import javax.swing.*;
   import java.awt.*;
   import java.lang.Math;

    public class Memory extends java.applet.Applet
   {
      private int xMouse;
      private int yMouse;
      private boolean mouseClicked = false;
      private boolean firstRun = true;
		private static final int WIDTH = 100;
      //add the rest of your instance variables here
   	
      
   /*Sets the background of your memory board to black*/
       public void init() 
      {
         setBackground(Color.BLACK);  	
      } 	
   	/*This is main in java applets
   	You may need to add (not change) a couple things in this method
   	*/
       public void paint(Graphics canvas)
      {
         if(firstRun) //for the first run we need to build our random board
         {
            buildBoard(4);
            firstRun = false;
         } 
         else // once our board is built we will display the game
         {
            displayGame(canvas);
            if (mouseClicked) // if the mouse has been clicked
            {
               displayHit(canvas);//find which box the user clicked
               mouseClicked = false;
            }
         }
      }
      
   	/*
   	DO NOT change this method
   	determins if the mouse has been pressed
   	sets x and y Mouse to the location of the mouse arrow
   	redraws the image
   	*/
       public boolean mouseDown(Event e, int x, int y ) 
      {
         mouseClicked = true; 
         xMouse = x;
         yMouse = y;
         repaint();
         return true;
      }
   	
   	/*DO NOT change this method
   	redraws the scene
   	*/
       public void update ( Graphics g ) 
      {
         paint(g);
      }
   
   	/*
   	pre: none
   	post: build an array that holds the memory vales for a board of size x size
   	the board will hold two of each int from 0 to size randomly placed in the array
   	*/
       public void buildBoard(int s)
      {

      }
      
       public void displayGame(Graphics canvas)
      {
         canvas.setColor(Color.WHITE);
      	
         for(int i =0; i < 400; i+= WIDTH)
            for(int j = 0; j < 400; j+= WIDTH)
               canvas.drawRect(i, j, WIDTH, WIDTH);
      }

		/*
		Pre: xMouse and yMouse have been initialized
		Post: A circle is displayed in the correct box on the screen
		Currenlty the circle is displayed at the mouse location
		*/
       public void displayHit(Graphics g)
      {
      	g.setColor(Color.WHITE);
         g.fillOval(xMouse, yMouse, 40, 40);
      }
   	
   	
   }