org.graphstream.ui.layout.springbox.GraphCellData Maven / Gradle / Ivy

/*
 * This file is part of GraphStream .
 * 
 * GraphStream is a library whose purpose is to handle static or dynamic
 * graph, create them from scratch, file or any source and display them.
 * 
 * This program is free software distributed under the terms of two licenses, the
 * CeCILL-C license that fits European law, and the GNU Lesser General Public
 * License. You can  use, modify and/ or redistribute the software under the terms
 * of the CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
 * URL  or under the terms of the GNU LGPL as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 * 
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL-C and LGPL licenses and that you accept their terms.
 */

/**
 * @since 2012-06-26
 * 
 * @author Antoine Dutot 
 * @author Guilhelm Savin 
 * @author Hicham Brahimi 
 */
package org.graphstream.ui.layout.springbox;

import java.util.Iterator;

import org.miv.pherd.Particle;
import org.miv.pherd.ntree.BarycenterCellData;
import org.miv.pherd.ntree.Cell;
import org.miv.pherd.ntree.CellData;
import org.miv.pherd.ntree.NTreeListener;

/**
 * A N-Tree cell data that both compute the barycenter of each cell (aggregate
 * position), the aggregate weight of each cell (sum of all of the cell node
 * weights) and the aggregate degree of each cell (sum of all of the cell node
 * degree).
 */
public class GraphCellData extends BarycenterCellData {
	/**
	 * Aggregate degree. The sum of the degrees of each node aggregated in this
	 * barycenter.
	 */
	public double degree;

	/**
	 * Aggregate degree. The sum of the degrees of each node aggregated in this
	 * barycenter.
	 */
	public double getDegree() {
		return degree;
	}

	@Override
	public CellData newCellData() {
		return new GraphCellData();
	}

	@Override
	public void recompute() {
		double x = 0;
		double y = 0;
		double z = 0;
		double n = 0;

		weight = 0;
		degree = 0;

		if (cell.isLeaf()) {
			Iterator particles = cell.getParticles();

			while (particles.hasNext()) {
				NodeParticle particle = (NodeParticle) particles.next();

				x += particle.getPosition().x;
				y += particle.getPosition().y;
				z += particle.getPosition().z;

				weight += particle.getWeight();
				degree += particle.getEdges().size();

				n++;
			}

			if (n > 0) {
				x /= n;
				y /= n;
				z /= n;
			}

			center.set(x, y, z);
		} else {
			double subcnt = cell.getSpace().getDivisions();
			double totpop = cell.getPopulation();
			int verif = 0;

			if (totpop > 0) {
				for (int i = 0; i < subcnt; ++i) {
					Cell subcell = cell.getSub(i);
					GraphCellData data = (GraphCellData) subcell.getData();
					double pop = subcell.getPopulation();

					verif += pop;

					x += data.center.x * pop;
					y += data.center.y * pop;
					z += data.center.z * pop;

					weight += data.weight;
					degree += data.degree;
				}

				assert verif == totpop : "Discrepancy in population counts ?";

				x /= totpop;
				y /= totpop;
				z /= totpop;
			}

			center.set(x, y, z);
		}

		for (NTreeListener listener : cell.getTree().getListeners()) {
			listener.cellData(cell.getId(), "barycenter", this);
		}
	}
}