function calculatePinchDirection() {
      if (pinchZoom < 1) {
        return OUT;
      } else {
        return IN;
      }
    }
Returns the pinch direction, either IN or OUT for the given points
@return string Either {@link $.fn.swipe.directions.IN} or {@link $.fn.swipe.directions.OUT}
@see $.fn.swipe.directions
@inner