// TickerTape Applet, right out of "Java Programming Language Handbook"
import java.applet.*;
import java.awt.*;
// TickerTape Class
public class TickerTape extends Applet implements Runnable{ 
// Declare Variables 
   String inputText;
   String animSpeedString;
   Color color = new Color(255, 255, 255);
   int xpos; int fontLength;
   int fontHeight;
   int animSpeed;
   Font font;
   Thread ttapeThread = null;
   Image im;
   Graphics osGraphics;
   boolean suspended = false;
// Initialize Applet
public void init(){
   inputText = getParameter("TEXT");
   animSpeedString = getParameter("SPEED");
   animSpeed = Integer.parseInt(animSpeedString);
   im=createImage(size().width, size().height);
   osGraphics = im.getGraphics();
   xpos = size().width;
   fontHeight = 4 * size().height / 5;
   font = new Font("Helvetica", 1, fontHeight);
}
// Override Applet Class' paint method
public void paint(Graphics g){
   paintText(osGraphics);
   g.drawImage(im, 0, 0, null);
}
// Draw background and text on buffer image
public void paintText(Graphics g){
   g.setColor(Color.black);
   g.fillRect(0, 0, size().width, size().height);
   g.clipRect(0, 0, size().width, size().height);
   g.setFont(font); g.setColor(color);
   FontMetrics fmetrics = g.getFontMetrics();
   fontLength = fmetrics.stringWidth(inputText);
   fontHeight = fmetrics.getHeight();
   g.drawString(inputText, xpos, size().height - fontHeight / 4);
}
// Start Applet as thread 
public void start(){ 
   if(ttapeThread == null){
      ttapeThread = new Thread(this);
      ttapeThread.start();
   }
}
// Animate coordinates for drawing text 
public void setcoord(){
   xpos = xpos - animSpeed;
   if(xpos <- fontLength){
      xpos = size().width;
   }
}
// Change coordinates and repaint
public void run(){
   while(ttapeThread != null){
      try {
         Thread.sleep(50);
      } 
      catch (InterruptedException e){}
      setcoord();
      repaint();
   }
}
// Re-paint when buffer is updated
 public void update(Graphics g) {
    paint(g);
 }
// Handle mouse clicks
public boolean handleEvent(Event evt) {
   if (evt.id == Event.MOUSE_DOWN) {
      if (suspended) {
          ttapeThread.resume();
       } else {
          ttapeThread.suspend();
      } 
      suspended = !suspended;
   }
   return true;
}
// Stop thread then clean up before close
public void stop(){
    if(ttapeThread != null)
       ttapeThread.stop();
    ttapeThread = null;
   }
} 
// End TickerTape