import javax.swing.*; 
import java.awt.*;
import java.awt.event.*; 

class World extends JComponent implements KeyListener, ActionListener {
  int count;
  public void actionPerformed(ActionEvent e) {
    this.count += 1; 
    System.out.println("Ouch..." + this.count);  
  }
  public void keyPressed(KeyEvent e) { 
    int value = e.getKeyCode();
    System.out.println("Key pressed: " + (char) value); 
    switch (value) {
      // http://docs.oracle.com/javase/6/docs/api/java/awt/event/KeyEvent.html#VK_LEFT
      case KeyEvent.VK_LEFT : System.out.println("Left arrow pressed."); break;
      case KeyEvent.VK_RIGHT: System.out.println("Right arrow pressed."); break;
      case KeyEvent.VK_UP   : System.out.println("Up arrow pressed."); break;
      case KeyEvent.VK_DOWN : System.out.println("Down arrow pressed."); break;
      case KeyEvent.VK_SPACE: System.out.println("Space bar pressed."); break;
      default: System.out.println("Unknown key pressed."); break; 
    }
  }
  public void keyReleased(KeyEvent e) { }
  public void keyTyped(KeyEvent e) { }
  Square a, b, c, d; 
  Timer timer;
  World() {
    this.timer = new Timer(1000, this); 
    this.a = new Square(this, Color.RED, 2, 3); 
    this.b = new Square(this, Color.BLUE, 3, 4); 
    this.c = new Square(this, Color.GREEN, 2, 5);     
    this.d = new Square(this, Color.YELLOW, 1, 4); 
  }
  void start() {
    this.timer.start();  
  }
  public void paintComponent(Graphics g) {
    g.drawString("Welcome to Tetris!", 50, 150);
    a.draw(g);
    b.draw(g);
    c.draw(g);
    d.draw(g);
    
  }
  static final int ROWS = 22;
  static final int COLS = 10; 
  int squareWidth() { return (int) getSize().getWidth() / World.COLS; }
  int squareHeight() { return (int) getSize().getHeight() / World.ROWS; }
}