/**
* Update the shape cache if necessary
* @param det :: a pointer to the detector to query
* @param detRadius :: An output parameter that contains the detector radius
* @param detAxis :: An output parameter that contains the detector axis vector
*/
void He3TubeEfficiency::getDetectorGeometry(const Geometry::IDetector &det,
double &detRadius,
Kernel::V3D &detAxis) {
boost::shared_ptr<const Geometry::Object> shape_sptr = det.shape();
if (!shape_sptr) {
throw std::runtime_error(
"Detector geometry error: detector with id: " +
std::to_string(det.getID()) +
" does not have shape. Is this a detectors group?\n"
"The algorithm works for instruments with one-to-one "
"spectra-to-detector maps only!");
}
std::map<const Geometry::Object *,
std::pair<double, Kernel::V3D>>::const_iterator it =
this->shapeCache.find(shape_sptr.get());
if (it == this->shapeCache.end()) {
double xDist = distToSurface(Kernel::V3D(DIST_TO_UNIVERSE_EDGE, 0, 0),
shape_sptr.get());
double zDist = distToSurface(Kernel::V3D(0, 0, DIST_TO_UNIVERSE_EDGE),
shape_sptr.get());
if (std::abs(zDist - xDist) < 1e-8) {
detRadius = zDist / 2.0;
detAxis = Kernel::V3D(0, 1, 0);
// assume radii in z and x and the axis is in the y
PARALLEL_CRITICAL(deteff_shapecachea) {
this->shapeCache.insert(
std::pair<const Geometry::Object *, std::pair<double, Kernel::V3D>>(
shape_sptr.get(),
std::pair<double, Kernel::V3D>(detRadius, detAxis)));
}
return;
}
/** Method calculates averaged polar coordinates of the detector's group
(which may consist of one detector)
*@param det -- reference to the Mantid Detector
*@param Observer -- sample position or the centre of the polar system of
coordinates to calculate detector's parameters.
*@param Detector -- return Detector class containing averaged polar coordinates
of the detector or detector's group in
spherical coordinate system with centre at Observer
*/
void FindDetectorsPar::calcDetPar(const Geometry::IDetector &det,
const Kernel::V3D &Observer,
DetParameters &Detector) {
// get number of basic detectors within the composit detector
size_t nDetectors = det.nDets();
// define summator
AvrgDetector detSum;
// do we want spherical or linear box sizes?
detSum.setUseSpherical(!m_SizesAreLinear);
if (nDetectors == 1) {
detSum.addDetInfo(det, Observer);
} else {
// access contributing detectors;
auto detGroup = dynamic_cast<const Geometry::DetectorGroup *>(&det);
if (!detGroup) {
g_log.error() << "calc_cylDetPar: can not downcast IDetector_sptr to "
"detector group for det->ID: "
<< det.getID() << '\n';
throw(std::bad_cast());
}
for (const auto &det : detGroup->getDetectors()) {
detSum.addDetInfo(*det, Observer);
}
}
// calculate averages and return the detector parameters
detSum.returnAvrgDetPar(Detector);
}
/**
* Return the efixed for this detector. In Direct mode this has to be property
set up earlier and in Indirect mode it may be the property of a component
if not specified globally for the
instrument.
* @param det A pointer to a detector object
* @return The value of efixed
*/
double SofQCommon::getEFixed(const Geometry::IDetector &det) const {
double efixed(0.0);
if (m_emode == 1) // Direct
{
efixed = m_efixed;
} else // Indirect
{
if (m_efixedGiven)
efixed = m_efixed; // user provided a value
else {
const std::vector<double> param = det.getNumberParameter("EFixed");
if (param.empty())
throw std::runtime_error(
"Cannot find EFixed parameter for component \"" + det.getName() +
"\". This is required in indirect mode. Please check the IDF "
"contains these values.");
efixed = param[0];
}
}
return efixed;
}
/** method to cacluate the detectors parameters and add them to the detectors
*averages
*@param det -- reference to the Mantid Detector
*@param Observer -- sample position or the centre of the polar system of
*coordinates to calculate detector's parameters.
*/
void AvrgDetector::addDetInfo(const Geometry::IDetector &det,
const Kernel::V3D &Observer) {
m_nComponents++;
Kernel::V3D detPos = det.getPos();
Kernel::V3D toDet = (detPos - Observer);
double dist2Det, Polar, Azimut, ringPolar, ringAzim;
// identify the detector' position in the beam coordinate system:
toDet.getSpherical(dist2Det, Polar, Azimut);
if (m_nComponents <= 1) {
m_FlightPathSum = dist2Det;
m_PolarSum = Polar;
m_AzimutSum = Azimut;
m_AzimBase = Polar;
m_PolarBase = Azimut;
ringPolar = Polar;
ringAzim = Azimut;
} else {
ringPolar = nearAngle(m_AzimBase, Polar);
ringAzim = nearAngle(m_PolarBase, Azimut);
m_FlightPathSum += dist2Det;
m_PolarSum += ringPolar;
m_AzimutSum += ringAzim;
}
// centre of the azimuthal ring (the ring detectors form around the beam)
Kernel::V3D ringCentre(0, 0, toDet.Z());
// Get the bounding box
Geometry::BoundingBox bbox;
std::vector<Kernel::V3D> coord(3);
// ez along beamline, which is always oz;
Kernel::V3D er(0, 1, 0), ez(0, 0, 1);
if (dist2Det != 0.0)
er = toDet / dist2Det; // direction to the detector
// tangential to the ring and anticlockwise.
Kernel::V3D e_tg = er.cross_prod(ez);
if (e_tg.nullVector(1e-12)) {
e_tg = V3D(1., 0., 0.);
} else {
e_tg.normalize();
}
// make orthogonal -- projections are calculated in this coordinate system
ez = e_tg.cross_prod(er);
coord[0] = er; // new X
coord[1] = ez; // new y
coord[2] = e_tg; // new z
bbox.setBoxAlignment(ringCentre, coord);
det.getBoundingBox(bbox);
// linear extensions of the bounding box orientied tangentially to the equal
// scattering angle circle
double azimMin = bbox.zMin();
double azimMax = bbox.zMax();
double polarMin = bbox.yMin(); // bounding box has been rotated according to
// coord above, so z is along e_tg
double polarMax = bbox.yMax();
if (m_useSphericalSizes) {
if (dist2Det == 0)
dist2Det = 1;
// convert to angular units
double polarHalfSize =
rad2deg * atan2(0.5 * (polarMax - polarMin), dist2Det);
double azimHalfSize = rad2deg * atan2(0.5 * (azimMax - azimMin), dist2Det);
polarMin = ringPolar - polarHalfSize;
polarMax = ringPolar + polarHalfSize;
azimMin = ringAzim - azimHalfSize;
azimMax = ringAzim + azimHalfSize;
}
if (m_AzimMin > azimMin)
m_AzimMin = azimMin;
if (m_AzimMax < azimMax)
m_AzimMax = azimMax;
if (m_PolarMin > polarMin)
m_PolarMin = polarMin;
if (m_PolarMax < polarMax)
m_PolarMax = polarMax;
}
