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Suren's Disk racer animation.

Fr Chris' notes

Its getting better and better!

/**

 * A Sample Animation with a Restart button
 * 
 * @author Fr Chris Thiel, OFMCap
 * @version 9 May 2007
 */

import java.awt.event.*; import java.applet.*; import java.applet.Applet; import java.awt.*; import javax.swing.*;

public class SampleAnimation extends Applet

  implements  ActionListener

{

    Timer timer;
    Image virtualMem;
    Graphics gBuffer;

    int appletWidth;        
    int appletHeight; 
    int frame;
    int lastFrame;
    double rate1=.5;
    double rate2=.5;
    double rate3=.5;
    double rate4=.5;
    double rate5=.5;
    Button myButton;
    AudioClip racecars;
   /**
     * ActionListener is an interface and
     * requires the actionPerformed() method
     * to be defined..in this case we
     * look for a restart button being pressed
     */
    public void actionPerformed(ActionEvent e)
    {
        Object source = e.getSource();
        if (source == timer) 
        {
            if (frame < lastFrame) 
            {
                frame++;
            }
            else {
              frame=0;
              rate1=Math.random();
              rate2=Math.random();
              rate3=Math.random();
              rate4=Math.random();
              rate5=Math.random();
            }
        }
            else {
            //restart button pressed
              frame=0;
              rate1=Math.random();
              rate2=Math.random();
              rate3=Math.random();
              rate4=Math.random();
              rate5=Math.random();
              if (timer.isRunning())
              {
                  timer.stop();
                  myButton.setLabel("Start");
                  if(racecars!=null)racecars.stop();
               }
               else
               {
                   timer.start();
                   myButton.setLabel("Stop");
                   if(racecars!=null) racecars.loop();
                }

            }
        repaint();
    }
    // OUR CLASS IS A SUBCLASS OF APPLET
    /**
     * this init() method will be run at the beginning
     * and where we create the Listeners 
     */


    public void init()
    {


        appletWidth = getWidth();
        appletHeight = getHeight(); 
        frame=0;
        timer=new Timer(10,this);
        lastFrame=appletWidth;
        virtualMem = createImage(appletWidth,appletHeight);
        gBuffer = virtualMem.getGraphics();
        gBuffer.setColor(Color.white);
        gBuffer.fillRect(0,0,appletWidth,appletHeight);


        myButton= new Button("5,4,3,2,1,0 Get Set Go!!!!!!!!");
        //the class is its own button listener
        myButton.addActionListener (this);
        add(myButton);
        //Audio
        racecars = getAudioClip(getDocumentBase(), "racecars.wav");
    }
    public int speed(int f, double p)
    {
        return (int)(f*p);
    }
     public void paint(Graphics g)
    {
        //We draw using the object methods of
        // the graphics buffer, not what is
        // currently on the screen
        gBuffer.setColor(Color.black);
        gBuffer.fillRect(0,0,appletWidth,appletHeight);gBuffer.setColor(Color.black);

        gBuffer.setColor(Color.black);
        gBuffer.drawString("Frame "+frame,20,20);
        gBuffer.setColor(Color.blue);
        gBuffer.fillOval(speed(frame,rate1), 200, 50,50);
        gBuffer.setColor(Color.orange);
        gBuffer.fillOval(speed(frame,rate2), 100, 50,50);
        gBuffer.setColor(Color.red);
        gBuffer.fillOval(speed(frame,rate3), 10, 50,50);
        gBuffer.setColor(Color.green);
        gBuffer.fillOval(speed(frame,rate4), 300, 50,50);
        gBuffer.setColor(Color.yellow);
        gBuffer.fillOval(speed(frame,rate5), 400, 50,50);


        //Now we send the result to the screen
        g.drawImage(virtualMem,0,0,this);
    }
    public void update(Graphics g)
    {
        paint(g); //get rid of flicker with this method
    }

}