import java.applet.*;
import java.awt.*;
/*
@Author: Ajit Kumar (ajit@omnikron.com)
@Date: Jan 96
@Version: 0.1
@Description : A simple animation applet to demonstrate use of threads.
*/
/* SpinTop class */
public class SpinTop extends Applet implements Runnable {
Thread spinThread = null;
Image img[] = new Image[18];
int counter = 0;
int clockwise = 1;
/* class initialization */
public void init() {
int i;
for (i=0;i<18;i++) {
img[i]=getImage(getCodeBase(),"tops"+i+".gif");
}
}
/* Next Spin image */
public void nextSpin(){
if (clockwise==1) {
counter = counter + 1;
if (counter == 18) {
counter = 0;
}
}
else {
counter = counter -1;
if (counter < 0) {
counter = 17;
}
}
}
/* draw the Spin image */
public void update(Graphics g) {
g.drawImage(img[counter],0,0,this);
}
/* 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() {
while (spinThread != null) {
repaint();
try {
spinThread.sleep(75);
}
catch(InterruptedException e) {
}
nextSpin();
}
}
/* handle MOUSE_DOWN event */
public boolean handleEvent(Event e){
if (e.id == Event.MOUSE_DOWN) {
clockwise = 1 - clockwise;
}
return true;
}
}