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25 //
26 // G4TwistTrapParallelSide
27 //
28 // Class description:
29 //
30 // Class describing a twisted boundary surface for a trapezoid.
31
32 // Author: 27-Oct-2004 - O.Link (Oliver.Link@cern.ch)
33 // --------------------------------------------------------------------
34 #ifndef G4TWISTTRAPPARALLELSIDE_HH
35 #define G4TWISTTRAPPARALLELSIDE_HH
36
37 #include "G4VTwistSurface.hh"
38
39 #include <vector>
40
41 class G4TwistTrapParallelSide : public G4VTwistSurface
42 {
43 public:
44
45 G4TwistTrapParallelSide(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 ~G4TwistTrapParallelSide() 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 G4TwistTrapParallelSide(__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 G4ThreeVector NormAng(G4double phi, G4double u);
103 inline G4double GetValueB(G4double phi) ;
104 inline G4double Xcoef(G4double u);
105 // To calculate the w(u) function
106
107 private:
108
109 G4double fTheta;
110 G4double fPhi ;
111
112 G4double fDy1;
113 G4double fDx1;
114 G4double fDx2;
115
116 G4double fDy2;
117 G4double fDx3;
118 G4double fDx4;
119
120 G4double fDz; // Half-length along the z axis
121
122 G4double fAlph;
123 G4double fTAlph; // std::tan(fAlph)
124
125 G4double fPhiTwist; // twist angle ( dphi in surface equation)
126
127 G4double fAngleSide;
128
129 G4double fdeltaX;
130 G4double fdeltaY;
131
132 G4double fDx4plus2; // fDx4 + fDx2 == a2/2 + a1/2
133 G4double fDx4minus2; // fDx4 - fDx2 -
134 G4double fDx3plus1; // fDx3 + fDx1 == d2/2 + d1/2
135 G4double fDx3minus1; // fDx3 - fDx1 -
136 G4double fDy2plus1; // fDy2 + fDy1 == b2/2 + b1/2
137 G4double fDy2minus1; // fDy2 - fDy1 -
138 G4double fa1md1; // 2 fDx2 - 2 fDx1 == a1 - d1
139 G4double fa2md2; // 2 fDx4 - 2 fDx3
140 };
141
142 //========================================================
143 // inline functions
144 //========================================================
145
146
147 inline
148 G4double G4TwistTrapParallelSide::GetValueB(G4double phi)
149 {
150 return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
151 }
152
153 inline
154 G4double G4TwistTrapParallelSide::Xcoef(G4double phi)
155 {
156 return GetValueB(phi)/2. ;
157 }
158
159 inline G4ThreeVector
160 G4TwistTrapParallelSide::
161 SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
162 {
163 // function to calculate a point on the surface, given by parameters phi,u
164
165 G4ThreeVector SurfPoint ( u*std::cos(phi) - Xcoef(phi)*std::sin(phi)
166 + fdeltaX*phi/fPhiTwist,
167 u*std::sin(phi) + Xcoef(phi)*std::cos(phi)
168 + fdeltaY*phi/fPhiTwist,
169 2*fDz*phi/fPhiTwist );
170 if (isGlobal) { return (fRot * SurfPoint + fTrans); }
171 return SurfPoint;
172 }
173
174
175 inline
176 G4double G4TwistTrapParallelSide::GetBoundaryMin(G4double phi)
177 {
178 return -(fPhiTwist*(fDx2 + fDx4 - fDy2plus1*fTAlph)
179 + 2*fDx4minus2*phi - 2*fDy2minus1*fTAlph*phi)/(2.*fPhiTwist) ;
180 }
181
182 inline
183 G4double G4TwistTrapParallelSide::GetBoundaryMax(G4double phi)
184 {
185 return (fDx2 + fDx4 + fDy2plus1*fTAlph)/ 2.
186 + ((fDx4minus2 + fDy2minus1*fTAlph)*phi)/fPhiTwist ;
187 }
188
189 inline
190 G4double G4TwistTrapParallelSide::GetSurfaceArea()
191 {
192 return 2*fDx4plus2*fDz ;
193 }
194
195 inline
196 G4ThreeVector G4TwistTrapParallelSide::NormAng( G4double phi, G4double u )
197 {
198 // function to calculate the norm at a given point on the surface
199 // replace a1-d1
200
201 G4ThreeVector nvec(-2*fDz*std::sin(phi) ,
202 2*fDz*std::cos(phi) ,
203 -(fDy2minus1 + fPhiTwist*u + fdeltaY*std::cos(phi)
204 -fdeltaX*std::sin(phi))) ;
205 return nvec.unit();
206 }
207
208 #endif
209