Go语言视频零基础入门到精通

javalearner

代码1。在屏幕上输出当前鼠标所在的屏幕颜色。  
   

1. 
   
2. import java.awt.*;
   
3. public class PickColor {
   
4.   public static void main(String[] args) {
   
5.     PickColor pc = new PickColor();
   
6.     Color color = pc.pickColor();
   
7.     System.out.println("color = "+color);
   
8. }
   
9.   Color pickColor() {
   
10.     Color pixel = new Color(0,0,0);
    
11.     Robot robot = null;
    
12.     Point mousepoint;
    
13.     int R,G,B;
    
14.    
    
15.     try {
    
16.       robot = new Robot();
    
17.     } catch (AWTException e) {
    
18.         e.printStackTrace();
    
19.         System.exit(1);
    
20.      }
    
21.      mousepoint = MouseInfo.getPointerInfo().getLocation();
    
22.      pixel = robot.getPixelColor(mousepoint.x,mousepoint.y);
    
23.      R = pixel.getRed();
    
24.      G = pixel.getGreen();
    
25.       return pixel;
    
26.    }
    
27. }
    
28. 运行结果:
30. C:java>java  PickColor
31. color = java.awt.Color[r=0,g=0,b=0]                        

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   代码2。使用一个GUI，输出当前鼠标所在的屏幕颜色，并改变GUI的背景色。

1. import java.awt.*;
   
2. import java.awt.event.*;
   
3. import javax.swing.*;
   
4. import javax.swing.event.*;
   
5. public class PickColor2 extends JFrame {
   
6.   public static void main(String[] args) {
   
7.   PickColor2 pc = new PickColor2();
   
8. 
   
9. }
   
10. public PickColor2 () {
    
11.   super("Pick Color");
    
12.   setSize(200,200);
    
13.   JPanel p =new JPanel();
    
14.   getContentPane().add(p);
    
15.   // this mouse listener only is limited in the java desktop region
    
16.   p.addMouseMotionListener(new PickColorMouesMotionListener(p));
    
17.   // this thread is really effected!
    
18.   new PickColorThread(p).start();
    
19.   setVisible(true);
    
20. }
    
21. /**Mouse Motion Listener,when mouse are moving, then set corresping screens color to the JPanels background Color. */
    
22. class PickColorMouesMotionListener extends MouseMotionAdapter { //内部类
    
23.   private JPanel p = null;
    
24.   PickColorMouesMotionListener(JPanel p) {
    
25.     this.p = p;
    
26.   }
    
27.   public void mouseMoved(MouseEvent e) {
    
28.    Color c = pickColor();
    
29.    this.p.setBackground(c);
    
30.    //System.out.println (c);
    
31.   }
    
32. }
    
33. class PickColorThread extends Thread {
    
34.    private JPanel p = null;
    
35.    PickColorThread(JPanel p){
    
36.       this.p=p;
    
37.     }
    
38.    public void run () {
    
39.      while (true) {
    
40.      try {
    
41.         Thread.currentThread().sleep(10);
    
42.         Color c = pickColor();
    
43.          this.p.setBackground(c);
    
44.         // try change the foreground when background s r <= 50 or g <= 50 or b <= 50
    
45.          Graphics g = p.getGraphics ();
    
46.         if (c.getRed() <=50 || c.getGreen() <= 50 || c.getBlue() <= 50) {
    
47.            g.setColor(Color.WHITE);
    
48.         } else {
    
49.            g.setColor(Color.BLACK);
    
50.         }
    
51.            g.drawString(c.toString(),0,100);
    
52.            g = null;
    
53.            //System.out.println (c);
    
54.      } catch (InterruptedException e) {
    
55.              e.printStackTrace();
    
56.              System.exit(1);
    
57.      }
    
58.     }
    
59.   }
    
60. }
    
61. /**Get Screen Color*/
    
62. public Color pickColor() {
    
63.     Color pixel = new Color(0,0,0);
    
64.     Robot robot = null;
    
65.     Point mousepoint;
    
66.     int R,G,B;
    
67.     try {
    
68.        robot = new Robot();
    
69.      } catch (AWTException e) {
    
70.        e.printStackTrace();
    
71.        System.exit(1);
    
72.     }
    
73.     mousepoint = MouseInfo.getPointerInfo().getLocation();
    
74.     pixel = robot.getPixelColor(mousepoint.x,mousepoint.y);
    
75.     R = pixel.getRed();
    
76.     G = pixel.getGreen();
    
77.     return pixel;
    
78. }
    
79. }
    

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源码下载：http://file.javaxxz.com/2014/10/1/170417781.zip