%% 
%%  A DANTE-Edition example
%% 
%%  Example 20-03-2 on page 311.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-coil,pst-node}
\SpecialCoor

\begin{document}
\begin{pspicture}(4,3)
\cnode*(0.5,0.5){0.5}{A}\cnode*(3.5,2.5){0.5}{B}
\pccoil[coilwidth=0.4,coilaspect=35,
  coilheight=0.5,linecolor=white]{<->}(A)(B)
\nccoil[coilwidth=0.4,coilaspect=35,
  coilheight=0.5]{A}{B}
\end{pspicture}
\end{document}