java獲得鼠標所在位置的圖像的rgb值


import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*; 

public class GetRectPixel {

public GetRectPixel() {
ImageHolder holder = new ImageHolder();
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.add(holder);
frame.getContentPane().add(panel);
frame.setSize(400,400);
frame.setVisible(true);
}

public static void main(String[] args) { 
GetPixel getpixel = new GetPixel(); 
}
}

class ImageHolder extends Canvas{
BufferedImage bi ;//創(chuàng)建緩沖區(qū)圖像
Image image; 
MediaTracker mt ;//創(chuàng)建媒體跟蹤器
int imageWidth; //圖像寬度
int imageHeight;//圖像高度

public ImageHolder() {
mt =new MediaTracker(this); 

try{
image = Toolkit.getDefaultToolkit().createImage("gigi3.jpg");
mt.addImage(image,0);
mt.waitForAll();//等待直到所有的圖像都以完成裝填
imageWidth =  image.getWidth(this);//獲得單前圖像的寬度
imageHeight = image.getHeight(this);//獲得當前圖像的長度
}
catch(Exception e){}
bi = new BufferedImage(imageWidth,imageHeight,BufferedImage.TYPE_INT_RGB);
addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent me){
//獲得鼠標當前位置的橫，縱坐標
int mouseX = (int)me.getPoint().getX();
int mouseY =(int) me.getPoint().getY();
//獲得該處的rgb值
getPixel(mouseX,mouseY);
}
});

setSize(imageWidth,imageHeight);
}

public void paint(Graphics g){
int xCenter = (getSize().width / 2) - (imageWidth / 2);
int yCenter = (getSize().height / 2) - (imageHeight / 2);
g.drawImage(image, xCenter, yCenter, imageWidth, imageHeight, this);
}

public void getPixel(int x,int y){
  //獲得ImageHolder的色彩模型
  ColorModel cm = this.getColorModel();
  //把象素形式的色彩組件（ImageHolder）以rgb的形式返回。
  int rgb = cm.getRGB(x*y);
  //分別獲得其r,g,b值。
  int red = (rgb>>16)&0xff ;
  int green = (rgb>>8)&0xff ;
  int blue = (rgb)&0xff ;
  System.out.println( "("+red+","+green+ ","+blue+ ")");
 }
} 


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