import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * Zeichnet einen Kreis mit dem Mittelpunkt mx/my und dem Radius r
 * 
 */
public class KreisZeichnen extends JFrame {
	
	JPanel panel;
	
	public KreisZeichnen(){
		panel = new KreisPanel();
		add(panel);

		this.setSize(300, 300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}

	public static void main(String[] args) {
		new KreisZeichnen();
	}
}

class KreisPanel extends JPanel {
	public void paintComponent(Graphics g) {
		Graphics2D g2d = (Graphics2D) g;
		g2d.setColor(Color.WHITE);
		g2d.fillRect(0, 0, this.getWidth(), this.getHeight());
		g2d.setColor(Color.BLACK);
		int mx = 150;
		int my = 150;
		int r = 100;
		Ellipse2D.Double kreis = new Ellipse2D.Double(mx-r, my-r, 2*r, 2*r);
		
		g2d.draw(kreis);
	}
}