m_vis.setInteractive(EDGES, null, false);
m_vis.setValue(NODES, null, VisualItem.SHAPE,
new Integer(Constants.SHAPE_ELLIPSE));
AggregateTable at = m_vis.addAggregates(AGGR);
at.addColumn(VisualItem.POLYGON, float[].class);
at.addColumn("id", int.class);
// add nodes to aggregates
// create an aggregate for each 3-clique of nodes
Iterator nodes = vg.nodes();