/// <summary>
/// Units the normal vector at.
/// </summary>
/// <param name="angleRadians">The angle radians.</param>
/// <returns>VectorParametric.</returns>
public VectorParametric UnitNormalVectorAt(double angleRadians)
{
VectorParametric unitTangentVector = UnitTangentVectorAt(angleRadians);
VectorParametric unitTangentVectorPrime = unitTangentVector.Differentiate();
return(unitTangentVectorPrime / unitTangentVectorPrime.Magnitude(angleRadians));
}
/// <summary>
/// Curvatures the specified angle radians.
/// </summary>
/// <param name="angleRadians">The angle radians.</param>
/// <returns>System.Double.</returns>
public double Curvature(double angleRadians)
{
VectorParametric unitTangentVector = UnitTangentVectorAt(angleRadians);
VectorParametric unitTangentVectorPrime = unitTangentVector.Differentiate();
VectorParametric vectorPrime = Differentiate();
return(unitTangentVectorPrime.Magnitude(angleRadians) / vectorPrime.Magnitude(angleRadians));
}