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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 1.3 2001/07/11 10:00:16 gunter Exp $
>> 25 // GEANT4 tag $Name: geant4-04-00 $
>> 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 <<
44 concave(theTotalPhi > pi) <<
45 { 48 {
46 // << 49 //
47 // Obtain largest r and smallest and largest << 50 // Obtain largest r and smallest and largest z
48 // << 51 //
49 radius = rz->Amax(); << 52 radius = rz->Amax();
50 zHi = rz->Bmax(); << 53 zHi = rz->Bmax();
51 zLo = rz->Bmin(); << 54 zLo = rz->Bmin();
52 << 55
53 G4double kCarTolerance = G4GeometryTolerance << 56 //
54 ->GetSurfaceToleran << 57 // Save phi info
55 // << 58 //
56 // Save phi info << 59 phiIsOpen = thePhiIsOpen;
57 // << 60 if ( phiIsOpen )
58 phiIsOpen = thePhiIsOpen; << 61 {
59 if ( phiIsOpen ) << 62 startPhi = theStartPhi;
60 { << 63 totalPhi = theTotalPhi;
61 rx1 = std::cos(startPhi); << 64
62 ry1 = std::sin(startPhi); << 65 rx1 = cos(startPhi);
63 dx1 = +ry1*10*kCarTolerance; << 66 ry1 = sin(startPhi);
64 dy1 = -rx1*10*kCarTolerance; << 67 dx1 = +ry1*10*kCarTolerance;
65 << 68 dy1 = -rx1*10*kCarTolerance;
66 rx2 = std::cos(startPhi+totalPhi); << 69
67 ry2 = std::sin(startPhi+totalPhi); << 70 rx2 = cos(startPhi+totalPhi);
68 dx2 = -ry2*10*kCarTolerance; << 71 ry2 = sin(startPhi+totalPhi);
69 dy2 = +rx2*10*kCarTolerance; << 72 dx2 = -ry2*10*kCarTolerance;
70 } << 73 dy2 = +rx2*10*kCarTolerance;
71 << 74
72 // << 75 concave = totalPhi > M_PI;
73 // Add safety << 76 }
74 // << 77
75 radius += 10*kCarTolerance; << 78 //
76 zLo -= 10*kCarTolerance; << 79 // Add safety
77 zHi += 10*kCarTolerance; << 80 //
>> 81 radius += 10*kCarTolerance;
>> 82 zLo -= 10*kCarTolerance;
>> 83 zHi += 10*kCarTolerance;
78 } 84 }
79 85
80 // Fake default constructor - sets only member <<
81 // for usage restri <<
82 // 86 //
83 G4EnclosingCylinder::G4EnclosingCylinder( __vo << 87 // Destructor
84 : radius(0.), zLo(0.), zHi(0.), phiIsOpen(fals << 88 //
85 concave(false) << 89 G4EnclosingCylinder::~G4EnclosingCylinder() {;}
86 { <<
87 } <<
88 90
>> 91
>> 92 //
89 // Outside 93 // Outside
90 // 94 //
91 // Decide very rapidly if the point is outside 95 // Decide very rapidly if the point is outside the cylinder
92 // 96 //
93 // If one is not certain, return false 97 // If one is not certain, return false
94 // 98 //
95 G4bool G4EnclosingCylinder::MustBeOutside( con << 99 G4bool G4EnclosingCylinder::MustBeOutside( const G4ThreeVector &p ) const
96 { 100 {
97 if (p.perp() > radius) return true; << 101 if (p.perp() > radius) return true;
98 if (p.z() < zLo) return true; << 102 if (p.z() < zLo) return true;
99 if (p.z() > zHi) return true; << 103 if (p.z() > zHi) return true;
100 << 104
101 if (phiIsOpen) << 105 if (phiIsOpen) {
102 { << 106 if (concave) {
103 if (concave) << 107 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) < 0) return false;
104 { << 108 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) > 0) return false;
105 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) << 109 }
106 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) << 110 else {
107 } << 111 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) > 0) return true;
108 else << 112 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) < 0) return true;
109 { << 113 }
110 if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) << 114 }
111 if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) << 115
112 } << 116 return false;
113 } <<
114 <<
115 return false; <<
116 } 117 }
117 << 118
>> 119
>> 120 //
118 // Misses 121 // Misses
119 // 122 //
120 // Decide very rapidly if the trajectory is go 123 // Decide very rapidly if the trajectory is going to miss the cylinder
121 // 124 //
122 // If one is not sure, return false 125 // If one is not sure, return false
123 // 126 //
124 G4bool G4EnclosingCylinder::ShouldMiss( const << 127 G4bool G4EnclosingCylinder::ShouldMiss( const G4ThreeVector &p, const G4ThreeVector &v ) const
125 const <<
126 { 128 {
127 if (!MustBeOutside(p)) return false; << 129 if (!MustBeOutside(p)) return false;
128 << 130
129 G4double cross = p.x()*v.y() - p.y()*v.x(); << 131 G4double cross = p.x()*v.y() - p.y()*v.x();
130 if (cross > radius) return true; << 132 if (cross > radius) return true;
131 << 133
132 if (p.perp() > radius) << 134 if (p.perp() > radius) {
133 { << 135 G4double dot = p.x()*v.x() + p.y()*v.y();
134 G4double dot = p.x()*v.x() + p.y()*v.y(); << 136 if (dot > 0) return true;
135 if (dot > 0) return true; << 137 }
136 } <<
137 138
138 return false; << 139 return false;
139 } << 140 }
140 141