%% Ein Beispiel der DANTE-Edition

%%
%% Ein Beispiel der DANTE-Edition
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%% 1. Auflage
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%% Beispiel 15-04-18 auf Seite 800.
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%% 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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{118.324pt}
\usepackage[T1]{fontenc}
\StartShownPreambleCommands
\usepackage{tikz}
\StopShownPreambleCommands
\begin{document}
\begin{tikzpicture}[shading=ball]
\foreach \x/\colA in {0/red,1/green,2/blue,3/yellow}
\foreach \y/\colB in {0/red,1/green,2/blue,3/yellow}{%
\shade[ball color=\colA!50!\colB] (\x,\y) circle (0.4cm);
\ifnum \x<\y\relax \breakforeach\fi}
\end{tikzpicture}
\end{document}