\documentclass[12pt,a4paper]{article}
\usepackage[francais]{babel}
\usepackage{mafr}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}
\usepackage{pstricks}
\begin{document}
{\psset{unit=0.5cm}%
\begin{pspicture}(0,0)(4,4)%
\psgrid[gridcolor=lightgray,gridlabelcolor=lightgray,%
		subgriddiv=1,gridlabels=6pt,gridwidth=.2pt]%
	   (0,0)(4,4)%
\psframe(0,0)(3,2)%
\psline(0,2)(1.5,3)(3,2)%
\psellipse(1.5,1)(1.5,1)%
\end{pspicture}%
}
\end{document}
