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25 // 25 //
26 // Implementation of G4EnclosingCylinder, a ut <<
27 // for a quick check of geometry. <<
28 // 26 //
29 // Author: David C. Williams (davidw@scipp.ucs << 27 // $Id: G4EnclosingCylinder.cc,v 1.10 2007/05/11 13:54:29 gcosmo Exp $
>> 28 // GEANT4 tag $Name: geant4-09-03-patch-01 $
>> 29 //
>> 30 //
>> 31 // --------------------------------------------------------------------
>> 32 // GEANT 4 class source file
>> 33 //
>> 34 //
>> 35 // G4EnclosingCylinder.cc
>> 36 //
>> 37 // Implementation of a utility class for a quick check of geometry.
>> 38 //
30 // ------------------------------------------- 39 // --------------------------------------------------------------------
31 40
32 #include "G4EnclosingCylinder.hh" 41 #include "G4EnclosingCylinder.hh"
33 #include "G4PhysicalConstants.hh" <<
34 #include "G4ReduciblePolygon.hh" 42 #include "G4ReduciblePolygon.hh"
35 #include "G4GeometryTolerance.hh" 43 #include "G4GeometryTolerance.hh"
36 44
>> 45 //
37 // Constructor 46 // Constructor
38 // 47 //
39 G4EnclosingCylinder::G4EnclosingCylinder( cons << 48 G4EnclosingCylinder::G4EnclosingCylinder( const G4ReduciblePolygon *rz,
40 49 G4bool thePhiIsOpen,
41 50 G4double theStartPhi,
42 51 G4double theTotalPhi )
43 : startPhi(theStartPhi), totalPhi(theTotalPh 52 : startPhi(theStartPhi), totalPhi(theTotalPhi),
>> 53 rx1(0.), ry1(0.), dx1(0.), dy1(0.),
>> 54 rx2(0.), ry2(0.), dx2(0.), dy2(0.),
44 concave(theTotalPhi > pi) 55 concave(theTotalPhi > pi)
45 { 56 {
46 // 57 //
47 // Obtain largest r and smallest and largest 58 // Obtain largest r and smallest and largest z
48 // 59 //
49 radius = rz->Amax(); 60 radius = rz->Amax();
50 zHi = rz->Bmax(); 61 zHi = rz->Bmax();
51 zLo = rz->Bmin(); 62 zLo = rz->Bmin();
52 63
53 G4double kCarTolerance = G4GeometryTolerance 64 G4double kCarTolerance = G4GeometryTolerance::GetInstance()
54 ->GetSurfaceToleran 65 ->GetSurfaceTolerance();
55 // 66 //
56 // Save phi info 67 // Save phi info
57 // 68 //
58 phiIsOpen = thePhiIsOpen; 69 phiIsOpen = thePhiIsOpen;
59 if ( phiIsOpen ) 70 if ( phiIsOpen )
60 { 71 {
61 rx1 = std::cos(startPhi); 72 rx1 = std::cos(startPhi);
62 ry1 = std::sin(startPhi); 73 ry1 = std::sin(startPhi);
63 dx1 = +ry1*10*kCarTolerance; 74 dx1 = +ry1*10*kCarTolerance;
64 dy1 = -rx1*10*kCarTolerance; 75 dy1 = -rx1*10*kCarTolerance;
65 76
66 rx2 = std::cos(startPhi+totalPhi); 77 rx2 = std::cos(startPhi+totalPhi);
67 ry2 = std::sin(startPhi+totalPhi); 78 ry2 = std::sin(startPhi+totalPhi);
68 dx2 = -ry2*10*kCarTolerance; 79 dx2 = -ry2*10*kCarTolerance;
69 dy2 = +rx2*10*kCarTolerance; 80 dy2 = +rx2*10*kCarTolerance;
70 } 81 }
71 82
72 // 83 //
73 // Add safety 84 // Add safety
74 // 85 //
75 radius += 10*kCarTolerance; 86 radius += 10*kCarTolerance;
76 zLo -= 10*kCarTolerance; 87 zLo -= 10*kCarTolerance;
77 zHi += 10*kCarTolerance; 88 zHi += 10*kCarTolerance;
78 } 89 }
79 90
>> 91 //
80 // Fake default constructor - sets only member 92 // Fake default constructor - sets only member data and allocates memory
81 // for usage restri 93 // for usage restricted to object persistency.
82 // 94 //
83 G4EnclosingCylinder::G4EnclosingCylinder( __vo 95 G4EnclosingCylinder::G4EnclosingCylinder( __void__& )
84 : radius(0.), zLo(0.), zHi(0.), phiIsOpen(fals <<
85 concave(false) <<
86 { 96 {
87 } 97 }
88 98
>> 99 //
>> 100 // Destructor
>> 101 //
>> 102 G4EnclosingCylinder::~G4EnclosingCylinder()
>> 103 {
>> 104 }
>> 105
>> 106
>> 107 //
89 // Outside 108 // Outside
90 // 109 //
91 // Decide very rapidly if the point is outside 110 // Decide very rapidly if the point is outside the cylinder
92 // 111 //
93 // If one is not certain, return false 112 // If one is not certain, return false
94 // 113 //
95 G4bool G4EnclosingCylinder::MustBeOutside( con << 114 G4bool G4EnclosingCylinder::MustBeOutside( const G4ThreeVector &p ) const
96 { 115 {
97 if (p.perp() > radius) return true; 116 if (p.perp() > radius) return true;
98 if (p.z() < zLo) return true; 117 if (p.z() < zLo) return true;
99 if (p.z() > zHi) return true; 118 if (p.z() > zHi) return true;
100 119
101 if (phiIsOpen) 120 if (phiIsOpen)
102 { 121 {
103 if (concave) 122 if (concave)
104 { 123 {
105 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) 124 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) < 0) return false;
106 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) 125 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) > 0) return false;
107 } 126 }
108 else 127 else
109 { 128 {
110 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) 129 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) > 0) return true;
111 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) 130 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) < 0) return true;
112 } 131 }
113 } 132 }
114 133
115 return false; 134 return false;
116 } 135 }
117 << 136
>> 137
>> 138 //
118 // Misses 139 // Misses
119 // 140 //
120 // Decide very rapidly if the trajectory is go 141 // Decide very rapidly if the trajectory is going to miss the cylinder
121 // 142 //
122 // If one is not sure, return false 143 // If one is not sure, return false
123 // 144 //
124 G4bool G4EnclosingCylinder::ShouldMiss( const << 145 G4bool G4EnclosingCylinder::ShouldMiss( const G4ThreeVector &p,
125 const << 146 const G4ThreeVector &v ) const
126 { 147 {
127 if (!MustBeOutside(p)) return false; 148 if (!MustBeOutside(p)) return false;
128 149
129 G4double cross = p.x()*v.y() - p.y()*v.x(); 150 G4double cross = p.x()*v.y() - p.y()*v.x();
130 if (cross > radius) return true; 151 if (cross > radius) return true;
131 152
132 if (p.perp() > radius) 153 if (p.perp() > radius)
133 { 154 {
134 G4double dot = p.x()*v.x() + p.y()*v.y(); 155 G4double dot = p.x()*v.x() + p.y()*v.y();
135 if (dot > 0) return true; 156 if (dot > 0) return true;
136 } 157 }
137 158
138 return false; 159 return false;
139 } 160 }
140 161