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MovingSurface.java

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.TexturePaint;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;


public class MovingSurface {
	public static final int UP=0;
	public static final int DOWN=1;
	public static final int LEFT=2;
	public static final int RIGHT=3;
	private Polygon p;
	private int speed,direction;
	private BufferedImage img; //the texture
	// see http://oreilly.com/catalog/java2d/chapter/ch04.html
	public MovingSurface(String graphicFileName,int speed, int direction){
		this.p=new Polygon();
		this.direction=direction;	
		this.speed=speed;
		this.img = null;
		try {
		    img = ImageIO.read(new File(graphicFileName));
		} catch (IOException e) {}
	}
    public void addPoint(int x, int y){
    		p.addPoint(x, y);
    }
    public int getWidth(){ return img.getWidth();}
    public int getHeight(){ return img.getHeight();}
	/**
	 * 
	 * @param g the Graphics object to draw on
	 * @param f the frame number used to animate img on the polygon
	 */
	public void draw(Graphics g, int f){
		Graphics2D g2=(Graphics2D)g;
		int height=img.getHeight();
		int width=img.getWidth();
		int i= speed*f % width;// presume right 
		Rectangle2D tr=new Rectangle2D.Double(i,0,width, height);//horiz
		//now check:
		if (direction==LEFT){
			i= width-(speed*f % width);//left
		} else if (direction==DOWN){
			i= speed*f % img.getHeight();//down
			tr=new Rectangle2D.Double(0,i,width, height);//vert
		} else if (direction==UP){
			i= height-(speed*f % height);//up
			tr=new Rectangle2D.Double(0,i,width, height);//vert
		}		
		TexturePaint tp=new TexturePaint(img,tr);
		g2.setPaint(tp);		
		g2.fill(p);
	}

}

CanyonAnimation.java

import java.awt.event.*; 
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.applet.*;
import java.awt.*;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.*;

public class CanyonAnimation extends Applet implements ActionListener
{
    Timer timer;
    int frame, lastFrame;
    Image virtualMem;
    BufferedImage img;
    Graphics gBuffer;
    Button startButton;
    MovingSurface leftWall,rtWall,bottom,bottomRt;
    //AudioClip racingSound;

	public void init(){
		int width=getWidth();
		int height=getHeight();
		timer = new Timer(1, this);
		frame=0;
		lastFrame=100;

		virtualMem = createImage(width,height);
        gBuffer = virtualMem.getGraphics();
        gBuffer.setColor(Color.white);
        gBuffer.fillRect(0,0,width,height);

        gBuffer.setColor(Color.black);
        gBuffer.drawLine(width-10,height-frame,width+10,height-frame);

        startButton= new Button("Start");
        //the class is its own button listener
        startButton.addActionListener (this);
        add(startButton);   

        //Audio
       //racingSound = getAudioClip(getDocumentBase(), "racing.wav");
        //Initialize side polygons
        leftWall=new MovingSurface("sand1.gif", -15, MovingSurface.LEFT);
		leftWall.addPoint(0,0);
		leftWall.addPoint(300, 100);
		leftWall.addPoint(300, 500);
		leftWall.addPoint(0, 600);
		rtWall=new MovingSurface("sand2.gif", 15, MovingSurface.RIGHT);
		rtWall.addPoint(800,0);
		rtWall.addPoint(500, 100);
		rtWall.addPoint(500, 500);
		rtWall.addPoint(800, 600);
		//lastFrame=rtWall.getWidth();
		bottom=new MovingSurface("sand3.gif", 10, MovingSurface.DOWN);
		bottom.addPoint(0,600);
		bottom.addPoint(300,400);
		bottom.addPoint(500, 400);
		bottom.addPoint(800, 600);
	}
	public void paint(Graphics g){
		int width=getWidth();
		int height=getHeight();
		//blue sky
        gBuffer.setColor(Color.white);
        gBuffer.fillRect(0,0,width,height); 
        //draw sides

        //cover sides with sky and road
        leftWall.draw(gBuffer, frame);
        rtWall.draw(gBuffer, frame);
        bottom.draw(gBuffer, frame);
        gBuffer.setColor(Color.black);
        int deltaX=3*frame;
        int y=height/2+frame*frame/5;
        gBuffer.fillRect(width/2-deltaX,y,deltaX,deltaX);

		//Now we send the result to the screen
        g.drawImage(virtualMem,0,0,this);
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		Object source = e.getSource();
        if (source == timer) 
        {
            if (frame < lastFrame) {
                frame++;
            }
            else {
                frame=0;
            }
        }
        else {
            //restart button pressed
              frame=0;
              if (timer.isRunning()) {
                  timer.stop();
                  startButton.setLabel("Start");
               }
               else {
                   timer.start();
                   startButton.setLabel("Stop");  
                }
        }
        repaint();	
	}	

     public void update(Graphics g)
     {
        paint(g); //get rid of flicker with this method
     }
}