The Java Program: PanelDemo.java
1 /*
2 * <applet code="PanelDemo.class" width=200 height=200></applet>
3 */
4
5 import java.applet.Applet;
6 import java.awt.*;
7
8 class GrayCanvas extends Canvas {
9 Color gray;
10 public GrayCanvas (float g) {
11 gray = new Color(g, g, g);
12 }
13 public void paint(Graphics g) {
14 Dimension size = size();
15 g.setColor(gray);
16 g.fillRect(0, 0, size.width, size.height);
17 g.setColor(Color.black);
18 g.drawRect(0, 0, size.width-1, size.height-1);
19 }
20 }
21
22 public class PanelDemo extends Applet {
23 static final int n = 4;
24 public void init() {
25 setLayout(null);
26 Dimension d = this.size();
27 int width = d.width;
28 int height = d.height;
29 for (int i = 0; i<n; i++) {
30 for (int j = 0; j<n; j++) {
31 float g = (i*n + j) / (float) (n*n);
32 Canvas c = new GrayCanvas(g);
33 add(c);
34 c.resize (width/n, height/n);
35 c.move (i*width/n, j*height/n);
36 }
37 }
38 }
39 }