//File: UnpleasantSurprise.java
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class UnpleasantSurprise extends Applet
{
// Surprise with an exploding balloon
// Author: Rachel McDermott, September 27, 1996
public void paint (Graphics g)
{
while (true)
{
animate (g);
}
}
public void animate (Graphics g)
{
Dimension size = getSize();
int
diameter = 0,
w = size.width,
h = size.height,
cmin = (int)Math.min(w,
h);
g.setColor(Color.yellow);
while (diameter < cmin)
{
g.fillOval((w-diameter)/2, (h-diameter)/2,
diameter, diameter);
diameter++;
try
{
Thread.sleep(10); // sleep for 10 msec
}
catch
(InterruptedException t)
{
}
}
Font current = getFont();
FontMetrics metrics = getFontMetrics (current);
int ws =
metrics.stringWidth("Surprise!");
int hf = metrics.getHeight();
g.setColor(Color.red);
g.drawString("Surprise!", (w-ws)/2,
(h+hf)/2);
}
}
Adapted from Bill Steinmetz's course summary by H. J. Bernstein, 8 November 2001, revised 23 October 2003