The Java Boutique: Java Tutorial: Java by Example: Fonts and Graphics

import java.awt.*; import java.applet.*; //a flicker free animation with images! //the GIF snail with transparent color moves over the JPEG grass public class Project11 extends Applet implements Runnable { Thread runner; private Image Buffer; private Graphics gBuffer; Image background, snail; //Init is called first, do any initialisation here public void init() { //create graphics buffer, the size of the applet Buffer=createImage(size().width,size().height); gBuffer=Buffer.getGraphics(); background=getImage(getCodeBase(),"grass.jpg"); snail=getImage(getCodeBase(),"snail.gif"); } public void start() { if (runner == null) { runner = new Thread (this); runner.start(); } } public void stop() { if (runner != null) { runner.stop(); runner = null; } } public void run() { while(true) { //Thread sleeps for 15 milliseconds here try {runner.sleep(15);} catch (Exception e) { } gBuffer.drawImage(background,0,0,this); int x; //move the snail from left to right... x++; //if it moves past the right border, //let it reappear on the left border if(x>size().width) x=-125; gBuffer.drawImage(snail,x,150,this); repaint(); } } //is needed to avoid erasing the background by Java public void update(Graphics g) { paint(g); } public void paint(Graphics g) { g.drawImage (Buffer,0,0, this); } }