\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+5}{73}{
\begin{pspicture}(-8,-10)(10,10) % class 5
\psFourBarLinkage[unit=2,barlengths=8 12 10 15,crossed,N=\i,connectedpoints,centrodes,fixedcentrodes,dmax=8,posM=0.5 1] % classe 5
\end{pspicture}}
\end{document}