TLineFitter Class Reference

A class to fit a TTrackBase object to a line. More...

#include <TLineFitter.h>

Inheritance diagram for TLineFitter:

Public Member Functions
	TLineFitter (const std::string &name)
	Constructor.
virtual	~TLineFitter ()
	Destructor.
void	dump (const std::string &message=std::string(""), const std::string &prefix=std::string("")) const
	dumps debug information.
double	a (void) const
double	b (void) const
double	det (void) const
virtual int	fit (TTrackBase &) const
	TLineFitter (const std::string &name)
	Constructor.
virtual	~TLineFitter ()
	Destructor.
void	dump (const std::string &message=std::string(""), const std::string &prefix=std::string("")) const
	dumps debug information.
double	a (void) const
double	b (void) const
double	det (void) const
virtual int	fit (TTrackBase &) const
	TLineFitter (const std::string &name)
	Constructor.
virtual	~TLineFitter ()
	Destructor.
void	dump (const std::string &message=std::string(""), const std::string &prefix=std::string("")) const
	dumps debug information.
double	a (void) const
double	b (void) const
double	det (void) const
virtual int	fit (TTrackBase &) const
Public Member Functions inherited from TMFitter
	TMFitter (const std::string &name)
	Constructor.
virtual	~TMFitter ()
	Destructor.
const std::string &	name (void) const
	returns name.
void	dump (const std::string &message=std::string(""), const std::string &prefix=std::string("")) const
	TMFitter (const std::string &name)
	Constructor.
virtual	~TMFitter ()
	Destructor.
const std::string &	name (void) const
	returns name.
void	dump (const std::string &message=std::string(""), const std::string &prefix=std::string("")) const
	TMFitter (const std::string &name)
	Constructor.
virtual	~TMFitter ()
	Destructor.
const std::string &	name (void) const
	returns name.
void	dump (const std::string &message=std::string(""), const std::string &prefix=std::string("")) const

Additional Inherited Members
Protected Member Functions inherited from TMFitter
void	fitDone (TTrackBase &) const
	sets the fitted flag. (Bad implementation)
void	fitDone (TTrackBase &) const
	sets the fitted flag. (Bad implementation)
void	fitDone (TTrackBase &) const
	sets the fitted flag. (Bad implementation)

Detailed Description

A class to fit a TTrackBase object to a line.

Definition at line 28 of file InstallArea/x86_64-el9-gcc13-dbg/include/TrkReco/TLineFitter.h.

Constructor & Destructor Documentation

TLineFitter() [1/3]

TLineFitter::TLineFitter

(

const std::string &

name

)

Constructor.

Definition at line 18 of file TLineFitter.cxx.

    : TMFitter( name ), _a( 0. ), _b( 0. ), _det( 0. ) {}

Referenced by TRobustLineFitter::TRobustLineFitter().

~TLineFitter() [1/3]

TLineFitter::~TLineFitter ( )

virtual

Destructor.

Definition at line 21 of file TLineFitter.cxx.

{}

TLineFitter() [2/3]

TLineFitter::TLineFitter

(

const std::string &

name

)

Constructor.

~TLineFitter() [2/3]

virtual TLineFitter::~TLineFitter ( )

virtual

Destructor.

TLineFitter() [3/3]

TLineFitter::TLineFitter

(

const std::string &

name

)

Constructor.

~TLineFitter() [3/3]

virtual TLineFitter::~TLineFitter ( )

virtual

Destructor.

Member Function Documentation

a() [1/3]

double TLineFitter::a ( void ) const

inline

Definition at line 65 of file InstallArea/x86_64-el9-gcc13-dbg/include/TrkReco/TLineFitter.h.

{ return _a; }

Referenced by TRobustLineFitter::fit().

a() [2/3]

double TLineFitter::a

(

void

)

const

a() [3/3]

double TLineFitter::a

(

void

)

const

b() [1/3]

double TLineFitter::b ( void ) const

inline

Definition at line 67 of file InstallArea/x86_64-el9-gcc13-dbg/include/TrkReco/TLineFitter.h.

{ return _b; }

Referenced by TRobustLineFitter::fit().

b() [2/3]

double TLineFitter::b

(

void

)

const

b() [3/3]

double TLineFitter::b

(

void

)

const

det() [1/3]

double TLineFitter::det ( void ) const

inline

Definition at line 69 of file InstallArea/x86_64-el9-gcc13-dbg/include/TrkReco/TLineFitter.h.

{ return _det; }

Referenced by TRobustLineFitter::fit().

det() [2/3]

double TLineFitter::det

(

void

)

const

det() [3/3]

double TLineFitter::det

(

void

)

const

dump() [1/3]

void TLineFitter::dump	(	const std::string &	message = std::string(""),
		const std::string &	prefix = std::string("") ) const

dumps debug information.

dump() [2/3]

void TLineFitter::dump	(	const std::string &	message = std::string(""),
		const std::string &	prefix = std::string("") ) const

dumps debug information.

dump() [3/3]

void TLineFitter::dump	(	const std::string &	message = std::string(""),
		const std::string &	prefix = std::string("") ) const

dumps debug information.

fit() [1/3]

int TLineFitter::fit ( TTrackBase & t ) const

virtual

Implements TMFitter.

Reimplemented in TRobustLineFitter, TRobustLineFitter, and TRobustLineFitter.

Definition at line 23 of file TLineFitter.cxx.

                                          {
 
  //...Already fitted ?...
  if ( t.fitted() ) return TFitAlreadyFitted;
 
  //...Check # of hits...
  if ( t.links().length() < 2 ) return TFitErrorFewHits;
 
  unsigned n = t.links().length();
  if ( _det == 0. && n == 2 )
  {
    double x0 = t.links()[0]->position().x();
    double y0 = t.links()[0]->position().y();
    double x1 = t.links()[1]->position().x();
    double y1 = t.links()[1]->position().y();
    if ( x0 == x1 ) return TFitFailed;
    _a = ( y0 - y1 ) / ( x0 - x1 );
    _b = -_a * x1 + y1;
  }
  else
  {
    double sum  = (double)n;
    double sumX = 0., sumY = 0., sumX2 = 0., sumXY = 0., sumY2 = 0.;
    for ( unsigned i = 0; i < n; i++ )
    {
      const HepPoint3D& p = t.links()[i]->position();
      double            x = p.x();
      double            y = p.y();
      sumX += x;
      sumY += y;
      sumX2 += x * x;
      sumXY += x * y;
      sumY2 += y * y;
    }
 
    _det = sum * sumX2 - sumX * sumX;
#ifdef TRKRECO_DEBUG_DETAIL
    cout << "        TLineFitter::fit ... det=" << _det << std::endl;
#endif
    if ( _det == 0. ) { return TFitFailed; }
    else
    {
      _a = ( sumXY * sum - sumX * sumY ) / _det;
      _b = ( sumX2 * sumY - sumX * sumXY ) / _det;
    }
  }
 
  if ( t.objectType() == Line ) ( (TMLine&)t ).property( _a, _b, _det );
  fitDone( t );
  return 0;
}

Referenced by TRobustLineFitter::fit().

fit() [2/3]

virtual int TLineFitter::fit ( TTrackBase & ) const

virtual

Implements TMFitter.

Reimplemented in TRobustLineFitter, TRobustLineFitter, and TRobustLineFitter.

fit() [3/3]

virtual int TLineFitter::fit ( TTrackBase & ) const

virtual

Implements TMFitter.

Reimplemented in TRobustLineFitter, TRobustLineFitter, and TRobustLineFitter.

---

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

• InstallArea/x86_64-el9-gcc13-dbg/include/TrkReco/TLineFitter.h
• InstallArea/x86_64-el9-gcc13-opt/include/TrkReco/TLineFitter.h
• Reconstruction/TrkReco/include/TrkReco/TLineFitter.h
• TLineFitter.cxx