Tutorials : Java by Example : Section 3 :

Fonts and Graphics

Animation with GIF Pictures, Sprite Animation - Con't

//Sourcecode import java.awt.*; import java.applet.*; //we have to import the image package! import java.awt.image.*; //a flicker free animation with animation phases! public class Project12 extends Applet implements Runnable { Thread runner; private Image Buffer; private Graphics gBuffer; int x, ticker=0, frame=0; Image background, dogStrip, dog[]; //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=loadImage("background.jpg"); dogStrip=loadImage("running_dog.gif"); dog = new Image[6]; extractImages(dogStrip,dog,6,100,60); } public void extractImages(Image imagestrip, Image images[],int num,int width, int height) { ImageProducer source = imagestrip.getSource(); for(int i=0; i<num; i++) { ImageFilter extractFilter=new CropImageFilter(0,i*height,width,height); ImageProducer producer = new FilteredImageSource(source,extractFilter); images[i] = createImage(producer); } } public Image loadImage(String imagename) { Image image=getImage(getDocumentBase(),imagename); MediaTracker tracker=new MediaTracker(this); tracker.addImage(image,0); try { tracker.waitForID(0); } catch(InterruptedException e){} return image; } 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() { Thread.currentThread().setPriority(Thread.MAX_PRIORITY); while(true) { //Thread sleeps for 15 milliseconds here try {runner.sleep(15);} catch (Exception e) { } //here we draw the tiled background for(int i=0;i<size().width;i+=80) for(int j=0;j<size().width;j+=80) gBuffer.drawImage(background,i,j,this); x+=3; if(x>300) x=-100; ticker++; //this sets the animation phases //you can determine the speed of the phases change here if(ticker>3) { if(frame<5) frame++; else frame=0; ticker=0; } //draws the star animation gBuffer.drawImage(dog[frame],x,45,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); } }

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