InDet::SCT_SpacePoint Class Reference

An SCT_SpacePoint is created from two SCT_Cluster's from two different wafers. More...

#include <SCT_SpacePoint.h>

Inheritance diagram for InDet::SCT_SpacePoint:

Collaboration diagram for InDet::SCT_SpacePoint:

Public Member Functions
	SCT_SpacePoint ()=default
	Default constructor.
const std::pair< IdentifierHash, IdentifierHash > &	elementIdList () const
	return the pair of Ids of the element by reference
const std::pair< const PrepRawData *, const PrepRawData * > &	clusterList () const
	return the pair of cluster pointers by reference
const	AmgSymMatrix (3) &globCovariance() const
	return the error matrix by reference The Matrix is calculated from the local Covariance Matrix when demanded and the cached
double	eta (double z0=0) const
	calculate eta (not cached), needs z0 info
double	r () const
	returns the r value of the SpacePoint's position (in cylindrical coordinates).
double	phi () const
	returns the phi value of the SpacePoint's position (in cylindrical coordinates).
virtual const Surface &	associatedSurface () const override final
	Interface method to get the associated Surface.
virtual const Amg::Vector3D &	globalPosition () const override final
	Interface method to get the global Position.
std::unique_ptr< SpacePoint >	uniqueClone () const
	Clone.
virtual bool	type (MeasurementBaseType::Type type) const override final
	Extended method checking the type.
const LocalParameters &	localParameters () const
	Interface method to get the LocalParameters.
const Amg::MatrixX &	localCovariance () const
	Interface method to get the localError.

Protected Member Functions
	AmgSymMatrix (3) m_globalCovariance
void	setupGlobalFromLocalCovariance ()
	set up the global covariance matrix by rotating the local one

Protected Attributes
std::pair< const PrepRawData *, const PrepRawData * >	m_clusList
std::pair< IdentifierHash, IdentifierHash >	m_elemIdList
Amg::Vector3D	m_position
LocalParameters	m_localParams
Amg::MatrixX	m_localCovariance

Parametrised constructors
In order to ensure initialisation, the global Position has to be on the surface associated to the FIRST member of the PRD-pair clusList.
	SCT_SpacePoint (const std::pair< IdentifierHash, IdentifierHash > &elementIdList, const Amg::Vector3D &position, const std::pair< const Trk::PrepRawData *, const Trk::PrepRawData * > &clusList)
	SCT_SpacePoint (const SCT_SpacePoint &)=default
	default move,copy,dtor
SCT_SpacePoint &	operator= (const SCT_SpacePoint &)=default
	SCT_SpacePoint (SCT_SpacePoint &&) noexcept=default
SCT_SpacePoint &	operator= (SCT_SpacePoint &&) noexcept=default
virtual	~SCT_SpacePoint ()=default
virtual Trk::SpacePoint *	clone () const override final
	Clones.
virtual MsgStream &	dump (MsgStream &out) const override final
	Interface method for output, to be overloaded by child classes*.
virtual std::ostream &	dump (std::ostream &out) const override final
	Interface method for output, to be overloaded by child classes*.
void	setupLocalCovarianceSCT ()
	method to set up the local Covariance Matrix.
void	setup (const std::pair< IdentifierHash, IdentifierHash > &elementIdList, const Amg::Vector3D &position, const std::pair< const Trk::PrepRawData *, const Trk::PrepRawData * > &clusList)
	common method used in constructors.

Detailed Description

An SCT_SpacePoint is created from two SCT_Cluster's from two different wafers.

Definition at line 31 of file SCT_SpacePoint.h.

Constructor & Destructor Documentation

SCT_SpacePoint() [1/4]

InDet::SCT_SpacePoint::SCT_SpacePoint ( )

default

Default constructor.

SCT_SpacePoint() [2/4]

InDet::SCT_SpacePoint::SCT_SpacePoint	(	const std::pair< IdentifierHash, IdentifierHash > &	elementIdList,
		const Amg::Vector3D &	position,
		const std::pair< const Trk::PrepRawData *, const Trk::PrepRawData * > &	clusList )

Definition at line 20 of file SCT_SpacePoint.cxx.

    : Trk::SpacePoint() {
  setup(elementIdList, position, clusList);
  setupLocalCovarianceSCT();
  setupGlobalFromLocalCovariance();
}

SCT_SpacePoint() [3/4]

InDet::SCT_SpacePoint::SCT_SpacePoint ( const SCT_SpacePoint & )

default

default move,copy,dtor

SCT_SpacePoint() [4/4]

InDet::SCT_SpacePoint::SCT_SpacePoint ( SCT_SpacePoint && )

defaultnoexcept

~SCT_SpacePoint()

virtual InDet::SCT_SpacePoint::~SCT_SpacePoint ( )

virtualdefault

Member Function Documentation

AmgSymMatrix() [1/2]

const Trk::SpacePoint::AmgSymMatrix ( 3 ) const &

inherited

return the error matrix by reference The Matrix is calculated from the local Covariance Matrix when demanded and the cached

AmgSymMatrix() [2/2]

Trk::SpacePoint::AmgSymMatrix ( 3 )

protectedinherited

associatedSurface()

const Surface & SpacePoint::associatedSurface ( ) const

finaloverridevirtualinherited

Interface method to get the associated Surface.

Implements Trk::MeasurementBase.

Definition at line 77 of file Tracking/TrkEvent/TrkSpacePoint/src/SpacePoint.cxx.

                                                     {
    assert(m_clusList.first->detectorElement());
    return m_clusList.first->detectorElement()->surface();
  }

clone()

Trk::SpacePoint * InDet::SCT_SpacePoint::clone ( ) const

inlinefinaloverridevirtual

Clones.

Implements Trk::SpacePoint.

Definition at line 84 of file SCT_SpacePoint.h.

                                                  {
  return new SCT_SpacePoint(*this);
}

clusterList()

const std::pair< const PrepRawData *, const PrepRawData * > & SpacePoint::clusterList ( ) const

inlineinherited

return the pair of cluster pointers by reference

Definition at line 127 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                              {
  return m_clusList;
}

dump() [1/2]

MsgStream & InDet::SCT_SpacePoint::dump ( MsgStream & out ) const

finaloverridevirtual

Interface method for output, to be overloaded by child classes*.

Implements Trk::SpacePoint.

Definition at line 69 of file SCT_SpacePoint.cxx.

                                                    {
  std::ostringstream os;
  dump(os);
  out << os.str();
  return out;
}

dump() [2/2]

std::ostream & InDet::SCT_SpacePoint::dump ( std::ostream & out ) const

finaloverridevirtual

Interface method for output, to be overloaded by child classes*.

Implements Trk::SpacePoint.

Definition at line 78 of file SCT_SpacePoint.cxx.

                                                      {
  const std::string lf{"\n"};  // linefeed
  out << "SCT_SpacePoint  contains: " << lf;
  out << "Identifier Hashes ( " << int(this->elementIdList().first) << " , ";
  out << int(this->elementIdList().second) << " ) " << lf;
  out << "Global Position:  " << Amg::toString(this->globalPosition(), 3) << lf;
  out << "Global Covariance Matrix " << Amg::toString(this->globCovariance(), 3)
      << lf;
  out << "Local Parameters " << this->localParameters() << lf;
  out << "Local Covariance " << Amg::toString(this->localCovariance()) << lf;
  out << "Cluster 1 :" << lf << (*this->clusterList().first) << lf;
  out << "Cluster 2 :" << lf << (*this->clusterList().second) << std::endl;
 
  return out;
}

elementIdList()

const std::pair< IdentifierHash, IdentifierHash > & SpacePoint::elementIdList ( ) const

inlineinherited

return the pair of Ids of the element by reference

Definition at line 122 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                {
  return m_elemIdList;
}

eta()

double SpacePoint::eta ( double z0 = 0 ) const

inlineinherited

calculate eta (not cached), needs z0 info

Definition at line 131 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                             {
  //  double zr = (m_z-z0)/m_r;
  double zr = (m_position.z() - z0) / m_position.perp();
  return std::log(zr + std::sqrt(1. + zr * zr));
}

globalPosition()

const Amg::Vector3D & SpacePoint::globalPosition ( ) const

inlinefinaloverridevirtualinherited

Interface method to get the global Position.

Implements Trk::MeasurementBase.

Definition at line 146 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                                           {
  return m_position;
}

localCovariance()

const Amg::MatrixX & Trk::MeasurementBase::localCovariance ( ) const

inlineinherited

Interface method to get the localError.

Definition at line 138 of file MeasurementBase.h.

{
  return m_localCovariance;
}

localParameters()

const Trk::LocalParameters & Trk::MeasurementBase::localParameters ( ) const

inlineinherited

Interface method to get the LocalParameters.

Definition at line 132 of file MeasurementBase.h.

{
  return m_localParams;
}

operator=() [1/2]

SCT_SpacePoint & InDet::SCT_SpacePoint::operator= ( const SCT_SpacePoint & )

default

operator=() [2/2]

SCT_SpacePoint & InDet::SCT_SpacePoint::operator= ( SCT_SpacePoint && )

defaultnoexcept

phi()

double SpacePoint::phi ( ) const

inlineinherited

returns the phi value of the SpacePoint's position (in cylindrical coordinates).

This is calculated once in the ctor and then cached

Definition at line 141 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                    {
  return m_position.phi();
}

r()

double SpacePoint::r ( ) const

inlineinherited

returns the r value of the SpacePoint's position (in cylindrical coordinates).

This is calculated once in the ctor and then cached

Definition at line 137 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                  {
  return m_position.perp();
}

setup()

void InDet::SCT_SpacePoint::setup ( const std::pair< IdentifierHash, IdentifierHash > & elementIdList, const Amg::Vector3D & position, const std::pair< const Trk::PrepRawData *, const Trk::PrepRawData * > & clusList )

private

common method used in constructors.

Definition at line 32 of file SCT_SpacePoint.cxx.

                  {
  m_clusList = clusList;
  m_position = position;
  m_elemIdList.first = elementIdList.first;
  m_elemIdList.second = elementIdList.second;
  assert((clusList.first != 0) && (clusList.second != 0));
  assert(clusList.first->detectorElement());
  std::optional<Amg::Vector2D> locpos{
      clusList.first->detectorElement()->surface().globalToLocal(position)};
  assert(locpos);
  Trk::MeasurementBase::m_localParams = Trk::LocalParameters(*locpos);
}

setupGlobalFromLocalCovariance()

ATH_FLATTEN void SpacePoint::setupGlobalFromLocalCovariance ( )

protectedinherited

set up the global covariance matrix by rotating the local one

Definition at line 63 of file Tracking/TrkEvent/TrkSpacePoint/src/SpacePoint.cxx.

                                                  {
    const Amg::MatrixX& lc = this->localCovariance();
 
    Eigen::Matrix3d cov;
 
    cov << lc(0, 0), lc(0, 1), 0., 
           lc(1, 0), lc(1, 1), 0.,
           // cppcheck-suppress constStatement
           0., 0., 0.;
 
    const Amg::RotationMatrix3D& R = associatedSurface().transform().rotation();
    m_globalCovariance = R * cov * R.transpose();
  }

setupLocalCovarianceSCT()

void InDet::SCT_SpacePoint::setupLocalCovarianceSCT ( )

private

method to set up the local Covariance Matrix.

Definition at line 51 of file SCT_SpacePoint.cxx.

                                             {
 
  /* For performance reason only, the error is assumed constant.
      numbers are taken from
      Trigger/TrigTools/TrigOfflineSpacePointTool/OfflineSpacePointProviderTool
   */
  constexpr double deltaY = 0.0004;  // roughly pitch of SCT (80 mu) / sqrt(12)
  constexpr double offdiag = 25. * deltaY;
  constexpr double elem11 = 1600. * deltaY;
  Amg::MatrixX cov(2, 2);
  cov << deltaY, offdiag,
      offdiag, elem11;
 
  Trk::MeasurementBase::m_localCovariance = std::move(cov);
}

type()

virtual bool Trk::SpacePoint::type ( MeasurementBaseType::Type type ) const

inlinefinaloverridevirtualinherited

Extended method checking the type.

Implements Trk::MeasurementBase.

Definition at line 87 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                                                       {
    return (type == MeasurementBaseType::SpacePoint);
  }

uniqueClone()

std::unique_ptr< SpacePoint > Trk::SpacePoint::uniqueClone ( ) const

inlineinherited

Clone.

Definition at line 82 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

                                                {
    return std::unique_ptr<SpacePoint>(clone());
  }

Member Data Documentation

m_clusList

std::pair<const PrepRawData*, const PrepRawData*> Trk::SpacePoint::m_clusList

protectedinherited

Definition at line 97 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

m_elemIdList

std::pair<IdentifierHash, IdentifierHash> Trk::SpacePoint::m_elemIdList

protectedinherited

Definition at line 98 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

m_localCovariance

Amg::MatrixX Trk::MeasurementBase::m_localCovariance

protectedinherited

Definition at line 112 of file MeasurementBase.h.

m_localParams

LocalParameters Trk::MeasurementBase::m_localParams

protectedinherited

Definition at line 111 of file MeasurementBase.h.

m_position

Amg::Vector3D Trk::SpacePoint::m_position

protectedinherited

Definition at line 99 of file Tracking/TrkEvent/TrkSpacePoint/TrkSpacePoint/SpacePoint.h.

---

The documentation for this class was generated from the following files:

• SCT_SpacePoint.h
• SCT_SpacePoint.cxx