HelixBarrelPlaneCrossing2OrderLocal Class Reference

#include <HelixBarrelPlaneCrossing2OrderLocal.h>

Public Types
typedef Surface::GlobalPoint	GlobalPoint
typedef Surface::GlobalVector	GlobalVector
typedef Surface::LocalPoint	LocalPoint
typedef Surface::LocalVector	LocalVector

Public Member Functions
LocalVector	direction () const
	HelixBarrelPlaneCrossing2OrderLocal (const GlobalPoint &startingPos, const GlobalVector &startingDir, float rho, const Plane &plane)
LocalPoint	position () const

Static Public Member Functions
static LocalPoint	positionOnly (const GlobalPoint &startingPos, const GlobalVector &startingDir, float rho, const Plane &plane)

Private Attributes
LocalVector	theDir
LocalPoint	thePos

Detailed Description

Calculates an approximate crossing of a helix and a barrel plane. The helix circle is approximated with a parabola. The current class name is misleading, since it does not have the HelixPlaneCrossing interface.

Definition at line 12 of file HelixBarrelPlaneCrossing2OrderLocal.h.

Member Typedef Documentation

GlobalPoint

typedef Surface::GlobalPoint HelixBarrelPlaneCrossing2OrderLocal::GlobalPoint

Definition at line 14 of file HelixBarrelPlaneCrossing2OrderLocal.h.

GlobalVector

typedef Surface::GlobalVector HelixBarrelPlaneCrossing2OrderLocal::GlobalVector

Definition at line 15 of file HelixBarrelPlaneCrossing2OrderLocal.h.

LocalPoint

typedef Surface::LocalPoint HelixBarrelPlaneCrossing2OrderLocal::LocalPoint

Definition at line 16 of file HelixBarrelPlaneCrossing2OrderLocal.h.

LocalVector

typedef Surface::LocalVector HelixBarrelPlaneCrossing2OrderLocal::LocalVector

Definition at line 17 of file HelixBarrelPlaneCrossing2OrderLocal.h.

Constructor & Destructor Documentation

HelixBarrelPlaneCrossing2OrderLocal()

HelixBarrelPlaneCrossing2OrderLocal::HelixBarrelPlaneCrossing2OrderLocal	(	const GlobalPoint &	startingPos,
		const GlobalVector &	startingDir,
		float	rho,
		const Plane &	plane
	)

Definition at line 5 of file HelixBarrelPlaneCrossing2OrderLocal.cc.

                                                                                             {
  typedef Basic2DVector<float> Vector2D;
 
  // translate problem to local frame of the plane
  Plane::ToLocal toLocal(plane);
  LocalPoint lPos = toLocal.toLocal(startingPos);
  LocalVector lDir = toLocal.toLocal(startingDir);
 
  // check if local frame is already special (local Y axis == global Z axis)
  LocalVector yPrime = toLocal.toLocal(GlobalVector(0, 0, 1.f));
  // LocalVector diff = yPrime - LocalVector(0,-1.f,0);
  float sinPhi = 0, cosPhi = 0;
  bool rotated;
  Vector2D pos;
  Vector2D dir;
 
  if (std::abs(yPrime.y()) > 0.9999f) {
    // cout << "Plane already oriented, yPrime = " << yPrime << endl;
 
    // we are already in the special orientation
    pos = Vector2D(lPos.x(), lPos.y());
    dir = Vector2D(lDir.x(), lDir.y());
    ;
    rotated = false;
  } else {
    // cout << "Plane needs rotation, yPrime = " << yPrime << endl;
 
    // we need to rotate the problem
    sinPhi = yPrime.y();
    cosPhi = yPrime.x();
    pos = Vector2D(lPos.x() * cosPhi + lPos.y() * sinPhi, -lPos.x() * sinPhi + lPos.y() * cosPhi);
    dir = Vector2D(lDir.x() * cosPhi + lDir.y() * sinPhi, -lDir.x() * sinPhi + lDir.y() * cosPhi);
    rotated = true;
  }
 
  float d = -lPos.z();
  float x = pos.x() + dir.x() / lDir.z() * d - 0.5f * rho * d * d;
  float y = pos.y() + dir.y() / lDir.z() * d;
 
  //    cout << "d= " << d << ", pos.x()= " << pos.x()
  //         << ", dir.x()/lDir.z()= " << dir.x()/lDir.z()
  //         << ", 0.5*rho*d*d= " << 0.5*rho*d*d << endl;
 
  if (!rotated) {
    thePos = LocalPoint(x, y, 0);
    theDir = LocalVector(dir.x() + rho * d, dir.y(), lDir.z());
  } else {
    thePos = LocalPoint(x * cosPhi - y * sinPhi, x * sinPhi + y * cosPhi, 0);
    float px = dir.x() + rho * d;
    theDir = LocalVector(px * cosPhi - dir.y() * sinPhi, px * sinPhi + dir.y() * cosPhi, lDir.z());
  }
}

References funct::abs(), Phase1L1TJetProducer_cfi::cosPhi, ztail::d, DeadROC_duringRun::dir, f, multPhiCorr_741_25nsDY_cfi::px, rho, Phase1L1TJetProducer_cfi::sinPhi, theDir, thePos, toLocal(), x, PV3DBase< T, PVType, FrameType >::x(), y, PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Member Function Documentation

direction()

LocalVector HelixBarrelPlaneCrossing2OrderLocal::direction ( ) const

inline

Definition at line 25 of file HelixBarrelPlaneCrossing2OrderLocal.h.

{ return theDir; }

References theDir.

position()

LocalPoint HelixBarrelPlaneCrossing2OrderLocal::position ( ) const

inline

Definition at line 24 of file HelixBarrelPlaneCrossing2OrderLocal.h.

{ return thePos; }

References thePos.

positionOnly()

LocalPoint HelixBarrelPlaneCrossing2OrderLocal::positionOnly ( const GlobalPoint &  startingPos, const GlobalVector &  startingDir, float  rho, const Plane &  plane  )

static

Definition at line 61 of file HelixBarrelPlaneCrossing2OrderLocal.cc.

                                                                                 {
  typedef Basic2DVector<float> Vector2D;
 
  // translate problem to local frame of the plane
  Plane::ToLocal toLocal(plane);
  LocalPoint lPos = toLocal.toLocal(startingPos);
  LocalVector lDir = toLocal.toLocal(startingDir);
 
  // check if local frame is already special (local Y axis == global Z axis)
  LocalVector yPrime = toLocal.toLocal(GlobalVector(0, 0, 1.f));
  // LocalVector diff = yPrime - LocalVector(0,-1.f,0);
  float sinPhi = 0, cosPhi = 0;
  bool rotated;
  Vector2D pos;
  Vector2D dir;
 
  if (std::abs(yPrime.y()) > 0.9999f) {
    // cout << "Plane already oriented, yPrime = " << yPrime << endl;
 
    // we are already in the special orientation
    pos = Vector2D(lPos.x(), lPos.y());
    dir = Vector2D(lDir.x(), lDir.y());
    ;
    rotated = false;
  } else {
    // cout << "Plane needs rotation, yPrime = " << yPrime << endl;
 
    // we need to rotate the problem
    sinPhi = yPrime.y();
    cosPhi = yPrime.x();
    pos = Vector2D(lPos.x() * cosPhi + lPos.y() * sinPhi, -lPos.x() * sinPhi + lPos.y() * cosPhi);
    dir = Vector2D(lDir.x() * cosPhi + lDir.y() * sinPhi, -lDir.x() * sinPhi + lDir.y() * cosPhi);
    rotated = true;
  }
 
  float d = -lPos.z();
  float x = pos.x() + dir.x() / lDir.z() * d - 0.5f * rho * d * d;
  float y = pos.y() + dir.y() / lDir.z() * d;
 
  //    cout << "d= " << d << ", pos.x()= " << pos.x()
  //         << ", dir.x()/lDir.z()= " << dir.x()/lDir.z()
  //         << ", 0.5*rho*d*d= " << 0.5*rho*d*d << endl;
 
  return (!rotated) ? LocalPoint(x, y, 0) : LocalPoint(x * cosPhi - y * sinPhi, x * sinPhi + y * cosPhi, 0);
}

References funct::abs(), Phase1L1TJetProducer_cfi::cosPhi, ztail::d, DeadROC_duringRun::dir, f, rho, Phase1L1TJetProducer_cfi::sinPhi, toLocal(), x, PV3DBase< T, PVType, FrameType >::x(), y, PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Member Data Documentation

theDir

LocalVector HelixBarrelPlaneCrossing2OrderLocal::theDir

private

Definition at line 34 of file HelixBarrelPlaneCrossing2OrderLocal.h.

Referenced by direction(), and HelixBarrelPlaneCrossing2OrderLocal().

thePos

LocalPoint HelixBarrelPlaneCrossing2OrderLocal::thePos

private

Definition at line 33 of file HelixBarrelPlaneCrossing2OrderLocal.h.

Referenced by HelixBarrelPlaneCrossing2OrderLocal(), and position().