//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);
    	}
}