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