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<h4>layoutGraph</h4>
<pre>public&nbsp;void&nbsp;layoutGraph()</pre>
<div class="block">This method does a complete layout of the graph which includes
 removing cycles, assigning levels to nodes, reducing edge crossings
 and laying out the vertices horizontally for better visibility.
 The removing of cycles and assignment of levels is only performed
 if hasn't been performed earlier or if some layout option has been
 changed an