org.lcsim.fit.twopointcircle

Class TwoPointCircleFitter

java.lang.Object

org.lcsim.fit.twopointcircle.TwoPointCircleFitter

public class TwoPointCircleFitter
extends Object

Author:

Richard Partridge

Field Summary

Fields

Modifier and Type	Field and Description
private List<TwoPointCircleFit>	_circlefits
private boolean	_debug
private static double	_eps
private TwoPointLineFit	_linefit
private double	_rmin
private static double	twopi

Constructor Summary

Constructors

Constructor and Description
TwoPointCircleFitter() Constructor with no minimum radius.
TwoPointCircleFitter(double rmin) Constructor specifying a minimum radius.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	FitCircle(double x1, double y1, double x2, double y2, double dmax) Fit a circle given coordinates for two points and the impact parameter.
boolean	FitCircle(TrackerHit hit1, TrackerHit hit2, double dmax) Fit a circle given two TrackerHits and the impact parameter.
List<TwoPointCircleFit>	getCircleFits() Get the list of TwoPointCircleFits that are found.
TwoPointLineFit	getLineFit() Get the TwoPointLineFit if the two hits are consistent with a straight-line track that passes within the circle defined by the impact parameter cut.
void	setDebug(boolean debug) Turn on/off the debugging checks.
void	setRMin(double rmin) Set the minimum circle radius.

Methods inherited from class java.lang.Object

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

Field Detail

_rmin

private double _rmin

_circlefits

private List<TwoPointCircleFit> _circlefits

_linefit

private TwoPointLineFit _linefit

_debug

private boolean _debug

_eps

private static double _eps

twopi

private static double twopi

Constructor Detail

TwoPointCircleFitter

public TwoPointCircleFitter(double rmin)

Constructor specifying a minimum radius. If the minimum radius is >0, the algorithm will enforce this constraint even if it means having a smaller impact parameter or fewer / no successful fits.

Parameters:

rmin - minimum circle radius

TwoPointCircleFitter

public TwoPointCircleFitter()

Constructor with no minimum radius.

Method Detail

FitCircle

public boolean FitCircle(TrackerHit hit1,
                TrackerHit hit2,
                double dmax)

Fit a circle given two TrackerHits and the impact parameter.

Parameters:

hit1 - hit #1

hit2 - hit #2

dmax - impact parameter

Returns:

fit status - true if at least one circle fit is found

FitCircle

public boolean FitCircle(double x1,
                double y1,
                double x2,
                double y2,
                double dmax)

Fit a circle given coordinates for two points and the impact parameter.

Parameters:

x1 - x coordinate of first point

y1 - y coordinate of first point

x2 - x coordinate of second point

y2 - y coordinate of second point

dmax - impact parameter

Returns:

fit status - true if at least one circle fit is found

getCircleFits

public List<TwoPointCircleFit> getCircleFits()

Get the list of TwoPointCircleFits that are found.

Returns:

list of circle fits

getLineFit

public TwoPointLineFit getLineFit()

Get the TwoPointLineFit if the two hits are consistent with a straight-line track that passes within the circle defined by the impact parameter cut. If the line connecting the two hits has a larger impact parameter, then a null pointer is returned.

Returns:

pointer to line fit (null if no line fit is found)

setRMin

public void setRMin(double rmin)

Set the minimum circle radius.

Parameters:

rmin - minimum radius

setDebug

public void setDebug(boolean debug)

Turn on/off the debugging checks.

Parameters:

debug - state of debug flag