code: function calculateDistance(startPoint, endPoint) {
  			return Math.round(Math.sqrt(Math.pow(endPoint.x - startPoint.x, 2) + Math.pow(endPoint.y - startPoint.y, 2)));
  		}
docs: Calculate the length / distance of the 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 int
  @inner