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