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1 //
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25 //
26 // G4TwistTubsSide
27 //
28 // Class description:
29 //
30 // Class describing a twisted boundary surface for a cylinder.
31
32 // 01-Aug-2002 - Kotoyo Hoshina (hoshina@hepburn.s.chiba-u.ac.jp), created
33 // 13-Nov-2003 - O.Link (Oliver.Link@cern.ch), Integration in Geant4
34 // from original version in Jupiter-2.5.02 application.
35 // --------------------------------------------------------------------
36 #ifndef G4TWISTTUBSSIDE_HH
37 #define G4TWISTTUBSSIDE_HH
38
39 #include "G4VTwistSurface.hh"
40
41 class G4TwistTubsSide : public G4VTwistSurface
42 {
43 public:
44
45 G4TwistTubsSide(const G4String& name,
46 const G4RotationMatrix& rot, // 0.5*(phi-width segment)
47 const G4ThreeVector& tlate,
48 G4int handedness, // R-hand = 1, L-hand = -1
49 const G4double kappa, // tan(TwistAngle/2)/fZHalfLen
50 const EAxis axis0 = kXAxis,
51 const EAxis axis1 = kZAxis,
52 G4double axis0min = -kInfinity,
53 G4double axis1min = -kInfinity,
54 G4double axis0max = kInfinity,
55 G4double axis1max = kInfinity );
56
57 G4TwistTubsSide(const G4String& name,
58 G4double EndInnerRadius[2],
59 G4double EndOuterRadius[2],
60 G4double DPhi,
61 G4double EndPhi[2],
62 G4double EndZ[2],
63 G4double InnerRadius,
64 G4double OuterRadius,
65 G4double Kappa,
66 G4int handedness);
67
68 ~G4TwistTubsSide() override;
69
70 G4ThreeVector GetNormal(const G4ThreeVector& xx,
71 G4bool isGlobal = false) override ;
72
73 G4int DistanceToSurface(const G4ThreeVector& gp,
74 const G4ThreeVector& gv,
75 G4ThreeVector gxx[],
76 G4double distance[],
77 G4int areacode[],
78 G4bool isvalid[],
79 EValidate validate = kValidateWithTol) override;
80
81 G4int DistanceToSurface(const G4ThreeVector& gp,
82 G4ThreeVector gxx[],
83 G4double distance[],
84 G4int areacode[]) override;
85
86 inline G4ThreeVector ProjectAtPXPZ(const G4ThreeVector& p,
87 G4bool isglobal = false) const ;
88
89 inline G4ThreeVector SurfacePoint(G4double, G4double,
90 G4bool isGlobal = false) override ;
91 inline G4double GetBoundaryMin(G4double phi) override ;
92 inline G4double GetBoundaryMax(G4double phi) override ;
93 inline G4double GetSurfaceArea() override ;
94 void GetFacets( G4int m, G4int n, G4double xyz[][3],
95 G4int faces[][4], G4int iside ) override ;
96
97 G4TwistTubsSide(__void__&);
98 // Fake default constructor for usage restricted to direct object
99 // persistency for clients requiring preallocation of memory for
100 // persistifiable objects.
101
102 private:
103
104 G4double DistanceToPlane(const G4ThreeVector& p,
105 const G4ThreeVector& A,
106 const G4ThreeVector& B,
107 const G4ThreeVector& C,
108 const G4ThreeVector& D,
109 const G4int parity,
110 G4ThreeVector& xx,
111 G4ThreeVector& n);
112
113 G4int GetAreaCode(const G4ThreeVector& xx,
114 G4bool withTol = true) override;
115
116 void SetCorners() override;
117
118 void SetCorners( G4double endInnerRad[2],
119 G4double endOuterRad[2],
120 G4double endPhi[2],
121 G4double endZ[2] ) ;
122
123 void SetBoundaries() override;
124
125 private:
126
127 G4double fKappa; // std::tan(TwistedAngle/2)/HalfLenZ;
128 };
129
130
131 //========================================================
132 // inline functions
133 //========================================================
134
135 inline
136 G4ThreeVector G4TwistTubsSide::ProjectAtPXPZ(const G4ThreeVector& p,
137 G4bool isglobal) const
138 {
139 // Get Rho at p.z() on Hyperbolic Surface.
140 G4ThreeVector tmpp;
141 if (isglobal) { tmpp = fRot.inverse()*p - fTrans; }
142 else { tmpp = p; }
143 G4ThreeVector xx(p.x(), p.x() * fKappa * p.z(), p.z());
144 if (isglobal) { return (fRot * xx + fTrans); }
145 return xx;
146 }
147
148 inline
149 G4ThreeVector
150 G4TwistTubsSide::SurfacePoint(G4double x, G4double z, G4bool isGlobal)
151 {
152 G4ThreeVector SurfPoint( x , x * fKappa * z , z ) ;
153
154 if (isGlobal) { return (fRot * SurfPoint + fTrans); }
155 return SurfPoint;
156 }
157
158 inline
159 G4double G4TwistTubsSide::GetBoundaryMin(G4double)
160 {
161 return fAxisMin[0] ; // inner radius at z = 0
162 }
163
164 inline
165 G4double G4TwistTubsSide::GetBoundaryMax(G4double)
166 {
167 return fAxisMax[0] ; // outer radius at z = 0
168 }
169
170 inline
171 G4double G4TwistTubsSide::GetSurfaceArea()
172 {
173 // approximation only
174 return ( fAxisMax[0] - fAxisMin[0] ) * ( fAxisMax[1] - fAxisMin[1] ) ;
175 }
176
177 #endif
178