/** Uses adversarial search for selecting the next action. */
private void proposeMove() {
Integer action;
int time = (timeCombo.getSelectedIndex() + 1) * 5;
AdversarialSearch<ConnectFourState, Integer> search;
switch (strategyCombo.getSelectedIndex()) {
case 0:
search = MinimaxSearch.createFor(game);
break;
case 1:
search = AlphaBetaSearch.createFor(game);
break;
case 2:
search = IterativeDeepeningAlphaBetaSearch.createFor(game, 0.0, 1.0, time);
break;
case 3:
search = new ConnectFourAIPlayer(game, time);
break;
default:
search = new ConnectFourAIPlayer(game, time);
((ConnectFourAIPlayer) search).setLogEnabled(true);
}
action = search.makeDecision(currState);
searchMetrics = search.getMetrics();
currState = game.getResult(currState, action);
}
/** Updates the status bar. */
private void updateStatus() {
String statusText;
if (!game.isTerminal(currState)) {
String toMove = (String) game.getPlayer(currState);
statusText = "Next move: " + toMove;
statusBar.setForeground(toMove.equals("red") ? Color.RED : Color.YELLOW);
} else {
String winner = null;
for (int i = 0; i < 2; i++)
if (game.getUtility(currState, game.getPlayers()[i]) == 1) winner = game.getPlayers()[i];
if (winner != null) statusText = "Color " + winner + " has won. Congratulations!";
else statusText = "No winner :-(";
statusBar.setForeground(Color.WHITE);
}
if (searchMetrics != null) statusText += " " + searchMetrics;
statusBar.setText(statusText);
}
/** Handles all button events and updates the view. */
@Override
public void actionPerformed(ActionEvent e) {
searchMetrics = null;
if (e == null || e.getSource() == clearButton) {
currState = game.getInitialState();
} else if (!game.isTerminal(currState)) {
if (e.getSource() == proposeButton) {
proposeMove();
} else if (e.getSource() instanceof GridElement) {
GridElement el = (GridElement) e.getSource();
currState = game.getResult(currState, el.col); // take next
// turn
}
}
repaint(); // paint all disks!
updateStatus();
}
/** Standard constructor. */
ConnectFourPanel() {
game = new ConnectFourGame();
currState = game.getInitialState();
setLayout(new BorderLayout());
setBackground(Color.BLUE);
JToolBar toolBar = new JToolBar();
toolBar.setFloatable(false);
strategyCombo =
new JComboBox(
new String[] {
"Minimax (not recommended)",
"Alpha-Beta (not recommended)",
"Iterative Deepening Alpha-Beta",
"Advanced Alpha-Beta",
"Advanced Alpha-Beta (log)"
});
strategyCombo.setSelectedIndex(3);
toolBar.add(strategyCombo);
timeCombo = new JComboBox(new String[] {"5sec", "10sec", "15sec", "20sec"});
timeCombo.setSelectedIndex(0);
toolBar.add(timeCombo);
toolBar.add(Box.createHorizontalGlue());
clearButton = new JButton("Clear");
clearButton.addActionListener(this);
toolBar.add(clearButton);
proposeButton = new JButton("Propose Move");
proposeButton.addActionListener(this);
toolBar.add(proposeButton);
add(toolBar, BorderLayout.NORTH);
int rows = currState.getRows();
int cols = currState.getCols();
JPanel boardPanel = new JPanel();
boardPanel.setLayout(new GridLayout(rows, cols, 5, 5));
boardPanel.setBorder(BorderFactory.createEtchedBorder());
boardPanel.setBackground(Color.BLUE);
for (int i = 0; i < rows * cols; i++) {
GridElement element = new GridElement(i / cols, i % cols);
boardPanel.add(element);
element.addActionListener(this);
}
add(boardPanel, BorderLayout.CENTER);
statusBar = new JLabel(" ");
statusBar.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
add(statusBar, BorderLayout.SOUTH);
updateStatus();
}