private void addRelativeMove(float x, float y) {
		Coordinate lastCoordinates;
		try {
			lastCoordinates = coordinates.getLast();
		} catch (NoSuchElementException e) {
			lastCoordinates = new Coordinate(0, 0);
		}
		coordinates.add(new Coordinate(lastCoordinates.x+x, lastCoordinates.y+y));
	}