docs: function(x, y) {
          if (this.mapArea) {
              return this.mapArea.containsPoint(x, y);
          } else if (this.map) {
              return this.map.containsPoint(x, y);
          }
          var mbr = this._mbr || this;
          return (
              mbr._x <= x &&
              mbr._x + mbr._w >= x &&
              mbr._y <= y &&
              mbr._y + mbr._h >= y
          );
      }