%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-11-4 on page 268.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](-1,-1)(3,4)
  \uput{0.5}[180]{90}(0,1.5){ordinate}
  \uput*{0.5}[-90](1.5,0){abscissa}
  \psline(3,4)
  \uput*{0}[180]{52}(1.5,2){\fbox{center}}
  \qdisk(1.5,2){2pt}
  \qdisk(1,3){2pt}\uput[45](1,3){\small $(1,2)$}
  \qdisk(2,2){2pt}\uput*[45](2,2){\small $(2,1)$}
\end{pspicture}
\end{document}