AggregateItem aitem = (AggregateItem)aggrs.next();
int idx = 0;
if ( aitem.getAggregateSize() == 0 ) continue;
VisualItem item = null;
Iterator iter = aitem.items();
while ( iter.hasNext() ) {
item = (VisualItem)iter.next();
if ( item.isVisible() ) {
addPoint(m_pts, idx, item, m_margin);
idx += 2*4;