//AlphaTime.java
//Demonstrates synchronization
//Andy Harris, 06/00

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
import java.text.*;

public class AlphaTime extends Applet implements Runnable,
                                                 ActionListener{

  Image imgA;
  Image imgB;
  Image imgC;
  Image imgD;
  Image imgE;
  Image imgF;
  
  AudioClip sndPoem;
  Canvas drawSurface = new Canvas();
  Button btnPlay = new Button("Start");
  Label lblTime = new Label("00:00");
  Thread looper;

  SimpleDateFormat formatter = new SimpleDateFormat("mm:ss");
  Date startTime = new Date();
  Date currentTime = new Date();
  Date elapsedTime = new Date();						
  boolean keepPlaying = false;

  public void init(){

    System.out.println(String.valueOf(getDocumentBase()));
    imgA = this.getImage(this.getDocumentBase(), "A.jpg");
    imgB = this.getImage(this.getDocumentBase(), "B.jpg");
    imgC = this.getImage(this.getDocumentBase(), "C.jpg");
    imgD = this.getImage(this.getDocumentBase(), "D.jpg");
    imgE = this.getImage(this.getDocumentBase(), "E.jpg");
    imgF = this.getImage(this.getDocumentBase(), "F.jpg");

    sndPoem = this.getAudioClip(getDocumentBase(), "Poem.au");

    //set up mediatracker
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(imgA, 0);
    tracker.addImage(imgB, 1);
    tracker.addImage(imgC, 2);
    tracker.addImage(imgD, 3);
    tracker.addImage(imgE, 4);
    tracker.addImage(imgF, 5);

    //wait until all images are loaded
    try{
      tracker.waitForAll();
    } catch (InterruptedException exc){
      System.out.println(exc.getMessage());
    } // end try

    //Set up applet
    setLayout (new BorderLayout());
    add (lblTime, BorderLayout.NORTH);
    add (drawSurface, BorderLayout.CENTER);
    add (btnPlay, BorderLayout.SOUTH);
    lblTime.setAlignment(Label.CENTER);
    
    btnPlay.addActionListener(this);
    
  } // end init

  public void actionPerformed(ActionEvent e){

    keepPlaying = true;
    sndPoem.play();
    startTime = new Date();
    
    //start the thread
    if (looper == null){
      looper = new Thread(this);
      looper.start();
    } // end if
  } // end actionPerformed

  public void run(){

    Graphics g = drawSurface.getGraphics();
    Dimension size = drawSurface.getSize();
    int ht = size.height;
    int wd = size.width;
    String elTime = "";

    while (keepPlaying == true){
      
      try {
        looper.sleep(500);
      } catch(InterruptedException exp){
        System.out.println(exp.getMessage());
      } // end try

      currentTime = new Date();

      long elTimeRaw =  currentTime.getTime() - startTime.getTime();
      elapsedTime = new Date(elTimeRaw);
      elTime = formatter.format(elapsedTime);
      lblTime.setText(elTime);

      //Display the appropriate image
      if (elTime.equals("00:00")){
        g.drawImage(imgA, 0, 0, wd, ht, this); 
      } else if (elTime.equals("00:04")){
        g.drawImage(imgB, 0, 0, wd, ht, this); 
      } else if (elTime.equals("00:08")){
        g.drawImage(imgC, 0, 0, wd, ht, this); 
      } else if (elTime.equals("00:12")){
        g.drawImage(imgD, 0, 0, wd, ht, this); 
      } else if (elTime.equals("00:16")){
        g.drawImage(imgE, 0, 0, wd, ht, this); 
      } else if (elTime.equals("00:20")){
        g.drawImage(imgF, 0, 0, wd, ht, this); 
      } else if (elTime.equals("00:25")){
        keepPlaying = false;
      } // end if

    } // end while  
  } // end run

  public void stop(){
    //kill the thread
    keepPlaying = false;						   
  } // end stop

} // end class def