Commit 3f5e74bb authored by gsavin's avatar gsavin

Add degree centrality measure with demo.

parent 110cbf93
/*
* Copyright 2006 - 2012
* Stefan Balev <stefan.balev@graphstream-project.org>
* Julien Baudry <julien.baudry@graphstream-project.org>
* Antoine Dutot <antoine.dutot@graphstream-project.org>
* Yoann Pigné <yoann.pigne@graphstream-project.org>
* Guilhelm Savin <guilhelm.savin@graphstream-project.org>
*
* This file is part of GraphStream <http://graphstream-project.org>.
*
* 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 <http://www.cecill.info> 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 <http://www.gnu.org/licenses/>.
*
* 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.
*/
package org.graphstream.algorithm.measure.demo;
import org.graphstream.algorithm.generator.BarabasiAlbertGenerator;
import org.graphstream.algorithm.measure.DegreeCentrality;
import org.graphstream.graph.Graph;
import org.graphstream.graph.implementations.AdjacencyListGraph;
public class DegreeCentralityDemo {
public static final String STYLE = "node {" + "fill-mode: dyn-plain;"
+ "fill-color: blue,yellow;" + "size-mode: dyn-size;"
+ "stroke-color: black;" + "stroke-width: 1px;"
+ "stroke-mode: plain;" + "}";
public static void main(String... args) {
System.setProperty("org.graphstream.ui.renderer",
"org.graphstream.ui.j2dviewer.J2DGraphRenderer");
Graph g = new AdjacencyListGraph("g");
g.addAttribute("ui.quality");
g.addAttribute("ui.antialias");
g.addAttribute("ui.stylesheet", STYLE);
BarabasiAlbertGenerator gen = new BarabasiAlbertGenerator();
gen.addSink(g);
gen.begin();
for (int i = 0; i < 200; i++)
gen.nextEvents();
gen.end();
DegreeCentrality dc = new DegreeCentrality("ui.color", true);
dc.init(g);
dc.compute();
for (int i = 0; i < g.getNodeCount(); i++)
g.getNode(i).addAttribute("ui.size",
g.getNode(i).getNumber("ui.color") * 25 + 5);
g.display();
}
}
/*
* Copyright 2006 - 2012
* Stefan Balev <stefan.balev@graphstream-project.org>
* Julien Baudry <julien.baudry@graphstream-project.org>
* Antoine Dutot <antoine.dutot@graphstream-project.org>
* Yoann Pigné <yoann.pigne@graphstream-project.org>
* Guilhelm Savin <guilhelm.savin@graphstream-project.org>
*
* This file is part of GraphStream <http://graphstream-project.org>.
*
* 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 <http://www.cecill.info> 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 <http://www.gnu.org/licenses/>.
*
* 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.
*/
package org.graphstream.algorithm.measure;
public class DegreeCentrality extends AbstractCentrality {
public static enum Mode {
INOUT, IN, OUT
}
/**
* Defines which degree should be used. It only get a sense with directed
* graph.
*/
protected Mode mode;
/**
* Constructor allowing configuration of centrality attribute and
* normalization flag. Mode will be {@link Mode#INOUT}.
*
* @param attribute
* name of the attribute where centrality values will be stored
* @param normalize
* if true, centrality values will be normalized between 0 and 1
*/
public DegreeCentrality(String attribute, boolean normalize) {
this(attribute, normalize, Mode.INOUT);
}
/**
* Same as {@link #DegreeCentrality(String, boolean)} but allows to
* configure the mode.
*
* @param attribute
* name of the attribute where centrality values will be stored
* @param normalize
* if true, centrality values will be normalized between 0 and 1
* @param mode
* set which degree should be used (in degree, out degree or
* both)
*/
public DegreeCentrality(String attribute, boolean normalize, Mode mode) {
super(attribute, normalize);
this.mode = mode;
}
/*
* (non-Javadoc)
*
* @see
* org.graphstream.algorithm.measure.AbstractCentrality#computeCentrality()
*/
protected void computeCentrality() {
int count = graph.getNodeCount();
switch (mode) {
case INOUT:
for (int idx = 0; idx < count; idx++)
data[idx] = graph.getNode(idx).getDegree();
break;
case IN:
for (int idx = 0; idx < count; idx++)
data[idx] = graph.getNode(idx).getInDegree();
break;
case OUT:
for (int idx = 0; idx < count; idx++)
data[idx] = graph.getNode(idx).getOutDegree();
break;
}
}
}
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