code: function(p1, p2) {
  		_tempPoint.x = Math.abs( p1.x - p2.x );
  		_tempPoint.y = Math.abs( p1.y - p2.y );
  		return Math.sqrt(_tempPoint.x * _tempPoint.x + _tempPoint.y * _tempPoint.y);
  	}
docs: amount of pixels to drag to determine direction of swipe