HW 2 Solution

Here is my solution to HW 2.

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;


public class Dice extends JPanel{

 /** The number the dice is showing. 0 for nothing */
 public int number;

 /** The radius of the dots in the dice. */
 public static final int RADIUS = 10;

 /** Draw the dice. 
  *  50,50       */
 public void paintComponent(Graphics g) {
  int height = getHeight();
  g.setColor(Color.black);
  g.drawRect(50, 50, 200, 200); //A 200x200 square offset by 50,50.
  switch (number) {
  case 0:
   break;
  case 5: //compiler will optimize these
   g.drawOval(100-RADIUS, 100-RADIUS, RADIUS*2, RADIUS*2); //top left
   g.drawOval(200-RADIUS, 200-RADIUS, RADIUS*2, RADIUS*2); //bottom right
  case 3:
   g.drawOval(200-RADIUS, 100-RADIUS, RADIUS*2, RADIUS*2); //top right
   g.drawOval(100-RADIUS, 200-RADIUS, RADIUS*2, RADIUS*2); //bottom left
  case 1:
   g.drawOval(150-RADIUS, 150-RADIUS, RADIUS*2, RADIUS*2); //center
   break;
  case 6:
   g.drawOval(100-RADIUS, 150-RADIUS, RADIUS*2, RADIUS*2); //center left
   g.drawOval(200-RADIUS, 150-RADIUS, RADIUS*2, RADIUS*2); //center right
  case 4:
   g.drawOval(100-RADIUS, 100-RADIUS, RADIUS*2, RADIUS*2); //top left
   g.drawOval(200-RADIUS, 200-RADIUS, RADIUS*2, RADIUS*2); //bottom right
  case 2:
   g.drawOval(200-RADIUS, 100-RADIUS, RADIUS*2, RADIUS*2); //top right
   g.drawOval(100-RADIUS, 200-RADIUS, RADIUS*2, RADIUS*2); //bottom left
   break;
  }
 }


 /**
  * @param args are ignored
  */
 public static void main(String[] args) {
  JFrame frame = new JFrame("Roll Them Bones");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  Dice panel = new Dice();
  frame.add(panel);
  frame.setSize(300, 300); //create a window that is 300px horizontally by 200px vertically.
  frame.setVisible(true);
  do {
   try {
    panel.number = Integer.parseInt(JOptionPane.showInputDialog("Enter number for the dice, or 0 to quit:"));
    frame.repaint(); //don't forget to re-paint it!
   } catch (NumberFormatException e) { //if the user types in something other than an integer, or clicks "cancel"
    System.exit(0); 

   }
  }
  while (panel.number != 0);
  System.exit(0); //without this the program won't end, cse its a GUI program.
 }
}