\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-3,-5)(6,5) % class 6
\psFourBarLinkage[unit=2,barlengths=14 14 14 15,crossed,N=\i,connectedpoints=false] % classe 6
\end{pspicture}}
\end{document}