\begin{center}
\setlength{\unitlength}{1cm}
\referencesystem(0,0)(1,-1)(1,1)
\begin{Picture}(-2.5,-2.5)(2.5,2.5)
\cartesiangrid(-2,-2)(2,2)
\pictcolor{blue}
\multiPut(-2,-2)(1,1){5}{\circle*{0.25}}
\pictcolor{red}
\multiPlot{\circle*{0.25}}(-1,-2)(2,1)(-2,2)
\end{Picture}
\end{center}
