private void initDataGroups() {
// create sample graph
// 9 nodes broken up into 3 interconnected cliques
Graph g = new Graph();
for (int i = 0; i < 3; ++i) {
Node n1 = g.addNode();
Node n2 = g.addNode();
Node n3 = g.addNode();
g.addEdge(n1, n2);
g.addEdge(n1, n3);
g.addEdge(n2, n3);
}
g.addEdge(0, 3);
g.addEdge(3, 6);
g.addEdge(6, 0);
// add visual data groups
VisualGraph vg = m_vis.addGraph(GRAPH, g);
m_vis.setInteractive(EDGES, null, false);
m_vis.setValue(NODES, null, VisualItem.SHAPE, new Integer(Constants.SHAPE_ELLIPSE));
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();
for (int i = 0; i < 3; ++i) {
AggregateItem aitem = (AggregateItem) at.addItem();
aitem.setInt("id", i);
for (int j = 0; j < 3; ++j) {
aitem.addItem((VisualItem) nodes.next());
}
}
}
/**
* @see edu.berkeley.guir.prefuse.action.Action#run(edu.berkeley.guir.prefuse.ItemRegistry,
* double)
*/
public void run(double frac) {
AggregateTable aggr = (AggregateTable) m_vis.getGroup(m_group);
// do we have any to process?
int num = aggr.getTupleCount();
if (num == 0) return;
// update buffers
int maxsz = 0;
for (Iterator aggrs = aggr.tuples(); aggrs.hasNext(); )
maxsz = Math.max(maxsz, 4 * 2 * ((AggregateItem) aggrs.next()).getAggregateSize());
if (m_pts == null || maxsz > m_pts.length) {
m_pts = new double[maxsz];
}
// compute and assign convex hull for each aggregate
Iterator aggrs = m_vis.visibleItems(m_group);
while (aggrs.hasNext()) {
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;
}
}
// if no aggregates are visible, do nothing
if (idx == 0) continue;
// compute convex hull
double[] nhull = GraphicsLib.convexHull(m_pts, idx);
// prepare viz attribute array
float[] fhull = (float[]) aitem.get(VisualItem.POLYGON);
if (fhull == null || fhull.length < nhull.length) fhull = new float[nhull.length];
else if (fhull.length > nhull.length) fhull[nhull.length] = Float.NaN;
// copy hull values
for (int j = 0; j < nhull.length; j++) fhull[j] = (float) nhull[j];
aitem.set(VisualItem.POLYGON, fhull);
aitem.setValidated(false); // force invalidation
}
}