» CS 1: Lecture 37 – Lights Out

CS 1: Lecture 37 – Lights Out

December 11, 2017 by Chris Johnson. Filed under cs1, cs145, cs148, fall 2017, lectures.

Dear students,

It’s the last week! Given that we’re all stressed and ready to be done, let’s play a game today. Just kidding, let’s make one instead. We’re going to implement Lights Out, which started off as a handheld game from Tiger Electronics:

The game is played on a 5×5 grid of lights, some of which are on and some of which are off. Your task is turn all of them off. But here’s the thing: when you press a button, you toggle it and its 4-neighbors. We’ll write a graphical application that listens to mouse clicks, detects a win state, and saves and loads board configurations. Here’s our checklist:

Here’s your TODO to complete before we meet again:

CS 145, tomorrow is our last lab. In case it hasn’t been made clear, tomorrow is your only opportunity to complete the lab 12 checkpoints. I will not have much time to help you during lab, as I will be running your peers’ robots.

See you next class!

Sincerely,

P.S. It’s time for a haiku!

I used to play games
Making them’s even harder
It’s that final boss

P.P.S. Here’s the code we wrote together…

LightsOutFrame.java

package lecture1211;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class LightsOutFrame extends JFrame implements MouseListener {
  private static final int PIXELS = 100;
  private static final int GAP = 2;

  private LightsOutPanel panel;
  private boolean[][] board;

  public LightsOutFrame() {
    board = new boolean[5][5];
//    board[2][3] = true;

    panel = new LightsOutPanel();
    panel.setPreferredSize(new Dimension(PIXELS * 5, PIXELS * 5));
    panel.addMouseListener(this);

    add(panel);
    
    JMenuItem saveLevel = new JMenuItem("Save level");
    JMenu menu = new JMenu("Level");
    JMenuBar menuBar = new JMenuBar();
    
    menu.add(saveLevel);
    menuBar.add(menu);
    setJMenuBar(menuBar);
    
    saveLevel.addActionListener(e -> {
      saveLevel();
    });

    pack();
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
  }
  
  private void saveLevel() {
    try {
      PrintWriter out = new PrintWriter(new File("/Users/johnch/Desktop/level"));
      for (int r = 0; r < 5; ++r) {
        for (int c = 0; c < 5; ++c) {
          out.print(board[r][c] + " ");
        }
        out.println();
      }
      out.close();
    } catch (IOException e) {
      System.out.println(e);
    }
  }

  class LightsOutPanel extends JPanel {
    public void paintComponent(Graphics g) {
      for (int r = 0; r < 5; ++r) {
        for (int c = 0; c < 5; ++c) {
          // (c, r)
          if (board[r][c]) {
            g.setColor(Color.YELLOW);
          } else {
            g.setColor(Color.BLACK);
          }
          g.fillRect(c * PIXELS + GAP, r * PIXELS + GAP, PIXELS - 2 * GAP, PIXELS - 2 * GAP);
        }
      }
    }
  }

  @Override
  public void mouseClicked(MouseEvent e) {
  }

  @Override
  public void mousePressed(MouseEvent e) {
  }

  @Override
  public void mouseReleased(MouseEvent e) {
//    System.out.println(e);
    int r = e.getY() / PIXELS;
    int c = e.getX() / PIXELS;
    flop(c, r);
    flop(c + 1, r);
    flop(c - 1, r);
    flop(c, r - 1);
    flop(c, r + 1);
    repaint();
    
    if (isWin()) {
      JOptionPane.showMessageDialog(this, "A winner is you!");
    }
  }

  private void flop(int c,
                    int r) {
    if (r >= 0 && r < 5 && c >= 0 && c < 5) {
      board[r][c] = !board[r][c];
    }
  }
  
  private boolean isWin() {
    for (int r = 0; r < 5; ++r) {
      for (int c = 0; c < 5; ++c) {
        if (board[r][c]) {
          return false;
        }
      }
    }
    return true;
  }

  @Override
  public void mouseEntered(MouseEvent e) {
  }

  @Override
  public void mouseExited(MouseEvent e) {
  }

}

LightsOut.java

package lecture1211;

public class LightsOut {
  public static void main(String[] args) {
    new LightsOutFrame();
  }
}

LightsOutFrame.java

package lecture1211;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class LightsOutFrame extends JFrame implements MouseListener {
  private static final int PIXELS = 50;
  private static final int BORDER = 3;

  private boolean[][] board;

  public LightsOutFrame() {
    board = new boolean[5][5];
//    board[2][4] = true;

    LightsOutPanel panel = new LightsOutPanel();
    add(panel);

    panel.addMouseListener(this);

    panel.setPreferredSize(new Dimension(5 * PIXELS, 5 * PIXELS));
    pack();
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
  }

  private class LightsOutPanel extends JPanel {
    public void paintComponent(Graphics g) {
      for (int r = 0; r < 5; ++r) {
        for (int c = 0; c < 5; ++c) {
          if (board[r][c]) {
            g.setColor(Color.GREEN);
          } else {
            g.setColor(Color.RED);
          }
          g.fillRect(c * PIXELS + BORDER, r * PIXELS + BORDER, PIXELS - BORDER * 2, PIXELS - BORDER * 2);
        }
      }
    }
  }

  @Override
  public void mouseClicked(MouseEvent e) {
  }

  @Override
  public void mousePressed(MouseEvent e) {
  }

  @Override
  public void mouseReleased(MouseEvent e) {
    int r = e.getY() / PIXELS;
    int c = e.getX() / PIXELS;
    flip(c, r);
    flip(c + 1, r);
    flip(c - 1, r);
    flip(c, r - 1);
    flip(c, r + 1);
    repaint();
    
    if (isWin()) {
      JOptionPane.showMessageDialog(this, "You winned!");
    }
  }
  
  private boolean isWin() {
    for (int r = 0; r < 5; ++r) {
      for (int c = 0; c < 5; ++c) {
        if (board[r][c]) {
          return false;
        }
      }
    }
    return true;
  }

  private void flip(int c,
                    int r) {
    if (c >= 0 && c < 5 && r >= 0 && r < 5) {
      board[r][c] = !board[r][c];
    }
  }

  @Override
  public void mouseEntered(MouseEvent e) {
  }

  @Override
  public void mouseExited(MouseEvent e) {
  }
}

LightsOut.java

package lecture1211;

public class LightsOut {
  public static void main(String[] args) {
    new LightsOutFrame();
  }
}