279 lines
10 KiB
Java
279 lines
10 KiB
Java
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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import javax.swing.event.*;
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import javax.swing.border.*;
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/**
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* This class implements a GUI interface to the KnightsTourBoard class
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*/
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public class KnightsTour extends JFrame
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{
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private KnightsTourBoard m_ktBoard = new KnightsTourBoard(5, 5);
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private Thread m_tourThread;
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/* GUI elements */
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private ActionEventHandler m_handler = new ActionEventHandler(this);
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private JTextField m_widthField;
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private JTextField m_heightField;
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private JTextField m_startXField;
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private JTextField m_startYField;
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private JButton m_startButton;
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private JButton m_cancelButton;
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private JButton m_exitButton;
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private JButton m_resetButton;
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private JPanel m_mainPanel;
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private JPanel m_boardPanel;
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private JLabel m_statusLabel;
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/**
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* Construct the KnightsTour GUI interface
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*/
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public KnightsTour()
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{
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super("Josh's Knight's Tour project for CS621");
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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setSize(500, 500);
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/* set up the main window contents */
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getContentPane().add(m_mainPanel = new JPanel(new BorderLayout()) {{
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setBorder(BorderFactory.createEmptyBorder(9, 9, 9, 9));
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add(new JPanel() {{
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setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
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add(new JPanel() {{
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setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
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setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 7));
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add(new JPanel() {{ /* board size panel */
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setBorder(BorderFactory.createTitledBorder("Board Size"));
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add(new JPanel() {{
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setBorder(BorderFactory.createEmptyBorder());
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setLayout(new GridLayout(2, 2, 5, 5));
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add(new JLabel("Width:", SwingConstants.RIGHT));
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add(m_widthField = new JTextField("5"));
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add(new JLabel("Height:", SwingConstants.RIGHT));
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add(m_heightField = new JTextField("5"));
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}});
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}});
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add(new Box.Filler(new Dimension(5, 0),
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new Dimension(5, 0),
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new Dimension(5, 0)));
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add(new JPanel() {{ /* starting position panel */
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setBorder(BorderFactory.createTitledBorder("Starting Position"));
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add(new JPanel() {{
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setBorder(BorderFactory.createEmptyBorder());
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setLayout(new GridLayout(2, 2, 5, 5));
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add(new JLabel("Column (X):", SwingConstants.RIGHT));
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add(m_startXField = new JTextField("2"));
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add(new JLabel("Row (Y):", SwingConstants.RIGHT));
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add(m_startYField = new JTextField("2"));
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}});
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}});
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add(new Box.Filler(new Dimension(5, 0),
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new Dimension(5, 0),
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new Dimension(5, 0)));
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add(new JPanel() {{ /* start button panel */
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setBorder(BorderFactory.createTitledBorder(
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"Control Knight's Tour"));
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add(new JPanel() {{
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setBorder(BorderFactory.createEmptyBorder());
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setLayout(new GridLayout(2, 2, 5, 5));
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add(m_startButton = new JButton("Start"));
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m_startButton.addActionListener(m_handler);
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add(m_resetButton = new JButton("Reset"));
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m_resetButton.addActionListener(m_handler);
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add(m_cancelButton = new JButton("Cancel"));
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m_cancelButton.addActionListener(m_handler);
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m_cancelButton.setEnabled(false);
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add(m_exitButton = new JButton("Exit"));
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m_exitButton.addActionListener(m_handler);
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}});
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}});
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add(new Box.Filler(new Dimension(0, 0),
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new Dimension(Short.MAX_VALUE, 0),
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new Dimension(10000, 10000)));
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}});
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add(new JPanel() {{
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setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
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add(m_statusLabel = new JLabel("Ready."));
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add(new Box.Filler(new Dimension(0, 0),
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new Dimension(10000, 0),
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new Dimension(10000, 10000)));
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}});
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}}, BorderLayout.NORTH);
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}});
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createBoardPanel();
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setVisible(true);
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}
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/* Create a JPanel containing a grid showing the step number
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* for each board position in the KnightsTourBoard object */
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private void createBoardPanel()
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{
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int width = m_ktBoard.getWidth();
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int height = m_ktBoard.getHeight();
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JPanel oldBoardPanel = m_boardPanel;
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m_boardPanel = new JPanel(new GridLayout(height, width, 1, 1));
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m_boardPanel.setBorder(BorderFactory.createEmptyBorder(5, 0, 0, 0));
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for (int y = 0; y < height; y++)
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{
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for (int x = 0; x < width; x++)
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{
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JLabel l = new JLabel(m_ktBoard.getStepAt(x, y) == 0
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? ""
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: new Integer(m_ktBoard.getStepAt(x, y)).toString(),
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SwingConstants.CENTER);
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l.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
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m_boardPanel.add(l);
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}
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}
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if (oldBoardPanel != null)
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m_mainPanel.remove(oldBoardPanel);
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m_mainPanel.add(m_boardPanel);
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m_mainPanel.validate();
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}
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/* This helper class catches actions that occur on JButton objects */
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private class ActionEventHandler implements ActionListener
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{
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private KnightsTour m_kt;
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public ActionEventHandler(KnightsTour kt) { m_kt = kt; }
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public void actionPerformed(ActionEvent e)
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{
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if (e.getSource() == m_startButton)
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{
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setUpTour(true);
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}
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else if (e.getSource() == m_cancelButton)
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{
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if (m_tourThread != null)
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{
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m_tourThread.stop();
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m_tourThread = null;
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m_startButton.setEnabled(true);
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m_cancelButton.setEnabled(false);
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m_resetButton.setEnabled(true);
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m_statusLabel.setText("Cancelled.");
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}
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}
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else if (e.getSource() == m_resetButton)
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{
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setUpTour(false);
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}
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else if (e.getSource() == m_exitButton)
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{
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System.exit(0);
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}
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}
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}
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/**
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* Helper method to set up the Knight's Tour GUI board
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* @param runit whether to run the tour or not (false means just reset board)
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*/
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private void setUpTour(boolean runit)
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{
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/* first validate input text fields */
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int width, height, startx, starty;
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try
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{
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width = Integer.parseInt(m_widthField.getText());
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height = Integer.parseInt(m_heightField.getText());
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startx = Integer.parseInt(m_startXField.getText());
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starty = Integer.parseInt(m_startYField.getText());
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}
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catch (NumberFormatException nfe)
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{
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m_statusLabel.setText("Non-numerical input!");
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return;
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}
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if (width < 1 || height < 1 || startx < 0 || starty < 0 ||
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startx >= width || starty >= height)
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{
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m_statusLabel.setText("Invalid input!");
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return;
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}
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/* create a new KnightsTourBoard object */
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m_ktBoard = new KnightsTourBoard(width, height);
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createBoardPanel();
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if (runit)
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{
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/* run the tour in a separate thread */
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m_startButton.setEnabled(false);
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m_cancelButton.setEnabled(true);
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m_resetButton.setEnabled(false);
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m_statusLabel.setText("Running...");
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m_tourThread = new Thread(new TourThread(startx, starty));
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m_tourThread.start();
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}
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else
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{
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m_statusLabel.setText("Reset.");
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}
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}
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/* This class runs as a separate thread to actually call
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* tour() on the KnightsTourBoard object. This way, the GUI
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* stays responsive and the user can cancel the tour by clicking
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* a button if it runs for too long. */
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private class TourThread implements Runnable
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{
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int m_startx, m_starty;
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/* create the tour thread with the given starting position */
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public TourThread(int startx, int starty)
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{
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m_startx = startx;
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m_starty = starty;
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}
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/* called when the thread starts executing */
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public void run()
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{
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if (m_ktBoard.tour(m_startx, m_starty))
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{
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SwingUtilities.invokeLater(new Runnable() {
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public void run()
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{
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createBoardPanel();
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m_statusLabel.setText("Finished.");
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m_startButton.setEnabled(true);
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m_cancelButton.setEnabled(false);
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m_resetButton.setEnabled(true);
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}
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});
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}
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else
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{
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SwingUtilities.invokeLater(new Runnable() {
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public void run()
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{
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createBoardPanel();
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m_statusLabel.setText("Solution not found!");
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m_startButton.setEnabled(true);
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m_cancelButton.setEnabled(false);
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m_resetButton.setEnabled(true);
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}
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});
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}
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m_tourThread = null;
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}
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}
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/**
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* This method is invoked first when the program is run.
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* It simply creates a KnightsTour GUI object
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*/
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public static void main(String[] args)
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{
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KnightsTour kt = new KnightsTour();
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}
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}
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