code: function(v) {
          //var theta = -1 * (v % 360); //angle always between 0 and 359
          var difference = this._rotation - v;
          // skip if there's no rotation!
          if (difference === 0) return;
          else this._rotation = v;
  
          this._calculateMBR();
  
          this.trigger("Rotate", difference);
      }
docs: Handle changes that need to happen on a rotation