Java Applet ile yapılmış tıklanan yere göre teğet çizen algoritma

package kodsozluk;

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class yuvarlakteğet extends Applet implements MouseListener {

    int x, y,farex,farey;
boolean tiklama = false;
    public void init() {
        x=getWidth()/2;
        y=getHeight()/2;
        addMouseListener(this);
    }
    public void paint(Graphics g) {
        g.drawOval(getWidth()/2-50, getHeight()/2-50, 100, 100);
        if(tiklama)
        g.drawLine(x, y, farex, farey);
    }
    public void mouseClicked(MouseEvent e) {
        tiklama = true;
        farex=e.getX();
        farey=e.getY();
        double tan=Math.atan2(farey-y,farex- x)+80;
        double cos=getWidth()/2+Math.cos(tan)*50;
        double sin=getHeight()/2+Math.sin(tan)*50;
        
        x=(int)cos;
        y=(int)sin;
        repaint();
        
    }
    public void mousePressed(MouseEvent e) {
    }
    public void mouseReleased(MouseEvent e) {
    }
    public void mouseEntered(MouseEvent e) {
    }
    public void mouseExited(MouseEvent e) {
    }
}

Ekran Görüntüsü;