\documentclass[pstricks]{standalone}

\usepackage{pst-fourbarlinkage,multido}


\begin{document}
\multido{\i=0+10}{37}{
\begin{pspicture}(-4,-7)(8,6) % class 1
\psFourBarLinkage[unit=1.5,crossed,N=\i,connectedpoints,centrodes,fixedcentrodes] % classe 1 % 20 32 30 15
\end{pspicture}}
\end{document}