| Geant4 Cross Reference |
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25 //
26 // G4TwistBoxSide
27 //
28 // Class description:
29 //
30 // G4TwistBoxSide describes a twisted boundary surface for a trapezoid.
31
32 // Author: 27-Oct-2004 - O.Link (Oliver.Link@cern.ch)
33 // --------------------------------------------------------------------
34 #ifndef G4TWISTBOXSIDE_HH
35 #define G4TWISTBOXSIDE_HH
36
37 #include "G4VTwistSurface.hh"
38
39 #include <vector>
40
41 class G4TwistBoxSide : public G4VTwistSurface
42 {
43 public:
44
45 G4TwistBoxSide(const G4String& name,
46 G4double PhiTwist, // twist angle
47 G4double pDz, // half z lenght
48 G4double pTheta, // direction between end planes
49 G4double pPhi, // by polar and azimutal angles
50 G4double pDy1, // half y length at -pDz
51 G4double pDx1, // half x length at -pDz,-pDy
52 G4double pDx2, // half x length at -pDz,+pDy
53 G4double pDy2, // half y length at +pDz
54 G4double pDx3, // half x length at +pDz,-pDy
55 G4double pDx4, // half x length at +pDz,+pDy
56 G4double pAlph, // tilt angle at +pDz
57 G4double AngleSide // parity
58 );
59
60 ~G4TwistBoxSide() override;
61
62 G4ThreeVector GetNormal(const G4ThreeVector& xx,
63 G4bool isGlobal = false) override ;
64
65 G4int DistanceToSurface(const G4ThreeVector& gp,
66 const G4ThreeVector& gv,
67 G4ThreeVector gxx[],
68 G4double distance[],
69 G4int areacode[],
70 G4bool isvalid[],
71 EValidate validate = kValidateWithTol) override;
72
73 G4int DistanceToSurface(const G4ThreeVector& gp,
74 G4ThreeVector gxx[],
75 G4double distance[],
76 G4int areacode[]) override;
77
78 G4TwistBoxSide(__void__&);
79 // Fake default constructor for usage restricted to direct object
80 // persistency for clients requiring preallocation of memory for
81 // persistifiable objects.
82
83 private:
84
85 G4int GetAreaCode(const G4ThreeVector& xx,
86 G4bool withTol = true) override;
87 void SetCorners() override;
88 void SetBoundaries() override;
89
90 void GetPhiUAtX(const G4ThreeVector& p, G4double& phi, G4double& u);
91 G4ThreeVector ProjectPoint(const G4ThreeVector& p,
92 G4bool isglobal = false);
93
94 inline G4ThreeVector SurfacePoint(G4double phi, G4double u,
95 G4bool isGlobal = false) override;
96 inline G4double GetBoundaryMin(G4double phi) override;
97 inline G4double GetBoundaryMax(G4double phi) override;
98 inline G4double GetSurfaceArea() override;
99 void GetFacets( G4int m, G4int n, G4double xyz[][3],
100 G4int faces[][4], G4int iside ) override;
101
102 inline G4double GetValueA(G4double phi);
103 inline G4double GetValueB(G4double phi);
104 inline G4ThreeVector NormAng(G4double phi, G4double u);
105 inline G4double Xcoef(G4double u, G4double phi);
106 // To calculate the w(u) function
107
108 private:
109
110 G4double fTheta;
111 G4double fPhi ;
112
113 G4double fDy1;
114 G4double fDx1;
115 G4double fDx2;
116
117 G4double fDy2;
118 G4double fDx3;
119 G4double fDx4;
120
121 G4double fDz; // Half-length along the z axis
122
123 G4double fAlph;
124 G4double fTAlph; // std::tan(fAlph)
125
126 G4double fPhiTwist; // twist angle ( dphi in surface equation)
127
128 G4double fAngleSide;
129
130 G4double fdeltaX;
131 G4double fdeltaY;
132
133 G4double fDx4plus2; // fDx4 + fDx2 == a2/2 + a1/2
134 G4double fDx4minus2; // fDx4 - fDx2 -
135 G4double fDx3plus1; // fDx3 + fDx1 == d2/2 + d1/2
136 G4double fDx3minus1; // fDx3 - fDx1 -
137 G4double fDy2plus1; // fDy2 + fDy1 == b2/2 + b1/2
138 G4double fDy2minus1; // fDy2 - fDy1 -
139 G4double fa1md1; // 2 fDx2 - 2 fDx1 == a1 - d1
140 G4double fa2md2; // 2 fDx4 - 2 fDx3
141 };
142
143 //========================================================
144 // inline functions
145 //========================================================
146
147 inline
148 G4double G4TwistBoxSide::GetValueA(G4double phi)
149 {
150 return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist ) ;
151 }
152
153
154 inline
155 G4double G4TwistBoxSide::GetValueB(G4double phi)
156 {
157 return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
158 }
159
160 inline
161 G4double G4TwistBoxSide::Xcoef(G4double u, G4double phi)
162 {
163
164 return GetValueA(phi)/2. + u*fTAlph ;
165
166 }
167
168 inline G4ThreeVector
169 G4TwistBoxSide::SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
170 {
171 // function to calculate a point on the surface, given by parameters phi,u
172
173 G4ThreeVector SurfPoint ( Xcoef(u,phi) * std::cos(phi)
174 - u * std::sin(phi) + fdeltaX*phi/fPhiTwist,
175 Xcoef(u,phi) * std::sin(phi)
176 + u * std::cos(phi) + fdeltaY*phi/fPhiTwist,
177 2*fDz*phi/fPhiTwist );
178
179 if (isGlobal) { return (fRot * SurfPoint + fTrans); }
180 return SurfPoint;
181 }
182
183 inline
184 G4double G4TwistBoxSide::GetBoundaryMin(G4double phi)
185 {
186 return -0.5*GetValueB(phi) ;
187 }
188
189 inline
190 G4double G4TwistBoxSide::GetBoundaryMax(G4double phi)
191 {
192 return 0.5*GetValueB(phi) ;
193 }
194
195 inline
196 G4double G4TwistBoxSide::GetSurfaceArea()
197 {
198 return (fDz*(std::sqrt(16*fDy1*fDy1
199 + (fa1md1 + 4*fDy1*fTAlph)*(fa1md1 + 4*fDy1*fTAlph))
200 + std::sqrt(16*fDy1*fDy1 + (fa2md2 + 4*fDy1*fTAlph)
201 * (fa2md2 + 4*fDy1*fTAlph))))/2. ;
202 }
203
204 inline
205 G4ThreeVector G4TwistBoxSide::NormAng( G4double phi, G4double u )
206 {
207 // function to calculate the norm at a given point on the surface
208 // replace a1-d1
209
210 G4ThreeVector nvec( 4*fDz*(std::cos(phi) + fTAlph*std::sin(phi)) ,
211 4*fDz*(-(fTAlph*std::cos(phi)) + std::sin(phi)),
212 (fDx2 + fDx4)*fPhiTwist*fTAlph
213 + 2*fDx4minus2*(-1 + fTAlph*phi)
214 + 2*fPhiTwist*(1 + fTAlph*fTAlph)*u
215 - 2*(fdeltaX - fdeltaY*fTAlph)*std::cos(phi)
216 - 2*(fdeltaY + fdeltaX*fTAlph)*std::sin(phi) );
217 return nvec.unit();
218 }
219
220 #endif
221