//: c14:ColorBoxes.java
// From Thinking in Java, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Using the Runnable interface
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class CBox extends JPanel implements Runnable {
  private Thread t;
  private int pause;
  private static final Color[] colors = { 
    Color.black, Color.blue, Color.cyan, 
    Color.darkGray, Color.gray, Color.green,
    Color.lightGray, Color.magenta, 
    Color.orange, Color.pink, Color.red, 
    Color.white, Color.yellow 
  };
  private Color cColor = newColor();
  private static final Color newColor() {
    return colors[
      (int)(Math.random() * colors.length)
    ];
  }
  public void paintComponent(Graphics  g) {
    super.paintComponent(g);
    g.setColor(cColor);
    Dimension s = getSize();
    g.fillRect(0, 0, s.width, s.height);
  }
  public CBox(int pause) {
    this.pause = pause;
    t = new Thread(this);
    t.start(); 
  }
  public void run() {
    while(true) {
      cColor = newColor();
      repaint();
      try {
        t.sleep((int) (Math.random()*pause));
      } catch(InterruptedException e) {}
    } 
  }
} 

public class ColorBoxes extends JFrame {
  public ColorBoxes(int pause, int grid) {
    setTitle("ColorBoxes");
    Container cp = getContentPane();
    cp.setLayout(new GridLayout(grid, grid));
    for (int i = 0; i < grid * grid; i++)
      cp.add(new CBox(pause));
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
  }   
  public static void main(String[] args) {
    int pause = 50;
    int grid = 8;
    if(args.length > 0) 
      pause = Integer.parseInt(args[0]);
    if(args.length > 1)
      grid = Integer.parseInt(args[1]);
    JFrame frame = new ColorBoxes(pause, grid);
    frame.setSize(500, 400);
    frame.setVisible(true);  
  }
} ///:~