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: paints a randomly colored dot 
10    * - HELP: show a list of the commands in a dialog message box 
11    * - EXIT: terminate the program 
12    */
13   package interpreters;
14   
15   import java.awt.Color;
16   import javax.swing.JOptionPane;
17   import javax.swing.SwingUtilities;
18   import painter.SPainter;
19   import shapes.SCircle;
20   
21   public class Interpreter3 {
22       private void interpreter() {
23           // Create objects to "think" with.
24           SPainter gage = new SPainter("Dot Program", 400, 400);
25           gage.setScreenLocation(0, 0);
26           SCircle dot = new SCircle(180);
27   
28           // Repeatedly takes a command from an input dialog box and interpret it.
29           while (true) {
30               String command = JOptionPane.showInputDialog(null, "Command?");
31               if (command == null) {command = "exit";} // User clicks "Cancel" prompt
32               if (command.equalsIgnoreCase("blue")) {
33                   gage.setColor(Color.BLUE);
34                   gage.paint(dot);
35               } else if (command.equalsIgnoreCase("red")) {
36                   gage.setColor(Color.RED);
37                   gage.paint(dot);
38               } else if (command.equalsIgnoreCase("green")) {
39                   gage.setColor(Color.GREEN);
40                   gage.paint(dot);
41               } else if (command.equalsIgnoreCase("yellow")) {
42                   gage.setColor(Color.YELLOW);
43                   gage.paint(dot);
44               } else if (command.equalsIgnoreCase("random")) {
45                   gage.setColor(randomColor());
46                   gage.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                   gage.end();
52                   System.out.println("Thank you for viewing the dots program.");
53                   break;
54               } else {
55                   JOptionPane.showMessageDialog(null, "Unrecognizable command:"
56                           + command.toUpperCase());
57               }
58           }
59       }
60       // Creates method to select a random color.
61       private 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 simple painting.
69       public Interpreter3() {
70           interpreter();
71       }
72       public static void main(String[] args) {
73           SwingUtilities.invokeLater(new Runnable() {
74               public void run() {
75                   new Interpreter3();
76               }
77           });
78       }
79   }