/** Layout the components on the GUI. */
public void layoutComponents() {
list = new JList(examples);
runButton = new JButton("Run Example");
exitButton = new JButton("Exit");
tabbedPane = new JTabbedPane();
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new FlowLayout(FlowLayout.CENTER));
buttonPane.add(runButton);
buttonPane.add(exitButton);
JPanel examplePane = new JPanel();
examplePane.setLayout(new BorderLayout());
examplePane.add(tabbedPane, BorderLayout.CENTER);
examplePane.add(buttonPane, BorderLayout.SOUTH);
JPanel contentPane = new JPanel();
contentPane.setLayout(new BorderLayout());
contentPane.add(new JScrollPane(list), BorderLayout.WEST);
contentPane.add(examplePane, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(contentPane, BorderLayout.CENTER);
setSize(840, 600);
setIconImages(Settings.getIconImages());
}
/**
* Solves this TSPLIB instance while displaying a GUI showing the optimization progress.
*
* @param instance the TSPLIB instance to solve
*/
public static void solve(TSPInstance instance) {
TSPPanel panel = new TSPPanel(instance);
panel.setAutoRepaint(false);
// create other components on the display
StringBuilder progress = new StringBuilder();
JTextArea progressText = new JTextArea();
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
splitPane.setTopComponent(panel);
splitPane.setBottomComponent(new JScrollPane(progressText));
splitPane.setDividerLocation(300);
splitPane.setResizeWeight(1.0);
// display the panel on a window
JFrame frame = new JFrame(instance.getName());
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(splitPane, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setSize(500, 400);
frame.setLocationRelativeTo(null);
frame.setIconImages(Settings.getIconImages());
frame.setVisible(true);
// create the optimization problem and evolutionary algorithm
Problem problem = new TSPProblem(instance);
Properties properties = new Properties();
properties.setProperty("swap.rate", "0.7");
properties.setProperty("insertion.rate", "0.9");
properties.setProperty("pmx.rate", "0.4");
Algorithm algorithm =
AlgorithmFactory.getInstance().getAlgorithm("NSGAII", properties, problem);
int iteration = 0;
// now run the evolutionary algorithm
while (frame.isVisible()) {
algorithm.step();
iteration++;
// clear existing tours in display
panel.clearTours();
// display population with light gray lines
if (algorithm instanceof EvolutionaryAlgorithm) {
EvolutionaryAlgorithm ea = (EvolutionaryAlgorithm) algorithm;
for (Solution solution : ea.getPopulation()) {
panel.displayTour(toTour(solution), lightGray);
}
}
// display current optimal solutions with red line
Tour best = toTour(algorithm.getResult().get(0));
panel.displayTour(best, Color.RED, new BasicStroke(2.0f));
progress.insert(0, "Iteration " + iteration + ": " + best.distance(instance) + "\n");
progressText.setText(progress.toString());
// repaint the TSP display
panel.repaint();
}
}