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代碼1。在屏幕上輸出當前鼠標所在的屏幕顏色。

import java.awt.*;

public class PickColor {

public static void main(String[] args) {

PickColor pc = new PickColor();

Color color = pc.pickColor();

System.out.println("color = "+color);

}

public Color pickColor() {

Color pixel = new Color(0,0,0);

Robot robot = null;

Point mousepoint;

int R,G,B;

// MouseInfo mouseinfo = new MouseInfo();

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();

return pixel;

}

}

代碼2。使用一個GUI，輸出當前鼠標所在的屏幕顏色，并改變GUI的背景色。

// create by kin 2004/10/24 refer to http://dev.csdn.net/article/44/44529.shtm

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

public class PickColor2 extends JFrame {

public static void main(String[] args) {

PickColor2 pc = new PickColor2();

//Color color = pc.pickColor();

//System.out.println("color = "+color);

}

public PickColor2 () {

super("Pick Color");

setSize(200,200);

JPanel p =new JPanel();

getContentPane().add(p);

// this mouse listener only is limited in the java desktop region

p.addMouseMotionListener(new PickColorMouesMotionListener(p));

// this thread is really effected!

new PickColorThread(p).start();

setVisible(true);

}

/**Mouse Motion Listener,when mouse are moving, then set corresping screens color to the JPanels background Color. */

class PickColorMouesMotionListener extends MouseMotionAdapter {

private JPanel p = null;

PickColorMouesMotionListener(JPanel p) {

this.p = p;

}

public void mouseMoved(MouseEvent e) {

Color c = pickColor();

this.p.setBackground(c);

//System.out.println (c);

}

}

class PickColorThread extends Thread {

private JPanel p = null;

PickColorThread(JPanel p){

this.p=p;

}

public void run () {

while (true) {

try {

Thread.currentThread().sleep(10);

Color c = pickColor();

this.p.setBackground(c);

// try change the foreground when background s r <= 50 or g <= 50 or b <= 50

Graphics g = p.getGraphics ();

if (c.getRed() <=50 || c.getGreen() <= 50 || c.getBlue() <= 50) {

g.setColor(Color.WHITE);

} else {

g.setColor(Color.BLACK);

}

g.drawString(c.toString(),0,100);

g = null;

//System.out.println (c);

} catch (InterruptedException e) {

e.printStackTrace();

System.exit(1);

}

}

}

}

/**Get Screen Color*/

public Color pickColor() {

Color pixel = new Color(0,0,0);

Robot robot = null;

Point mousepoint;

int R,G,B;

// MouseInfo mouseinfo = new MouseInfo();

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();

return pixel;

}

}

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