Java - Animacion para que desplaze una bola a un lugar del jpanel cuando doy click izquierdo

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.swing.JFrame;

import javax.swing.SwingUtilities;

/**

 *

 * @author andreas

 */

public class Bolas extends JFrame implements MouseListener {

    private int x1 = 0;

    private int y1 = 0;

    class AnimaBolasThread extends Thread {

        private double x2;

        private double y2;

        public AnimaBolasThread(double x2, double y2) {

            this.x2 = x2;

            this.y2 = y2;

        }

        public void run() {

            double deltaX = x2 - x1;

            double deltaY = y2 - y1;

            final double numSteps = 15;

            double incStepX = Math.abs(deltaX) / numSteps;

            incStepX *= deltaX > 0 ? 1 : -1;

            double m = deltaY / deltaX;

            double b = y1 - m * x1;

            for (int i = 1; i < numSteps + 1; i++) {

                x1 += incStepX;

                double y = m * x1 + b;

                y1 = (int) y;

                SwingUtilities.invokeLater(new Runnable() {

                    public void run() {

                        repaint();

                    }

                });

                try {

                    Thread.sleep(150);

                } catch (InterruptedException ex) {

                    Logger.getLogger(Bolas.class.getName()).log(Level.SEVERE, null, ex);

                }

            }

        }

    }

    public Bolas() {

        setSize(800, 800);

        setLocation(100, 100);

        addMouseListener(this);

        setVisible(true);

    }

    public void paint(Graphics g) {

        super.paintComponents(g);

        g.setColor(Color.RED);

        g.fillOval(x1, y1, 100, 100);

    }

    public static void main(String argv[]) {

        Bolas c = new Bolas();

    }

    @Override

    public void mouseClicked(MouseEvent e) {

        (new AnimaBolasThread(e.getX(), e.getY())).start();

    }

    @Override

    public void mousePressed(MouseEvent e) {

    }

    @Override

    public void mouseReleased(MouseEvent e) {

    }

    @Override

    public void mouseEntered(MouseEvent e) {

    }

    @Override

    public void mouseExited(MouseEvent e) {

    }

}