%% 
%%  A DANTE-Edition example
%% 
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-node,graphicx}
\definecolor{Pink}{rgb}{1.,0.75,0.8}
\newsavebox\PBox

\begin{document}
\psset{linearc=0} % it makes a round corner of connection link

\savebox\PBox{%
\begin{psmatrix}[rowsep=1cm,colsep=.5cm]
& \psshadowbox[linearc=5mm,fillstyle=solid,fillcolor=Pink]
   { \begin{tabular}{c}
   $ f1  = a \, q_1 + b \, q_2 $ \\
   $ f2  = c \, q_1 + d \, q_2 $ \\
   \end{tabular} }  &   \\% end of 1st row
\psshadowbox[linearc=5mm,shadow=true,fillstyle=solid,fillcolor=Pink]{
\begin{tabular}{c}
$L_1 = t (q_1+ q_2)\dot{q}_1 - \dot{q}_2 + \frac{dg}{dt}  $ \\
when $a=0, b=1, c=2, d=1$
\end{tabular}
}
& &
\psshadowbox[linearc=5mm,shadow=true,fillstyle=solid,fillcolor=Pink]{
\begin{tabular}{c}
$L_1 = t (q_1+ q_2)\dot{q}_1 - \dot{q}_2 + \frac{dg}{dt}  $ \\
when $a=0, b=1, c=2, d=1$
\end{tabular}
} \\
\psshadowbox[linearc=5mm,shadow=true,fillstyle=solid,fillcolor=Pink]{
\begin{tabular}{c}
$L_1 = t (q_1+ q_2)\dot{q}_1 - \dot{q}_2 + \frac{dg}{dt}  $ \\
when $a=0, b=1, c=2, d=1$
\end{tabular}
}
& &
\psshadowbox[linearc=5mm,shadow=true,fillstyle=solid,fillcolor=Pink]{
\begin{tabular}{c}
$L_1 = t (q_1+ q_2)\dot{q}_1 - \dot{q}_2 + \frac{dg}{dt}  $ \\
when $a=0, b=1, c=2, d=1$
\end{tabular}
} \\
\psshadowbox[linearc=5mm,shadow=true,fillstyle=solid,fillcolor=Pink]{
\begin{tabular}{c}
$L_1 = t (q_1+ q_2)\dot{q}_1 - \dot{q}_2 + \frac{dg}{dt}  $ \\
when $a=0, b=1, c=2, d=1$
\end{tabular}
}
& &
\psshadowbox[linearc=5mm,shadow=true,fillstyle=solid,fillcolor=Pink]{
\begin{tabular}{c}
$L_1 = t (q_1+ q_2)\dot{q}_1 - \dot{q}_2 + \frac{dg}{dt}  $ \\
when $a=0, b=1, c=2, d=1$
\end{tabular}
}
\end{psmatrix}}%
\rput[lt](0,0){\usebox\PBox}%
{\psset{linewidth=1.5pt,arrowsize=7pt,angleA=-90,angleB=90,arm=0}%
\ncdiag{->}{1,2}{4,1}%
\ncdiag{->}{1,2}{4,3}%
%
\ncdiag{->}{1,2}{3,1}%
\ncdiag{->}{1,2}{3,3}%
%
\ncdiag{->}{1,2}{2,1}%
\ncdiag{->}{1,2}{2,3}}%
%
\rput[lt](0,0){\usebox\PBox}% again to put the boxes over the arrows
\end{document}
