import java.applet.Applet;
import java.awt.Rectangle;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

/** This program will show many squares in an applet.  Each time you click on
 *  one, it will turn blue (until you click on a different square).
 */
public class MouseApplet3 extends Applet
{
  private Rectangle [][] box;
  private int row;
  private int col;

  public void init()
  {
    // When drawing the boundaries of the squares, j refers to the inner
    // loop which is the column number, which corresponds to x.  And so
    // i corresponds to y.  (At first this may seem backwards!)
    box = new Rectangle[8][8];
    for (int i = 0; i < 8; ++i)
      for (int j = 0; j < 8; ++j)
        box[i][j] = new Rectangle(35*j,35*i,35,35);
    DetectInput listener = new DetectInput();
    addMouseListener(listener);
  }

  class DetectInput implements MouseListener
  {
    public void mousePressed(MouseEvent event)
    {
      int x = event.getX();
      int y = event.getY();

      // set row and col based on x and y
      row = y / 35;
      col = x / 35;

      repaint();
    }
    public void mouseReleased(MouseEvent event) {}
    public void mouseClicked(MouseEvent event) {}
    public void mouseEntered(MouseEvent event) {}
    public void mouseExited(MouseEvent event) {}
  }

  public void paint(Graphics g)
  {
    Graphics2D g2 = (Graphics2D) g;
    g2.setColor(Color.blue);
    g2.fill(box[row][col]);

    for (int i = 0; i < 8; ++i)
      for (int j = 0; j < 8; ++j)
        g2.draw(box[i][j]);
  }
}