Bevisuali.UX.General.PieSlice.RefreshUIAngles C# (CSharp) Method

        private void RefreshUIAngles()
        {
            if (double.IsNaN(_startDegree)
                || double.IsNaN(_endDegree))
            {
                return;
            }

            Debug.Assert(_startDegree >= 0 && _startDegree <= 360.0);
            Debug.Assert(_endDegree >= 0 && _endDegree <= 360.0);
            Debug.Assert(_startDegree <= _endDegree);

            xRotation.Angle = _startDegree;

            double arcAngle = _endDegree - _startDegree;

            double arcAngleRadians = arcAngle * Math.PI / 180.0;

            double arcAngleRemapped = (arcAngleRadians - Math.PI * 0.5) * -1.0;
            double endX = Math.Cos(arcAngleRemapped) * 50 + 50;
            double endY = Math.Sin(arcAngleRemapped) * -50 + 50;

            xArc.Point = new Point(endX, endY);

            if (arcAngle >= 180.0)
            {
                xArc.IsLargeArc = true;
            }
            else
            {
                xArc.IsLargeArc = false;
            }

            // Update child content placement.
            {
                double angleMidpoint = (_startDegree + _endDegree) * 0.5;
                xChildRotation.Angle = angleMidpoint;
            }
        }