ArcMapAddinDistanceAndDirection.ViewModels.EllipseViewModel.UpdateFeedback C# (CSharp) Метод

        private IPoint UpdateFeedback(IPoint centerPoint, double axisTypeDistance)
        {
            if (centerPoint != null && axisTypeDistance > 0.0)
            {
                if (feedback == null)
                {
                    var mxdoc = ArcMap.Application.Document as IMxDocument;
                    CreateFeedback(centerPoint, mxdoc.FocusMap as IActiveView);
                    feedback.Start(centerPoint);
                }

                // now get second point from distance and bearing
                var construct = new Polyline() as IConstructGeodetic;
                if (construct == null)
                {
                    return null;
                }                    

                construct.ConstructGeodeticLineFromDistance(GetEsriGeodeticType(), centerPoint, GetLinearUnit(), axisTypeDistance, 
                    GetAzimuthAsDegrees(), esriCurveDensifyMethod.esriCurveDensifyByDeviation, -1.0);

                var line = construct as IPolyline;

                if (line.ToPoint != null)
                {
                    //FeedbackMoveTo(line.ToPoint);
                    return line.ToPoint;
                }
            }
            return null;
        }