Example that demonstrates how to listen to spot property changes.

src/test/java/org/mastodon/mamut/model/ModelPropertyListenerExample.java

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+package org.mastodon.mamut.model;
+
+import org.mastodon.properties.PropertyChangeListener;
+
+/**
+ * Example that demonstrates how to listen to spot property changes.
+ */
+public class ModelPropertyListenerExample
+{
+
+	public static void main( final String[] args )
+	{
+		final Model model = new Model();
+		final ModelGraph graph = model.getGraph();
+
+		final double radius = 3.;
+		final Spot spot = graph.addVertex().init( 0, new double[] { 0., 0., 0. }, radius );
+
+		final PropertyChangeListener< Spot > listener = s -> System.out.println( "The covariance of " + s + " changed!" );
+		graph.getVertexPool().covariance.propertyChangeListeners().add( listener );
+
+		final double[][] cov = new double[ 3 ][ 3 ];
+		final double newRadius = 10. * 10.;
+		covarianceFromRadiusSquared( newRadius, cov );
+		spot.setCovariance( cov );
+	}
+
+	private static void covarianceFromRadiusSquared( final double rsqu, final double[][] cov )
+	{
+		for ( int row = 0; row < 3; ++row )
+			for ( int col = 0; col < 3; ++col )
+				cov[ row ][ col ] = ( row == col ) ? rsqu : 0;
+	}
+}