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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Scattering/Rotations.cpp
//! @brief Implements class IRotationes.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "Sample/Scattering/Rotations.h"
#include "Base/Util/Assert.h"
// ************************************************************************************************
// interface IRotation
// ************************************************************************************************
IRotation::IRotation(const std::vector<double>& PValues)
: INode(PValues)
{
}
IRotation* IRotation::createRotation(const RotMatrix& matrix)
{
if (matrix.isIdentity())
return new IdentityRotation;
if (std::optional<double> angle = matrix.angleAroundCoordAxis(0))
return new RotationX(angle.value());
if (std::optional<double> angle = matrix.angleAroundCoordAxis(1))
return new RotationY(angle.value());
if (std::optional<double> angle = matrix.angleAroundCoordAxis(2))
return new RotationZ(angle.value());
auto angles = matrix.zxzEulerAngles();
return new RotationEuler(angles[0], angles[1], angles[2]);
}
R3 IRotation::transformed(const R3& v) const
{
return rotMatrix().transformed(v);
}
bool IRotation::isIdentity() const
{
return rotMatrix().isIdentity();
}
bool IRotation::zInvariant() const
{
return rotMatrix().isZRotation();
}
//! Returns concatenated rotation (first right, then left).
IRotation* createProduct(const IRotation& left, const IRotation& right)
{
RotMatrix tr_left = left.rotMatrix();
RotMatrix tr_right = right.rotMatrix();
IRotation* result = IRotation::createRotation(tr_left * tr_right);
return result;
}
// ************************************************************************************************
// class IdentityRotation
// ************************************************************************************************
IdentityRotation::IdentityRotation()
: IRotation({})
{
}
RotMatrix IdentityRotation::rotMatrix() const
{
return {};
}
// ************************************************************************************************
// class RotationX
// ************************************************************************************************
//! Constructor of rotation around x-axis
RotationX::RotationX(const std::vector<double> P)
: IRotation(P)
, m_angle(m_P[0])
{
}
RotationX::RotationX(double angle)
: RotationX(std::vector<double>{angle})
{
}
RotMatrix RotationX::rotMatrix() const
{
return RotMatrix::AroundX(m_angle);
}
// ************************************************************************************************
// class RotationY
// ************************************************************************************************
//! Constructor of rotation around y-axis
RotationY::RotationY(const std::vector<double> P)
: IRotation(P)
, m_angle(m_P[0])
{
}
RotationY::RotationY(double angle)
: RotationY(std::vector<double>{angle})
{
}
RotMatrix RotationY::rotMatrix() const
{
return RotMatrix::AroundY(m_angle);
}
// ************************************************************************************************
// class RotationZ
// ************************************************************************************************
// --- RotationZ --------------------------------------------------------------
//! Constructor of rotation around z-axis
RotationZ::RotationZ(const std::vector<double> P)
: IRotation(P)
, m_angle(m_P[0])
{
}
RotationZ::RotationZ(double angle)
: RotationZ(std::vector<double>{angle})
{
}
RotMatrix RotationZ::rotMatrix() const
{
return RotMatrix::AroundZ(m_angle);
}
// ************************************************************************************************
// class RotationEuler
// ************************************************************************************************
RotationEuler::RotationEuler(const std::vector<double> P)
: IRotation(P)
, m_alpha(m_P[0])
, m_beta(m_P[1])
, m_gamma(m_P[2])
{
}
RotationEuler::RotationEuler(double alpha, double beta, double gamma)
: RotationEuler(std::vector<double>{alpha, beta, gamma})
{
}
IRotation* RotationEuler::createInverse() const
{
RotMatrix inverse_transform(rotMatrix().Inverse());
return createRotation(inverse_transform);
}
RotMatrix RotationEuler::rotMatrix() const
{
return RotMatrix::EulerZXZ(m_alpha, m_beta, m_gamma);
}
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