code: public void cancelMove ()
      {
          if (_path != null) {
              Path oldpath = _path;
              _path = null;
              oldpath.wasRemoved(this);
              if (_observers != null) {
                  _observers.apply(new CancelledOp(this, oldpath));
              }
          }
      }
docs: Cancels any path that the sprite may currently be moving along.