\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-8,-8)(10,13) %
\psFourBarLinkage[unit=2,barlengths=10 16 7.5 15,crossed,N=\i,centrodes,fixedcentrodes,connectedpoints,dmax=5,posM=0.5 2] % classe 4
\end{pspicture}}
\end{document}