java语言的科学与艺术-编程练习---创建简单的GUI 

 1 import acm.graphics.*;
 2 import acm.program.*;
 3 import java.awt.*;
 4 import java.awt.event.*;
 5 import javax.swing.*;
 6 /**
 7  * This program creates a five-pointed star every time the 
 8  * user clicks the mouse on the canvas.
 9  * @author Administrator
10  *
11  */
12 public class DrawStarMap extends GraphicsProgram {
13     /* Initializes the mouse listeners */
14     public void init(){
15         add(new JButton("Clear"), SOUTH);
16         fillCheckBox = new JCheckBox("Filled");
17         fillCheckBox.setSelected(true);
18         add(fillCheckBox, SOUTH);
19         
20         smallButton = new JRadioButton("Small");
21         mediumButton = new JRadioButton("Medium");
22         largeButton = new JRadioButton("Large");
23         ButtonGroup sizeGroup = new ButtonGroup();
24         sizeGroup.add(smallButton);
25         sizeGroup.add(mediumButton);
26         sizeGroup.add(largeButton);
27         mediumButton.setSelected(true);
28         add(smallButton, SOUTH);
29         add(mediumButton, SOUTH);
30         add(largeButton, SOUTH);
31         
32         addActionListeners();
33         addMouseListeners();
34     }
35     public double getCurrentSize(){
36         if (smallButton.isSelected()) return SMALL_SIZE;
37         if (largeButton.isSelected()) return LARGE_SIZE;
38         return MEDIUM_SIZE;
39     }
40     public void actionPerformed(ActionEvent e){
41         if (e.getActionCommand().equals("Clear")) removeAll();
42     }
43     /* Called whenever the user clicks the mouse */
44     public void mouseClicked(MouseEvent e){
45         GStar star = new GStar(getCurrentSize());
46         star.setFilled(fillCheckBox.isSelected());
47         add(star, e.getX(), e.getY());
48     }
49     /* Private constants */
50     private static final double SMALL_SIZE = 10.0;
51     private static final double MEDIUM_SIZE = 20.0;
52     private static final double LARGE_SIZE = 30.0;
53     
54     private JCheckBox fillCheckBox;
55     private JRadioButton smallButton, mediumButton, largeButton;
56 }

posted on 2012-12-17 20:10  mybluecode  阅读(254)  评论(0)  编辑  收藏  举报