Minesweeper in Java
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Revision as of 08:00, 29 July 2010 by JustinC474 (Talk | contribs) (Created page with 'This tutorial gives a brief overview of what to do to get a small, graphical Minesweeper game running on your Overo. If you have not done so, please go through the tutorials [[Ec…')
This tutorial gives a brief overview of what to do to get a small, graphical Minesweeper game running on your Overo. If you have not done so, please go through the tutorials Eclipse on Gumstix for new users and HelloWorld in Java.
- Create a new Project in Eclipse
- File -> New Project -> Java Project
- Create a class Main Class
- Copy and paste the following code to that class:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class MainClass {
public static void main(String args[]) {
JFrame f = new JFrame("JColorChooser Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JButton button = new JButton("Pick to Change Background");
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
Color initialBackground = button.getBackground();
Color background = JColorChooser.showDialog(null,
"JColorChooser Sample", initialBackground);
if (background != null) {
button.setBackground(background);
}
}
};
button.addActionListener(actionListener);
f.add(button, BorderLayout.CENTER);
f.setSize(300, 200);
f.setVisible(true);
}
}
- Create a class MineSweeper (Capital S!)
- Copy and paste the following code to that class:
import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class MineSweeper extends JPanel implements AWTEventListener, ActionListener {
public static enum State {
Clicked, Marked, Initial, WrongMarked
}
public static enum GameState {
NotStarted, Playing, Finished
}
private static final int MAX_BOMB_COUNT = 10;
private int ROWS = 9, COLUMNS = 9, TOTAL = ROWS * COLUMNS;
private JPanel pnlMain = new JPanel(new GridLayout(ROWS, COLUMNS));
private JLabel lblBombCount = new JLabel(MAX_BOMB_COUNT + "");
private JLabel lblTimer = new JLabel("0");
private boolean isColorCheatOn = false;
private JButton btnReset = new JButton("Reset");
private void startThread() {
Thread th = new Thread(new Runnable() {
public void run() {
while (state == GameState.Playing) {
lblTimer.setText((Long.parseLong(lblTimer.getText()) + 1) + "");
lblTimer.updateUI();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
th.start();
}
private GameState state = GameState.NotStarted;
public MineSweeper() {
setLayout(new BorderLayout());
add(pnlMain, BorderLayout.CENTER);
createButtons();
addControlPanel();
Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);
}
private void showAbout() {
JOptionPane.showMessageDialog(this, "<html>Author : Justin Cowles Cowperthwaite <br>Version : 1.0</html>", "About", JOptionPane.INFORMATION_MESSAGE);
}
private void restartGame() {
state = GameState.NotStarted;
lblTimer.setText("0");
pnlMain.removeAll();
createButtons();
pnlMain.updateUI();
lblBombCount.setText("" + MAX_BOMB_COUNT);
lblBombCount.updateUI();
}
private void addControlPanel() {
JPanel pnlTimer = new JPanel(new FlowLayout(FlowLayout.RIGHT));
pnlTimer.add(lblTimer);
JPanel pnl = new JPanel(new FlowLayout(FlowLayout.CENTER));
btnReset.setToolTipText("<HTML>Press <B>F2</B> to reset the current game</HTML>");
pnl.add(lblBombCount);
pnl.add(btnReset);
JPanel pnlN = new JPanel(new GridLayout(1, 3));
pnlN.add(lblBombCount);
pnlN.add(pnl);
pnlN.add(pnlTimer);
add(pnlN, BorderLayout.NORTH);
btnReset.addActionListener(this);
}
private void createButtons() {
List<Point> lstBombsLocation = new ArrayList<Point>();
for (int row = 0; row < ROWS; row++) {
for (int col = 0; col < COLUMNS; col++) {
JButton btn = getButton(lstBombsLocation, TOTAL, new Point(row, col) {
@Override
public String toString() {
return (int) getX() + ", " + (int) getY();
}
@Override
public boolean equals(Object obj) {
return ((Point) obj).getX() == getX() && ((Point) obj).getY() == getY();
}
});
pnlMain.add(btn);
}
}
while (lstBombsLocation.size() < MAX_BOMB_COUNT) {
updateBomds(lstBombsLocation, pnlMain.getComponents());
}
for (Component c : pnlMain.getComponents()) {
updateBombCount((GameButton) c, pnlMain.getComponents());
}
// System.out.println("Total Bomb Count: " + lstBombsLocation.size());
}
private void updateBomds(List<Point> lstBombsLocation, Component[] components) {
// int currentPosition = new Double(((location.x) * COLUMNS ) +
// location.getY()).intValue();
Random r = new Random();
for (Component c : components) {
Point location = ((GameButton) c).getPosition();
int currentPosition = new Double(((location.x) * COLUMNS) + location.getY()).intValue();
int bombLocation = r.nextInt(TOTAL);
if (bombLocation == currentPosition) {
((GameButton) c).setBomb(true);
lstBombsLocation.add(((GameButton) c).getPosition());
return;
}
}
}
private GameButton getButton(List<Point> lstBombsLocation, int totalLocations, Point location) {
GameButton btn = new GameButton(location);
btn.setMargin(new Insets(0, 0, 0, 0));
btn.setFocusable(false);
if (lstBombsLocation.size() < MAX_BOMB_COUNT) {
if (isBomb()) {
btn.setBomb(true);
lstBombsLocation.add(location);
}
}
btn.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent mouseEvent) {
if (state != GameState.Playing) {
state = GameState.Playing;
startThread();
}
if (((GameButton) mouseEvent.getSource()).isEnabled() == false) {
return;
}
if (mouseEvent.getButton() == MouseEvent.BUTTON1) {
if (((GameButton) mouseEvent.getSource()).getState() == State.Marked) {
((GameButton) mouseEvent.getSource()).setState(State.Initial);
lblBombCount.setText((Long.parseLong(lblBombCount.getText()) + 1) + "");
((GameButton) mouseEvent.getSource()).updateUI();
return;
}
((GameButton) mouseEvent.getSource()).setState(State.Clicked);
if (((GameButton) mouseEvent.getSource()).isBomb()) {
blastBombs();
return;
} else {
if (((GameButton) mouseEvent.getSource()).getBombCount() == 0) {
updateSurroundingZeros(((GameButton) mouseEvent.getSource()).getPosition());
}
}
if (!checkGameState()) {
((GameButton) mouseEvent.getSource()).setEnabled(false);
}
} else if (mouseEvent.getButton() == MouseEvent.BUTTON3) {
if (((GameButton) mouseEvent.getSource()).getState() == State.Marked) {
((GameButton) mouseEvent.getSource()).setState(State.Initial);
lblBombCount.setText((Long.parseLong(lblBombCount.getText()) + 1) + "");
} else {
((GameButton) mouseEvent.getSource()).setState(State.Marked);
lblBombCount.setText((Long.parseLong(lblBombCount.getText()) - 1) + "");
}
}
((GameButton) mouseEvent.getSource()).updateUI();
}
});
return btn;
}
private boolean checkGameState() {
boolean isWin = false;
for (Component c : pnlMain.getComponents()) {
GameButton b = (GameButton) c;
if (b.getState() != State.Clicked) {
if (b.isBomb()) {
isWin = true;
} else {
return false;
}
}
}
if (isWin) {
state = GameState.Finished;
for (Component c : pnlMain.getComponents()) {
GameButton b = (GameButton) c;
if (b.isBomb()) {
b.setState(State.Marked);
}
b.setEnabled(false);
}
JOptionPane.showMessageDialog(this, "You win the game :D", "Congrats", JOptionPane.INFORMATION_MESSAGE, null);
}
return isWin;
}
private void updateSurroundingZeros(Point currentPoint) {
Point[] points = getSurroundings(currentPoint);
for (Point p : points) {
GameButton b = getButtonAt(pnlMain.getComponents(), p);
if (b != null && b.getBombCount() == 0 && b.getState() != State.Clicked && b.getState() != State.Marked && b.isBomb() == false) {
b.setState(State.Clicked);
updateSurroundingZeros(b.getPosition());
b.updateUI();
}
if (b != null && b.getBombCount() > 0 && b.getState() != State.Clicked && b.getState() != State.Marked && b.isBomb() == false) {
b.setEnabled(false);
b.setState(State.Clicked);
b.updateUI();
}
}
}
private void blastBombs() {
int blastCount = 0;
for (Component c : pnlMain.getComponents()) {
((GameButton) c).setEnabled(false);
((GameButton) c).transferFocus();
if (((GameButton) c).isBomb() && ((GameButton) c).getState() != State.Marked) {
((GameButton) c).setState(State.Clicked);
((GameButton) c).updateUI();
blastCount++;
}
if (((GameButton) c).isBomb() == false && ((GameButton) c).getState() == State.Marked) {
((GameButton) c).setState(State.WrongMarked);
}
}
lblBombCount.setText("" + blastCount);
lblBombCount.updateUI();
state = GameState.Finished;
JOptionPane.showMessageDialog(this, "You loose the game :(", "Game Over", JOptionPane.ERROR_MESSAGE, null);
for (Component c : pnlMain.getComponents()) {
GameButton b = (GameButton) c;
b.setEnabled(false);
}
}
private boolean isBomb() {
Random r = new Random();
return r.nextInt(ROWS) == 1;
}
public static void main(String[] args) {
JFrame fr = new JFrame("MineSweeper");
fr.setLayout(new BorderLayout());
fr.add(new MineSweeper());
fr.setResizable(false);
fr.setSize(250, 350);
fr.setLocationRelativeTo(null);
fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fr.setVisible(true);
}
class GameButton extends JButton {
private boolean isBomb = false;
private Point position = null;
private int bombCount = 0;
private State state = State.Initial;
public void setState(State state) {
this.state = state;
if (getBombCount() == 0 && !isBomb) {
setEnabled(false);
}
}
public State getState() {
return state;
}
public int getBombCount() {
return bombCount;
}
public void setBombCount(int bombCount) {
this.bombCount = bombCount;
}
public GameButton(Point position) {
setPosition(position);
setText(position.toString());
}
public Point getPosition() {
return position;
}
public void setPosition(Point position) {
this.position = position;
}
public boolean isBomb() {
return isBomb;
}
public void setBomb(boolean isBomb) {
this.isBomb = isBomb;
}
@Override
public String getText() {
if (state == State.Initial) {
return "";
}
if (state == State.Marked) {
return "\u00B6";
}
if (state == State.Clicked) {
if (isBomb) {
return "<html><font size='16'><b>*</b></font></html>";
} else {
if (getBombCount() > 0)
return getBombCount() + "";
else
return "";
}
}
if (state == State.WrongMarked) {
return "X";
}
return super.getText();
}
@Override
public Color getBackground() {
if (isColorCheatOn && isBomb) {
return Color.MAGENTA;
}
if (state == State.Clicked) {
if (isBomb) {
return Color.RED;
}
if (getBombCount() > 0) {
return Color.GREEN;
}
}
if (isEnabled()) {
return Color.YELLOW.brighter();
} else {
return super.getBackground();
}
}
}
private Point[] getSurroundings(Point cPoint) {
int cX = (int) cPoint.getX();
int cY = (int) cPoint.getY();
Point[] points = { new Point(cX - 1, cY - 1), new Point(cX - 1, cY), new Point(cX - 1, cY + 1), new Point(cX, cY - 1), new Point(cX, cY + 1), new Point(cX + 1, cY - 1), new Point(cX + 1, cY), new Point(cX + 1, cY + 1) };
return points;
}
private void updateBombCount(GameButton btn, Component[] components) {
Point[] points = getSurroundings(btn.getPosition());
for (Point p : points) {
GameButton b = getButtonAt(components, p);
if (b != null && b.isBomb()) {
btn.setBombCount(btn.getBombCount() + 1);
}
}
btn.setText(btn.getBombCount() + "");
}
private GameButton getButtonAt(Component[] components, Point position) {
for (Component btn : components) {
if ((((GameButton) btn).getPosition().equals(position))) {
return (GameButton) btn;
}
}
return null;
}
public void eventDispatched(AWTEvent event) {
if (KeyEvent.class.isInstance(event) && ((KeyEvent) (event)).getID() == KeyEvent.KEY_RELEASED) {
if (((KeyEvent) (event)).getKeyCode() == KeyEvent.VK_F1) {
showAbout();
}
if (((KeyEvent) (event)).getKeyCode() == KeyEvent.VK_F2) {
restartGame();
}
if (((KeyEvent) (event)).getKeyCode() == KeyEvent.VK_F3) {
isColorCheatOn = !isColorCheatOn;
if (state == GameState.Playing) {
pnlMain.updateUI();
}
}
if (((KeyEvent) (event)).getKeyCode() == KeyEvent.VK_F12) {
for (Component c : pnlMain.getComponents()) {
GameButton b = (GameButton) c;
if (b.isBomb() == false) {
b.setState(State.Clicked);
} else {
b.setState(State.Marked);
}
b.setEnabled(false);
}
checkGameState();
}
}
}
public void actionPerformed(ActionEvent actionEvent) {
if (actionEvent.getSource() == btnReset) {
restartGame();
}
}
}
Go back to HelloWorld in Java and follow the instructions for Exporting and Running a Java Program on the Over COM. When you are done, you should be able to play a 9x10 colorful game of MineSweeper on the monitor connected to your Overo COM expansion board.
