gbl::GblSimpleHelix Class Reference

Simple helix. More...

#include <GblUtilities.h>

Public Member Functions
	GblSimpleHelix (double aRinv, double aPhi0, double aDca, double aDzds, double aZ0)
	Create simple helix. More...
virtual	~GblSimpleHelix ()
double	getPhi (double aRadius) const
	Get phi (of point on circle) for given radius (to ref. point) More...
double	getArcLengthR (double aRadius) const
	Get (2D) arc length for given radius (to ref. point) More...
double	getArcLengthXY (double xPos, double yPos) const
	Get (2D) arc length for given point. More...
void	moveToXY (double xPos, double yPos, double &newPhi0, double &newDca, double &newZ0) const
	Move to new reference point (X,Y) More...
GblHelixPrediction	getPrediction (const Eigen::Vector3d &refPos, const Eigen::Vector3d &uDir, const Eigen::Vector3d &vDir) const
	Get prediction. More...

Private Attributes
const double	rinv
	curvature (1/Radius) More...
const double	phi0
	azimuth at PCA (point of closest approach to origin in XY plane, defines arc-length S=0) More...
const double	dca
	distance to origin in XY plane at PCA More...
const double	dzds
	slope in ZS plane (dZ/dS) More...
const double	z0
	offset in ZS plane More...
const double	cosPhi0
	cos(phi0) More...
const double	sinPhi0
	sin(phi0) More...
const double	xRelCenter
	X position of circle center / R. More...
const double	yRelCenter
	Y position of circle center / R. More...

Detailed Description

Simple helix.

Circle in XY plane, straight line in ZS.

Definition at line 78 of file GblUtilities.h.

Constructor & Destructor Documentation

GblSimpleHelix()

gbl::GblSimpleHelix::GblSimpleHelix	(	double	aRinv,
		double	aPhi0,
		double	aDca,
		double	aDzds,
		double	aZ0
	)

Create simple helix.

Helix for constant magnetic field in Z direction.

Parameters

[in]	aRinv	curvature (1/R)
[in]	aPhi0	azimuth at PCA
[in]	aDca	XY distance at PCA
[in]	aDzds	slope in ZS (tanLambda)
[in]	aZ0	offset in ZS

Definition at line 170 of file GblUtilities.cpp.

~GblSimpleHelix()

gbl::GblSimpleHelix::~GblSimpleHelix ( )

virtual

Definition at line 178 of file GblUtilities.cpp.

Member Function Documentation

getArcLengthR()

double gbl::GblSimpleHelix::getArcLengthR

(

double

aRadius

)

const

Get (2D) arc length for given radius (to ref. point)

( |dca| < radius < |rad-2*dca|, from H1/cjfsxy )

Parameters

[in]

aRadius

radius

Definition at line 199 of file GblUtilities.cpp.

References dca, and rinv.

Referenced by exampleComposedGeo(), exampleComposedKin(), and GblSimpleHelix_getArcLengthR().

getArcLengthXY()

double gbl::GblSimpleHelix::getArcLengthXY	(	double	xPos,
		double	yPos
	)		const

Get (2D) arc length for given point.

Parameters

[in]	xPos	X Position
[in]	yPos	Y Position

Definition at line 223 of file GblUtilities.cpp.

References cosPhi0, phi0, rinv, sinPhi0, xRelCenter, and yRelCenter.

Referenced by exampleComposedGeo(), exampleComposedKin(), GblSimpleHelix_getArcLengthXY(), and getPrediction().

getPhi()

double gbl::GblSimpleHelix::getPhi

(

double

aRadius

)

const

Get phi (of point on circle) for given radius (to ref. point)

( |dca| < radius < |rad-2*dca|, from H1/cjfphi, not restricted to -Pi .. +Pi )

Parameters

[in]

aRadius

radius

Definition at line 187 of file GblUtilities.cpp.

References dca, phi0, and rinv.

Referenced by exampleComposedGeo(), exampleComposedKin(), and GblSimpleHelix_getPhi().

getPrediction()

GblHelixPrediction gbl::GblSimpleHelix::getPrediction	(	const Eigen::Vector3d &	refPos,
		const Eigen::Vector3d &	uDir,
		const Eigen::Vector3d &	vDir
	)		const

Get prediction.

Definition at line 284 of file GblUtilities.cpp.

References cosPhi0, dca, dzds, getArcLengthXY(), phi0, rinv, sinPhi0, xRelCenter, yRelCenter, and z0.

Referenced by GblDetectorLayer_intersectWithHelix(), GblSimpleHelix_getPrediction(), and gbl::GblDetectorLayer::intersectWithHelix().

moveToXY()

void gbl::GblSimpleHelix::moveToXY	(	double	xPos,
		double	yPos,
		double &	newPhi0,
		double &	newDca,
		double &	newZ0
	)		const

Move to new reference point (X,Y)

Parameters

[in]	xPos	X Position
[in]	yPos	Y Position
[out]	newPhi0	new phi0
[out]	newDca	new dca
[out]	newZ0	new z0

Definition at line 246 of file GblUtilities.cpp.

References cosPhi0, dca, dzds, phi0, rinv, sinPhi0, and z0.

Referenced by exampleDc(), exampleSit(), and GblSimpleHelix_moveToXY().

Member Data Documentation

cosPhi0

const double gbl::GblSimpleHelix::cosPhi0

private

cos(phi0)

Definition at line 97 of file GblUtilities.h.

Referenced by getArcLengthXY(), getPrediction(), and moveToXY().

dca

const double gbl::GblSimpleHelix::dca

private

distance to origin in XY plane at PCA

Definition at line 94 of file GblUtilities.h.

Referenced by getArcLengthR(), getPhi(), getPrediction(), and moveToXY().

dzds

const double gbl::GblSimpleHelix::dzds

private

slope in ZS plane (dZ/dS)

Definition at line 95 of file GblUtilities.h.

Referenced by getPrediction(), and moveToXY().

phi0

const double gbl::GblSimpleHelix::phi0

private

azimuth at PCA (point of closest approach to origin in XY plane, defines arc-length S=0)

Definition at line 93 of file GblUtilities.h.

Referenced by getArcLengthXY(), getPhi(), getPrediction(), and moveToXY().

rinv

const double gbl::GblSimpleHelix::rinv

private

curvature (1/Radius)

Definition at line 92 of file GblUtilities.h.

Referenced by getArcLengthR(), getArcLengthXY(), getPhi(), getPrediction(), and moveToXY().

sinPhi0

const double gbl::GblSimpleHelix::sinPhi0

private

sin(phi0)

Definition at line 98 of file GblUtilities.h.

Referenced by getArcLengthXY(), getPrediction(), and moveToXY().

xRelCenter

const double gbl::GblSimpleHelix::xRelCenter

private

X position of circle center / R.

Definition at line 99 of file GblUtilities.h.

Referenced by getArcLengthXY(), and getPrediction().

yRelCenter

const double gbl::GblSimpleHelix::yRelCenter

private

Y position of circle center / R.

Definition at line 100 of file GblUtilities.h.

Referenced by getArcLengthXY(), and getPrediction().

z0

const double gbl::GblSimpleHelix::z0

private

offset in ZS plane

Definition at line 96 of file GblUtilities.h.

Referenced by getPrediction(), and moveToXY().

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The documentation for this class was generated from the following files:

• src/GblUtilities.h
• src/GblUtilities.cpp