org.lcsim.recon.tracking.trfcyl

Class ClusterFindCyl

java.lang.Object

org.lcsim.recon.tracking.trflayer.ClusterFinder

org.lcsim.recon.tracking.trflayer.ClusterFindManager

org.lcsim.recon.tracking.trfcyl.ClusterFindCyl

public class ClusterFindCyl
extends ClusterFindManager

Cluster finder for a cylindrical layer. It maintains a map of clusters of type HitCylPhi or HitCylPhiZ indexed by position so the clusters near a track can be retrieved quickly.

A track is defined to be near a cluster if the chi-square difference between the corresponding hit measurement and prediction is less than _max_chsq_diff.

Version:

1.0

Author:

Norman A. Graf

Field Summary

Fields

Modifier and Type	Field and Description
private TreeMap	_clusters
private double	_max_chsq_diff
private SurfCylinder	_scy
private double	_stereo

Constructor Summary

Constructors

Constructor and Description
ClusterFindCyl(double radius, double stereo, double max_chsq_diff) Construct an instance from the cylindrical radius, the stereo angle, and the maximum chi-square difference which defines the nearness of a hit to a track.

Method Summary

Methods

Modifier and Type	Method and Description
int	addCluster(Cluster clus) Add a cluster to this ClusterFindManager.
private static double	chsqDiff(Cluster clu, ETrack tre)
List	clusters() Return all the clusters.
List	clusters(ETrack tre) Return all the clusters near a track at the surface.
void	dropClusters() Drop all clusters from this manager.
double	maxChsqDiff() Return the maximum chi-square difference which defines a hit to be near a track.
double	radius() Return the radius of the cylinder.
static String	staticType() Return a String representation of the class' type name.
double	stereo() Return the stereo slope.
Surface	surface() Return the surface.
String	toString() output stream
String	type() Return a String representation of the class' type name.
static String	typeName() Return a String representation of the class' type name.

Methods inherited from class org.lcsim.recon.tracking.trflayer.ClusterFinder

genericType

Methods inherited from class java.lang.Object

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

Field Detail

_scy

private SurfCylinder _scy

_stereo

private double _stereo

_max_chsq_diff

private double _max_chsq_diff

_clusters

private TreeMap _clusters

Constructor Detail

ClusterFindCyl

public ClusterFindCyl(double radius,
              double stereo,
              double max_chsq_diff)

Construct an instance from the cylindrical radius, the stereo angle, and the maximum chi-square difference which defines the nearness of a hit to a track.

Parameters:

radius - The radius of the cylinder.

stereo - The stereo angle of the measurement (0 if axial only measurements).

max_chsq_diff - The maximum chi-square for a track-hit association.

Method Detail

typeName

public static String typeName()

Return a String representation of the class' type name. Included for completeness with the C++ version.

Returns:

A String representation of the class' type name.

staticType

public static String staticType()

Return a String representation of the class' type name. Included for completeness with the C++ version.

Returns:

A String representation of the class' type name.

type

public String type()

Return a String representation of the class' type name. Included for completeness with the C++ version.

Returns:

A String representation of the class' type name.

radius

public double radius()

Return the radius of the cylinder.

Returns:

The radius of this cylinder.

stereo

public double stereo()

Return the stereo slope.

Returns:

The stereo angle.

maxChsqDiff

public double maxChsqDiff()

Return the maximum chi-square difference which defines a hit to be near a track.

Returns:

The maximum chi-square for a track-hit association.

addCluster

public int addCluster(Cluster clus)

Add a cluster to this ClusterFindManager. The cluster must be of type ClusCylPhi or ClusCylPhiZ.

Specified by:

addCluster in class ClusterFindManager

Parameters:

clus - The Cluster to add.

Returns:

0 if successful.

dropClusters

public void dropClusters()

Drop all clusters from this manager.

Specified by:

dropClusters in class ClusterFindManager

surface

public Surface surface()

Return the surface.

Specified by:

surface in class ClusterFinder

Returns:

The Surface associated to this manager.

clusters

public List clusters()

Return all the clusters.

Specified by:

clusters in class ClusterFinder

Returns:

The list of clusters managed by this manager.

clusters

public List clusters(ETrack tre)

Return all the clusters near a track at the surface. Nearness is delimited by the maximum chi-squared between the track prediction and the cluster measurement. Clusters have been ordered by phi or phiz in range (0,2pi). need to check! The nearby subset is returned in the same order.

Specified by:

clusters in class ClusterFinder

Parameters:

tre - The ETrack for which to return clusters.

Returns:

A list of clusters near the track tre.

toString

public String toString()

output stream

Overrides:

toString in class Object

Returns:

A String representation of this instance.

chsqDiff

private static double chsqDiff(Cluster clu,
              ETrack tre)