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+%% talk -- (talk.cls) Class file
+%% A LaTeX class for creating presentations
+%% Author: Martin Wiebusch
+%%
+%% This file may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%% The latest version of this license is in
+%%    http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of LaTeX
+%% version 2003/12/01 or later.
+
+
+\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+\ProvidesClass{talk}[2005/08/09 v1.0.1]
+
+\def\pres@dt@notes{notes}
+\def\pres@dt@slides{slides}
+\def\pres@dt@screen{screen}
+\def\pres@doctype{}
+\newif\if@pres@rotate
+
+\def\@ifnotes#1#2{\ifx\pres@doctype\pres@dt@notes#1\else#2\fi}
+\def\@ifslides#1#2{\ifx\pres@doctype\pres@dt@slides#1\else#2\fi}
+\def\@ifscreen#1#2{\ifx\pres@doctype\pres@dt@screen#1\else#2\fi}
+
+\DeclareOption{notes}{\global\let\pres@doctype\pres@dt@notes}
+\DeclareOption{slides}{\global\let\pres@doctype\pres@dt@slides}
+\DeclareOption{screen}{\global\let\pres@doctype\pres@dt@screen}
+\DeclareOption{rotate}{\@pres@rotatetrue}
+\DeclareOption{norotate}{\@pres@rotatefalse}
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
+
+\ExecuteOptions{screen,rotate}
+\ProcessOptions\relax
+
+\LoadClass{article}
+
+\RequirePackage{multido}
+\RequirePackage{amsmath}
+\RequirePackage{graphicx}
+\RequirePackage{pgf}
+%\RequirePackage{hyperref}
+
+% collect@body (from amsmath.sty)
+%
+\long\def\pres@addto@envbody#1{\global\@envbody\@xp{\the\@envbody#1}}
+\long\def\pres@collect@body#1{%
+  \@envbody{\@xp#1\@xp{\the\@envbody}}%
+  \edef\process@envbody{\the\@envbody\@nx\end{\@currenvir}}%
+  \@envbody\@emptytoks \def\begin@stack{b}%
+  \begingroup
+  \@xp\let\csname\@currenvir\endcsname\pres@collect@@body
+  \edef\process@envbody{\@xp\@nx\csname\@currenvir\endcsname}%
+  \process@envbody
+}
+\long\def\pres@push@begins#1\begin#2{%
+  \ifx\end#2\else b\@xp\pres@push@begins\fi
+}
+\long\def\pres@collect@@body#1\end#2{%
+  \edef\begin@stack{\pres@push@begins#1\begin\end \@xp\@gobble\begin@stack}%
+  \ifx\@empty\begin@stack
+    \endgroup
+    \@checkend{#2}%
+    \pres@addto@envbody{#1}%
+  \else
+    \pres@addto@envbody{#1\end{#2}}%
+  \fi
+  \process@envbody % A little tricky! Note the grouping
+}
+
+
+% some definitions
+%
+\newlength{\slidewidth}
+\newlength{\slideheight}
+\def\pres@currentslidestyle{}
+\def\pres@oldslidestyle{}
+\def\@slidetitle{}
+\def\@slidebody{}
+\long\def\pres@defslidebody#1{\long\gdef\@slidebody{#1}}
+\def\pres@slidesmag{1}
+
+
+% section and subsection handling
+%
+\long\def\@tableofcontents{}
+\newcommand{\pres@artsection}[2][]{}
+\newcommand{\pres@artsubsection}[2][]{}
+\@ifnotes{%
+  \let\pres@artsection\section
+  \let\pres@artsubsection\subsection
+}{}
+\def\pres@addtocsection#1#2#3{%
+  \expandafter\gdef\expandafter\@tableofcontents\expandafter{\@tableofcontents\@maketocsection{#1}{#2}{#3}}%
+}
+\def\pres@addtocsubsection#1#2#3#4{%
+  \expandafter\gdef\expandafter\@tableofcontents\expandafter{\@tableofcontents\@maketocsubsection{#1}{#2}{#3}{#4}}%
+}
+\def\section{\@ifnextchar[{\@@pres@section}{\@pres@section}}
+\def\@pres@section#1{\@@pres@section[#1]{#1}}
+\def\@@pres@section[#1]#2{%
+  \pres@artsection[#1]{#2}
+  \@ifnotes{}{\refstepcounter{section}}
+  \addtocontents{ttc}{\string\pres@addtocsection{\the\c@section}{#1}{#2}}
+}
+\def\subsection{\@ifnextchar[{\@@pres@subsection}{\@pres@subsection}}
+\def\@pres@subsection#1{\@@pres@subsection[#1]{#1}}
+\def\@@pres@subsection[#1]#2{%
+  \pres@artsubsection[#1]{#2}
+  \@ifnotes{}{\refstepcounter{subsection}}
+  \addtocontents{ttc}{\string\pres@addtocsubsection{\the\c@section}{\the\c@subsection}{#1}{#2}}
+}
+\long\def\@ifcurrentsection#1#2#3{\ifnum\c@section=#1 #2\else#3\fi}
+\long\def\@ifcurrentsubsection#1#2#3{\ifnum\c@subsection=#1 #2\else#3\fi}
+\@input{\jobname.ttc}%
+\newwrite\tf@ttc
+\immediate\openout\tf@ttc\jobname.ttc\relax
+\newwrite\tf@toc
+\immediate\openout\tf@toc\jobname.toc\relax
+
+
+% table of contents
+%
+\long\def\maketitle{}
+\long\def\tableofcontents{}
+\long\def\pres@ifinrange#1#2[#3.#4-#5.#6]#7#8{%
+  \ifnum#1=#3
+    \ifnum#2<#4 #8\else #7\fi
+  \else
+    \ifnum#1=#5
+      \ifnum#2>#6 #8\else #7\fi
+    \else
+      \ifnum#1<#3 #8\else
+        \ifnum#1>#5 #8\else #7\fi
+      \fi
+    \fi
+  \fi
+}
+\long\def\@ifinrange#1#2#3#4#5{\pres@ifinrange{#1}{#2}[#3]{#4}{#5}}
+
+
+% default make commands
+%
+\long\def\pres@defaultslide{%
+  \vspace*{1.2em minus 0.4em}%
+  \centerline{\LARGE\@slidetitle}%
+  \vspace*{1.8em minus 0.6em}%
+  \@slidebody%
+  \vfill%
+  \raggedleft\tiny\@title\ -- \theslidelabel%
+}
+\def\pres@defaultslidebackground{%
+  \pgfsetlinewidth{0.8pt}
+  \color{black}
+  \pgfrect[stroke]{\pgfpoint\z@\z@}{\pgfpoint\slidewidth\slideheight}
+}
+\def\pres@restoredefaults{%
+  \gdef\@makeslidecontent{\pres@defaultslide}
+  \gdef\@makeslidebackground{\pres@defaultslidebackground}
+  \gdef\@makeslide{%
+    \begin{pgfpicture}\z@\z@\z@\z@%
+      \@makeslidebackground%
+    \end{pgfpicture}%
+    \begin{minipage}[b][\slideheight][t]{\slidewidth}%
+      \@makeslidecontent%
+    \end{minipage}%
+  }
+  \gdef\@makenotesslide{\par\hspace*{\fill}\@makeslide\hspace*{\fill}\par}
+  \gdef\@maketocsection##1##2##3{}
+  \gdef\@maketocsubsection##1##2##3##4{}
+}
+\pres@restoredefaults
+
+
+% the slide environment
+%
+\@ifnotes{\def\pres@makeslide{\noindent\@makenotesslide}}{}
+\@ifslides{%
+  \def\pres@makeslide{%
+    \vspace*{\fill}%
+    \noindent%
+    \hspace*{\fill}%
+    \scalebox{\pres@slidesmag}{%
+      \if@pres@rotate%
+        \rotatebox[origin=c]{90}{\@makeslide}%
+      \else%
+        \@makeslide%
+      \fi%
+    }%
+    \hspace*{\fill}%
+    \vspace*{\fill}%
+    \newpage%
+  }%
+}{}
+\@ifscreen{\def\pres@makeslide{\noindent\@makeslide\newpage}}{}
+
+\def\slide{\@ifnextchar[{\@@slide}{\@slide}}
+\long\def\@@slide[#1]#2{%
+  \refstepcounter{slide}
+  \csname pres@sty@#1\endcsname%
+  \long\global\def\@slidetitle{#2}
+  \pres@collect@body\pres@defslidebody%
+}
+\long\def\@slide#1{%
+  \refstepcounter{slide}
+  \csname pres@sty@\pres@currentslidestyle\endcsname
+  \long\global\def\@slidetitle{#1}
+  \pres@collect@body\pres@defslidebody%
+}
+\def\endslide{%
+  \global\@ignoretrue%
+  \pres@makeslide%
+}
+
+
+% slide styles
+%
+\long\def\@newslidestyle#1#2{%
+  \edef\@temp{#1}%
+  \expandafter\gdef\csname pres@sty@\@temp\endcsname{%
+    \pres@restoredefaults%
+    #2%
+  }%
+}
+\newcommand{\slidestyle}[1]{\gdef\pres@currentslidestyle{#1}}
+
+
+% slide and subslide numbering
+%
+\newcounter{slide}
+\newcounter{subslide}
+\def\theslide{\arabic{slide}}
+\def\thesubslide{\theslide.\arabic{subslide}}
+\def\theslidelabel{\theslide}
+
+% overlay commands
+%
+\@ifnotes{
+  \long\gdef\fromslide{\@ifnextchar*{\@fromslidestar}{\@fromslide}}
+  \long\gdef\@fromslide#1#2{#2}
+  \long\gdef\@fromslidestar*#1#2{#2}
+  \long\gdef\toslide{\@ifnextchar*{\@toslidestar}{\@toslide}}
+  \long\gdef\@toslide#1#2{#2}
+  \long\gdef\@toslidestar*#1#2{#2}
+  \long\gdef\onlyslide{\@ifnextchar*{\@onlyslidestar}{\@onlyslide}}
+  \long\gdef\@onlyslide#1#2{#2}
+  \long\gdef\@onlyslidestar*#1#2{#2}
+  \gdef\pres@makemultislide{\pres@makeslide}
+}{%
+  \long\gdef\fromslide{\@ifnextchar*{\@fromslidestar}{\@fromslide}}
+  \long\gdef\@fromslide#1#2{%
+    \ifnum\c@subslide<#1%
+      \pgfsys@begininvisible#2\pgfsys@endinvisible%
+    \else%
+      #2%
+    \fi%
+  }
+  \long\gdef\@fromslidestar*#1#2{%
+    \ifnum\c@subslide<#1%
+    \else%
+      #2%
+    \fi%
+  }
+  \long\gdef\toslide{\@ifnextchar*{\@toslidestar}{\@toslide}}
+  \long\gdef\@toslide#1#2{%
+    \ifnum\c@subslide>#1%
+      \pgfsys@begininvisible#2\pgfsys@endinvisible%
+    \else%
+      #2%
+    \fi%
+  }
+  \long\gdef\@toslidestar*#1#2{%
+    \ifnum\c@subslide>#1\relax%
+    \else%
+      #2%
+    \fi%
+  }
+  \long\gdef\onlyslide{\@ifnextchar*{\@onlyslidestar}{\@onlyslide}}
+  \long\gdef\@onlyslide#1#2{%
+    \ifnum\c@subslide=#1\relax%
+      #2%
+    \else%
+      \pgfsys@begininvisible#2\pgfsys@endinvisible%
+    \fi%
+  }
+  \long\gdef\@onlyslidestar*#1#2{%
+    \ifnum\c@subslide=#1\relax%
+      #2%
+    \fi%
+  }
+}
+\@ifslides{%
+  \def\pres@makemultislide{%
+    \setcounter{subslide}{0}%
+    \def\theslidelabel{\thesubslide}
+    \multido{}{\pres@msmax}{%
+      \refstepcounter{subslide}%
+      \vspace*{\fill}%
+      \noindent%
+      \hspace*{\fill}%
+      \scalebox{\pres@slidesmag}{%
+        \if@pres@rotate%
+          \rotatebox[origin=c]{90}{\@makeslide}%
+        \else%
+          \@makeslide%
+        \fi%
+      }%
+      \hspace*{\fill}%
+      \vspace*{\fill}%
+      \newpage%
+    }%
+  }%
+}{}
+\@ifscreen{%
+  \def\pres@makemultislide{%
+    \setcounter{subslide}{0}%
+    \def\theslidelabel{\thesubslide}
+    \multido{}{\pres@msmax}{%
+      \refstepcounter{subslide}
+      \noindent%
+      \@makeslide%
+      \newpage%
+    }%
+  }%
+}{}
+\def\multislide{\@ifnextchar[{\@@multislide}{\@multislide}}
+\long\def\@@multislide[#1]#2#3{%
+  \refstepcounter{slide}
+  \csname pres@sty@#1\endcsname
+  \long\global\def\@slidetitle{#3}%
+  \global\def\pres@msmax{#2}%
+  \pres@collect@body\pres@defslidebody%
+}
+\long\def\@multislide#1#2{%
+  \refstepcounter{slide}%
+  \csname pres@sty@\pres@currentslidestyle\endcsname
+  \long\global\def\@slidetitle{#2}%
+  \global\def\pres@msmax{#1}%
+  \pres@collect@body\pres@defslidebody%
+}
+\def\endmultislide{%
+  \global\@ignoretrue%
+  \pres@makemultislide%
+}
+
+
+% notes
+%
+\newcommand{\pres@notes}[1]{\@ifnotes{#1}{}}
+\newenvironment{notes}{\pres@collect@body\pres@notes}{\global\@ignoretrue}
+
+
+% size settings
+%
+\AtBeginDocument{%
+  \AtBeginDvi{\special{papersize=\the\paperwidth,\the\paperheight}}%
+}
+\def\pres@removemargins{%
+  \setlength\oddsidemargin{-1in}%
+  \setlength\evensidemargin{-1in}%
+  \setlength\topmargin{-1in}%
+  \setlength\headheight\z@%
+  \setlength\headsep\z@%
+  \setlength\topskip\z@%
+  \setlength\footskip\z@%
+  \setlength\textwidth\paperwidth%
+  \setlength\textheight\paperheight%
+}
+\def\@slidesize#1#2{
+  \setlength\slidewidth{#1}
+  \setlength\slideheight{#2}
+  \@ifscreen{%
+    \setlength\paperwidth\slidewidth%
+    \setlength\paperheight\slideheight%
+    \pres@removemargins%
+  }{}%
+  \@ifslides{\pres@removemargins}{}%
+}
+\def\slidesmag#1{\gdef\pres@slidesmag{#1}}
+
+\@slidesize{4in}{3in}
+\@ifnotes{}{\pagestyle{empty}}
+
+
+% footnote style
+%
+\def\thempfootnote{\@arabic\c@mpfootnote}
+\let\thanks\footnote
+