/*

:Title: Snaked edges
:Tags: PGF

This graph uses special `PGF/TikZ`_ styles to create some interesting
visual effects. To get the snaked edges run dot2tex with the ``-s`` option
to force straight edges. 

Generated with::

    $ dot2tex -s --prog fdp balls.dot > balls.tex

.. _PGF/TikZ: http://www.ctan.org/tex-archive/help/Catalogue/entries/pgf.html    
*/
graph G {
	node [shape=circle, fixedsize=True, width="0.2", style="ball color = green", label=""];
	edge [style="snake=zigzag, green"];
	a_1 -- c -- a_2;
	c [style="ball color=black"];
	edge [style="snake=snake, blue", color=red];
	node [style="ball color = red", label=""];
	a_3 -- c -- a_4 --a_3;
}