            \switchtobodyfont[big]
            \bfd
            \setupinterlinespace
            \StartTextSimple
                \ignorespaces
                #1
                \removeunwantedspaces
            \StopTextSimple
            \vskip25pt
        \egroup
\stoptexdefinition

\starttexdefinition StopTopic
    \vskip-\lastskip
    \vskip100pt
    \egroup
    \ignorespaces
\stoptexdefinition

\starttexdefinition TitlePage #1
    \begingroup
        \def\\{\vskip1ex\bfc\def\\{\vskip1ex\bfb}}
        \enablemode[SpreadPage]
        \StartPage{#1}
        \StopPage
    \endgroup
\stoptexdefinition

\stopmodule

\continueifinputfile{s-present-balls.mkiv}

\inputpresentationfile{examples/present-weird-001.tex}