// File PaintingCanvas.java

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

class PaintingCanvas extends JPanel
{
    private int xValue = -10, yValue = -10;
    
    public PaintingCanvas()
    {
	   addMouseMotionListener (
	         new MouseMotionAdapter()
		     {
		        public void mouseDragged (MouseEvent e)
		        {
			      xValue = e.getX();
			      yValue = e.getY();
			      repaint();
		        }
		     }         
                             );
    }
    
    public void paintComponent (Graphics g)
    {
	     g.fillOval(xValue, yValue, 7, 7);
    }
}