#include <FastLine.h>

Public Member Functions
double	c () const
	FastLine (const GlobalPoint &outerHit, const GlobalPoint &innerHit, double rho)
	FastLine (const GlobalPoint &outerHit, const GlobalPoint &innerHit)
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.

{}

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().

{return theC;}

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());

}