GetGeographicalDegrees

GetGeographicalDegrees.cs

        private static double GetGeographicalDegrees(IPolyline shape)
        {
            var radian2 = Math.Atan2(shape.ToPoint.Y - shape.FromPoint.Y,
                                    shape.ToPoint.X - shape.FromPoint.X);
            var radian = radian2 - (Math.PI / 2);//# turn minus 90°
            var degrees = 0.0;
            if (radian > 0)
            {
                degrees = 360 - (radian * 360) / (2 * Math.PI);
            }
            else
            {
                degrees = 360 - ((2 * Math.PI + radian) * 360) / (2 * Math.PI);
            }

            Debug.WriteLine($"radian2: {radian2} radian {radian} degrees {degrees} Cos(rad) {Math.Cos(radian)} Sin(rad) {Math.Sin(radian)}");
            Debug.WriteLine($"radian2: {radian2} radian {radian} degrees {degrees} Cos(degree) {Math.Cos(degrees)} Sin(rad) {Math.Sin(degrees)}");

            return degrees;
        }