Half ellipse button?

Question

Hi,
i have to make a Button which has the form of a half ellipse. I saw how i can overwrite JButton to make a round button or ellipse button, but those are all predefined forms in graphics and graphics2d. And this doesnt help me to make button with half ellipse from (half circle is also a possibility but i guess it is something similar).
Do you have any suggestions?
Regards

Answer 1

Hi,
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class RoundButtonTest {
  public JComponent makeUI() {
    JPanel p = new JPanel();
    p.add(new RoundButton("aaa"));
    p.add(new RoundButton("bbbbbbbbbb"));
    return p;
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        createAndShowGUI();
  public static void createAndShowGUI() {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    f.getContentPane().add(new RoundButtonTest().makeUI());
    f.setSize(200, 100);
    f.setLocationRelativeTo(null);
    f.setVisible(true);
class RoundButton extends JButton {
  public RoundButton(String title) {
    super(title);
    setContentAreaFilled(false);
    setFocusPainted(false);
    setBackground(Color.ORANGE);
  private Shape shape;
  private Shape getButtonShape() {
    if (shape == null || !shape.getBounds().equals(getBounds())) {
      int w = getWidth()-1;
      shape = new Arc2D.Double(
          -w, 0, w*2, getHeight()-1, -90, 180, Arc2D.Double.CHORD);
    return shape;
  @Override protected void fireStateChanged() {
    ButtonModel model = getModel();
    if(!model.isEnabled()) {
      setBackground(Color.GRAY);
    } else if(model.isPressed() && model.isArmed()) {
      setBackground(Color.RED);
    } else if(model.isSelected()) {
      setBackground(Color.GREEN);
    } else if(isRolloverEnabled() && model.isRollover()) {
      setBackground(Color.PINK);
    } else {
      setBackground(Color.ORANGE);
    super.fireStateChanged();
  @Override protected void paintComponent(Graphics g) {
    Graphics2D g2 = (Graphics2D)g;
    g2.setColor(getBackground());
    g2.fill(getButtonShape());
    super.paintComponent(g);
  @Override protected void paintBorder(Graphics g) {
    Graphics2D g2 = (Graphics2D)g;
    g2.setColor(Color.CYAN);
    g2.draw(getButtonShape());
  @Override public boolean contains(int x, int y) {
    return getButtonShape().contains(x, y);
}