%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-7-20 on page 249.
%% 
%%  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{111.83385pt}
%
\AtBeginDocument{\newcommand\PlotLines{%
  \rput[lC]{-105.7}(2,2.5){%
     \psset{linewidth=0.2pt,linecolor=red,linestyle=dashed}
     \psline(0,-1)(0,1) \psline(0,0)(1.5,0)
     \psarc[linestyle=solid](0,0){0.25}{0}{90}}
  \rput[lC]{-90}(2,2.5){\psset{linecolor=green}
     \psline(0,-1)(0,1) \psline(0,0)(1.5,0)
     \psarc(0,0){0.25}{0}{90}}}}
\StartShownPreambleCommands
\usepackage{pstricks}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
  \pscurve[showpoints=true,linecolor=red,
     linestyle=dashed](0,0)(2,2.5)(3,0)
  \pscurve[linecolor=green,curvature=1 0.1 -1](0,0)(2,2.5)(3,0)
  \pscurve[linecolor=blue,curvature=1 0.1  2](0,0)(2,2.5)(3,0)
  \PlotLines  % defined in preamble
  \uput[0](0,0){A}\uput[180](3,0){B}\uput[90](2,2.5){C}
\end{pspicture}
\end{document}