#include <FastLine.h>

Public Member Functions
double	c () const

	FastLine (const GlobalPoint &outerHit, const GlobalPoint &innerHit)

	FastLine (const GlobalPoint &outerHit, const GlobalPoint &innerHit, double rho)

bool	isValid () const

double	n1 () const

double	n2 () const

	~FastLine ()

Private Member Functions
void	createLineParameters ()

Private Attributes
double	theC

GlobalPoint	theInnerHit

double	theN1

double	theN2

GlobalPoint	theOuterHit

double	theRho

bool	theValid

Detailed Description

Calculate the Line parameters (n1, n2, c) of a Line in Rho*Phi-Z. A Line is defined by n1*x + n2*y + c = 0. (== n1*RHOPHI + n2*Z + c) If rho is not specified, the Line parameters are calculated in R-Z.

Implementation: Matthias Winkler 21.02.2001

Definition at line 15 of file FastLine.h.

Constructor & Destructor Documentation

FastLine::FastLine	(	const GlobalPoint &	outerHit,
		const GlobalPoint &	innerHit
	)

Definition at line 3 of file FastLine.cc.

References createLineParameters().

                                         : 
   theOuterHit(outerHit),
   theInnerHit(innerHit),
   theRho(0.),
   theN1(0.),
   theN2(0.),
   theC(0.),
   theValid(true) {
 
   createLineParameters();
   
 }

FastLine::FastLine	(	const GlobalPoint &	outerHit,
		const GlobalPoint &	innerHit,
		double	rho
	)

Definition at line 17 of file FastLine.cc.

References createLineParameters().

                        : 
   theOuterHit(outerHit),
   theInnerHit(innerHit),
   theRho(rho),
   theN1(0.),
   theN2(0.),
   theC(0.),
   theValid(true) {
 
   createLineParameters();
   
 }

FastLine::~FastLine ( )

inline

Definition at line 26 of file FastLine.h.

26 {}

Member Function Documentation

double FastLine::c ( ) const

inline

Definition at line 32 of file FastLine.h.

References theC.

Referenced by ConversionFastHelix::helixStateAtVertex(), ConversionFastHelix::straightLineStateAtVertex(), and FastHelix::straightLineStateAtVertex().

32 {return theC;}

FastLine::theC

double theC

Definition: FastLine.h:44

void FastLine::createLineParameters ( )

private

Definition at line 32 of file FastLine.cc.

References n1(), n2(), PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::perp2(), mathSSE::sqrt(), theC, theInnerHit, theN1, theN2, theOuterHit, theRho, and PV3DBase< T, PVType, FrameType >::z().

Referenced by FastLine().

                                     {
 
   double rphi0 = 0., rphi1 = 0.;
 
   if(theRho > 0.) {
     if (fabs( 1. - theInnerHit.perp2()/(2.*theRho*theRho) ) > 1.) rphi0 = theInnerHit.perp();
     else rphi0 = theRho*acos(1. - theInnerHit.perp2()/(2.*theRho*theRho));
     if (fabs(1. - theOuterHit.perp2()/(2.*theRho*theRho) ) >1.) rphi1 = theOuterHit.perp();
     else rphi1 = theRho*acos(1. - theOuterHit.perp2()/(2.*theRho*theRho));
   } else {
     rphi0 = theInnerHit.perp();
     rphi1 = theOuterHit.perp();
   } 
 
   double n1 = theInnerHit.z() - theOuterHit.z();
   double n2 = -(rphi0 - rphi1);
   double norm = sqrt(n1*n1 + n2*n2);
   theN1 = n1/norm;
   theN2= n2/norm;
   theC = -(theN1*rphi0 + theN2*theInnerHit.z());
   //  theC = -(theN1*rphi1 + theN2*theOuterHit.z());
 
 }