import java.awt.*;

import java.awt.image.*;

import java.applet.*;

import java.net.*;

import java.io.InputStream;

public class Animation extends Applet implements Runnable {

public void init() {

/* get image */

img=getImage(getDocumentBase(),getParameter("imagename"));

imgCount=Integer.valueOf(getParameter("imagecount")).intValue();

setBackground(Color.white);

/* applet's component lay out */

setLayout(new BorderLayout());

Panel p = new Panel();

p.setLayout(new FlowLayout(FlowLayout.CENTER));

start_button=new Button("Start");

start_button.addActionListener(this);

stop_button=new Button("Stop");

stop_button.addActionListener(this);

stop_button.disable();

p.add(start_button);

p.add(stop_button);

add("South",p);

canvas=new Canvas();

add("Center",canvas);

}

public void run() {

while(true) {

repaint();

try {

Thread.sleep(100);

}catch(InterruptedException e){} ++currentImg; if(currentImg==imgCount)

currentImg=0;

}

}

public void stop() {

if(animation!=null) {

animation.stop();

animation=null;

}

}

public void paint(Graphics g) {

Graphics c=canvas.getGraphics();

if(ImgWidth<=0||ImgHeight<=0) {

Image buffer=createImage(1,1);

Graphics bg=buffer.getGraphics();

bg.drawImage(img,0,0,this);

bg.dispose();

return;

}

c.drawImage(img,0,-(ImgHeight/imgCount)*currentImg,null); c.dispose();

}

public boolean imageUpdate(Image image,int infoflags,int x,int y,int width,int height) {

if((infoflags&ImageObserver.ALLBITS)!=0) {

ImgWidth=img.getWidth(null);

ImgHeight=img.getHeight(null);

repaint();

return false;

} return true;

}

public void actionPerformed(ActionEvent evt){

String arg=evt.getActionCommand();

if(arg.equals("Start"){

start_button.disable();

stop_button.enable();

animation=new Thread(this);

animation.start();

}

else{

if(arg.equals("Stop")){

stop_button.disable();

start_button.enable();

animation.stop();

}

}

}

/*public boolean action(Event evt,Object arg) {

if(arg.equals("Start")) {

start_button.disable();

stop_button.enable();

animation=new Thread(this);

animation.start();

}

else{

if(arg.equals("Stop")) {

stop_button.disable();

start_button.enable();

animation.stop();

}

else return super.action(evt,arg);

} return true;

} */

private Image img;

private Thread animation;

private int currentImg=0;

private int imgCount;

private Button start_button,stop_button;

private Canvas canvas;

private int ImgWidth=0;

private int ImgHeight=0;

}