Gabriele Cosmo
107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4LineSection.cc,v 1.9 2004/12/02 09:55:20 gcosmo Exp $
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// GEANT4 tag $Name: geant4-07-01 $
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//
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// --------------------------------------------------------------------
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#include "G4LineSection.hh"
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G4LineSection::G4LineSection( const G4ThreeVector& PntA,
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const G4ThreeVector& PntB )
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: EndpointA(PntA),
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VecAtoB(PntB-PntA)
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{
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fABdistanceSq = VecAtoB.mag2() ;
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/*
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G4double distABsquared = VecAtoB.mag2() ;
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if ( distABsquared == 0.0)
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{
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G4Exception("G4LineSection::G4LineSection()", "WrongArgumentValue",
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FatalException, "Equal points in input (line->point) ?") ;
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}
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else
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{
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inverse_square_distAB=1.0 / distABsquared ;
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}
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*/
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}
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G4double G4LineSection::Dist( G4ThreeVector OtherPnt ) const
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{
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G4double dist_sq;
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G4ThreeVector VecAZ;
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G4double sq_VecAZ, inner_prod, unit_projection ;
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VecAZ= OtherPnt - EndpointA;
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sq_VecAZ = VecAZ.mag2();
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inner_prod= VecAtoB.dot( VecAZ );
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// Determine Projection(AZ on AB) / Length(AB)
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//
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if( fABdistanceSq != 0.0 )
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{
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// unit_projection= inner_prod * InvsqDistAB();
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unit_projection = inner_prod/fABdistanceSq;
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if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
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{
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dist_sq= sq_VecAZ - unit_projection * inner_prod ;
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}
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else
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{
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// The perpendicular from the point to the line AB meets the line
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// in a point outside the line segment!
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if( unit_projection < 0. ) // A is the closest point
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{
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dist_sq= sq_VecAZ;
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}
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else // B is the closest point
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{
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G4ThreeVector EndpointB = EndpointA + VecAtoB;
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G4ThreeVector VecBZ = OtherPnt - EndpointB;
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dist_sq = VecBZ.mag2();
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}
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}
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}
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else
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{
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dist_sq = (OtherPnt - EndpointA).mag2() ;
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}
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if( dist_sq < 0.0 ) dist_sq = 0.0 ;
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return std::sqrt(dist_sq) ;
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}
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G4double G4LineSection::Distline( const G4ThreeVector& OtherPnt,
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const G4ThreeVector& LinePntA,
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const G4ThreeVector& LinePntB )
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{
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G4LineSection LineAB( LinePntA, LinePntB ); // Line from A to B
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return LineAB.Dist( OtherPnt );
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}
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