code: function calculateDirection(startPoint, endPoint ) {
  			var angle = calculateAngle(startPoint, endPoint);
  
  			if ((angle <= 45) && (angle >= 0)) {
  				return LEFT;
  			} else if ((angle <= 360) && (angle >= 315)) {
  				return LEFT;
  			} else if ((angle >= 135) && (angle <= 225)) {
  				return RIGHT;
  			} else if ((angle > 45) && (angle < 135)) {
  				return DOWN;
  			} else {
  				return UP;
  			}
  		}
docs: Calculate the direction of the swipe
  This will also call calculateAngle to get the latest angle of swipe
  @param {point} startPoint A point object containing x and y co-ordinates
  @param {point} endPoint A point object containing x and y co-ordinates
  @return string Either {@link $.fn.swipe.directions.LEFT} / {@link $.fn.swipe.directions.RIGHT} / {@link $.fn.swipe.directions.DOWN} / {@link $.fn.swipe.directions.UP}
  @see $.fn.swipe.directions
  @inner