问WP7相机看到的角度是什么？

EN

namespace PhoneUtilities.Utilities
{
    public class AccelerometerMath
    {
        public static double RadianToDegree(double radians)
        {

            return radians * (180 / Math.PI);
        }

        public static double Pitch(AccelerometerReading e)
        {
            return RadianToDegree((Math.Atan(e.Acceleration.X / Math.Sqrt(Math.Pow(e.Acceleration.Y, 2) + Math.Pow(e.Acceleration.Z, 2)))));
        }

        public static double Roll(AccelerometerReading e)
        {
            return RadianToDegree((Math.Atan(e.Acceleration.Y / Math.Sqrt(Math.Pow(e.Acceleration.X, 2) + Math.Pow(e.Acceleration.Z, 2)))));
        }

        public static double Yaw(AccelerometerReading e)
        {
            return RadianToDegree((Math.Atan(Math.Sqrt(Math.Pow(e.Acceleration.X, 2) + Math.Pow(e.Acceleration.Y, 2)) / e.Acceleration.Z)));
        }
    }
}

private double CalcUpAdj(AccelerometerReading reading)
{
    double angle = PhoneUtilities.Utilities.AccelerometerMath.Yaw(reading);

    //Get the angleNeeded for calculation
    double angleNeeded = Math.Abs(angle);
    double adj = CalcAdj(angleNeeded);

    tbAngle.Text = String.Format("{0:0.00}", angleNeeded) + (char)176;
    textBlockAdj.Text = adj.ToString();

    return adj;
}

private double CalcAdj(double angleNeeded)
{
    double number;
    if (double.TryParse(tbHyp.Text, out number))
    {
        double hyp = number;
        double adj = Math.Cos(Math.PI * angleNeeded / 180) * hyp;

        tbAngle.Text = String.Format("{0:0.00}", angleNeeded) + (char)176;

        textBlockAdj.Text = adj.ToString();
        return adj;
    }

    return 0;
}