FourHitFilter Class Reference

Filter for four hits. More...

#include <FourHitFilter.h>

Inheritance diagram for FourHitFilter:

Collaboration diagram for FourHitFilter:

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_CircleRadiusDifferenceCut = 10.
	Cut on difference of the two circle radii estimated from two triplets.
double	m_CircleCenterPositionDifferenceCut = 10.
	Cut on difference of the two circle center estimated from two triplets.
FourHitVariables	m_fourHitVariables
	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 four hits.

Basic working principle: use FourHitVariables and ThreeHitVariables and provide four (three B2Vector3D) to each variable. These are oHit (outer hit), coHit (middle outer hit), ciHit (middle inner hit) and iHit (inner hit) and then calculate the variables specified in FourHitVariables and ThreeHitVariables for the four positions

Definition at line 25 of file FourHitFilter.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_fourHitVariables.getCircleRadiusDifference() of the hit triplet is larger than m_CircleRadiusDifferenceCut Returns NAN if m_fourHitVariables.getCircleCenterPositionDifference() of the hit triplet is larger than m_CircleCenterPositionDifferenceCut Returns 1/m_fourHitVariables.getCircleRadiusDifference() else

Reimplemented from Filter< AObject >.

Definition at line 37 of file FourHitFilter.cc.

{
  const std::vector<TrackFindingCDC::WithWeight<const VXDHoughState*>>& previousHits = pair.first;
 
  // Do nothing if path is too short or too long
  if (previousHits.size() != 3) {
    return NAN;
  }
 
  const B2Vector3D& firstHitPos   = previousHits.at(0)->getHit()->getPosition();
  const B2Vector3D& secondHitPos  = previousHits.at(1)->getHit()->getPosition();
  const B2Vector3D& thirdHitPos   = previousHits.at(2)->getHit()->getPosition();
  const B2Vector3D& currentHitPos = pair.second->getHit()->getPosition();
 
  m_fourHitVariables.setHits(firstHitPos, secondHitPos, thirdHitPos, currentHitPos);
 
  if (m_fourHitVariables.getCircleRadiusDifference() > m_CircleRadiusDifferenceCut) {
    return NAN;
  }
  if (m_fourHitVariables.getCircleCenterPositionDifference() > m_CircleCenterPositionDifferenceCut) {
    return NAN;
  }
 
  return fabs(1.0 / m_fourHitVariables.getCircleRadiusDifference());
}

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/FourHitFilter.h
• tracking/vxdHoughTracking/filters/pathFilters/src/FourHitFilter.cc