/**
 * This is example #3 out of 6, showing a sequence of improvements through
 * the progression of examples.  The six files should be viewed in order.
 * 
 * This file shows an even better approach to handling drawing.  The
 * background color (yellow) is now set in the 'init()' method, and it is
 * done properly (using the 'setBackground()' method).  After that, the
 * built-in (default) 'update()' method is being used to automatically handle
 * the background, while 'paint()' just updates the red dot.  The 'update()'
 * method first refreshes (clears) the applet window background, and then    
 * calls 'paint()'.  The 'update()' method is called directly, which is not
 * the best programming practice.  Once again, this is still not a drawing
 * program.
 */

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

public class GraphicsDrawing3 extends Applet
{
	int mouseX = -10;
	int mouseY = -10;

	public void init()
	{
		setSize(400, 400);
		setBackground(Color.yellow);
		addMouseListener(new HandleMouse());
	}

	class HandleMouse extends MouseAdapter
	{
		public void mouseClicked(MouseEvent e)
		{
			Graphics g = getGraphics();
			mouseX = e.getX();
			mouseY = e.getY();
			update(g); // A direct call to 'update()' is not a good idea
		}
	}

	public void paint(Graphics g)
	{
		g.setColor(Color.red);
		g.fillOval(mouseX - 10, mouseY - 10, 20, 20);
	}
}