     /// flag that indicates if rotation is done with two fingers or one.
     /// when the chart is inside a scrollview, you need a two-finger rotation because a one-finger rotation eats up all touch events.
     ///
+    /// On iOS this will disable one-finger rotation.
+    /// On OSX this will keep two-finger multitouch rotation, and one-pointer mouse rotation.
+    ///
     /// **default**: false
     public var isRotationWithTwoFingers: Bool
     {

                
                let touchLocation = touch.locationInView(self)
                
                self.resetVelocity()
                
                if (rotationEnabled)
                {
                    self.sampleVelocity(touchLocation: touchLocation)
                }
                
                self.setGestureStartAngle(x: touchLocation.x, y: touchLocation.y)
                
                _touchStartPoint = touchLocation
            }
        }
        

            
            let touchLocation = touch.locationInView(self)
            
            processRotationGestureMoved(location: touchLocation)
        }
        
        if (!_isRotating)
