java 透明图片的实现（applet）

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.image.*;

public class applet6 extends Applet {
	MediaTracker mt;

	Image img = null;
	Image img2 = null;
	Image im = null;
	Image im2 = null;
	Image im3 = null;

	ImageFilter imgf = null;

	FilteredImageSource fis = null;

	public void init() {
		this.setBackground(new Color(244,223,223));
		
		img = this.getImage(this.getCodeBase(), "123.jpg");
		img2 = this.getImage(this.getCodeBase(), "234.jpg");
		mt = new MediaTracker(this);
		
		/**/
        int w = 100;
        int h = 100;
        int alpha = 0;
        int pix[] = new int[w * h];
        int index = 0;
        for (int y = 0; y < h; y++) {
            int red = (y * 255) / (h - 1);
            for (int x = 0; x < w; x++) {
                int blue = (x * 255) / (w - 1);
                pix[index++] = alpha << 24 | (255 << 24) | (red << 16) | blue;
            }
        }
        im3 = createImage(new MemoryImageSource(w, h, pix, 0, w));
		/**/
		
		mt.addImage(img, 0);
		try {
			mt.waitForAll(0);
		} catch (Exception ex) {
			System.err.println(ex.toString());
		}
		im = this.createImage(100, 100);// 建立新的图片，用于输入文字，以便接下来进行透明处理
		Graphics g2 = im.getGraphics();
		g2.setFont(new Font("宋体", Font.BOLD, 15));
		g2.drawString("半透明文字 可耕地可耕地可耕地", 1, 30);
		
		imgf = new myImage(100, 100, 120);// 调用自定义类进行对象构造
		fis = new FilteredImageSource(img2.getSource(), imgf);// 对图象的源（图象生产者）进行过滤处理，构造出FilteredImageSource对象实例
		im2 = this.createImage(fis);// 通过FilteredImageSource实例生成Image
		
//		 createImage(new MemoryImageSource(this.m, this.n, new DirectColorModel(24, 16711680, 65280, 255), localObject4, 0, this.m));
		

		
		imgf = new myImage(100, 100, 100);// 调用自定义类进行对象构造
		fis = new FilteredImageSource(im.getSource(), imgf);// 对图象的源（图象生产者）进行过滤处理，构造出FilteredImageSource对象实例
		im = this.createImage(fis);// 通过FilteredImageSource实例生成Image
		
		imgf = new myImage(100, 100, 100);// 调用自定义类进行对象构造
		fis = new FilteredImageSource(im3.getSource(), imgf);// 对图象的源（图象生产者）进行过滤处理，构造出FilteredImageSource对象实例
		im3 = this.createImage(fis);// 通过FilteredImageSource实例生成Image
	}

	public void paint(Graphics g) {
		g.drawImage(img, 0, 0, this);// 画出图片
//		g.drawImage(im, 0, 0, this);// 添加半透明文字
		g.drawImage(im2, 0, 0, this);// 添加半透明图片
		g.drawImage(im3, 140, 0, this);// 添加半透明图片
	}
	
	public void destroy(){
		System.gc();
	}
}

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.MemoryImageSource;
import java.util.Random;


public class appletImg extends Applet {
    int pixels[];
    MemoryImageSource source;
    Image image = null;
    
    public void init() {
        int width = 50;
        int height = 50;
        int size = width * height;
        pixels = new int[size];

        int value = getBackground().getRGB();
        for (int i = 0; i < size; i++) {
            pixels[i] = value;
        }

        source = new MemoryImageSource(width, height, pixels, 0, width);
        source.setAnimated(true);
        image = createImage(source);
    }

    public void run() {
        Thread me = Thread.currentThread( );
        me.setPriority(Thread.MIN_PRIORITY);

        while (true) {
            try {
                Thread.sleep(10);
            } catch( InterruptedException e ) {
                return;
            }

            // Modify the values in the pixels array at (x, y, w, h)

            // Send the new data to the interested ImageConsumers
            source.newPixels();
        }
    }
    
	public void paint(Graphics g) {
		g.drawImage(image, 0, 0, this);
	}



}