\documentclass{article}
\usepackage{pstricks}
\usepackage{pst-3d}

\parindent=0pt
\pagestyle{empty}
\begin{document}

\begin{center}
\begin{pspicture}(-0.5,-0.5)(4.25,4.25)
\psgrid[subgriddiv=0,griddots=5,gridlabels=7pt]
\psline{->}(4,0)\psline{->}(0,4)
\psline[linewidth=3pt,linecolor=red](0,0.5)(3,4)
\end{pspicture}
\hspace{1cm}
\begin{pspicture}(-0.5,-0.5)(4.25,4.25)
\pstilt{45}{%
\psgrid[subgriddiv=0,griddots=5,gridlabels=7pt]
\psline{->}(4,0)\psline{->}(0,4)
\psline[linewidth=3pt,linecolor=red](0,0.5)(3,4)
}
\psline[linewidth=0.5pt,linestyle=dashed](0,0)(0,4)
\psarc{->}(0,0){2}{45}{90}\rput(0.5,1.5){\large$\alpha$}
\end{pspicture}
\end{center}

\end{document}
