SineI.H

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#include "Sine.H"
#include "mathematicalConstants.H"

// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class Type>
inline Type Foam::Function1s::Sine<Type>::value(const scalar x) const
{
    const scalar phi = constant::mathematical::twoPi*frequency_*(x - start_);

    return amplitude_->value(x)*sin(phi) + level_->value(x);
}


template<class Type>
inline Type Foam::Function1s::Sine<Type>::integral
(
    const scalar x1,
    const scalar x2
) const
{
    using namespace constant::mathematical;

    if (!integrable_)
    {
        FatalErrorInFunction
            << "Integration is not defined for " << type() << " functions "
            << "unless the amplitude is constant"
            << exit(FatalError);
    }

    const scalar phi1 = constant::mathematical::twoPi*frequency_*(x1 - start_);
    const scalar phi2 = constant::mathematical::twoPi*frequency_*(x2 - start_);

    return
      - amplitude_->value(NaN)*(cos(phi2) - cos(phi1))/(twoPi*frequency_)
      + level_->integral(x1, x2);
}


// ************************************************************************* //