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1 // 1 //
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4LineSection implementation <<
27 // 26 //
28 // Created: J.Apostolakis, 1999 << 27 // $Id: G4LineSection.cc 66356 2012-12-18 09:02:32Z gcosmo $
>> 28 //
29 // ------------------------------------------- 29 // --------------------------------------------------------------------
30 30
31 #include "G4LineSection.hh" 31 #include "G4LineSection.hh"
32 32
33 G4LineSection::G4LineSection( const G4ThreeVec 33 G4LineSection::G4LineSection( const G4ThreeVector& PntA,
34 const G4ThreeVec << 34 const G4ThreeVector& PntB )
35 : EndpointA(PntA), VecAtoB(PntB-PntA) << 35 : EndpointA(PntA),
>> 36 VecAtoB(PntB-PntA)
36 { 37 {
37 fABdistanceSq = VecAtoB.mag2(); << 38 fABdistanceSq = VecAtoB.mag2() ;
>> 39 /*
>> 40 G4double distABsquared = VecAtoB.mag2() ;
>> 41 if ( distABsquared == 0.0)
>> 42 {
>> 43 G4Exception("G4LineSection::G4LineSection()", "GeomField0002",
>> 44 FatalException, "Equal points in input (line->point) ?") ;
>> 45 }
>> 46 else
>> 47 {
>> 48 inverse_square_distAB=1.0 / distABsquared ;
>> 49 }
>> 50 */
38 } 51 }
39 52
40 G4double G4LineSection::Dist( const G4ThreeVec << 53 G4double G4LineSection::Dist( G4ThreeVector OtherPnt ) const
41 { 54 {
42 G4double dist_sq; 55 G4double dist_sq;
43 G4ThreeVector VecAZ; 56 G4ThreeVector VecAZ;
44 G4double sq_VecAZ, inner_prod, unit_projecti 57 G4double sq_VecAZ, inner_prod, unit_projection ;
45 58
46 VecAZ= OtherPnt - EndpointA; 59 VecAZ= OtherPnt - EndpointA;
47 sq_VecAZ = VecAZ.mag2(); 60 sq_VecAZ = VecAZ.mag2();
48 61
49 inner_prod= VecAtoB.dot( VecAZ ); 62 inner_prod= VecAtoB.dot( VecAZ );
50 63
51 // Determine Projection(AZ on AB) / Length 64 // Determine Projection(AZ on AB) / Length(AB)
52 // 65 //
53 if( fABdistanceSq != 0.0 ) 66 if( fABdistanceSq != 0.0 )
54 { 67 {
55 // unit_projection= inner_prod * InvsqDis 68 // unit_projection= inner_prod * InvsqDistAB();
56 unit_projection = inner_prod/fABdistanceSq 69 unit_projection = inner_prod/fABdistanceSq;
57 70
58 if( (0. <= unit_projection ) && (unit_proj 71 if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
59 { 72 {
60 dist_sq= sq_VecAZ - unit_projection * i 73 dist_sq= sq_VecAZ - unit_projection * inner_prod ;
61 } 74 }
62 else 75 else
63 { 76 {
64 // The perpendicular from the point to t 77 // The perpendicular from the point to the line AB meets the line
65 // in a point outside the line segment! 78 // in a point outside the line segment!
66 79
67 if( unit_projection < 0. ) // A is the c 80 if( unit_projection < 0. ) // A is the closest point
68 { 81 {
69 dist_sq= sq_VecAZ; 82 dist_sq= sq_VecAZ;
70 } 83 }
71 else // B is the c 84 else // B is the closest point
72 { 85 {
73 G4ThreeVector EndpointB = EndpointA << 86 G4ThreeVector EndpointB = EndpointA + VecAtoB;
74 G4ThreeVector VecBZ = OtherPnt - 87 G4ThreeVector VecBZ = OtherPnt - EndpointB;
75 dist_sq = VecBZ.mag2(); 88 dist_sq = VecBZ.mag2();
76 } 89 }
77 } 90 }
78 } 91 }
79 else 92 else
80 { 93 {
81 dist_sq = (OtherPnt - EndpointA).mag2() ; 94 dist_sq = (OtherPnt - EndpointA).mag2() ;
82 } 95 }
83 if( dist_sq < 0.0 ) << 96 if( dist_sq < 0.0 ) dist_sq = 0.0 ;
84 { <<
85 dist_sq = 0.0 ; <<
86 } <<
87 97
88 return std::sqrt(dist_sq) ; 98 return std::sqrt(dist_sq) ;
>> 99 }
>> 100
>> 101 G4double G4LineSection::Distline( const G4ThreeVector& OtherPnt,
>> 102 const G4ThreeVector& LinePntA,
>> 103 const G4ThreeVector& LinePntB )
>> 104 {
>> 105 G4LineSection LineAB( LinePntA, LinePntB ); // Line from A to B
>> 106
>> 107 return LineAB.Dist( OtherPnt );
89 } 108 }
90 109