\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-8,-8)(10,13) % class 7
\psFourBarLinkage[unit=2,barlengths=18 14 8 11,crossed=false,N=\i,centrodes,connectedpoints,fixedcentrodes,dmax=5,posM=0 2] % classe 7
\end{pspicture}}
\end{document}