code: function ( type, mx, my, swipeTime ) {
              var swipeSize = 0, result = 'none';
      
              if ( type == 'horizontal' ) {
                  swipeSize = this._sensitivityCalibration( this._swipeWidth, swipeTime );
      
                  if ( swipeSize <= Math.abs(mx) ) {
                      if ( mx > 0 ) result = 'right';
                      if ( mx < 0 ) result = 'left';
                  }
              } else {
                  swipeSize = this._sensitivityCalibration( this._swipeHeight, swipeTime );
      
                  if ( swipeSize <= Math.abs(my) ) {
                      if ( my > 0 ) result = 'down';
                      if ( my < 0 ) result = 'up';
                  }
              }
              return result;
          }
docs: Swip 방향 반환 (left, right, up, down, none)