// AnimationTest Demo

import java.awt.*;

import javax.swing.*;

import java.util.*;

import java.awt.image.*;

import java.net.*;

public class AnimationTest extends JFrame implements Runnable

{

static int SCREENWIDTH = 640;

static int SCREENHEIGHT = 480;

Thread gameloop;

Random rand = new Random();

// double buffer objects

BufferedImage backbuffer;

Graphics2D g2d;

//sprite variables

Image image;

Point pos = new Point(300,200);

// Animation variables

int currentFrame = 0;

int totalFrames = 30;

int animationDirection = 1;

int frameCount = 0;

int frameDelay = 10;

public static void main(String[] args)

{

new AnimationTest();

}

public AnimationTest()

{

super("Animation Test");

setSize(SCREENWIDTH,SCREENHEIGHT);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// create the back buffer for smooth graphics

backbuffer = new BufferedImage(SCREENWIDTH,SCREENHEIGHT,

BufferedImage.TYPE_INT_RGB);

g2d = backbuffer.createGraphics();

// load the ball animation strip

Toolkit tk = Toolkit.getDefaultToolkit();

image = tk.getImage(getURL("explosion.png"));

gameloop = new Thread(this);

gameloop.start();

}

private URL getURL(String filename)

{

URL url = null;

try{

url= this.getClass().getResource(filename);

}

catch(Exception e) {}

return url;

}

public void run()

{

Thread t = Thread.currentThread();

while (t==gameloop)

{

try{

Thread.sleep(5);

}

catch (InterruptedException e) {

e.printStackTrace();

}

gameUpdate();

}

}

public void gameUpdate()

{

// Clear the background

g2d.setColor(Color.BLACK);

g2d.fill(new Rectangle(0,0, SCREENWIDTH-1,SCREENHEIGHT-1));

// draw the current frame of animation

drawFrame(image, g2d, pos.x, pos.y, 6, currentFrame, 128, 128);

g2d.setColor(Color.WHITE);

g2d.drawString("Position: " + pos.x +","+pos.x, 10, 50);

g2d.drawString("Animation: " + currentFrame, 10, 70);

// see if it's time to animate;

frameCount++;

if(frameCount > frameDelay)

{

frameCount = 0;

// update the animation frame

currentFrame +=animationDirection;

if (currentFrame > totalFrames -1)

{

currentFrame = 0;

pos.x = rand.nextInt(SCREENWIDTH - 128);

pos.y = rand.nextInt(SCREENHEIGHT - 128);

}

else if(currentFrame < 0)

{

currentFrame = totalFrames - 1;

}

}

repaint();

}

public void paint(Graphics g)

{

// draw the back buffer to the screen

g.drawImage(backbuffer, 0, 0, this);

}

// draw a single frame of animation

public void drawFrame(Image source, Graphics2D dest,

int x, int y, int cols, int frame, int width, int height)

{

int fx = (frame % cols) * width;

int fy = (frame / cols) * height;

dest.drawImage(source, x, y, x+width, y+height, fx, fy, fx+width, fy+height, this);

}

}