1    /* 
2     * This interpreter is intended to paint different colored dots in a window. 
3     * 
4     * The commands that the interpreter can recognize and respond to are: 
5     * - BLUE: paint a blue dot 
6     * - RED: paint a red dot 
7     * - GREEN: paint a green dot 
8     * - YELLOW: paint a yellow dot 
9     * - HELP: show a list of the commands in a dialog message box 
10    * - EXIT: terminate the program 
11    */
12   
13   package interpreters;
14   
15   import painter.SPainter;
16   import shapes.SCircle;
17   
18   import javax.swing.*;
19   import java.awt.*;
20   
21   public class Interpreter3 {
22   
23       private void interpreter() {
24   
25           // CREATE OBJECTS TO THINK WITH
26           SPainter goku = new SPainter("Dot Thing", 400, 400);
27           goku.setScreenLocation(0, 0);
28           SCircle dot = new SCircle(180);
29   
30           // REPEATEDLY TAKE A COMMAND FROM AN INPUT DIALOG BOX AND INTERPRET IT
31           while (true) {
32               String command = JOptionPane.showInputDialog(null, "Command?");
33               if ( command == null) { command = "exit"; } // user clicked on Cancel
34               if ( command.equalsIgnoreCase("blue")) {
35                   goku.setColor(Color.BLUE);
36                   goku.paint(dot);
37               } else if ( command.equalsIgnoreCase("red")) {
38                   goku.setColor(Color.RED);
39                   goku.paint(dot);
40               } else if ( command.equalsIgnoreCase("green")) {
41                   goku.setColor(Color.GREEN);
42                   goku.paint(dot);
43               } else if ( command.equalsIgnoreCase("yellow")) {
44                   goku.setColor(Color.YELLOW);
45                   goku.paint(dot);
46               } else if ( command.equalsIgnoreCase("random") ) {
47                   goku.setColor(randomColor());
48                   goku.paint(dot);
49               } else if (command.equalsIgnoreCase("help")) {
50                   JOptionPane.showMessageDialog(null, "Valid commands are: "
51                           + "RED | BLUE | GREEN | YELLOW | HELP | EXIT ");
52               } else if (command.equalsIgnoreCase("exit")) {
53                   goku.end();
54                   System.out.println("Thank you for viewing the dots ...");
55                   break;
56               } else {
57                   JOptionPane.showMessageDialog(null, "unrecognizable command: "
58                           + command.toUpperCase());
59               }
60           }
61       }
62   
63       private Color randomColor() {
64           int rv = (int)(Math.random()*256);
65           int gv = (int)(Math.random()*256);
66           int bv = (int)(Math.random()*256);
67           return new Color(rv,gv,bv);
68       }
69   
70       // INFRASTRUCTURE FOR SOME SIMPLE PAINTING
71   
72       public Interpreter3() {
73           interpreter();
74       }
75   
76       public static void main(String[] args) {
77           SwingUtilities.invokeLater(new Runnable() {
78               public void run() {
79                   new Interpreter3();
80               }
81           });
82       }
83   
84   }
85   
86