109 lines
2.4 KiB
Java
109 lines
2.4 KiB
Java
Fade an Image
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import java.applet.*;
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import java.awt.*;
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import java.awt.image.*;
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import java.net.*;
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public class FadeImage extends Applet {
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Image img, faded;
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int level, sign;
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MediaTracker tracker;
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AlphaFilter f;
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FilteredImageSource fis;
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public void init() {
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level = 0;
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sign = 15;
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tracker = new MediaTracker(this);
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try {
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img = getImage(new URL(getDocumentBase(), "gumby.gif"));
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tracker.addImage(img,0);
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tracker.waitForID(0);
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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f = new AlphaFilter();
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f.setLevel(level);
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fis = new FilteredImageSource(img.getSource(), f) ;
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FadeThread ft = new FadeThread();
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ft.delayedFading(this, 20);
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ft.start();
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}
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public void paint(Graphics g) {
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if (faded != null) {
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g.drawImage(faded,0,0,this);
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}
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}
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public void fadeIt() {
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Graphics g = this.getGraphics();
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level += sign;
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if (level < 0) {
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level=0;
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sign = sign * -1;
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}
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if (level > 255) {
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level=255;
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sign = sign * -1;
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try {
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Thread.sleep(1000);
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}
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catch (Exception e) {}
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}
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f.setLevel(level);
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if (faded != null) faded.flush();
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faded = this.createImage(fis);
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tracker.addImage(faded,0);
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try {
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tracker.waitForID(0);
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}
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catch (Exception ex) {
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ex.printStackTrace();
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}
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repaint();
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}
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class FadeThread extends Thread {
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FadeImage fadeApplet;
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int delay;
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public void delayedFading(FadeImage f, int delay) {
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this.fadeApplet = f;
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this.delay = delay;
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}
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public void run() {
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while (true) {
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try {
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sleep(delay);
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fadeApplet.fadeIt();
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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}
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class AlphaFilter extends RGBImageFilter {
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private int level;
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public AlphaFilter() {
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canFilterIndexColorModel = true;
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}
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public void setLevel(int lev) {
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level = lev;
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}
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public int filterRGB(int x, int y, int rgb) {
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int a = level * 0x01000000;
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return (rgb & 0x00ffffff) | a;
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}
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}
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}
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