<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">% This is a demonstration file distributed with the
% Lecturer package (see lecturer-doc.pdf).
%
% You can recompile the file with a basic TeX implementation,
% using pdfTeX or LuaTeX with the plain format.
% 
% The reusable part ends somewhere around line 200.
%
% Author: Paul Isambert.
% Date: July 2010.

\input lecturer

\font\ttit=cmitt10

\setparameter job:
  fullscreen     = true
  normal         = layers
  autofullscreen = true
  font           = \tt

\newcolor{greent}{rgb}[.8]{.8 1 .8}
\setparameter slide:
  width      = 18cm
  right      = 5cm
  hpos       = fr
  top        = 2cm
  vsize      = 6cm
  vpos       = center
  image      = universe
  foreground = greent
  bookmark   = false

% Courtesy of NASA/ESA/Hubble etc.
% Jet in Carina, it's called. Plus  WFC3 UVIS Full Field. No less.
\newimage{universe}[18cm,]{universe.jpg}

  
%
% The screen behind the main text.
%
\newcolor{tgreen}{rgb}[.6]{0 .8 0}
\setarea{main}
  vshift     = 2cm
  vshift*    = 4cm
  hshift*    = 4cm
  background = tgreen
  frame      = "width = .5cm, corner = round"


%
% The fantastic control board.
%
\newshade{metal}
  model = gray
  from  = .8
  to    = 0
  speed = 1.8

\setarea{control}
  vshift*    = 0pt
  height     = 2cm
  background = metal
  topskip    = 0pt

% The lights on the left.
\newcolor{darkred}{rgb}{.8 0 0}
\newsymbol\lightoff[padding=0pt]{%
  color gray .8,
  pen 1.5, 10 0, stroke,
  color darkred, move + -.5 .7,
  circle ul 4.5, circle ld 4.5, fill
  }
\newsymbol\lighton[padding=0pt]{%
  color gray .8,
  pen 1.5, 10 0, stroke,
  color rgb .4 .8 .4, move + -.5 .7,
  circle ul 4.5, circle ld 4.5, fill
  }
% The big circular button.
\newcolor{twhite}{grey}[.5]{1}
\newcolor{tblack}{cmyk}[.3]{0 0 0 1}
\newsymbol\bigbutton{%
  color red,
  circle ur 20, circle rd 20, circle dl 20, circle lu 20,fill,
  color twhite, pen 2, move 20 16, circle rd 16,stroke,
  color tblack, move 20 -16, circle lu 16,stroke,
  }
% The red button, for the circle.
\newsymbol\showcircle[1em,padding=0pt]{%
  color grey .6,
  move -.2 1.3,  -.2 -1.3, 1.2 -1.3,  fill,
  color grey .1,
  move -.2 1.3, 1.2 1.3, 1.2 -1.3,  fill,
  color rgb 1 .4 .4,
  move 0 .5, + 1 0, + 0 .5, + -1 0,fill,
  color rgb .3 0 0,
  move 0 0, + 1 0, + 0 .5, + -1 0,fill,
  color rgb .6 0 0,
  move 0 -1, + 1 0, + 0 1, + -1 0,fill,
  }
\newsymbol\hidecircle[1em,padding=0pt]{%
  color grey .6,
  move -.2 1.3,  -.2 -1.3, 1.2 -1.3,  fill,
  color grey .1,
  move -.2 1.3, 1.2 1.3, 1.2 -1.3,  fill,
  color rgb 1 .4 .4,
  move 0 0, 1 0, + 0 1, + -1 0,fill,
  color rgb .3 0 0,
  move 0 -.5, + 1 0, + 0 .5, + -1 0,fill,
  color rgb .6 0 0,
  move 0 -1, + 1 0, + 0 .5, + -1 0,fill,
  }
\newsymbol\circle[2em]{%
  pen .05, color red,
  circle ur 1, circle rd 1, circle dl 1, circle lu 1
  }
% The green button, for the crosshair.
\newsymbol\showcrosshair[1em,padding=0pt]{%
  color grey .6,
  move -.2 1.3,  -.2 -1.3, 1.2 -1.3,  fill,
  color grey .1,
  move -.2 1.3, 1.2 1.3, 1.2 -1.3,  fill,
  color rgb .4 1 .4,
  move 0 .5, + 1 0, + 0 .5, + -1 0,fill,
  color rgb 0 .3 0,
  move 0 0, + 1 0, + 0 .5, + -1 0,fill,
  color rgb 0 .6 0,
  move 0 -1, + 1 0, + 0 1, + -1 0,fill,
  }
\newsymbol\hidecrosshair[1em,padding=0pt]{%
  color grey .6,
  move -.2 1.3,  -.2 -1.3, 1.2 -1.3,  fill,
  color grey .1,
  move -.2 1.3, 1.2 1.3, 1.2 -1.3,  fill,
  color rgb .4 1 .4,
  move 0 0, 1 0, + 0 1, + -1 0,fill,
  color rgb 0 .3 0,
  move 0 -.5, + 1 0, + 0 .5, + -1 0,fill,
  color rgb 0 .6 0,
  move 0 -1, + 1 0, + 0 .5, + -1 0,fill,
  }
\newsymbol\crosshair[2em]{%
  pen .03,
  color rgb .4 1 .4,
  move .5 0, + 1 0, stroke,
  move 1 -.5, + 0 1, stroke,
  }
% The blue button.
\newsymbol\shoot[1em,padding=0pt]{%
  color grey .6,
  move -.2 1.3,  -.2 -1.3, 1.2 -1.3,  fill,
  color grey .1,
  move -.2 1.3, 1.2 1.3, 1.2 -1.3,  fill,
  color rgb .4 .4 1,
  move 0 .5, + 1 0, + 0 .5, + -1 0,fill,
  color rgb 0 0 .3,
  move 0 0, + 1 0, + 0 .5, + -1 0,fill,
  color rgb 0 0 .6,
  move 0 -1, + 1 0, + 0 1, + -1 0,fill,
  }
\newsymbol\shot[1em,padding=0pt]{%
  color grey .6,
  move -.2 1.3,  -.2 -1.3, 1.2 -1.3,  fill,
  color grey .1,
  move -.2 1.3, 1.2 1.3, 1.2 -1.3,  fill,
  color rgb .4 .4 1,
  move 0 0, 1 0, + 0 1, + -1 0,fill,
  color rgb 0 0 .3,
  move 0 -.5, + 1 0, + 0 .5, + -1 0,fill,
  color rgb 0 0 .6,
  move 0 -1, + 1 0, + 0 .5, + -1 0,fill,
  }
% The villain. Alive and dead.
\newsymbol\alien[1.7em]{%
  pen .05,
  color cmyk .2 1 .4 0,
  1 0, circle ul .5, circle ld .5, fill,
  circle dl .2, circle lu .2,
  move 1 0, circle dr .2, circle ru .2,
  move .16 0, + 0 -.3,
  move .49 0, + 0 -.3,
  move .82 0, + 0 -.3,stroke,
  color cmyk 0 0 1 0,
  move .2 .25, + .2 0, move + .2 0, + .2 0
  }
\newsymbol\deadalien[1.4em]{%
  pen .05,
  color cmyk .2 1 .4 .7,
  1 0, circle ul .5, circle ld .5, fill,
  circle dl .2, circle lu .2,
  move 1 0, circle dr .2, circle ru .2,
  move .16 0, + 0 -.3,
  move .49 0, + 0 -.3,
  move .82 0, + 0 -.3,stroke,
  color cmyk 0 0 1 0,
  move .2 .25, + .2 .1, move + .2 0, + .2 -.1
  }

\setstep\hidden on = {}\par
\newcount\tempcount
% Lights are placed at every step.
\setstep\textstep
  vskip      = "0pt plus .5fil"
  everyvstep = {\position{control}[\dimexpr(1cm+\tempcount\dimexpr(10pt+.2cm)),0pt]{\quitvmode\lighton}
                \global\advance\tempcount1}


% \endinput
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                             %
% UNCOMMENT THE PREVIOUS LINE TO USE THIS FILE AS A TEMPLATE, %
% OR REMOVE EVERYTHING BELOW.                                 %
% Using it for a presentation isn't recommended, though.      %
% But you have the right to do what you want.                 %
% I take no responsability.                                   % 
%                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%





\slide[The one and only slide, anchor=start]

% Red lights.
\position{control}
         [1cm,0pt]
         {\quitvmode\lightoff\kern.2cm \lightoff\kern.2cm \lightoff\kern.2cm \lightoff\kern.2cm \lightoff\kern.2cm}
% The big button.
\position{control}
         [\dimexpr(\pdfpagewidth/2-20pt),1cm]
         {\quitvmode\goto[push]{start}{\bigbutton}}



\textstep[Say hi] Hello, Captain. Aliens have been spotted.

\textstep[Order] Use your button to show where they should appear.

\textstep[AlienAppear,transition=fade,font=\ttit] Here they are!\par
Use your crosshair to shoot'em up.

\textstep[Shoooooooooooooot,font=] Good. Now shoooooot!

\textstep[Cool,on=] Congratulations!\par
Click the red button to start again.



% The following steps have no autonomy. They appear thanks to the previous
% ones, or make each other appear.
%
% The circle.
\step[on=Order,CircleOn]
  \position{control}
           [\dimexpr(\pdfpagewidth/2)+5em,1cm]
           {\showorhide{on=Circle CircleOff,off=CircleOn}\showcircle}%
\hidden[CircleOff]
  \position{control}
           [\dimexpr(\pdfpagewidth/2)+5em,1cm]
           {\showorhide{on=CircleOn,off=Circle CircleOff}\hidecircle}%
\hidden[Circle]
  \position{main}
           [12cm,2cm]
           \circle
%
% The alien.
\step[Alien,on=AlienAppear]
  \position{main}
           [12.4cm,2cm]
           \alien
%
% The crosshair.
\step[on=AlienAppear,CrosshairOn]
  \position{control}
           [\dimexpr(\pdfpagewidth/2)+6.5em,1cm]
           {\showorhide{on=Crosshair CrosshairOff,off=CrosshairOn}\showcrosshair}%
\hidden[CrosshairOff]
  \position{control}
           [\dimexpr(\pdfpagewidth/2)+6.5em,1cm]
           {\showorhide{on=CrosshairOn,off=Crosshair CrosshairOff}\hidecrosshair}%
\hidden[Crosshair,group=true]
  \position{main}
           [12cm,1.9cm]
           \crosshair
%
% The shooting device.
\step[PrepareToShoot,on=Shoooooooooooooot]
  \position{control}
           [\dimexpr(\pdfpagewidth/2)+8em,1cm]
           {\showorhide{on=ShotDone Cool DeadAlien CircleOn CrosshairOn,off=Alien CircleOff Circle CrosshairOff Crosshair}\shoot}%
\hidden[ShotDone]
  \position{control}
           [\dimexpr(\pdfpagewidth/2)+8em,1cm]
           {\shot}
%
% The dead alien.
\hidden[DeadAlien]
  \position{main}
           [12.4cm,2cm]
           \deadalien
\endslide


\bye</pre></body></html>