Direction d'une balle

package effr;

import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.MouseInputListener;

public class Effr {
    private final JFrame frame;
    private final Balle balle;
    private int depX, depY;
    private final int height = 500;
    private final int width = 500;
    public Effr(){
        frame = new JFrame();
        frame.setSize(width,height);
        depX = 0;depY = 0;
        frame.addMouseListener(new MouseInputListener() {

            @Override
            public void mouseClicked(MouseEvent e) {
                int x = e.getX();
                int y = e.getY();
                depX = -Math.floorDiv(width,y);
                depY = Math.floorDiv(height,x);
                depX=depX==0?-1:depX;
                depY=depY==0?1:depY;
                if(balle.posX < x){
                    depX=-depX;
                }
                if(balle.posY > y){
                    depY=-depY;
                }
                System.out.println("click!");
            }

            @Override
            public void mousePressed(MouseEvent e) {
            }

            @Override
            public void mouseReleased(MouseEvent e) {
            }

            @Override
            public void mouseEntered(MouseEvent e) {
            }

            @Override
            public void mouseExited(MouseEvent e) {
            }

            @Override
            public void mouseDragged(MouseEvent e) {
            }

            @Override
            public void mouseMoved(MouseEvent e) {
            }
        });
        balle = new Balle(10,10);
        frame.add(balle);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        lancerJeu();
    }
    public void lancerJeu(){
        Thread t = new Thread(new Runnable() {

            @Override
            public void run() {
                while(true){
                    balle.setBallLocation(balle.posX+depX, balle.posY+depY);
                    try{
                        Thread.sleep(100);
                    }catch(InterruptedException e){
                        break;
                    }
                }
            }
        });
        t.start();
    }
    private class Balle extends JPanel{
        public int posX, posY;
        public Balle(int x, int y){
            posX=x;
            posY=y;
        }
        @Override
        public void paint(Graphics g){
            g.clearRect(0, 0, width, height);
            g.fillOval(posX, posY, 30, 30);
        }
        public void setBallLocation(int x, int y){
            posX = x;
            posY = y;
            repaint();
        }
    }
    public static void main(String[] args) {
        Effr e = new Effr();
    }
    
}