//: c14:ColorBoxes2.java
// Balancing thread use.
// <applet code=ColorBoxes2 width=600 height=500>
// <param name=grid value="12">
// <param name=pause value="50">
// </applet>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import com.bruceeckel.swing.*;
class CBox2 extends JPanel {
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)
];
}
void nextColor() {
cColor = newColor();
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(cColor);
Dimension s = getSize();
g.fillRect(0, 0, s.width, s.height);
}
}
class CBoxList
extends ArrayList implements Runnable {
private Thread t;
private int pause;
public CBoxList(int pause) {
this.pause = pause;
t = new Thread(this);
}
public void go() { t.start(); }
public void run() {
while(true) {
int i = (int)(Math.random() * size());
((CBox2)get(i)).nextColor();
try {
t.sleep(pause);
} catch(InterruptedException e) {
System.err.println("Interrupted");
}
}
}
public Object last() { return get(size() - 1);}
}
public class ColorBoxes2 extends JApplet {
private boolean isApplet = true;
private int grid = 12;
// Shorter default pause than ColorBoxes:
private int pause = 50;
private CBoxList[] v;
public void init() {
// Get parameters from Web page:
if (isApplet) {
String gsize = getParameter("grid");
if(gsize != null)
grid = Integer.parseInt(gsize);
String pse = getParameter("pause");
if(pse != null)
pause = Integer.parseInt(pse);
}
Container cp = getContentPane();
cp.setLayout(new GridLayout(grid, grid));
v = new CBoxList[grid];
for(int i = 0; i < grid; i++)
v[i] = new CBoxList(pause);
for (int i = 0; i < grid * grid; i++) {
v[i % grid].add(new CBox2());
cp.add((CBox2)v[i % grid].last());
}
for(int i = 0; i < grid; i++)
v[i].go();
}
public static void main(String[] args) {
ColorBoxes2 applet = new ColorBoxes2();
applet.isApplet = false;
if(args.length > 0)
applet.grid = Integer.parseInt(args[0]);
if(args.length > 1)
applet.pause = Integer.parseInt(args[1]);
Console.run(applet, 500, 400);
}
} ///:~