%%
%% A DANTE-Edition example
%%
%% Example 02-01-16 on page 21.
%%
%% 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{201.70511pt}
\setlength\parindent{0pt}
\usepackage{pstricks}
\newcount\WL \unitlength.75pt
\def\WaveToPS#1{%
\definecolor{tmp}{wave}{#1}\extractcolorspec{tmp}\tmp
\expandafter\convertcolorspec\tmp{rgb}\tmp \expandafter\WaveToPSi\tmp,}
\def\WaveToPSi#1,#2,#3,{\pstVerb{/Red {#1} def /Green {#2} def /Blue {#3} def}}
%
\pstVerb{/Corr {dup 0 gt {Gamma exp} if } def }
\definecolor[ps]{lambda}{rgb}{Red Corr Green Corr Blue Corr}
\begin{document}
\begin{picture}(510,70)(310,-10)\sffamily\tiny
\linethickness{1.25\unitlength}\WL=360
\pstVerb{/Gamma .8 def}\multiput(320,0)(1,0){456}{%
\WaveToPS{\the\WL}{\color{lambda}\line(0,1){50}}\global\advance\WL1}%
\linethickness{0.25\unitlength}\WL=360
\multiput(320,0)(20,0){23}{%
\picture(0,0)
\line(0,-1){5}\multiput(5,0)(5,0){3}{\line(0,-1){2.5}}%
\put(0,-10){\makebox(0,0){\the\WL}}\global\advance\WL20
\endpicture}%
\end{picture}
\end{document}
