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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sim/Scan/BeamScan.cpp
//! @brief Implements interface BeamScan.
//!
//! @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 "Sim/Scan/BeamScan.h"
#include "Base/Axis/Frame.h"
#include "Base/Axis/Scale.h"
#include "Base/Math/Numeric.h"
#include "Base/Spin/SpinMatrix.h"
#include "Base/Util/Assert.h"
#include "Device/Beam/Beam.h"
#include "Device/Pol/PolFilter.h"
#include "Param/Distrib/Distributions.h"
#include "Param/Distrib/ParameterSample.h"
#include "Resample/Slice/KzComputation.h"
BeamScan::BeamScan(const Scale& axis)
: m_axis(axis.clone())
{
}
BeamScan::~BeamScan() = default;
void BeamScan::copyBeamScan(BeamScan* dest) const
{
dest->m_beams = m_beams; // TODO cleanup: here we are overwriting what was set in the c'tor
if (m_pol_analyzer)
dest->setAnalyzer(m_pol_analyzer->BlochVector(), m_pol_analyzer->transmission());
}
std::vector<const INode*> BeamScan::nodeChildren() const
{
std::vector<const INode*> result;
if (m_pol_analyzer)
result << m_pol_analyzer.get();
return result;
}
void BeamScan::setAnalyzer(const R3& Bloch_vector, double mean_transmission)
{
m_pol_analyzer = std::make_unique<PolFilter>(Bloch_vector, mean_transmission);
}
size_t BeamScan::nScan() const
{
return m_axis->size();
}
double BeamScan::commonIntensity() const
{
if (!isCommonIntensity())
throw std::runtime_error("Intensity changes during scan. "
"Use 'intensityAt(i)' instead.");
return m_beams.front()->intensity();
}
void BeamScan::setIntensity(double intensity)
{
for (auto& b : m_beams)
b->setIntensity(intensity);
}
double BeamScan::intensityAt(size_t i) const
{
return m_beams[i]->intensity();
}
const R3& BeamScan::commonPolarization() const
{
if (!isCommonPolarization())
throw std::runtime_error("Polarization changes during scan. "
"Use 'polarizationAt(i)' instead.");
return m_beams.front()->polVector();
}
R3 BeamScan::polarizationAt(size_t i) const
{
return m_beams[i]->polVector();
}
void BeamScan::setPolarization(const R3& bloch_vector)
{
for (auto& b : m_beams)
b->setPolarization(bloch_vector);
}
SpinMatrix BeamScan::polarizerMatrixAt(size_t i) const
{
return m_beams[i]->polMatrix();
}
SpinMatrix BeamScan::analyzerMatrix() const
{
return m_pol_analyzer ? m_pol_analyzer->matrix() : SpinMatrix::One();
}
std::vector<complex_t> BeamScan::produceKz(const SliceStack& slices, const R3& k) const
{
return Compute::Kz::computeKzFromRefIndices(slices, k);
}
bool BeamScan::isCommonIntensity() const
{
const auto ref = m_beams.front()->intensity();
for (const auto& b : m_beams)
if (!Numeric::almostEqual(b->intensity(), ref, 1))
return false;
return true;
}
bool BeamScan::isCommonPolarization() const
{
const auto ref = m_beams.front()->polVector();
for (const auto& b : m_beams)
if (!Numeric::almostEqual(b->polVector(), ref, 1))
return false;
return true;
}
std::vector<ParameterSample> BeamScan::drawDistribution(IDistribution1D* distrib,
double point) const
{
if (!distrib)
return {{point, 1}};
distrib->setMean(point);
return distrib->distributionSamples();
}
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