public final void addMarker(final Marker MARKER) {
        if (!markers.keySet().contains(MARKER)) {
            Rotate markerRotate = new Rotate(180 - getStartAngle());
            MARKER.getTransforms().setAll(markerRotate);
            MARKER.getStyleClass().add("marker" + markers.size());
            markers.put(MARKER, markerRotate);
        }
    }