Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/src/G4LineSection.cc

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  2 // ********************************************************************
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 24 // ********************************************************************
 25 //
 26 // G4LineSection implementation
 27 //
 28 // Created: J.Apostolakis, 1999
 29 // --------------------------------------------------------------------
 30 
 31 #include "G4LineSection.hh" 
 32 
 33 G4LineSection::G4LineSection( const G4ThreeVector& PntA, 
 34                               const G4ThreeVector& PntB )
 35   : EndpointA(PntA), VecAtoB(PntB-PntA)
 36 { 
 37   fABdistanceSq = VecAtoB.mag2();  
 38 }
 39 
 40 G4double G4LineSection::Dist( const G4ThreeVector& OtherPnt ) const
 41 {
 42   G4double       dist_sq;  
 43   G4ThreeVector  VecAZ;
 44   G4double sq_VecAZ, inner_prod, unit_projection ; 
 45 
 46   VecAZ= OtherPnt - EndpointA;
 47   sq_VecAZ = VecAZ.mag2();
 48 
 49   inner_prod= VecAtoB.dot( VecAZ );
 50    
 51   //  Determine  Projection(AZ on AB) / Length(AB) 
 52   //
 53   if( fABdistanceSq != 0.0 )
 54   {
 55     //  unit_projection= inner_prod * InvsqDistAB();
 56     unit_projection = inner_prod/fABdistanceSq;
 57 
 58     if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
 59     {
 60       dist_sq= sq_VecAZ -  unit_projection * inner_prod ;
 61     }
 62     else
 63     {
 64      //  The perpendicular from the point to the line AB meets the line
 65      //   in a point outside the line segment!
 66      
 67       if( unit_projection < 0. ) // A is the closest point
 68       {
 69         dist_sq= sq_VecAZ;  
 70       }
 71       else                       // B is the closest point
 72       {
 73         G4ThreeVector   EndpointB = EndpointA + VecAtoB;
 74         G4ThreeVector   VecBZ =     OtherPnt - EndpointB;
 75         dist_sq =  VecBZ.mag2();
 76       }
 77     }
 78   }
 79   else
 80   {
 81      dist_sq = (OtherPnt - EndpointA).mag2() ;   
 82   }  
 83   if( dist_sq < 0.0 )
 84   {
 85     dist_sq = 0.0 ;
 86   }
 87 
 88   return std::sqrt(dist_sq) ;  
 89 }
 90