d it is necessary to do so. It is necessary to do so,
 if the user selects/deselects edge concentration or topdown/bottomup
 options.
 <p> The layout is performed in a separate thread and the progress
 bar of the class is updated for each of the steps as the process
 continues.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../weka/gui/graphvisualizer/LayoutEngine.html#layoutGraph()">layoutGraph</a></code>&nbsp;in interface&nbsp;<code><a href="../../../weka/gui/graphvisualizer/L