Simple helix trajectory. More...

#include <SimpleHelix.h>

Inheritance diagram for SimpleHelix:

Public Member Functions
	SimpleHelix (double d0, double phi0, double omega, double z0, double tanLambda, LCVector3D referencePoint, LCErrorMatrix *errors=0)
	Construct Helix from canonical parameters.

virtual LCVector3D	getPosition (double s, LCErrorMatrix *errors=0) const
	Position at path length s - s==0 corresponds to P.C.A to the origin. More...

virtual LCVector3D	getDirection (double s, LCErrorMatrix *errors=0) const
	Direction at path length s, i.e. More...

virtual LCErrorMatrix	getCovarianceMatrix (double s) const
	Full covariance Matrix of x,y,z,px,py,pz. More...

virtual double	getPathAt (const LCVector3D position) const
	Pathlength at point on trajectory closest to given position. More...

virtual double	getRadius () const
	get the radius of the helix.

virtual double	getIntersectionWithPlane (LCPlane3D p, bool &pointExists) const
	Pathlength at closest intersection point with plane - undefined if pointExists==false.

virtual double	getIntersectionWithCylinder (const LCCylinder &cylinder, bool &pointExists) const
	Pathlength at closest intersection point with cylinder - undefined if pointExists==false. More...

virtual double	getStart () const
	Pathlength at the start and end point of the trajectory.

virtual double	getEnd () const

virtual bool	setStart (double s)
	Set pathlength at the start and end point of the trajectory. More...

virtual bool	setEnd (double s)

virtual bool	setStartEnd (double start, double end)

virtual void	printProperties ()

Protected Member Functions
virtual void	init ()

virtual double	getCentreX () const

virtual double	getCentreY () const

virtual double	getWindingLength () const

virtual double	getPitch ()

Protected Attributes
double	_d0

double	_phi0

double	_omega

double	_z0

double	_tanLambda

double	_helixStart

double	_helixEnd

LCVector3D	_reference

LCErrorMatrix *	_errors

Static Protected Attributes
static const char *	_names []

static const double	_a = 2.99792458E-4

static const double	_pi = M_PI

Detailed Description

Simple helix trajectory.

Author: T.Kraemer, DESY

Version

Id:: SimpleHelix.h,v 1.7 2007-06-20 18:47:25 samson Exp

Member Function Documentation

LCErrorMatrix SimpleHelix::getCovarianceMatrix ( double s ) const

virtual

Full covariance Matrix of x,y,z,px,py,pz.

Parameters

s	path length

Implements Trajectory.

LCVector3D SimpleHelix::getDirection	(	double	s,
		LCErrorMatrix *	errors = `0`
	)		const

virtual

Direction at path length s, i.e.

(dx/ds,dy/ds,dz/ds)

Parameters

s	path length
errors	return argument - not computed if NULL

Implements Trajectory.

double SimpleHelix::getIntersectionWithCylinder	(	const LCCylinder &	cylinder,
		bool &	pointExists
	)		const

virtual

Pathlength at closest intersection point with cylinder - undefined if pointExists==false.

Parameters

cylinder cylinder object to intersect with

Implements Trajectory.

References LCCylinder::distance(), LCLine3D::distance(), LCCylinder::endPoint(), getPosition(), getRadius(), LCCylinder::length(), LCLine3D::position(), LCLine3D::projectPoint(), LCCylinder::radius(), and LCCylinder::startPoint().

double SimpleHelix::getPathAt ( const LCVector3D position ) const

virtual

Pathlength at point on trajectory closest to given position.

In order to get the distance use for example:
LCVector3D pt = t.getPosition( t.getPathAtClosestPoint( p ) ) ;
double d = LCVector3D( pt - p ).mag() ;

int nSteps = 100;

Implements Trajectory.

References getPosition().

LCVector3D SimpleHelix::getPosition	(	double	s,
		LCErrorMatrix *	errors = `0`
	)		const

virtual

Position at path length s - s==0 corresponds to P.C.A to the origin.

Parameters

s	path length
errors	return argument - not computed if NULL

Implements Trajectory.

Referenced by getIntersectionWithCylinder(), getIntersectionWithPlane(), and getPathAt().

bool SimpleHelix::setStart ( double s )

virtual

Set pathlength at the start and end point of the trajectory.

Parameters

start	pathlength of start point
end	pathlength of end point

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

SimpleHelix.h
SimpleHelix.cc

Public Member Functions

Protected Member Functions

Protected Attributes

Static Protected Attributes

Detailed Description

Member Function Documentation

int nSteps = 100;