MisalignmentCache Class Reference

Class to hold misalignment information. More...

#include <MisalignmentCache.h>

Collaboration diagram for MisalignmentCache:

Public Types
typedef std::unordered_map< Belle2::VxdID::baseType, TGeoHMatrix >	MisalignmentMap
	Hash map type to store existing misalignment transforms.
typedef std::tuple< bool, double, double >	MisalignmentShiftType
	Misalignment shift information contains a validity flag (if false, the misaligned object falls outside its sensor) and shifts in u and v.

Public Member Functions
	~MisalignmentCache ()
	destructor to clean up misalignment
void	clear ()
	clear cache data
void	readMisalignmentsFromXml (const std::string &filename)
	Read misalignment data from an xml file and store sensor misalignments. More...
void	addMisalignment (Belle2::VxdID sensorID, const TGeoHMatrix &misalignment)
	Add a new entry to the list of sensor misalignments. More...
const MisalignmentMap &	getMisalignments () const
	Return the list of sensor misalignments.
const TGeoHMatrix &	getMisalignmentTransform (Belle2::VxdID id) const
	Return the misalignment transform for a given sensor. More...
MisalignmentShiftType	getMisalignmentShift (const VXDTrueHit *hit)
	Return misalignment shift for a VXDTrueHit. More...

Static Public Member Functions
static MisalignmentShiftType	getMisalignment (const VXDTrueHit *hit)
	Return misalignment shift for a VXDTrueHit. More...
static MisalignmentCache &	getInstance ()
	Return a reference to the singleton instance.
static bool	isAlive ()
	Return alive status of the cache (are there misalignment data?

Private Member Functions
	MisalignmentCache ()
	Singleton class, hidden constructor.
	MisalignmentCache (const MisalignmentCache &)=delete
	Singleton class, no copying.
MisalignmentCache &	operator= (const MisalignmentCache &)=delete
	Singleton class, no assignment.

Private Attributes
bool	m_isAlive {false}
	Is the cache alive?
MisalignmentMap	m_misalignments
	Map to hold solid body misalignments for sensors.

Detailed Description

Class to hold misalignment information.

Definition at line 29 of file MisalignmentCache.h.

Member Function Documentation

addMisalignment()

void addMisalignment ( Belle2::VxdID  sensorID, const TGeoHMatrix &  misalignment  )

inline

Add a new entry to the list of sensor misalignments.

This method will manually add a new (VxdID, Transform3D) pair to the list.

Parameters

sensorID	Sensor identifier.
misalignment	3D transform to add to the list of sensor misalignments.

Definition at line 53 of file MisalignmentCache.h.

      {
        m_misalignments[sensorID] = misalignment;
        m_isAlive = true;
      }

getMisalignment()

static MisalignmentShiftType getMisalignment ( const VXDTrueHit *  hit )

inlinestatic

Return misalignment shift for a VXDTrueHit.

This is a shorthand for MisalignmentCache::getInstance().getMisalignmentShift.

Definition at line 78 of file MisalignmentCache.h.

getMisalignmentShift()

MisalignmentCache::MisalignmentShiftType getMisalignmentShift

(

const VXDTrueHit *

hit

)

Return misalignment shift for a VXDTrueHit.

This is the principal misalignment method, used to misalign TrueHits or Clusters (via relation to their TrueHits.

Parameters

hit	pointer to the TrueHit to misalign

Returns

std::pair<double, double> of misalignment shifts

Definition at line 100 of file MisalignmentCache.cc.

    {
      if (!m_isAlive || !hit) return make_tuple(false, 0.0, 0.0);
      VxdID sensorID = hit->getSensorID();
      const TGeoHMatrix& transform = getMisalignmentTransform(sensorID);
      // We need entry point as a reference - the point on the original track unaffected by passage through the sensor. We also don't care for w and set it to zero.
      const double xea[3] = {hit->getEntryU(), hit->getEntryV(), 0.0};
      ROOT::Math::XYZVector tev(hit->getEntryMomentum().Unit());
      const double tea[3] = {tev.X(), tev.Y(), tev.Z()};
      double xca[3], tca[3];
      transform.MasterToLocal(xea, xca);
      transform.MasterToLocalVect(tea, tca);
      if (abs(tca[2]) > 0.0) {
        double factor = - xca[2] / tca[2];
        double dx = xca[0] + factor * tca[0] - xea[0];
        double dy = xca[1] + factor * tca[1] - xea[1];
        return make_tuple(true, dx, dy);
      } else {
        return make_tuple(false, 0.0, 0.0);
      }
    }

getMisalignmentTransform()

const TGeoHMatrix & getMisalignmentTransform

(

Belle2::VxdID

id

)

const

Return the misalignment transform for a given sensor.

Parameters

id	VxdID of the desired sensor

Returns

identity transform if no data found.

Definition at line 29 of file MisalignmentCache.cc.

readMisalignmentsFromXml()

void readMisalignmentsFromXml

(

const std::string &

filename

)

Read misalignment data from an xml file and store sensor misalignments.

Parameters

filename

name of the xml file

Definition at line 40 of file MisalignmentCache.cc.

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

• vxd/geometry/include/MisalignmentCache.h
• vxd/geometry/src/MisalignmentCache.cc