org.lcsim.recon.tracking.trfbase

Class VTrack

java.lang.Object

org.lcsim.recon.tracking.trfbase.VTrack

Direct Known Subclasses:

ETrack

public class VTrack
extends Object

A Track vector without error.

Data includes a surface _srf, a 5-vector _vec and a direction.

The direction attribute is initially set undefined and may be defined with methods set_backward() or set_forward(). However, the actual direction of the track as returned by is_valid(), is_forward() and is_backward() is obtained by asking the surface. The direction attribute is used only if the surface returns undefined.

Version:

1.0

Author:

Norman A. Graf

Field Summary

Fields

Modifier and Type	Field and Description
(package private) TrackSurfaceDirection	_dir
(package private) boolean	_forward
(package private) Surface	_srf
(package private) TrackVector	_vec

Constructor Summary

Constructors

Constructor and Description
VTrack() Default constructor.
VTrack(Surface srf) construct a track vector from a surface
VTrack(Surface srf, TrackVector vec) constructor from a surface and a vector
VTrack(Surface srf, TrackVector vec, TrackSurfaceDirection dir) constructor from a surface, vector and direction
VTrack(VTrack trv) copy constructor

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(VTrack vtrk) Equality
boolean	isBackward() is track direction opposite that of surface? surface direction takes priority over local value
boolean	isForward() is track direction same as surface surface direction takes priority over local value
boolean	isTrackBackward() return the pure track direction
boolean	isTrackForward() return the pure track direction
boolean	isValid() Return true if track is valid.
boolean	notEquals(VTrack vtrk) Inequality
double	qOverP() Return q/p in 1/GeV/c.
void	setBackward() set direction backward
void	setForward() set direction forward
void	setSurface(Surface srf) set surface direction attribute is set undefined
void	setTrackBackward() set the pure track direction backwards
void	setTrackForward() set the pure track direction forwards
void	setVector(TrackVector vec) set track vector direction attribute is set undefined
void	setVectorAndKeepDirection(TrackVector vec) set vector and keep the current direction
SpacePath	spacePath() the track position and direction
SpacePoint	spacePoint() return the track position
Surface	surface() get surface
String	toString() String representation of the VTrack
TrackVector	vector() get track vector
double	vector(int i) return a component of the vector

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

_srf

Surface _srf

_vec

TrackVector _vec

_dir

TrackSurfaceDirection _dir

_forward

boolean _forward

Constructor Detail

VTrack

public VTrack()

Default constructor. Leaves track in invalid state.

VTrack

public VTrack(Surface srf)

construct a track vector from a surface

Parameters:

srf - Surface

VTrack

public VTrack(Surface srf,
      TrackVector vec)

constructor from a surface and a vector

Parameters:

srf - Surface at which track is defined

vec - TrackVector of track parameters

VTrack

public VTrack(Surface srf,
      TrackVector vec,
      TrackSurfaceDirection dir)

constructor from a surface, vector and direction

Parameters:

srf - Surface at which track is defined

vec - TrackVector of track parameters

dir - TrackSurfaceDirection of direction

VTrack

public VTrack(VTrack trv)

copy constructor

Parameters:

trv - VTrack to copy

Method Detail

isValid

public boolean isValid()

Return true if track is valid. To be valid, the surface and direction must be defined.

Returns:

true if track surface and direction are defined

setSurface

public void setSurface(Surface srf)

set surface direction attribute is set undefined

Parameters:

srf - Surface at which track will be defined

surface

public Surface surface()

get surface

Returns:

Surface at which track is defined

setVector

public void setVector(TrackVector vec)

set track vector direction attribute is set undefined

Parameters:

vec - TrackVector containing track parameters

setVectorAndKeepDirection

public void setVectorAndKeepDirection(TrackVector vec)

set vector and keep the current direction

Parameters:

vec - TrackVector containing track parameters

vector

public TrackVector vector()

get track vector

Returns:

TrackVector containing track parameters

vector

public double vector(int i)

return a component of the vector

Parameters:

i - track component to return

Returns:

the value of the track vector component i

setForward

public void setForward()

set direction forward

setBackward

public void setBackward()

set direction backward

isForward

public boolean isForward()

is track direction same as surface surface direction takes priority over local value

Returns:

true if track direction is forward

setTrackForward

public void setTrackForward()

set the pure track direction forwards

isTrackForward

public boolean isTrackForward()

return the pure track direction

Returns:

true if the pure track direction is forward

isBackward

public boolean isBackward()

is track direction opposite that of surface? surface direction takes priority over local value

Returns:

true if track direction is opposite that of Surface

setTrackBackward

public void setTrackBackward()

set the pure track direction backwards

isTrackBackward

public boolean isTrackBackward()

return the pure track direction

Returns:

true if pure track direction is backward

spacePoint

public SpacePoint spacePoint()

return the track position

Returns:

the SpacePoint position of the track on the Surface

spacePath

public SpacePath spacePath()

the track position and direction

Returns:

get the SpaceVector position and direction of the track on the Surface

qOverP

public double qOverP()

Return q/p in 1/GeV/c.

Returns:

the track charge over momentum

toString

public String toString()

String representation of the VTrack

Overrides:

toString in class Object

Returns:

String representation of the VTrack

equals

public boolean equals(VTrack vtrk)

Equality

Parameters:

vtrk - VTrack to compare with

Returns:

true if this equals vtrk

notEquals

public boolean notEquals(VTrack vtrk)

Inequality

Parameters:

vtrk - VTrack to compare

Returns:

true if this does not equal vtrk