Trk::Trk2DDistanceFinder Class Reference

Algotool which calculates the distance between the two tracks in 2d only, re-using the Trk2dDistanceSeeder tool, which is based on the analytic solution of the minimum distance between two circles. More...

#include <Trk2DDistanceFinder.h>

Inheritance diagram for Trk::Trk2DDistanceFinder:

Collaboration diagram for Trk::Trk2DDistanceFinder:

Public Member Functions
	Trk2DDistanceFinder (const std::string &t, const std::string &n, const IInterface *p)
virtual	~Trk2DDistanceFinder ()
virtual StatusCode	initialize () override
virtual StatusCode	finalize () override
virtual std::optional< TwoPoints >	CalculateMinimumDistance (const Trk::Perigee &, const Trk::Perigee &) const override final
	method to do the calculation starting from two MeasuredPerigees
virtual std::optional< TwoPoints >	CalculateMinimumDistance (const Trk::Track &, const Trk::Track &) const override final
	method to do the calculation starting from two tracks

Private Attributes
ToolHandle< Trk2dDistanceSeeder >	m_2ddistanceseeder
std::atomic< int >	m_numberOfMinimizationFailures

Detailed Description

Algotool which calculates the distance between the two tracks in 2d only, re-using the Trk2dDistanceSeeder tool, which is based on the analytic solution of the minimum distance between two circles.

Of the two possible solutions, in Trk2dDistanceSeeder the one which minimizes the distance in z is used. (not sure this is what we want to find an approximate beam spot position event by event during primary vertex finding).

Author

giaci.nosp@m.nto..nosp@m.piacq.nosp@m.uadi.nosp@m.o@cer.nosp@m.n.ch

Definition at line 38 of file Trk2DDistanceFinder.h.

Constructor & Destructor Documentation

Trk2DDistanceFinder()

Trk::Trk2DDistanceFinder::Trk2DDistanceFinder	(	const std::string &	t,
		const std::string &	n,
		const IInterface *	p )

Definition at line 28 of file Trk2DDistanceFinder.cxx.

                                                                                                       :
    base_class(t,n,p),
    m_2ddistanceseeder("Trk::Trk2dDistanceSeeder"),
    m_numberOfMinimizationFailures(0)
  {
    declareProperty("Trk2dDistanceSeeder",     m_2ddistanceseeder);
  }

~Trk2DDistanceFinder()

Trk::Trk2DDistanceFinder::~Trk2DDistanceFinder ( )

virtualdefault

Member Function Documentation

CalculateMinimumDistance() [1/2]

std::optional< ITrkDistanceFinder::TwoPoints > Trk::Trk2DDistanceFinder::CalculateMinimumDistance ( const Trk::Perigee & a, const Trk::Perigee & b ) const

finaloverridevirtual

method to do the calculation starting from two MeasuredPerigees

If successful, returns the points on the two tracks at minimum distance.

return value is true if calculation is successfull

Definition at line 60 of file Trk2DDistanceFinder.cxx.

  {
    std::pair<PointOnTrack,PointOnTrack> minpoints;
    Trk::TwoPoints points;
 
    try {
      minpoints=m_2ddistanceseeder->GetSeed(TwoTracks(a,b), &points);
    } catch (...) {
      ATH_MSG_WARNING( "Problem with 2d analytic minimum distance finder" );
      m_numberOfMinimizationFailures+=1;
      return std::nullopt;
    }
 
 
#ifdef SEEDNEWTONTRKDISTANCEFINDER_DEBUG
    ATH_MSG_DEBUG( "Returned a_phi " << minpoints.first.getPhiPoint() );
    ATH_MSG_DEBUG( "Returned b_phi " << minpoints.second.getPhiPoint() );
#endif
 
    return points;
 
  }

CalculateMinimumDistance() [2/2]

std::optional< ITrkDistanceFinder::TwoPoints > Trk::Trk2DDistanceFinder::CalculateMinimumDistance ( const Trk::Track & a, const Trk::Track & b ) const

finaloverridevirtual

method to do the calculation starting from two tracks

Definition at line 86 of file Trk2DDistanceFinder.cxx.

  {
    if (std::isnan(a.perigeeParameters()->parameters()[Trk::d0])||std::isnan(b.perigeeParameters()->parameters()[Trk::d0])) {
      ATH_MSG_ERROR( "Nan parameters in tracks. Cannot use them" );
      return std::nullopt;
    }
 
    return CalculateMinimumDistance(*(a.perigeeParameters()),*(b.perigeeParameters()));
  }

finalize()

StatusCode Trk::Trk2DDistanceFinder::finalize ( )

overridevirtual

Definition at line 50 of file Trk2DDistanceFinder.cxx.

  {
    ATH_MSG_DEBUG( "Finalize successful. Number of failed minimizations: " << m_numberOfMinimizationFailures << ". Few per events is OK!" );
    return StatusCode::SUCCESS;
  }

initialize()

StatusCode Trk::Trk2DDistanceFinder::initialize ( )

overridevirtual

Definition at line 38 of file Trk2DDistanceFinder.cxx.

  {
 
    //initialize number of failures to 0
    m_numberOfMinimizationFailures=0;
 
    ATH_CHECK( AlgTool::initialize() );
    ATH_CHECK( m_2ddistanceseeder.retrieve() );
    ATH_MSG_DEBUG( "Initialize successful" );
    return StatusCode::SUCCESS;
  }

Member Data Documentation

m_2ddistanceseeder

ToolHandle<Trk2dDistanceSeeder> Trk::Trk2DDistanceFinder::m_2ddistanceseeder

private

Definition at line 61 of file Trk2DDistanceFinder.h.

m_numberOfMinimizationFailures

std::atomic<int> Trk::Trk2DDistanceFinder::m_numberOfMinimizationFailures

mutableprivate

Definition at line 62 of file Trk2DDistanceFinder.h.

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

• Trk2DDistanceFinder.h
• Trk2DDistanceFinder.cxx