import java.applet.*;
import java.awt.*;

/*
@Author: Ingo Festag
@Date: January 97
@Version: 1.0
@Description : an animation controlled by the Media Tracker 
*/


/* modified2 class */
public class modified2 extends Applet implements Runnable {
        Thread spinThread = null;
        Image img[] = new Image[53];
        int counter =  1;
        int controller = 3;
	int differ = 0;
	int end = 0;
	
	Button b1, b2, b4, b5;

	MediaTracker tracker;

          
        
        /* class initialization */
        public void init() {
                int i;
		
		b1 = new Button("back");
       
        	b2 = new Button("play/pause");

        	b4 = new Button("stop");
	
		b5 = new Button("forward");
        

        //Add Components to the Applet, using the default FlowLayout. 
        add(b1);
        add(b2);
        add(b4);
	add(b5);

	setBackground(Color.white);

        //Necessary when adding buttons to an already visible container:
        validate();
                        tracker = new MediaTracker(this);  	
                	for (i=0;i<53;i++) {
                        						img[i]=getImage(getCodeBase(),"cropcomp/cimag"+i+".gif");
                         tracker.addImage (img [i], 0);			
                	}
        	}

        /* Next Spin image */
        public void nextSpin(){
			if (controller == 1) {				// if "back" is pressed
				if (counter == 52)
					end = 0;
				differ = 0;				// set play/pause to pause
				counter = counter - 1;
				if (counter == 0) {			// control beginning of animation
					counter = 1;
					}
				controller = 3;				// call pause function
				repaint();
				}											                              								

                        if (controller == 2) {				// if "play/pause" is pressed				
				if (differ == 1 )			// if play/pause is set to play
					if (end!=1) {			// and end of animation is not reached
                                		counter = counter + 1;  // count up
						if (counter == 52) {	// if end of animation is reached	
							controller = 3;	// call pause function
							end = 1;	// initalize end of animation
								}
							}
					else {
						counter = 1;		
						end = 0;				
						}
				if (differ == 0) {			// if button in pause modus		
					controller = 3;			// set pause modus
					}					
				}


                        if (controller == 3)  {	
									//do nothing			
									
					}


			if (controller == 4) {				// if "stop" is pressed
                                counter = 1;				//reset counter
				controller = 3;				//do nothing
				differ = 0;				//set play/pause to pause
                                }


                        if (controller == 5) {				// if "forward" is pressed
				differ = 0;                          
				counter = counter + 1;
				if (counter == 53) {
					counter = 52;
					differ = 1;
					end =1;
					}
				controller = 3;
	                                }
														
                        }


	 public void paint(Graphics g) {     
        	update(g);
    				}
					        
        
        /* draw the Spin image */
        public void update(Graphics g) {
		Dimension d = size();
          		
           if (!tracker.checkAll()) {
               g.drawString("Loading images...please wait", d.width/2-85, d.height/2);
	   }	
		else{

                g.drawImage(img[counter], 4, 50, this);
		g.setColor(Color.white);
		g.drawRect(150, 300, 250, 50);
		g.fillRect(150, 300, 250, 50);
		g.setColor(Color.black);	  
		g.drawString("week number " + counter +" of 1982", d.width/2-60, 310);

		}

        }

        /* start the thread */
        public void start() {
                if (spinThread == null) {
                        spinThread = new Thread(this);
                        spinThread.start();
                }
        }

        /* stop the thread */
          public void stop() {
               if (spinThread!=null) {
                       spinThread.stop();
                       spinThread = null;
                }
       }

        
	/* applet's run() method */             
  	public void run() {
	try {
               //Start downloading the images. Wait until they're loaded before requesting repaints 
               tracker.waitForAll();
           } catch (InterruptedException e) {}

                while (spinThread != null) {
                        repaint();
                        try {
                           spinThread.sleep(500);
                        }
                        catch(InterruptedException e) {
                        }
                        nextSpin();
                }
        }
                                                                                                                                                                                                                                                                                                     
        /* handle MOUSE_DOWN event */
        public boolean action(Event e, Object arg) {
		Object target = e.target;

                 if (target == b1) {		//if button "back" has been pressed      
                        controller = 1;
                }
		 if (target == b2) {		//if button "play/pause" has been pressed      
                        controller = 2;
			if (end != 1) {
			differ = 1 - differ;
				}
                }
		 if (target == b4) {		//if button "stop" has been pressed      
                        controller = 4;
                }
		 if (target == b5) {		//if button "forward" has been pressed
                        controller = 5;
                }
	
        return true;
        }
}