Interpreter3.java
/* 
 * This interpreter is intended to paint different colored dots in a window randomly. 
 * 
 * The commands that the interpreter can recognize and respond to are: 
 * - BLUE: paint a blue dot 
 * - RED: paint a red dot 
 * - GREEN: paint a green dot 
 * - YELLOW : paint a yellow dot 
 * - RANDOM : paint a random dot 
 * - HELP: show a list of the commands in a dialog message box 
 * - EXIT: terminate the program 
 */

package interpreters;

import java.awt.Color;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import painter.SPainter;
import shapes.SCircle;


public class Interpreter3 {

    private void interpreter(){

        // CREATS OBJECTS TO THINK WITH
        SPainter miro = new SPainter("Dot Thing", 400, 400);
        miro.setScreenLocation(0,0);
        SCircle dot = new SCircle(180);

        // REPEATEDLY TAKE A COMMAND FROM AN INPUT DIALOG BOX AND INTERPRET IT
        while (true) {
            String command = JOptionPane.showInputDialog(null,"command?");
            if ( command == null ) {command = "exit";} // user clicked on Cancel
            if ( command.equalsIgnoreCase("blue")) {
                miro.setColor(Color.BLUE);
                miro.paint(dot);
            } else if (command.equalsIgnoreCase("red")){
                miro.setColor(Color.RED);
                miro.paint(dot);
            } else if (command.equalsIgnoreCase("green")){
                miro.setColor(Color.GREEN);
                miro.paint(dot);
            } else if (command.equalsIgnoreCase("yellow")){
                miro.setColor(Color.YELLOW);
                miro.paint(dot);
            } else if (command.equalsIgnoreCase( "random")){
                miro.setColor(randomColor());
                miro.paint(dot);
            }
            else if (command.equalsIgnoreCase("help")){
                JOptionPane.showMessageDialog(null, "Valid commands are: "
                        + "RED | BLUE | GREEN | YELLOW | RANDOM | HELP | EXIT" );
            } else if (command.equalsIgnoreCase( "exit")) {
                miro.end();
                System.out.println("Thank you for viewing the dots ...");
                break;
            } else {
                JOptionPane.showMessageDialog(null, "Unrecognizable command:" + command.toUpperCase());
            }
        }
    }

    private static Color randomColor() {
        int rv = (int)(Math.random() * 256);
        int gv = (int)(Math.random() * 256);
        int bv = (int)(Math.random() * 256);
        return new Color(rv,gv,bv);
    }

    // INFRASTRUCTURE FOR SOME SIMPLE PAINTING

    public Interpreter3(){
        interpreter();
    }

    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
            public void run(){
                new Interpreter3();
            }
        });
    }
}