import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;


/** An instance is a JPanel of size (WIDTH,HEIGHT), which
    is green or red depending on whether the sum of the
    parameters of the constructor is even or not. Clicking
    on the square produces a pink disk on it; click again
    and the pink disk goes away. The JPanel is used only
    as a graphics pane; no components are added to it.
  */
public class Square extends JPanel {
	public static final int HEIGHT= 50;  // height and 
	public static final int WIDTH=  50;  // width of square
	
	private int x, y; // Coordinates of square on board
	private boolean hasDisk= false; // = "the square has a pink disk"
	
	/** Constructor: a square at (x,y) */
	public Square(int x, int y) {
	    this.x= x; this.y= y;
		setPreferredSize(new Dimension(WIDTH,HEIGHT));
		this.addMouseListener(new MouseEvents());
	}
	
	/** paint this square with graphics g */
    public void paint(Graphics g) {
		if ((x+y)%2 == 0)
			{  g.setColor(Color.green);  }
		else
		    {  g.setColor(Color.red);  }
    	g.fillRect(0,0,WIDTH-1,HEIGHT-1);
    	 
        if (hasDisk) {
        	g.setColor(Color.pink);
        	g.fillOval(7,7,WIDTH-14,HEIGHT-14);
        }
     	g.setColor(Color.black);
        g.drawRect(0,0,WIDTH-1,HEIGHT-1);
        g.drawString("(" + x + ", " + y + ")", 10, 5+HEIGHT/2);
        
    }
    
    /** Complement the "has pink disk" property */
    public void complementDisk()
    	{  hasDisk= !hasDisk; repaint();  }
    
    /** Remove pink disk (if present) */
    public void clearDisk() 
    	{  hasDisk= false; repaint();  }
    
    /** Contains methods that process mouse events */
    public class MouseEvents extends MouseInputAdapter {
        // Complement the "has pink disk" property
        public void mouseClicked(MouseEvent e)
            {  complementDisk();  }
    }
}