\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-9,-8)(12,8) % class 17
\psFourBarLinkage[unit=1.4,barlengths=14 10 10 14,N=\i,connectedpoints=false,centrodes,fixedcentrodes] % classe 17
\end{pspicture}}
\end{document}