[pstricks] Questions about pst-node

[Martin Chicoine]

Hi all,

I use pst-node to draw the following diagram. I have some questions:

1) Why is the "Wide Gray Common Box 1" not well centered on the central
arrow?

2) Is there a way to draw the top and bottom horizontal arrows without
having to specify the 2cm offsets?

3) Is there a better way to draw the gray frame?

Thanks!

**************************************************

\documentclass{article}
\usepackage{pst-node}

\begin{document}

\psset{arrowscale=2}
\newcommand{\cadre}[1]{\fcolorbox{black}{cyan}{\parbox{6cm}{\centering #1}}}

\rput(3.15,0){\psframe[fillstyle=solid,fillcolor=lightgray](-3.5,1.1)(3.5,8.
8)}
\psmatrix[colsep=1.5cm,rowsep=1cm]
  \parbox{6cm}{\centering Title} & \\
  \cadre{Box 1\\ (B1)} & \\
  \cadre{Box 2\\ (B2)} &
    \rput[b]{-90}{\colorbox{lightgray}{Wide Gray Common Box 1}} \\
  \cadre{Box 3\\ (B3)} & \\
  \cadre{Box 4\\ (B4)} & \\
\endpsmatrix

\ncline{->}{2,1}{3,1}
\ncline{->}{3,1}{4,1}
\ncline{->}{4,1}{5,1}
\ncline{<-}{3,1}{3,2}
\ncangle[offsetB=2cm,armB=0,angleB=180]{<-}{2,1}{3,2}
\ncangle[offsetB=-2cm,armB=0,angleB=180]{<-}{4,1}{3,2}

\end{document}