/**
 * This is example #2 out of 6, showing a sequence of improvements through
 * the progression of examples.  The six files should be viewed in order.
 * 
 * This file shows a somewhat better approach to handling drawing.  The
 * drawing has been moved from the 'mouseClicked()' event to the 'paint()'
 * method.  However, the 'paint()' method is called directly (a bad policy),
 * and the background is continuously set to yellow using the graphics
 * context (by setting a rectangle to be filled with yellow in the 'paint()'
 * method), which is poor coding, and also unnecessary, since the background
 * never changes.  This is still not a drawing program, since one cannot yet
 * draw.
*/

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

public class GraphicsDrawing2 extends Applet
{
	// To avoid a "ghost" red dot when the applet first loads, set the
	//  initial mouse coordinates outside the applet's layout (visible) area
	private int mouseX = -10;
	private int mouseY = -10;

	public void init()
	{
		setSize(400, 400);
		addMouseListener(new HandleMouse());
	}

	class HandleMouse extends MouseAdapter
	{
		public void mouseClicked(MouseEvent e)
		{
			Graphics g = getGraphics();
			mouseX = e.getX();
			mouseY = e.getY();
			paint(g); // A direct call to 'paint()' is poor program design
		}
	}

	public void paint(Graphics g)
	{
		g.setColor(Color.yellow);
		g.fillRect(0, 0, getSize().width, getSize().height);
		g.setColor(Color.red);
		g.fillOval(mouseX - 10, mouseY - 10, 20, 20);
	}
}