\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-9,-8)(11,12) % class 8
\psFourBarLinkage[unit=1.8,barlengths=10 14 12 11,crossed=false,N=\i,connectedpoints,centrodes,fixedcentrodes,dmax=10] % classe 8
\end{pspicture}}
\end{document}