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25 // 22 //
26 // Implementation of G4EnclosingCylinder, a ut <<
27 // for a quick check of geometry. <<
28 // 23 //
29 // Author: David C. Williams (davidw@scipp.ucs << 24 // $Id: G4EnclosingCylinder.cc,v 1.7 2004/12/10 16:22:38 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-07-00-patch-01 $
>> 26 //
>> 27 //
>> 28 // --------------------------------------------------------------------
>> 29 // GEANT 4 class source file
>> 30 //
>> 31 //
>> 32 // G4EnclosingCylinder.cc
>> 33 //
>> 34 // Implementation of a utility class for a quick check of geometry.
>> 35 //
30 // ------------------------------------------- 36 // --------------------------------------------------------------------
31 37
32 #include "G4EnclosingCylinder.hh" 38 #include "G4EnclosingCylinder.hh"
33 #include "G4PhysicalConstants.hh" <<
34 #include "G4ReduciblePolygon.hh" 39 #include "G4ReduciblePolygon.hh"
35 #include "G4GeometryTolerance.hh" <<
36 40
>> 41 //
37 // Constructor 42 // Constructor
38 // 43 //
39 G4EnclosingCylinder::G4EnclosingCylinder( cons << 44 G4EnclosingCylinder::G4EnclosingCylinder( const G4ReduciblePolygon *rz,
40 45 G4bool thePhiIsOpen,
41 46 G4double theStartPhi,
42 47 G4double theTotalPhi )
43 : startPhi(theStartPhi), totalPhi(theTotalPh 48 : startPhi(theStartPhi), totalPhi(theTotalPhi),
>> 49 rx1(0.), ry1(0.), dx1(0.), dy1(0.),
>> 50 rx2(0.), ry2(0.), dx2(0.), dy2(0.),
44 concave(theTotalPhi > pi) 51 concave(theTotalPhi > pi)
45 { 52 {
46 // 53 //
47 // Obtain largest r and smallest and largest 54 // Obtain largest r and smallest and largest z
48 // 55 //
49 radius = rz->Amax(); 56 radius = rz->Amax();
50 zHi = rz->Bmax(); 57 zHi = rz->Bmax();
51 zLo = rz->Bmin(); 58 zLo = rz->Bmin();
52 << 59
53 G4double kCarTolerance = G4GeometryTolerance <<
54 ->GetSurfaceToleran <<
55 // 60 //
56 // Save phi info 61 // Save phi info
57 // 62 //
58 phiIsOpen = thePhiIsOpen; 63 phiIsOpen = thePhiIsOpen;
59 if ( phiIsOpen ) 64 if ( phiIsOpen )
60 { 65 {
61 rx1 = std::cos(startPhi); 66 rx1 = std::cos(startPhi);
62 ry1 = std::sin(startPhi); 67 ry1 = std::sin(startPhi);
63 dx1 = +ry1*10*kCarTolerance; 68 dx1 = +ry1*10*kCarTolerance;
64 dy1 = -rx1*10*kCarTolerance; 69 dy1 = -rx1*10*kCarTolerance;
65 70
66 rx2 = std::cos(startPhi+totalPhi); 71 rx2 = std::cos(startPhi+totalPhi);
67 ry2 = std::sin(startPhi+totalPhi); 72 ry2 = std::sin(startPhi+totalPhi);
68 dx2 = -ry2*10*kCarTolerance; 73 dx2 = -ry2*10*kCarTolerance;
69 dy2 = +rx2*10*kCarTolerance; 74 dy2 = +rx2*10*kCarTolerance;
70 } 75 }
71 76
72 // 77 //
73 // Add safety 78 // Add safety
74 // 79 //
75 radius += 10*kCarTolerance; 80 radius += 10*kCarTolerance;
76 zLo -= 10*kCarTolerance; 81 zLo -= 10*kCarTolerance;
77 zHi += 10*kCarTolerance; 82 zHi += 10*kCarTolerance;
78 } 83 }
79 84
80 // Fake default constructor - sets only member <<
81 // for usage restri <<
82 // 85 //
83 G4EnclosingCylinder::G4EnclosingCylinder( __vo << 86 // Destructor
84 : radius(0.), zLo(0.), zHi(0.), phiIsOpen(fals << 87 //
85 concave(false) << 88 G4EnclosingCylinder::~G4EnclosingCylinder()
86 { 89 {
87 } 90 }
88 91
>> 92
>> 93 //
89 // Outside 94 // Outside
90 // 95 //
91 // Decide very rapidly if the point is outside 96 // Decide very rapidly if the point is outside the cylinder
92 // 97 //
93 // If one is not certain, return false 98 // If one is not certain, return false
94 // 99 //
95 G4bool G4EnclosingCylinder::MustBeOutside( con << 100 G4bool G4EnclosingCylinder::MustBeOutside( const G4ThreeVector &p ) const
96 { 101 {
97 if (p.perp() > radius) return true; 102 if (p.perp() > radius) return true;
98 if (p.z() < zLo) return true; 103 if (p.z() < zLo) return true;
99 if (p.z() > zHi) return true; 104 if (p.z() > zHi) return true;
100 105
101 if (phiIsOpen) 106 if (phiIsOpen)
102 { 107 {
103 if (concave) 108 if (concave)
104 { 109 {
105 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) 110 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) < 0) return false;
106 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) 111 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) > 0) return false;
107 } 112 }
108 else 113 else
109 { 114 {
110 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) 115 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) > 0) return true;
111 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) 116 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) < 0) return true;
112 } 117 }
113 } 118 }
114 119
115 return false; 120 return false;
116 } 121 }
117 << 122
>> 123
>> 124 //
118 // Misses 125 // Misses
119 // 126 //
120 // Decide very rapidly if the trajectory is go 127 // Decide very rapidly if the trajectory is going to miss the cylinder
121 // 128 //
122 // If one is not sure, return false 129 // If one is not sure, return false
123 // 130 //
124 G4bool G4EnclosingCylinder::ShouldMiss( const << 131 G4bool G4EnclosingCylinder::ShouldMiss( const G4ThreeVector &p,
125 const << 132 const G4ThreeVector &v ) const
126 { 133 {
127 if (!MustBeOutside(p)) return false; 134 if (!MustBeOutside(p)) return false;
128 135
129 G4double cross = p.x()*v.y() - p.y()*v.x(); 136 G4double cross = p.x()*v.y() - p.y()*v.x();
130 if (cross > radius) return true; 137 if (cross > radius) return true;
131 138
132 if (p.perp() > radius) 139 if (p.perp() > radius)
133 { 140 {
134 G4double dot = p.x()*v.x() + p.y()*v.y(); 141 G4double dot = p.x()*v.x() + p.y()*v.y();
135 if (dot > 0) return true; 142 if (dot > 0) return true;
136 } 143 }
137 144
138 return false; 145 return false;
139 } 146 }
140 147