\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{73}{
\begin{pspicture}(-10,-10)(10,10) % class 15
\psFourBarLinkage[unit=1.5,barlengths=10 16 16 10,crossed,N=\i,Nmax=720,connectedpoints,centrodes,fixedcentrodes,posM=0 2] % classe 15
\end{pspicture}}
\end{document} 