tcanvas.java

AlphaBlending图片透明效果程序是利用j2me中MIDP2.0新特性Alpha混合来实现图片透明的两种演示效果代码

/**源代码由程序员联合开发网(www.pudn.com)会员"周润发"收集、整理、重新编辑
 *Email: [e-mail]
 *QQ号：1103798882
 *欢迎大家与我联系互相交流学习 
 **/
package AlphaPackage;

import java.io.IOException;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class TCanvas extends Canvas {
	Image image,image_bg;//要处理的图片
	int argb[];
	public TCanvas() {
		super();
		try {
			image_bg=Image.createImage("/pic/rw_S_7.jpg");
			image = Image.createImage("/pic/sky.jpg");//导入图片
		} catch (IOException e) {
			e.printStackTrace();
		}
		argb = new int[image.getWidth()*image.getHeight()];
		image.getRGB(argb,0,image.getWidth(),0,0,image.getWidth(),image.getHeight());//获得图片的ARGB值
		//int temp;
		//int a= 100;//把象素的透明度都设置为100
		int a= 200;
		for(int i=0;i<argb.length;i++)
		{
			argb[i]=(a<<24) | (argb[i] & 0x00FFFFFF);// 修改最高2位的值
		}
	}

	protected void paint(Graphics g) {
		g.setColor(255, 255, 255);
        g.fillRect(0, 0, getWidth(), getHeight());//paint Canvas background white
		g.drawImage(image_bg, 0, 50, Graphics.TOP|Graphics.LEFT);	
		g.drawImage(image,0,0,Graphics.TOP|Graphics.LEFT);	
		g.drawRGB(argb,0,image.getWidth(),0,100,image.getWidth(),image.getHeight(),true);// 画象素数组
	}
}