@Override
    public void onScroll(ScrollEvent event) {
        BoundingBox bbox = mapView.getBoundingBox();
        if (bbox != null) {
            osmOverlay.updateBoundingBox(bbox);
        }
    }

    @Override
    public void onZoom(ZoomEvent event) {
        BoundingBox bbox = mapView.getBoundingBox();
        if (bbox != null) {
            osmOverlay.updateBoundingBox(bbox);
        }
    }

    @Override
    public void onRotate(RotateEvent event) {
        BoundingBox bbox = mapView.getBoundingBox();
        if (bbox != null) {
            osmOverlay.updateBoundingBox(bbox);
        }
    }