%% 
%%  Ein DANTE-Edition Beispiel
%% 
%%  Beispiel 04-14-1 auf Seite 106.
%% 
%%  Copyright (C) 2010 Voss
%% 
%%  It 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.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

% Show page(s) 1,2,3

\PassOptionsToClass{}{beamer}
\documentclass{beamer}
\setlength\unitlength{1mm}


\usetheme{Hannover}


\begin{document}
\begin{frame}{Mehrspaltensatz}{\texttt{columns}, \texttt{column}, \ldots}
\begin{columns}[b] % bottom aligned
 \only<1->{%			ab Overlay 1
  \begin{column}{.4\textwidth}
     \TeX\ is the world's premi\`ere markup-based typesetting system,
      and PostScript is the leading language for describing the printed
      page. We describe how they can produce even more beautiful results
      when they work together.
  \end{column}}
  \begin{column}{.2\textwidth}
   \only<2->{\rule{20mm}{25mm}% ab Overlay 2
   \put(-13,20){{\color{white}\TeX}}}
  \end{column}
  \only<3>{%			nur Overlay 3
   \begin{column}{.2\textwidth}{\color{red}\rule{20mm}{40mm}}
       \put(-13,20){\LaTeX}
   \end{column}}
\end{columns}
\end{frame}
\end{document}
