import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class SimpleStamperPanel extends JPanel implements MouseListener {
	
	public SimpleStamperPanel() {
		setBackground(Color.BLACK);
		addMouseListener(this);
	}

	public void mousePressed(MouseEvent evt) {
		if (evt.isShiftDown()) {
			repaint();
			return;
		}
		int x = evt.getX();
		int y = evt.getY();

		Graphics g = getGraphics();
		
		if (evt.isMetaDown()) {
			g.setColor(Color.BLUE);
			g.fillOval(x-30, y - 15, 60, 30);
			g.setColor(Color.BLACK);
			g.drawOval(x-30, y-15,60,30);
		}
		else {
			g.setColor(Color.RED);
			g.fillRect(x-30, y -15, 60,30);
			g.setColor(Color.BLACK);
			g.drawRect(x-30, y-15,60,30);
		}
		g.dispose();
	}

	public void mouseEntered(MouseEvent evt) { }
	public void mouseExited(MouseEvent evt) { }
	public void mouseClicked(MouseEvent evt) { }
	public void mouseReleased(MouseEvent evt) { }

}

public class HolaMundoGui3 {

	public static void main(String[] args) {
		
		SimpleStamperPanel panel = new SimpleStamperPanel();
		JFrame window = new JFrame("Tercer Ejemplo");
		window.setContentPane(panel);
		window.setSize(250, 300);
		window.setLocation(200,200);
		window.setVisible(true);
	};
};