Package cnuphys.swim

Class SwimTrajectory

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<E>

java.util.ArrayList<double[]>

cnuphys.swim.SwimTrajectory

All Implemented Interfaces:

Serializable, Cloneable, Iterable<double[]>, Collection<double[]>, List<double[]>, RandomAccess

public class SwimTrajectory
extends ArrayList<double[]>
implements Serializable

Combines a generated particle record with a path (trajectory). A trajectory is a collection of state vectors. A state vector is the six component vector:
Q = [x, y, z, px/p, py/p, pz/p]

Author:

heddle

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final int	BXDL_IDX	index for the accumulated integral |B x dL| component (kG-m)
static final int	DIRCOSX_IDX	index for the px/p direction cosine
static final int	DIRCOSY_IDX	index for the py/p direction cosine
static final int	DIRCOSZ_IDX	index for the pz/p direction cosine
static final int	PATHLEN_IDX	index for the accumulated path length (m)
Object	userObject	user object
static final int	X_IDX	index for the x component (m)
static final int	Y_IDX	index for the y component (m)
static final int	Z_IDX	index for the z component (m)

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor	Description
SwimTrajectory()	Create a swim trajectory with no initial content
SwimTrajectory(int charge, double xo, double yo, double zo, double momentum, double theta, double phi)	Create a one point trajectory.
SwimTrajectory(int charge, double xo, double yo, double zo, double momentum, double theta, double phi, int initialCapacity)
SwimTrajectory(GeneratedParticleRecord genPartRec, int initialCapacity)

Method Summary

Modifier and Type	Method	Description
boolean	add(double[] u)
boolean	add(double[] u, double s)
void	add(double xo, double yo, double zo, double momentum, double theta, double phi)
void	clear()	Clear the trajectory
void	computeBDL(FieldProbe probe)	Compute the integral B cross dl.
double[]	getArray(int index)	Get an array of elements of the state vector
double	getAveragePhi()	Get the average phi for this trajectory based on positions, not directions
double	getComputedBDL()	Get the total BDL integral if computed
double	getFinalR()	Get the final radial coordinate
GeneratedParticleRecord	getGeneratedParticleRecord()	Get the underlying generated particle record
LundId	getLundId()	Get the lund id.
double	getOriginalPhi()	Get the original phi for this trajectory
double	getOriginalTheta()	Get the original theta for this trajectory
double	getR(int index)	Get the r coordinate in cm for the given index
String	getSource()	Get the source of the trajectory e.g. hbtracking
double[]	getX()
double[]	getY()
double[]	getZ()
boolean	isBDLComputed()	Check whether the accumulated integral bdl has been computed
double[]	lastElement()	Get the last element
void	print(PrintStream ps)
void	sectorComputeBDL(int sector, RotatedCompositeProbe probe)	Compute the integral B cross dl.
void	setGeneratedParticleRecord(GeneratedParticleRecord genPart)	Set the generated particle record
void	setLundId(LundId lundId)	Set the lund id.
void	setSource(String source)	Set the source of the trajectory e.g. hbtracking

Methods inherited from class java.util.ArrayList

add, addAll, addAll, clone, contains, ensureCapacity, equals, forEach, get, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, removeIf, removeRange, replaceAll, retainAll, set, size, sort, spliterator, subList, toArray, toArray, trimToSize

Methods inherited from class java.util.AbstractCollection

containsAll, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, stream, toArray

Methods inherited from interface java.util.List

containsAll

Field Details

X_IDX

public static final int X_IDX

index for the x component (m)

See Also:

• Constant Field Values

Y_IDX

public static final int Y_IDX

index for the y component (m)

See Also:

• Constant Field Values

Z_IDX

public static final int Z_IDX

index for the z component (m)

See Also:

• Constant Field Values

DIRCOSX_IDX

public static final int DIRCOSX_IDX

index for the px/p direction cosine

See Also:

• Constant Field Values

DIRCOSY_IDX

public static final int DIRCOSY_IDX

index for the py/p direction cosine

See Also:

• Constant Field Values

DIRCOSZ_IDX

public static final int DIRCOSZ_IDX

index for the pz/p direction cosine

See Also:

• Constant Field Values

PATHLEN_IDX

public static final int PATHLEN_IDX

index for the accumulated path length (m)

See Also:

• Constant Field Values

BXDL_IDX

public static final int BXDL_IDX

index for the accumulated integral |B x dL| component (kG-m)

See Also:

• Constant Field Values

userObject

public Object userObject

user object

Constructor Details

SwimTrajectory

public SwimTrajectory()

Create a swim trajectory with no initial content

SwimTrajectory

public SwimTrajectory(int charge,
 double xo,
 double yo,
 double zo,
 double momentum,
 double theta,
 double phi)

Create a one point trajectory. Used hrn the initial momentum is lower than some minimum value.

Parameters:

charge - the charge of the particle (-1 for electron, +1 for proton, etc.)

xo - the x vertex position in m

yo - the y vertex position in m

zo - the z vertex position in m

momentum - initial momentum in GeV/c

theta - initial polar angle in degrees

phi - initial azimuthal angle in degrees

SwimTrajectory

public SwimTrajectory(int charge,
 double xo,
 double yo,
 double zo,
 double momentum,
 double theta,
 double phi,
 int initialCapacity)

Parameters:

charge - the charge of the particle (-1 for electron, +1 for proton, etc.)

xo - the x vertex position in m

yo - the y vertex position in m

zo - the z vertex position in m

momentum - initial momentum in GeV/c

theta - initial polar angle in degrees

phi - initial azimuthal angle in degrees

initialCapacity - the initial capacity of the trajectory list

SwimTrajectory

public SwimTrajectory(GeneratedParticleRecord genPartRec,
 int initialCapacity)

Parameters:

genPartRec - the generated particle record

initialCapacity - the initial capacity of the trajectory list

Method Details

clear

public void clear()

Clear the trajectory

Specified by:

clear in interface Collection<double[]>

Specified by:

clear in interface List<double[]>

Overrides:

clear in class ArrayList<double[]>

setGeneratedParticleRecord

public void setGeneratedParticleRecord(GeneratedParticleRecord genPart)

Set the generated particle record

Parameters:

genPart - the generated particle record

setLundId

public void setLundId(LundId lundId)

Set the lund id. This is not needed for swimming, but is useful for ced or when MonteCarlo truth is known.

Parameters:

lundId - the Lund Id.

getLundId

public LundId getLundId()

Get the lund id. This is not needed for swimming, and may be null. It is useful for ced or when MonteCarlo truth is known. return the Lund Id.

getGeneratedParticleRecord

public GeneratedParticleRecord getGeneratedParticleRecord()

Get the underlying generated particle record

Returns:

the underlying generated particle record

getOriginalTheta

public double getOriginalTheta()

Get the original theta for this trajectory

Returns:

the original theta for this trajectory in degrees

getOriginalPhi

public double getOriginalPhi()

Get the original phi for this trajectory

Returns:

the original phi for this trajectory in degrees

getR

public double getR(int index)

Get the r coordinate in cm for the given index

Parameters:

index - the index

Returns:

the r coordinate

add

public boolean add(double[] u)

Specified by:

add in interface Collection<double[]>

Specified by:

add in interface List<double[]>

Overrides:

add in class ArrayList<double[]>

add

public boolean add(double[] u,
 double s)

add

public void add(double xo,
 double yo,
 double zo,
 double momentum,
 double theta,
 double phi)

Parameters:

xo - the x vertex position in m

yo - the y vertex position in m

zo - the z vertex position in m

momentum - initial momentum in GeV/c

theta - initial polar angle in degrees

phi - initial azimuthal angle in degrees

getAveragePhi

public double getAveragePhi()

Get the average phi for this trajectory based on positions, not directions

Returns:

the average phi value in degrees

lastElement

public double[] lastElement()

Get the last element

Returns:

the last element

getFinalR

public double getFinalR()

Get the final radial coordinate

Returns:

final radial coordinate in meters

getComputedBDL

public double getComputedBDL()

Get the total BDL integral if computed

Returns:

the total BDL integral in kG-m

computeBDL

public void computeBDL(FieldProbe probe)

Compute the integral B cross dl. This will cause the state vector arrays to expand by two, becoming [x, y, z, px/p, py/p, pz/p, l, bdl] where the 7th entry l is cumulative pathlength in m and the eighth entry bdl is the cumulative integral bdl in kG-m.

Parameters:

probe - the field getter

sectorComputeBDL

public void sectorComputeBDL(int sector,
 RotatedCompositeProbe probe)

Compute the integral B cross dl. This will cause the state vector arrays to expand by two, becoming [x, y, z, px/p, py/p, pz/p, l, bdl] where the 7th entry l is cumulative pathlength in m and the eighth entry bdl is the cumulative integral bdl in kG-m.

Parameters:

sector - sector 1..6

probe - the field getter

isBDLComputed

public boolean isBDLComputed()

Check whether the accumulated integral bdl has been computed

Returns:

true if the accumulated integral bdl has been computed

getSource

public String getSource()

Get the source of the trajectory e.g. hbtracking

Returns:

the source of the trajectory

setSource

public void setSource(String source)

Set the source of the trajectory e.g. hbtracking

Parameters:

source - the source of the trajectory

getArray

public double[] getArray(int index)

Get an array of elements of the state vector

Parameters:

index - the desired element index

Returns:

the array

getX

public double[] getX()

getY

public double[] getY()

getZ

public double[] getZ()

print

public void print(PrintStream ps)