G4LineSection Class Reference

#include <G4LineSection.hh>

Public Member Functions
G4double	Dist (G4ThreeVector OtherPnt) const
	G4LineSection (const G4ThreeVector &PntA, const G4ThreeVector &PntB)
G4double	GetABdistanceSq () const

Static Public Member Functions
static G4double	Distline (const G4ThreeVector &OtherPnt, const G4ThreeVector &LinePntA, const G4ThreeVector &LinePntB)

Private Attributes
G4ThreeVector	EndpointA
G4double	fABdistanceSq = 0.0
G4ThreeVector	VecAtoB

Detailed Description

Definition at line 42 of file G4LineSection.hh.

Constructor & Destructor Documentation

G4LineSection()

G4LineSection::G4LineSection	(	const G4ThreeVector &	PntA,
		const G4ThreeVector &	PntB
	)

Definition at line 33 of file G4LineSection.cc.

  : EndpointA(PntA), VecAtoB(PntB-PntA)
{ 
  fABdistanceSq = VecAtoB.mag2();  
}

References fABdistanceSq, CLHEP::Hep3Vector::mag2(), and VecAtoB.

Member Function Documentation

Dist()

G4double G4LineSection::Dist

(

G4ThreeVector

OtherPnt

)

const

Definition at line 40 of file G4LineSection.cc.

{
  G4double       dist_sq;  
  G4ThreeVector  VecAZ;
  G4double sq_VecAZ, inner_prod, unit_projection ; 
 
  VecAZ= OtherPnt - EndpointA;
  sq_VecAZ = VecAZ.mag2();
 
  inner_prod= VecAtoB.dot( VecAZ );
   
  //  Determine  Projection(AZ on AB) / Length(AB) 
  //
  if( fABdistanceSq != 0.0 )
  {
    //  unit_projection= inner_prod * InvsqDistAB();
    unit_projection = inner_prod/fABdistanceSq;
 
    if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
    {
      dist_sq= sq_VecAZ -  unit_projection * inner_prod ;
    }
    else
    {
     //  The perpendicular from the point to the line AB meets the line
     //   in a point outside the line segment!
     
      if( unit_projection < 0. ) // A is the closest point
      {
        dist_sq= sq_VecAZ;  
      }
      else                       // B is the closest point
      {
        G4ThreeVector   EndpointB = EndpointA + VecAtoB;
        G4ThreeVector   VecBZ =     OtherPnt - EndpointB;
        dist_sq =  VecBZ.mag2();
      }
    }
  }
  else
  {
     dist_sq = (OtherPnt - EndpointA).mag2() ;   
  }  
  if( dist_sq < 0.0 ) dist_sq = 0.0 ;
 
  return std::sqrt(dist_sq) ;  
}

References CLHEP::Hep3Vector::dot(), EndpointA, fABdistanceSq, CLHEP::Hep3Vector::mag2(), and VecAtoB.

Referenced by Distline().

Distline()

G4double G4LineSection::Distline ( const G4ThreeVector &  OtherPnt, const G4ThreeVector &  LinePntA, const G4ThreeVector &  LinePntB  )

inlinestatic

Definition at line 72 of file G4LineSection.hh.

{
  G4LineSection LineAB( LinePntA, LinePntB );  // Line from A to B
  return LineAB.Dist( OtherPnt );
}

References Dist().

Referenced by G4BogackiShampine45::DistChord(), G4CashKarpRKF45::DistChord(), G4ConstRK4::DistChord(), G4DoLoMcPriRK34::DistChord(), G4DormandPrinceRK56::DistChord(), G4DormandPrinceRK78::DistChord(), G4FSALBogackiShampine45::DistChord(), G4FSALDormandPrince745::DistChord(), G4MagErrorStepper::DistChord(), G4RKG3_Stepper::DistChord(), G4TsitourasRK45::DistChord(), G4BogackiShampine23::DistChord(), G4DormandPrince745::DistChord(), G4NystromRK4::DistChord(), G4RK547FEq1::DistChord(), G4RK547FEq2::DistChord(), G4RK547FEq3::DistChord(), G4TCashKarpRKF45< T_Equation, N >::DistChord(), G4TDormandPrince45< T_Equation, N >::DistChord(), and G4TMagErrorStepper< T_Stepper, T_Equation, N >::DistChord().

GetABdistanceSq()

G4double G4LineSection::GetABdistanceSq ( ) const

inline

Definition at line 66 of file G4LineSection.hh.

{
  return fABdistanceSq;
}

References fABdistanceSq.

Field Documentation

EndpointA

G4ThreeVector G4LineSection::EndpointA

private

Definition at line 58 of file G4LineSection.hh.

Referenced by Dist().

fABdistanceSq

G4double G4LineSection::fABdistanceSq = 0.0

private

Definition at line 60 of file G4LineSection.hh.

Referenced by Dist(), G4LineSection(), and GetABdistanceSq().

VecAtoB

G4ThreeVector G4LineSection::VecAtoB

private

Definition at line 59 of file G4LineSection.hh.

Referenced by Dist(), and G4LineSection().

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The documentation for this class was generated from the following files:

• source/geometry/magneticfield/include/G4LineSection.hh
• source/geometry/magneticfield/src/G4LineSection.cc