TangentHelix Class Reference

#include <TangentHelix.h>

Public Member Functions
int	charge (float magz)
TangentCircle	circle () const
double	curvatureError ()
GlobalVector	directionAtVertex ()
GlobalPoint	innerPoint () const
GlobalPoint	outerPoint () const
double	rho () const
	TangentHelix ()
	TangentHelix (const GlobalVector &direction, const GlobalPoint &innerPoint, const GlobalPoint &outerPoint)
	TangentHelix (const GlobalPoint &outerPoint, const GlobalPoint &innerPoint, const GlobalPoint &vertexPoint)
	Calculate Helix from 3 points. More...
	TangentHelix (const TangentHelix &primCircle, const GlobalPoint &outerPoint, const GlobalPoint &innerPoint)
	Calculate the parameters of the helix which pass by 2 points (innerPoint and outerPoint) and which is tangent to primHelix. More...
double	vertexError ()
GlobalPoint	vertexPoint () const

Private Attributes
TangentCircle	theCircle
GlobalVector	theDirectionAtVertex
GlobalPoint	theInnerPoint
GlobalPoint	theOuterPoint
GlobalPoint	theVertexPoint

Detailed Description

Definition at line 6 of file TangentHelix.h.

Constructor & Destructor Documentation

TangentHelix::TangentHelix ( )

inline

Definition at line 9 of file TangentHelix.h.

{}

TangentHelix::TangentHelix ( const GlobalVector &  direction, const GlobalPoint &  innerPoint, const GlobalPoint &  outerPoint  )

inline

Calculate the helix from 2 points on the circle (the vertex=innerPoint and the outerPoint) and the tangent direction at the inner point

Definition at line 13 of file TangentHelix.h.

                                                                                                                 : 
            theInnerPoint(innerPoint), theOuterPoint(outerPoint), theVertexPoint(innerPoint), theCircle(direction, innerPoint, outerPoint), 
            theDirectionAtVertex(direction) {}

TangentHelix::TangentHelix ( const GlobalPoint &  outerPoint, const GlobalPoint &  innerPoint, const GlobalPoint &  vertexPoint  )

inline

Calculate Helix from 3 points.

Definition at line 18 of file TangentHelix.h.

References theDirectionAtVertex.

                                                                                                                  : 
           theInnerPoint(innerPoint), theOuterPoint(outerPoint), theVertexPoint(vertexPoint), theCircle(outerPoint, innerPoint, vertexPoint) {
           theDirectionAtVertex = GlobalVector(1000,1000,1000);
       }

TangentHelix::TangentHelix	(	const TangentHelix &	primCircle,
		const GlobalPoint &	outerPoint,
		const GlobalPoint &	innerPoint
	)

Calculate the parameters of the helix which pass by 2 points (innerPoint and outerPoint) and which is tangent to primHelix.

Definition at line 3 of file TangentHelix.cc.

References ztail::d, mag(), theCircle, theDirectionAtVertex, theVertexPoint, TangentCircle::vertexPoint(), PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

                                                                                                                       :
     theInnerPoint(innerPoint), theOuterPoint(outerPoint), theCircle(primCircle.circle(), outerPoint, innerPoint) {

   // Calculation of vertex.z :
   GlobalPoint inner_T( innerPoint.x() , innerPoint.y() , 0.0 );
   GlobalPoint outer_T( outerPoint.x() , outerPoint.y() , 0.0 );
   GlobalPoint vtx_T( theCircle.vertexPoint().x() , theCircle.vertexPoint().y() , 0.0 );

   double d1 = (inner_T - vtx_T).mag();
   double d = (inner_T - outer_T).mag();

   theVertexPoint = GlobalPoint(vtx_T.x() , vtx_T.y(), innerPoint.z() - (outerPoint.z() - innerPoint.z()) * d1 / d );
   theDirectionAtVertex = GlobalVector(1000, 1000, 1000);
}

Member Function Documentation

int TangentHelix::charge ( float  magz )

inline

Definition at line 36 of file TangentHelix.h.

References TangentCircle::charge(), and theCircle.

Referenced by SeedFromNuclearInteraction::stateWithError().

{ return theCircle.charge(magz); }

TangentCircle TangentHelix::circle ( ) const

inline

Definition at line 32 of file TangentHelix.h.

References theCircle.

{ return theCircle; }

double TangentHelix::curvatureError ( )

inline

Definition at line 40 of file TangentHelix.h.

References TangentCircle::curvatureError(), and theCircle.

{ return theCircle.curvatureError(); }

GlobalVector TangentHelix::directionAtVertex

(

)

Definition at line 18 of file TangentHelix.cc.

References dir, TangentCircle::directionAtVertex(), PV3DBase< T, PVType, FrameType >::mag(), theCircle, theDirectionAtVertex, theInnerPoint, theOuterPoint, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by SeedFromNuclearInteraction::stateWithError().

                                             {

   if(theDirectionAtVertex.z() > 999) {
      GlobalPoint inner_T( theInnerPoint.x() , theInnerPoint.y() , 0.0 );
      GlobalPoint outer_T( theOuterPoint.x() , theOuterPoint.y() , 0.0 );
      double p_z = (theOuterPoint.z() - theInnerPoint.z()) / (outer_T - inner_T).mag();

      GlobalVector dir_T = theCircle.directionAtVertex();
      GlobalVector dir( dir_T.x(), dir_T.y(), p_z);

      dir/=dir.mag();
      theDirectionAtVertex = dir;
    }

   return theDirectionAtVertex;
}

GlobalPoint TangentHelix::innerPoint ( ) const

inline

Definition at line 28 of file TangentHelix.h.

References theInnerPoint.

{ return theInnerPoint; }

GlobalPoint TangentHelix::outerPoint ( ) const

inline

Definition at line 26 of file TangentHelix.h.

References theOuterPoint.

{ return theOuterPoint; }

double TangentHelix::rho ( ) const

inline

Definition at line 38 of file TangentHelix.h.

References TangentCircle::rho(), and theCircle.

Referenced by Lepton.Lepton::absIsoFromEA(), Muon.Muon::absIsoWithFSR(), and SeedFromNuclearInteraction::stateWithError().

{ return theCircle.rho(); }

double TangentHelix::vertexError ( )

inline

Definition at line 42 of file TangentHelix.h.

References theCircle, and TangentCircle::vertexError().

Referenced by SeedFromNuclearInteraction::stateWithError().

{ return theCircle.vertexError(); }

GlobalPoint TangentHelix::vertexPoint ( ) const

inline

Definition at line 30 of file TangentHelix.h.

References theVertexPoint.

Referenced by SeedFromNuclearInteraction::stateWithError().

{ return theVertexPoint; }

Member Data Documentation

TangentCircle TangentHelix::theCircle

private

Definition at line 49 of file TangentHelix.h.

Referenced by charge(), circle(), curvatureError(), directionAtVertex(), rho(), TangentHelix(), and vertexError().

GlobalVector TangentHelix::theDirectionAtVertex

private

Definition at line 51 of file TangentHelix.h.

Referenced by directionAtVertex(), and TangentHelix().

GlobalPoint TangentHelix::theInnerPoint

private

Definition at line 45 of file TangentHelix.h.

Referenced by directionAtVertex(), and innerPoint().

GlobalPoint TangentHelix::theOuterPoint

private

Definition at line 46 of file TangentHelix.h.

Referenced by directionAtVertex(), and outerPoint().

GlobalPoint TangentHelix::theVertexPoint

private

Definition at line 47 of file TangentHelix.h.

Referenced by TangentHelix(), and vertexPoint().