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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4LineSection implementation <<
27 // 26 //
28 // Created: J.Apostolakis, 1999 << 27 // $Id: G4LineSection.cc 85845 2014-11-05 15:43:58Z gcosmo $
>> 28 //
29 // ------------------------------------------- 29 // --------------------------------------------------------------------
30 30
31 #include "G4LineSection.hh" 31 #include "G4LineSection.hh"
32 32
33 G4LineSection::G4LineSection( const G4ThreeVec << 33 G4double G4LineSection::Dist( G4ThreeVector OtherPnt ) const
34 const G4ThreeVec <<
35 : EndpointA(PntA), VecAtoB(PntB-PntA) <<
36 { <<
37 fABdistanceSq = VecAtoB.mag2(); <<
38 } <<
39 <<
40 G4double G4LineSection::Dist( const G4ThreeVec <<
41 { 34 {
42 G4double dist_sq; 35 G4double dist_sq;
43 G4ThreeVector VecAZ; 36 G4ThreeVector VecAZ;
44 G4double sq_VecAZ, inner_prod, unit_projecti 37 G4double sq_VecAZ, inner_prod, unit_projection ;
45 38
46 VecAZ= OtherPnt - EndpointA; 39 VecAZ= OtherPnt - EndpointA;
47 sq_VecAZ = VecAZ.mag2(); 40 sq_VecAZ = VecAZ.mag2();
48 41
49 inner_prod= VecAtoB.dot( VecAZ ); 42 inner_prod= VecAtoB.dot( VecAZ );
50 43
51 // Determine Projection(AZ on AB) / Length 44 // Determine Projection(AZ on AB) / Length(AB)
52 // 45 //
53 if( fABdistanceSq != 0.0 ) 46 if( fABdistanceSq != 0.0 )
54 { 47 {
55 // unit_projection= inner_prod * InvsqDis 48 // unit_projection= inner_prod * InvsqDistAB();
56 unit_projection = inner_prod/fABdistanceSq 49 unit_projection = inner_prod/fABdistanceSq;
57 50
58 if( (0. <= unit_projection ) && (unit_proj 51 if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
59 { 52 {
60 dist_sq= sq_VecAZ - unit_projection * i 53 dist_sq= sq_VecAZ - unit_projection * inner_prod ;
61 } 54 }
62 else 55 else
63 { 56 {
64 // The perpendicular from the point to t 57 // The perpendicular from the point to the line AB meets the line
65 // in a point outside the line segment! 58 // in a point outside the line segment!
66 59
67 if( unit_projection < 0. ) // A is the c 60 if( unit_projection < 0. ) // A is the closest point
68 { 61 {
69 dist_sq= sq_VecAZ; 62 dist_sq= sq_VecAZ;
70 } 63 }
71 else // B is the c 64 else // B is the closest point
72 { 65 {
73 G4ThreeVector EndpointB = EndpointA << 66 G4ThreeVector EndpointB = EndpointA + VecAtoB;
74 G4ThreeVector VecBZ = OtherPnt - 67 G4ThreeVector VecBZ = OtherPnt - EndpointB;
75 dist_sq = VecBZ.mag2(); 68 dist_sq = VecBZ.mag2();
76 } 69 }
77 } 70 }
78 } 71 }
79 else 72 else
80 { 73 {
81 dist_sq = (OtherPnt - EndpointA).mag2() ; 74 dist_sq = (OtherPnt - EndpointA).mag2() ;
82 } 75 }
83 if( dist_sq < 0.0 ) << 76 if( dist_sq < 0.0 ) dist_sq = 0.0 ;
84 { <<
85 dist_sq = 0.0 ; <<
86 } <<
87 77
88 return std::sqrt(dist_sq) ; 78 return std::sqrt(dist_sq) ;
89 } 79 }
90 80