s and edges, the initial width
 and height of a node, and a boolean value to indicate if the edges
 should be concentrated.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>nodes</code> - - FastVector containing all the nodes</dd><dd><code>edges</code> - - FastVector containing all the edges</dd><dd><code>nodeWidth</code> - - A node's allowed width</dd><dd><code>nodeHeight</code> - - A node's allowed height</dd><dd><code>edgeConcentration</code> - - True: if want to concentrate edges,
 Fa