package week1;

/*
Shows a pair of dice that are rolled when the user clicks on a "Roll"
button.  It is assumed that the applet is sized so that the canvas
on which the dice are drawn is about 100 by 100 pixels.  A clicking
sound is played when the dice are rolled.

This file defines two classes:  A main applet class, DiceWithButton,
and a canvas class, DiceCanvas.  The DiceCanvas class is not public
and is not meant to be used outside this file.
*/


import java.awt.*;
import java.awt.event.*;
import java.applet.*;


public class DiceWithButton extends Applet implements ActionListener{

    // This applet class sets things up, and it responds to clicks
    // on the Roll button by telling the DiceCanvas to roll the dice.
    
DiceCanvas dice;   // A canvas that displays the dice.
                   //   (This has to be an instance variable 
                   //    because I use it in the actionPerformed
                   //    method.)


public void init() {

       // Initialize the applet by setting its layout manager to
       // be a BorderLayout and creating the two components that
       // are shown on the applet.

   setBackground(Color.blue);
   setLayout(new BorderLayout(2,2));  // Use BorderLayout with
                                      //   2 pixels between components.

   dice = new DiceCanvas();             // Canvas to show the dice.

   add(dice, BorderLayout.CENTER);   // Dice go in large, center
                                     //   area of the applet.
   
   Button rollBttn = new Button("Roll!");   // The roll button.
   rollBttn.addActionListener(this);   // Applet listens to this button.
   rollBttn.setBackground(Color.lightGray);
   
   add(rollBttn, BorderLayout.SOUTH);  // The button occupies a strip
                                       //   along the bottom.
}  // end init()


public Insets getInsets() {
      // leave a 2-pixel border around the edges of the applet.
   return new Insets(2,2,2,2);
}


public void actionPerformed(ActionEvent evt) {
      // Respond to a click on the "Roll" button by rolling the dice
      // and playing a sound.
   dice.roll();
   play(getCodeBase(), "click.au");
}      

}  // end class DiceWithButton


//---------------------------------------------------------------


class DiceCanvas extends Canvas {

    // This canvas class displays the dice.  The dice are
    // rolled by calling this class's roll() method.

int die1 = 4;  // The values shown on the dice.
int die2 = 3;


DiceCanvas() {
       // Constructor.  To initialize the canvas, set a 
       // light blue background color. 
    setBackground( new Color(200,200,250) );
}


public void paint(Graphics g) {
       // The paint method draws the two dice.
   drawDie(g, die1, 10, 10);
   drawDie(g, die2, 55, 55);
}


void drawDie(Graphics g, int val, int x, int y) {
      // Draw a die with upper left corner at (x,y).  The die is
      // 3 5 by 35 pixels in size.  The val parameter gives the
      // value showing on the die (that is, the number of dots).
   g.setColor(Color.white);
   g.fillRect(x, y, 35, 35);
   g.setColor(Color.black);
   g.drawRect(x, y, 34, 34);
   if (val > 1)  // upper left dot
      g.fillOval(x+3, y+3, 9, 9);
   if (val > 3)  // upper right dot
      g.fillOval(x+23, y+3, 9, 9);
   if (val == 6) // middle left dot
      g.fillOval(x+3, y+13, 9, 9);
   if (val % 2 == 1) // middle dot (for odd-numbered val's)
      g.fillOval(x+13, y+13, 9, 9);
   if (val == 6) // middle right dot
      g.fillOval(x+23, y+13, 9, 9);
   if (val > 3)  // bottom left dot
      g.fillOval(x+3, y+23, 9, 9);
   if (val > 1)  // bottom right dot
      g.fillOval(x+23, y+23, 9,9);
}


void roll() {
      // Roll the dice by randomizing their values.  Tell the
      // system to repaint the applet, to show the new values.
      // Also, play a clicking sound to give the user more feedback.
   die1 = (int)(Math.random()*6) + 1;
   die2 = (int)(Math.random()*6) + 1;
   repaint();
}


} // end class DiceCanvas