// MMath.SinToCos(double, EQuadrantList)
/// <summary>
/// Liefert den Kosinuswert zum Sinuswert und Quadranten.
/// </summary>
/// <param name="value">Sinuswert.</param>
/// <param name="quadrant">Quadrant.</param>
/// <returns>Kosinuswert zum Sinuswert und Quadranten.</returns>
public static double SinToCos(double value, EQuadrant quadrant)
{
double rtn = MMath.Sgn(value) * MMath.Sqr(1.0 - value * value);
if (quadrant == EQuadrant.II || quadrant == EQuadrant.IV)
{
rtn = -rtn;
}
return(rtn);
}
// MMath.ToQuadrant(double)
/// <summary>
/// Liefert den Quadranten zum Winkel.
/// </summary>
/// <param name="value">Winkel in Bogenmaß.</param>
/// <returns>Quadrant zum Winkel.</returns>
public static EQuadrant ToQuadrant(double value)
{
// Quadrant bestimmen und liefern
double rtn = MMath.Mod(value, MMath.Pi2);
if (MMath.Sgn(rtn) == -1.0)
{
rtn += MMath.Pi2;
}
return((EQuadrant)(int)MMath.Ceil(rtn / MMath.Rad090));
}
// MMath.ArcTan(double, double)
/// <summary>
/// Liefert den Winkel zum Tagensquotient in Bogenmaß.
/// </summary>
/// <param name="x">Zähler des Quotienten.</param>
/// <param name="y">Nenner des Quotienten.</param>
/// <returns>Winkel zum Tagensquotient in Bogenmaß.</returns>
public static double ArcTan(double x, double y)
{
// TODO: MMath.ArcTan(double, double): Prüfen, ob Eigenimplemention erforderlich ist {Meeus Seite 9}.
if (y == 0)
{
return(MMath.Sgn(x) * MMath.Rad090);
}
double l = MMath.ArcTan(x / y);
if (MMath.Sgn(y) == -1.0)
{
l += MMath.Pi;
}
return(l);
}
