java applet例子---图片像素处理

package applet;

import java.applet.Applet;
import java.awt.Event;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageProducer;
import java.awt.image.RGBImageFilter;
import java.net.MalformedURLException;
import java.net.URL;

//实现图像色素过滤功能
public class PixelProcess extends Applet {

	Image oldImage;
	Image currentImage;
	int i = 0;

	public void init() {
		
		try {
			oldImage = this
					.getImage(new URL(
							"file:///C:/Documents and Settings/All Users/Documents/My Pictures/示例图片/可爱小狗.jpg"));
		} catch (MalformedURLException e) {
			e.printStackTrace();
		}
		imageProcess();
	}
	public boolean mouseDown(Event e,int x,int y){ //重载父类方法
		i++;
		imageProcess();
		repaint();

		return true;
	}
	public void paint(Graphics g){
		g.drawImage(currentImage, 0, 0, this);
	}
	
	public synchronized boolean imageUpdate(Image m,int f,int x,int y,int w,int h){
		repaint(100);
		return true;
	}

	public synchronized void imageProcess() {

		RGBImageFilter imageFilter;
		if (i % 2 == 0) {
			imageFilter = new NonFilter();
		} else {
			imageFilter = new RGBFilter();
		}

		ImageProducer imageProducer = oldImage.getSource();
		imageProducer = new FilteredImageSource(imageProducer, imageFilter);
		currentImage = createImage(imageProducer);

	}
}



// 不做渲染
class NonFilter extends RGBImageFilter {

	public int filterRGB(int x, int y, int rgb) {
		return rgb;
	}
}

class RGBFilter extends RGBImageFilter {
	public int filterRGB(int x, int y, int rgb) {
		return (rgb & 0xff00ff00) | ((rgb & 0xff0000) >> 16)
				| ((rgb & 0xff) << 16);
	}
}

执行结果：
初始图片：


点击applet后


再次点击就会状态交替出现