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

Tutorials : Java by Example : Section 3 :

Section Three Contents

Flicker Free Graphics, GIF and JPEG Display

Animation with GIF Pictures, Sprite Animation

Fonts and Graphics

Animation with GIF Pictures, Sprite Animation

This applet presents nothing new, but combines the techniques of flicker free animation and the use of GIF and JPEG graphics. The background picture, which contains lots of colors, but doesn't have to be very sharp or detailled is a highly compressed JPEG, the snake a GIF with transparency index color.

//Sourcecode

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); } }

Applet Index
(sorted alphabetically)
A B C D E F G H I J K
L M N O P Q R S T U
V W X Y Z #s

The Java Source
(applets w/source code)
A B C D E F G H I J K
L M N O P Q R S T U
V W X Y Z

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