// <applet code="SimpleSpot2" width="200" height="100"></applet>

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.*;

public class SimpleSpot2 extends Applet implements MouseListener {
	private Spot spot = null;

	private static final int RADIUS = 15;

	private Color spotColor = new Color(230, 182, 95);

	public void init() {
		addMouseListener(this);
	}

	public void paint(Graphics g) {
		if (spot != null)
			spot.draw(g);
	}

	public void mousePressed(MouseEvent e) {
		if (e.getButton() != MouseEvent.BUTTON1)
			return;
		if (spot == null)
			spot = new Spot(0, 0, RADIUS);
		// outer has access to inner class
		spot.x = e.getX();
		spot.y = e.getY();
		// NEVER call paint()
		repaint();
	}

	public void mouseClicked(MouseEvent e) {
	}

	public void mouseReleased(MouseEvent e) {
	}

	public void mouseEntered(MouseEvent e) {
	}

	public void mouseExited(MouseEvent e) {
	}

	private class Spot {
		private int radius;

		private int x, y;

		Spot(int x, int y, int r) {
			this.radius = r;
			this.x = x;
			this.y = y;
		}

		void draw(Graphics g) {
			// duplicate Graphics and turn it into a Graphics2D
			Graphics2D g2d = (Graphics2D) g.create();
			// turn on antialiasing for smooth painting
			g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
			// inner class has access to outer class
			g2d.setColor(spotColor);
			g2d.fillOval(x - radius, y - radius, radius * 2, radius * 2);
		}
	}
}