#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 (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.
	TangentHelix (const GlobalPoint &outerPoint, const GlobalPoint &innerPoint, const GlobalPoint &vertexPoint)
	Calculate Helix from 3 points.
	TangentHelix (const GlobalVector &direction, const GlobalPoint &innerPoint, const GlobalPoint &outerPoint)
	TangentHelix ()
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 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;
}