\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+5}{73}{
\begin{pspicture}(-8,-8)(10,13) % class 3
\psFourBarLinkage[unit=2,barlengths=16 7.5 15 10,crossed,N=\i,connectedpoints,centrodes,fixedcentrodes,dmax=5,posM=0.5 2] % classe 3
\end{pspicture}}
\end{document}