c.gridx=2;
c.gridy=3;
c.gridwidth=1;
explain=new JButton("说明");
explain.addActionListener(this);
gbLayout.setConstraints(explain,c);
contentPane.add(explain);

c.gridx=0;
c.gridy=4;
c.gridwidth=3;
mouse_track_label=new JLabel("鼠标轨迹:");
gbLayout.setConstraints(mouse_track_label,c);
contentPane.add(mouse_track_label);

this.setTitle("Java取色器");
this.setAlwaysOnTop(true);
this.setSize(250,150);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}

public static void main(String args[]){
GetColor gc=new GetColor();
}

//接收按钮事件
public void actionPerformed(ActionEvent ae){
if(ae.getSource()==start){
doStart();
} else if(ae.getSource()==explain){
doExplain();
}
}

//更新保存当前取色,即确定取色
private void updates(Color bg){
jpcolor.removeAll();
jpcolor.setBackground(bg);
this.setResizable(true);
this.setCursor(Cursor.DEFAULT_CURSOR);
SwingUtilities.updateComponentTreeUI(this);
}

//开始取色按钮事件对应的方法
private void doStart(){
try{
Robot ro=new Robot();
Toolkit tk=Toolkit.getDefaultToolkit();
Dimension di=tk.getScreenSize();
Rectangle rec=new Rectangle(0,0,di.width,di.height);
BufferedImage bi=ro.createScreenCapture(rec);
JFrame jf=new JFrame();
jf.getContentPane().add(new Temp(jf,bi,di.width,di.height));
jf.setUndecorated(true);
jf.setSize(di);
jf.setVisible(true);
this.setResizable(false);
}catch(Exception exe){
exe.printStackTrace();
}
}

// 说明信息
private void doExplain(){
String copyright;
copyright="Java屏幕取色器:\n单击取色按钮开始取色,在程序窗口以外再次单击鼠标以确定取色!\n"+"由缘吇弹转载开源";
copyright=copyright+" 愿与您共同学习,共同进步\n"+"欢迎访问我的主页:http://hi.baidu.com/yzidan\n";
JOptionPane.showMessageDialog(null,copyright);
}

//一个暂时类，用于显示当前的屏幕图像
private class Temp extends JPanel implements MouseListener,MouseMotionListener{
private BufferedImage bi;
private int width,height;
private JFrame jf;

public Temp(JFrame jf,BufferedImage bi,int width,int height){
this.jf=jf;
this.bi=bi;
this.width=width;
this.height=height;
this.addMouseListener(this);
this.addMouseMotionListener(this);
}

public void paintComponent(Graphics g){
jf.setCursor(Cursor.CROSSHAIR_CURSOR);
g.drawImage(bi,0,0,width,height,this);
}

public void mouseMoved(MouseEvent me){
pickColor();
}

// 获取鼠标指针当前颜色并显示
public Color pickColor() {
Color pixel = new Color(0,0,0);
Robot robot = null;
Point mousepoint;
int R,G,B;
try {
robot = new Robot();
} catch (AWTException e) {
e.printStackTrace();
System.exit(1);
}
mousepoint = MouseInfo.getPointerInfo().getLocation();
pixel = robot.getPixelColor(mousepoint.x,mousepoint.y);
R = pixel.getRed();
G = pixel.getGreen();
B = pixel.getBlue();
jpcolor.setBackground(pixel);
RGB_jtf.setText("R="+R+",G="+G+",B="+B);
Hex_jtf.setText("#"+Integer.toHexString(R)+Integer.toHexString(G)+Integer.toHexString(B));
mouse_track_label.setText("鼠标轨迹:x="+mousepoint.x+",y="+mousepoint.y);
return pixel;
}

public void mouseExited(MouseEvent me){

}

public void mouseEntered(MouseEvent me){

}

public void mouseDragged(MouseEvent me){

}

public void mousePressed(MouseEvent me){

}

public void mouseReleased(MouseEvent me){

}