ThreeHitFilter Class Reference

Filter for three hits. More...

#include <ThreeHitFilter.h>

Inheritance diagram for ThreeHitFilter:

Collaboration diagram for ThreeHitFilter:

Public Types
using	Object = AObject
	Type of the object to be analysed.
using	Interface = Filter< AObject >
	Mark this class as the basic interface.

Public Member Functions
TrackFindingCDC::Weight	operator() (const BasePathFilter::Object &pair) override
	Return the weight based on the ThreeHitVariables. More...
void	exposeParameters (ModuleParamList *moduleParamList, const std::string &prefix) override
	Expose the parameters.
void	beginRun () override
	set BField value for estimator
virtual bool	needsTruthInformation ()
	Indicates if the filter requires Monte Carlo information.
Weight	operator() (const Object *obj)
	Function to evaluate the object. More...
void	initialize () override
	Receive and dispatch signal before the start of the event processing.
void	beginEvent () override
	Receive and dispatch signal for the start of a new event.
void	endRun () override
	Receive and dispatch signal for the end of the run.
void	terminate () override
	Receive and dispatch Signal for termination of the event processing.

Protected Member Functions
void	addProcessingSignalListener (ProcessingSignalListener *psl)
	Register a processing signal listener to be notified.
int	getNProcessingSignalListener ()
	Get the number of currently registered listeners.

Private Types
using	Super = ProcessingSignalListener
	Type of the base class.

Private Attributes
double	m_cosRZCut = 0.95
	cut for cosine in RZ between the two vectors (oHit - cHit) and (cHit - iHit)
double	m_circleIPDistanceCut = 2.0
	cut on the difference between circle radius and circle center position in the x-y plane to check if the track is compatible with passing through the IP
ThreeHitVariables	m_threeHitVariables
	Construct empty ThreeHitVariables instance.
std::vector< ProcessingSignalListener * >	m_subordinaryProcessingSignalListeners
	References to subordinary signal processing listener contained in this findlet.
bool	m_initialized = false
	Flag to keep track whether initialization happend before.
bool	m_terminated = false
	Flag to keep track whether termination happend before.
std::string	m_initializedAs
	Name of the type during initialisation.

Detailed Description

Filter for three hits.

Basic working principle: use ThreeHitVariables and provide three B2Vector3D to each variable. These are oHit (outer hit), cHit (middle hit), and iHit (inner hit) and then calculate the variables specified in ThreeHitVariables using the three positions, often using the difference (oHit - cHit) and (cHit - iHit).

Definition at line 26 of file ThreeHitFilter.h.

Member Function Documentation

operator()() [1/2]

TrackFindingCDC::Weight operator() ( const BasePathFilter::Object &  pair )

overridevirtual

Return the weight based on the ThreeHitVariables.

Returns NAN if m_threeHitVariables.getCosAngleRZSimple() of the hit triplet is smaller than m_cosRZCut Returns NAN if m_threeHitVariables.getCircleDistanceIP() of the hit triplet is larger than m_circleIPDistanceCut Returns 1/m_threeHitVariables.getCircleDistanceIP() else

Reimplemented from Filter< AObject >.

Definition at line 35 of file ThreeHitFilter.cc.

{
  const std::vector<TrackFindingCDC::WithWeight<const VXDHoughState*>>& previousHits = pair.first;
 
  // Do nothing if path is too short or too long
  if (previousHits.size() != 2) {
    return NAN;
  }
 
  const B2Vector3D& firstHitPos   = previousHits.at(0)->getHit()->getPosition();
  const B2Vector3D& secondHitPos  = previousHits.at(1)->getHit()->getPosition();
  const B2Vector3D& currentHitPos = pair.second->getHit()->getPosition();
 
  m_threeHitVariables.setHits(firstHitPos, secondHitPos, currentHitPos);
 
  if (m_threeHitVariables.getCosAngleRZSimple() < m_cosRZCut) {
    return NAN;
  }
 
  const double circleDistanceIP = m_threeHitVariables.getCircleDistanceIP();
 
  if (circleDistanceIP > m_circleIPDistanceCut) {
    return NAN;
  }
 
  return fabs(1.0 / circleDistanceIP);
}

operator()() [2/2]

Weight operator() ( const Object *  obj )

inherited

Function to evaluate the object.

Base implementation accepts all objects, except nullptr.

Parameters

obj	The object to be accepted or rejected.

Returns

A finit float value if the object is accepted. NAN if the object is rejected. Nullptr is always rejected.

Definition at line 58 of file Filter.icc.h.

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

• tracking/vxdHoughTracking/filters/pathFilters/include/ThreeHitFilter.h
• tracking/vxdHoughTracking/filters/pathFilters/src/ThreeHitFilter.cc