Returns the bounding box for an array of cells or null, if no cells are
 specified.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cells</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns the bounding box for the given cells.</dd>
</dl>
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<h4>getBounds</h4>
<pre class="methodSignature">public&nbsp;<a href="../util/mxRectangle.html" title