%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 5-10-10 on page 264.
%% 
%%  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{87.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks}
\makeatletter  % C4=196 and  C5=197
\newpsfontdot{CircleMultiply}[2 0.0 0.0 2 -0.78 -0.7]{Symbol}{<C4>}
\newpsfontdot{CirclePlus}[2 0.0 0.0 2 -0.78 -0.7]{Symbol}{<C5>}
\@namedef{psas@cm}{\psk@dotsize \psds@CircleMultiply 0 0 Dot}
\@namedef{psas@cp}{\psk@dotsize \@nameuse{psds@CirclePlus} 0 0 Dot}
\makeatother
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}(3,2)
  \psline[arrowscale=2]{cm-cm}(0,2)(2,2)
  \psline[arrowscale=4,linecolor=red]{cm-cp}(0,1)(2,1)
  \psline[arrowscale=3,linecolor=blue]{cm->}(2,0)
\end{pspicture}
\end{document}