vectorTensorTransformI.H

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    Copyright (C) 2025 OpenCFD Ltd.
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    This file is part of OpenFOAM.
 
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// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
inline Foam::vectorTensorTransform::vectorTensorTransform()
:
    t_(Zero),
    R_(sphericalTensor::I),
    hasR_(false)
{}
 
 
inline Foam::vectorTensorTransform::vectorTensorTransform
(
    const vector& t,
    const tensor& R,
    bool hasR
)
:
    t_(t),
    R_(R),
    hasR_(hasR)
{}
 
 
inline Foam::vectorTensorTransform::vectorTensorTransform(const vector& t)
:
    t_(t),
    R_(sphericalTensor::I),
    hasR_(false)
{}
 
 
inline Foam::vectorTensorTransform::vectorTensorTransform(const tensor& R)
:
    t_(Zero),
    R_(R),
    hasR_(true)
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
inline Foam::tensor& Foam::vectorTensorTransform::R() noexcept
{
    // Assume that non-const access to R changes it from I, so set
    // hasR to true
    hasR_ = true;
 
    return R_;
}
 
 
inline Foam::vector Foam::vectorTensorTransform::transformPosition
(
    const vector& v
) const
{
    if (hasR_)
    {
        return t() + (R() & v);
    }
    else
    {
        return t() + v;
    }
}
 
 
inline Foam::pointField Foam::vectorTensorTransform::transformPosition
(
    const pointField& pts
) const
{
    tmp<pointField> tfld;
 
    if (hasR_)
    {
        tfld = t() + (R() & pts);
    }
    else
    {
        tfld = t() + pts;
    }
    return tfld();
}
 
 
inline void Foam::vectorTensorTransform::transformPositionList
(
    UList<point>& pts
) const
{
    if (hasR_)
    {
        for (auto& p : pts)
        {
            p = t() + (R() & p);
        }
    }
    else
    {
        for (auto& p : pts)
        {
            p += t();
        }
    }
}
 
 
inline Foam::vector Foam::vectorTensorTransform::invTransformPosition
(
    const vector& v
) const
{
    if (hasR_)
    {
        return (R().T() & (v - t()));
    }
    else
    {
        return v - t();
    }
}
 
 
inline Foam::pointField Foam::vectorTensorTransform::invTransformPosition
(
    const pointField& pts
) const
{
    tmp<pointField> tfld;
 
    if (hasR_)
    {
        tfld = (R().T() & (pts - t()));
    }
    else
    {
        tfld = pts - t();
    }
    return tfld();
}
 
 
inline void Foam::vectorTensorTransform::invTransformPositionList
(
    UList<point>& pts
) const
{
    if (hasR_)
    {
        const auto rot = R().T();
 
        for (auto& p : pts)
        {
            p = (rot & (p - t()));
        }
    }
    else
    {
        for (auto& p : pts)
        {
            p -= t();
        }
    }
}
 
 
// * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
 
inline void Foam::vectorTensorTransform::operator&=
(
    const vectorTensorTransform& tr
)
{
    t_ += tr.t_;
    R_ = tr.R_ & R_;
 
    // If either of the two objects has hasR_ as true, then inherit
    // it, otherwise, these should both be I tensors.
    hasR_ = tr.hasR_ || hasR_;
}
 
 
inline void Foam::vectorTensorTransform::operator=(const vector& t)
{
    t_ = t;
}
 
 
inline void Foam::vectorTensorTransform::operator+=(const vector& t)
{
    t_ += t;
}
 
 
inline void Foam::vectorTensorTransform::operator-=(const vector& t)
{
    t_ -= t;
}
 
 
inline void Foam::vectorTensorTransform::operator=(const tensor& R)
{
    hasR_ = true;
 
    R_ = R;
}
 
 
inline void Foam::vectorTensorTransform::operator&=(const tensor& R)
{
    hasR_ = true;
 
    R_ = R & R_;
}
 
 
// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
inline Foam::vectorTensorTransform Foam::inv(const vectorTensorTransform& tr)
{
    return vectorTensorTransform(-tr.t(), tr.R().T(), tr.hasR());
}
 
 
// * * * * * * * * * * * * * * * Global Operators  * * * * * * * * * * * * * //
 
inline bool Foam::operator==
(
    const vectorTensorTransform& tr1,
    const vectorTensorTransform& tr2
)
{
    return (tr1.t() == tr2.t() && tr1.R() == tr2.R());
}
 
 
inline bool Foam::operator!=
(
    const vectorTensorTransform& tr1,
    const vectorTensorTransform& tr2
)
{
    return !operator==(tr1, tr2);
}
 
 
inline Foam::vectorTensorTransform Foam::operator+
(
    const vectorTensorTransform& tr,
    const vector& t
)
{
    return vectorTensorTransform(tr.t() + t, tr.R(), tr.hasR());
}
 
 
inline Foam::vectorTensorTransform Foam::operator+
(
    const vector& t,
    const vectorTensorTransform& tr
)
{
    return vectorTensorTransform(t + tr.t(), tr.R(), tr.hasR());
}
 
 
inline Foam::vectorTensorTransform Foam::operator-
(
    const vectorTensorTransform& tr,
    const vector& t
)
{
    return vectorTensorTransform(tr.t() - t, tr.R(), tr.hasR());
}
 
 
inline Foam::vectorTensorTransform Foam::operator&
(
    const vectorTensorTransform& tr1,
    const vectorTensorTransform& tr2
)
{
    return vectorTensorTransform
    (
        tr1.t() + tr2.t(),
        tr1.R() & tr2.R(),
        (tr1.hasR() || tr2.hasR())
    );
}
 
 
// ************************************************************************* //