Java zoom koleckem mysi

// zoomovani mysi
        out.getCanvas().addMouseWheelListener(new MouseWheelListener() {
            public void mouseWheelMoved(MouseWheelEvent e) {
                int count = e.getWheelRotation(); // smer toceni koleckem mysi
                System.out.println(count);
                if (count > 0) { // -1 = nahoru
                    eye = eye.add(view.mul(1)); // 1 = plynulost zoomu
                } else { // +1 = dolu
                    eye = eye.add(view.mul(-1)); // -1 = plynulost zoomu
                }
                draw();
            }
        });