org.lcsim.recon.tracking.trfzp

Class ClusFindZPlane1

java.lang.Object

org.lcsim.recon.tracking.trflayer.ClusterFinder

org.lcsim.recon.tracking.trflayer.ClusterFindManager

org.lcsim.recon.tracking.trfzp.ClusFindZPlane1

public class ClusFindZPlane1
extends ClusterFindManager

Cluster finder for a z plane. It maintains a map of clusters of type ZPlane1 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 SurfZPlane	_szp
private double	_wx
private double	_wy

Constructor Summary

Constructors

Constructor and Description
ClusFindZPlane1(double zpos, double wx, double wy, double max_chsq_diff) Construct an instance from the z location of the plane, the stereo angles for the x-y measurement, 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	chsq_diffzp1(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.
static String	staticType() Return a String representation of the class' type name.
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

_szp

private SurfZPlane _szp

_wx

private double _wx

_wy

private double _wy

_max_chsq_diff

private double _max_chsq_diff

_clusters

private TreeMap _clusters

Constructor Detail

ClusFindZPlane1

public ClusFindZPlane1(double zpos,
               double wx,
               double wy,
               double max_chsq_diff)

Construct an instance from the z location of the plane, the stereo angles for the x-y measurement, and the maximum chi-square difference which defines the nearness of a hit to a track.

Parameters:

zpos - The z position of the z plane.

wx - The stereo angle for the x measurement.

wy - The stereo angle for the y measurement.

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.

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 axy. 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.

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.

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.

toString

public String toString()

output stream

Overrides:

toString in class Object

Returns:

A String representation of this instance.

chsq_diffzp1

private static double chsq_diffzp1(Cluster clu,
                  ETrack tre)