%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 Herbert 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
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\definecolor{lightred}{rgb}{1.0, 0.8, 0.8}
\newsavebox\pstBox
\newlength\pstWidth
\newlength\pstHeight
\makeatletter
\def\psLBox{\@ifnextchar[{\psLBox@i}{\psLBox[]}}
\def\psLBox@i[#1]#2{%
  \psset{linearc=0.4,shadow=true,shadowsize=0.2,%
      fillstyle=solid,fillcolor=white}
  \ifx#1\empty\else\psset{#1}\fi
  \sbox\pstBox{#2}
  \pstWidth=\wd\pstBox
  \pstHeight=\ht\pstBox
  \advance\pstHeight by \dp\pstBox
  \advance\pstHeight by \pslinearc
  \advance\pstWidth by \pslinearc
  \begin{pspicture}(\pstWidth,\pstHeight)
    \psline(\pstWidth,0)(0,0)(0,\pstHeight)(\pstWidth,\pstHeight)%
    \psline[shadow=false](\pstWidth,\pstHeight)(\pstWidth,0)
    \rput(0.5\pstWidth,0.5\pstHeight){#2}
  \end{pspicture}
}
\makeatother

\StopShownPreambleCommands
\begin{document}
\psLBox[fillcolor=lightred]{Some text in a box}%
\psLBox[fillcolor=yellow]{%
  \parbox{3cm}{Some text in a box with line arcs only on the left side}%
}
\end{document}