\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-10,-8)(11,12) % class 9
\psFourBarLinkage[unit=2,barlengths=12 14 10 11,crossed,N=\i,connectedpoints,centrodes,fixedcentrodes,dmax=5] % classe 9
\end{pspicture}}
\end{document}