\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-6,-5)(6,5) % class 19
%%%---lemniscate
\psFourBarLinkage[unit=2,barlengths=10 14 10 14,crossed,connectedpoints,centrodes,N=\i,fixedcentrodes,dmax=3.85,posM=-1 0] % classe 19
\end{pspicture}}
\end{document}