<area shape="rect" href="$a00656.html" title="Superclass for algorithms that produce only graph as output." alt="" coords="31,229,167,256"> <area shape="rect" href="$a00101.html" title="Superclass for all sources, filters, and sinks in VTK." alt="" coords="49,155,148,181"> <area shape="rect" href="$a01084.html" title="abstract base class for most VTK objects" alt="" coords="59,80,139,107"> <area shape="rect" href="$a01085.html" title="abstract base class for most VTK objects" alt="" coords="44,5,153,32">