\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-8,-8)(10,10) % class 12
\psFourBarLinkage[unit=2,barlengths=10 14 12 16,crossed=false,N=\i,connectedpoints,centrodes,fixedcentrodes,dmax=5] % classe 12
\end{pspicture}}
\end{document}