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http://henterji.blogbus.com/logs/2034344.html

import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Ellipse2D;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class EclipseButton extends JComponent implements MouseListener,
MouseMotionListener {

static public Color ACTIVE_COLOR = Color.red;

static public Color INACTIVE_COLOR = Color.darkGray;

protected String text;

protected Ellipse2D ellipse2D;

protected Rectangle rectangle;

protected boolean isActive;

protected static EclipseButton button;

public EclipseButton(Ellipse2D ellipse2D, String text) {
this.ellipse2D = ellipse2D;
setText(text);

setOpaque(false);

addMouseListener(this);
addMouseMotionListener(this);

rectangle = new Rectangle(ellipse2D.getBounds());
rectangle.grow(1, 1);

setBounds(rectangle);
}

public void setText(String t) {
text = t;
}

public String getText() {
return text;
}

public void mouseMoved(MouseEvent e) {
if (!rectangle.contains(e.getX(), e.getY()) || e.isConsumed()) {
if (isActive) {
isActive = false;
repaint();
}
return;
}

int x = e.getX() - rectangle.x;
int y = e.getY() - rectangle.y;
boolean active = ellipse2D.contains(x, y);

if (isActive != active)
setState(active);
if (active)
e.consume();
}

public void mouseDragged(MouseEvent e) {
}

protected void setState(boolean active) {
isActive = active;
repaint();
if (active) {
if (button != null)
button.setState(false);
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
} else {
button = null;
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
}

public void mouseClicked(MouseEvent e) {
System.out.println("mouseClicked");
}

public void mousePressed(MouseEvent e) {
System.out.println("mousePressed");
}

public void mouseReleased(MouseEvent e) {
System.out.println("mouseReleased");
}

public void mouseExited(MouseEvent e) {
System.out.println("mouseExited");
mouseMoved(e);
}

public void mouseEntered(MouseEvent e) {
System.out.println("mouseEntered");
mouseMoved(e);
}

public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Ellipse2D e2 = new Ellipse2D.Float(0, 0, 100, 50);
g2.setColor(isActive ? ACTIVE_COLOR : INACTIVE_COLOR);
g2.draw(e2);
}

public static void main(String[] argv) {
JFrame f = new JFrame();
f.setSize(400, 300);
Ellipse2D p = new Ellipse2D.Float(0, 0, 100, 50);

EclipseButton btn = new EclipseButton(p, "button");
f.getContentPane().add(btn);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}