| Geant4 Cross Reference |
1 // 1 //
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15 // * use. Please see the license in the file << 14 // * use. *
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19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4LineSection implementation <<
27 // 23 //
28 // Created: J.Apostolakis, 1999 << 24 // $Id: G4LineSection.cc,v 1.9 2004/12/02 09:55:20 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-08-00-patch-01 $
>> 26 //
29 // ------------------------------------------- 27 // --------------------------------------------------------------------
30 28
31 #include "G4LineSection.hh" 29 #include "G4LineSection.hh"
32 30
33 G4LineSection::G4LineSection( const G4ThreeVec 31 G4LineSection::G4LineSection( const G4ThreeVector& PntA,
34 const G4ThreeVec << 32 const G4ThreeVector& PntB )
35 : EndpointA(PntA), VecAtoB(PntB-PntA) << 33 : EndpointA(PntA),
>> 34 VecAtoB(PntB-PntA)
36 { 35 {
37 fABdistanceSq = VecAtoB.mag2(); << 36 fABdistanceSq = VecAtoB.mag2() ;
>> 37 /*
>> 38 G4double distABsquared = VecAtoB.mag2() ;
>> 39 if ( distABsquared == 0.0)
>> 40 {
>> 41 G4Exception("G4LineSection::G4LineSection()", "WrongArgumentValue",
>> 42 FatalException, "Equal points in input (line->point) ?") ;
>> 43 }
>> 44 else
>> 45 {
>> 46 inverse_square_distAB=1.0 / distABsquared ;
>> 47 }
>> 48 */
38 } 49 }
39 50
40 G4double G4LineSection::Dist( const G4ThreeVec << 51 G4double G4LineSection::Dist( G4ThreeVector OtherPnt ) const
41 { 52 {
42 G4double dist_sq; 53 G4double dist_sq;
43 G4ThreeVector VecAZ; 54 G4ThreeVector VecAZ;
44 G4double sq_VecAZ, inner_prod, unit_projecti 55 G4double sq_VecAZ, inner_prod, unit_projection ;
45 56
46 VecAZ= OtherPnt - EndpointA; 57 VecAZ= OtherPnt - EndpointA;
47 sq_VecAZ = VecAZ.mag2(); 58 sq_VecAZ = VecAZ.mag2();
48 59
49 inner_prod= VecAtoB.dot( VecAZ ); 60 inner_prod= VecAtoB.dot( VecAZ );
50 61
51 // Determine Projection(AZ on AB) / Length 62 // Determine Projection(AZ on AB) / Length(AB)
52 // 63 //
53 if( fABdistanceSq != 0.0 ) 64 if( fABdistanceSq != 0.0 )
54 { 65 {
55 // unit_projection= inner_prod * InvsqDis 66 // unit_projection= inner_prod * InvsqDistAB();
56 unit_projection = inner_prod/fABdistanceSq 67 unit_projection = inner_prod/fABdistanceSq;
57 68
58 if( (0. <= unit_projection ) && (unit_proj 69 if( (0. <= unit_projection ) && (unit_projection <= 1.0 ) )
59 { 70 {
60 dist_sq= sq_VecAZ - unit_projection * i 71 dist_sq= sq_VecAZ - unit_projection * inner_prod ;
61 } 72 }
62 else 73 else
63 { 74 {
64 // The perpendicular from the point to t 75 // The perpendicular from the point to the line AB meets the line
65 // in a point outside the line segment! 76 // in a point outside the line segment!
66 77
67 if( unit_projection < 0. ) // A is the c 78 if( unit_projection < 0. ) // A is the closest point
68 { 79 {
69 dist_sq= sq_VecAZ; 80 dist_sq= sq_VecAZ;
70 } 81 }
71 else // B is the c 82 else // B is the closest point
72 { 83 {
73 G4ThreeVector EndpointB = EndpointA << 84 G4ThreeVector EndpointB = EndpointA + VecAtoB;
74 G4ThreeVector VecBZ = OtherPnt - 85 G4ThreeVector VecBZ = OtherPnt - EndpointB;
75 dist_sq = VecBZ.mag2(); 86 dist_sq = VecBZ.mag2();
76 } 87 }
77 } 88 }
78 } 89 }
79 else 90 else
80 { 91 {
81 dist_sq = (OtherPnt - EndpointA).mag2() ; 92 dist_sq = (OtherPnt - EndpointA).mag2() ;
82 } 93 }
83 if( dist_sq < 0.0 ) << 94 if( dist_sq < 0.0 ) dist_sq = 0.0 ;
84 { <<
85 dist_sq = 0.0 ; <<
86 } <<
87 95
88 return std::sqrt(dist_sq) ; 96 return std::sqrt(dist_sq) ;
>> 97 }
>> 98
>> 99 G4double G4LineSection::Distline( const G4ThreeVector& OtherPnt,
>> 100 const G4ThreeVector& LinePntA,
>> 101 const G4ThreeVector& LinePntB )
>> 102 {
>> 103 G4LineSection LineAB( LinePntA, LinePntB ); // Line from A to B
>> 104
>> 105 return LineAB.Dist( OtherPnt );
89 } 106 }
90 107