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25 // 25 //
26 // G4LineSection implementation <<
27 // 26 //
28 // Created: J.Apostolakis, 1999 << 27 // $Id: G4LineSection.cc,v 1.10 2006-06-29 18:24:16 gunter Exp $
>> 28 // GEANT4 tag $Name: not supported by cvs2svn $
>> 29 //
29 // ------------------------------------------- 30 // --------------------------------------------------------------------
30 31
31 #include "G4LineSection.hh" 32 #include "G4LineSection.hh"
32 33
33 G4LineSection::G4LineSection( const G4ThreeVec 34 G4LineSection::G4LineSection( const G4ThreeVector& PntA,
34 const G4ThreeVec << 35 const G4ThreeVector& PntB )
35 : EndpointA(PntA), VecAtoB(PntB-PntA) << 36 : EndpointA(PntA),
>> 37 VecAtoB(PntB-PntA)
36 { 38 {
37 fABdistanceSq = VecAtoB.mag2(); << 39 fABdistanceSq = VecAtoB.mag2() ;
>> 40 /*
>> 41 G4double distABsquared = VecAtoB.mag2() ;
>> 42 if ( distABsquared == 0.0)
>> 43 {
>> 44 G4Exception("G4LineSection::G4LineSection()", "GeomField0002",
>> 45 FatalException, "Equal points in input (line->point) ?") ;
>> 46 }
>> 47 else
>> 48 {
>> 49 inverse_square_distAB=1.0 / distABsquared ;
>> 50 }
>> 51 */
38 } 52 }
39 53
40 G4double G4LineSection::Dist( const G4ThreeVec << 54 G4double G4LineSection::Dist( G4ThreeVector OtherPnt ) const
41 { 55 {
42 G4double dist_sq; 56 G4double dist_sq;
43 G4ThreeVector VecAZ; 57 G4ThreeVector VecAZ;
44 G4double sq_VecAZ, inner_prod, unit_projecti 58 G4double sq_VecAZ, inner_prod, unit_projection ;
45 59
46 VecAZ= OtherPnt - EndpointA; 60 VecAZ= OtherPnt - EndpointA;
47 sq_VecAZ = VecAZ.mag2(); 61 sq_VecAZ = VecAZ.mag2();
48 62
49 inner_prod= VecAtoB.dot( VecAZ ); 63 inner_prod= VecAtoB.dot( VecAZ );
50 64
51 // Determine Projection(AZ on AB) / Length 65 // Determine Projection(AZ on AB) / Length(AB)
52 // 66 //
53 if( fABdistanceSq != 0.0 ) 67 if( fABdistanceSq != 0.0 )
54 { 68 {
55 // unit_projection= inner_prod * InvsqDis 69 // unit_projection= inner_prod * InvsqDistAB();
56 unit_projection = inner_prod/fABdistanceSq 70 unit_projection = inner_prod/fABdistanceSq;
57 71
58 if( (0. <= unit_projection ) && (unit_proj 72 if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
59 { 73 {
60 dist_sq= sq_VecAZ - unit_projection * i 74 dist_sq= sq_VecAZ - unit_projection * inner_prod ;
61 } 75 }
62 else 76 else
63 { 77 {
64 // The perpendicular from the point to t 78 // The perpendicular from the point to the line AB meets the line
65 // in a point outside the line segment! 79 // in a point outside the line segment!
66 80
67 if( unit_projection < 0. ) // A is the c 81 if( unit_projection < 0. ) // A is the closest point
68 { 82 {
69 dist_sq= sq_VecAZ; 83 dist_sq= sq_VecAZ;
70 } 84 }
71 else // B is the c 85 else // B is the closest point
72 { 86 {
73 G4ThreeVector EndpointB = EndpointA << 87 G4ThreeVector EndpointB = EndpointA + VecAtoB;
74 G4ThreeVector VecBZ = OtherPnt - 88 G4ThreeVector VecBZ = OtherPnt - EndpointB;
75 dist_sq = VecBZ.mag2(); 89 dist_sq = VecBZ.mag2();
76 } 90 }
77 } 91 }
78 } 92 }
79 else 93 else
80 { 94 {
81 dist_sq = (OtherPnt - EndpointA).mag2() ; 95 dist_sq = (OtherPnt - EndpointA).mag2() ;
82 } 96 }
83 if( dist_sq < 0.0 ) << 97 if( dist_sq < 0.0 ) dist_sq = 0.0 ;
84 { <<
85 dist_sq = 0.0 ; <<
86 } <<
87 98
88 return std::sqrt(dist_sq) ; 99 return std::sqrt(dist_sq) ;
>> 100 }
>> 101
>> 102 G4double G4LineSection::Distline( const G4ThreeVector& OtherPnt,
>> 103 const G4ThreeVector& LinePntA,
>> 104 const G4ThreeVector& LinePntB )
>> 105 {
>> 106 G4LineSection LineAB( LinePntA, LinePntB ); // Line from A to B
>> 107
>> 108 return LineAB.Dist( OtherPnt );
89 } 109 }
90 110