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G4TwistBoxSide.hh
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27 // $Id: G4TwistBoxSide.hh 67011 2013-01-29 16:17:41Z gcosmo $
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29 // --------------------------------------------------------------------
30 // GEANT 4 class header file
31 //
32 //
33 // G4TwistBoxSide
34 //
35 // Class description:
36 //
37 // Class describing a twisted boundary surface for a trapezoid.
38 
39 // Author:
40 //
41 // 27-Oct-2004 - O.Link (Oliver.Link@cern.ch)
42 //
43 // --------------------------------------------------------------------
44 #ifndef __G4TWISTBOXSIDE__
45 #define __G4TWISTBOXSIDE__
46 
47 #include "G4VTwistSurface.hh"
48 
49 #include <vector>
50 
51 class G4TwistBoxSide : public G4VTwistSurface
52 {
53  public: // with description
54 
55  G4TwistBoxSide(const G4String &name,
56  G4double PhiTwist, // twist angle
57  G4double pDz, // half z lenght
58  G4double pTheta, // direction between end planes
59  G4double pPhi, // by polar and azimutal angles
60  G4double pDy1, // half y length at -pDz
61  G4double pDx1, // half x length at -pDz,-pDy
62  G4double pDx2, // half x length at -pDz,+pDy
63  G4double pDy2, // half y length at +pDz
64  G4double pDx3, // half x length at +pDz,-pDy
65  G4double pDx4, // half x length at +pDz,+pDy
66  G4double pAlph, // tilt angle at +pDz
67  G4double AngleSide // parity
68  );
69 
70  virtual ~G4TwistBoxSide();
71 
72  virtual G4ThreeVector GetNormal(const G4ThreeVector &xx,
73  G4bool isGlobal = false) ;
74 
75  virtual G4int DistanceToSurface(const G4ThreeVector &gp,
76  const G4ThreeVector &gv,
77  G4ThreeVector gxx[],
78  G4double distance[],
79  G4int areacode[],
80  G4bool isvalid[],
81  EValidate validate = kValidateWithTol);
82 
83  virtual G4int DistanceToSurface(const G4ThreeVector &gp,
84  G4ThreeVector gxx[],
85  G4double distance[],
86  G4int areacode[]);
87 
88  public: // without description
89 
90  G4TwistBoxSide(__void__&);
91  // Fake default constructor for usage restricted to direct object
92  // persistency for clients requiring preallocation of memory for
93  // persistifiable objects.
94 
95  private:
96 
97  virtual G4int GetAreaCode(const G4ThreeVector &xx,
98  G4bool withTol = true);
99  virtual void SetCorners();
100  virtual void SetBoundaries();
101 
102  void GetPhiUAtX(G4ThreeVector p, G4double &phi, G4double &u);
103  G4ThreeVector ProjectPoint(const G4ThreeVector &p,
104  G4bool isglobal = false);
105 
106  virtual G4ThreeVector SurfacePoint(G4double phi, G4double u,
107  G4bool isGlobal = false);
108  virtual G4double GetBoundaryMin(G4double phi);
109  virtual G4double GetBoundaryMax(G4double phi);
110  virtual G4double GetSurfaceArea();
111  virtual void GetFacets( G4int m, G4int n, G4double xyz[][3],
112  G4int faces[][4], G4int iside );
113 
114  inline G4double GetValueA(G4double phi);
115  inline G4double GetValueB(G4double phi);
116  inline G4ThreeVector NormAng(G4double phi, G4double u);
117  inline G4double Xcoef(G4double u,G4double phi);
118  // To calculate the w(u) function
119 
120  private:
121 
122  G4double fTheta;
123  G4double fPhi ;
124 
125  G4double fDy1;
126  G4double fDx1;
127  G4double fDx2;
128 
129  G4double fDy2;
130  G4double fDx3;
131  G4double fDx4;
132 
133  G4double fDz; // Half-length along the z axis
134 
135  G4double fAlph;
136  G4double fTAlph; // std::tan(fAlph)
137 
138  G4double fPhiTwist; // twist angle ( dphi in surface equation)
139 
140  G4double fAngleSide;
141 
142  G4double fdeltaX;
143  G4double fdeltaY;
144 
145  G4double fDx4plus2; // fDx4 + fDx2 == a2/2 + a1/2
146  G4double fDx4minus2; // fDx4 - fDx2 -
147  G4double fDx3plus1; // fDx3 + fDx1 == d2/2 + d1/2
148  G4double fDx3minus1; // fDx3 - fDx1 -
149  G4double fDy2plus1; // fDy2 + fDy1 == b2/2 + b1/2
150  G4double fDy2minus1; // fDy2 - fDy1 -
151  G4double fa1md1; // 2 fDx2 - 2 fDx1 == a1 - d1
152  G4double fa2md2; // 2 fDx4 - 2 fDx3
153 };
154 
155 //========================================================
156 // inline functions
157 //========================================================
158 
159 inline
160 G4double G4TwistBoxSide::GetValueA(G4double phi)
161 {
162  return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist ) ;
163 }
164 
165 
166 inline
167 G4double G4TwistBoxSide::GetValueB(G4double phi)
168 {
169  return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
170 }
171 
172 inline
173 G4double G4TwistBoxSide::Xcoef(G4double u, G4double phi)
174 {
175 
176  return GetValueA(phi)/2. + u*fTAlph ;
177 
178 }
179 
180 inline G4ThreeVector
181 G4TwistBoxSide::SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
182 {
183  // function to calculate a point on the surface, given by parameters phi,u
184 
185  G4ThreeVector SurfPoint ( Xcoef(u,phi) * std::cos(phi)
186  - u * std::sin(phi) + fdeltaX*phi/fPhiTwist,
187  Xcoef(u,phi) * std::sin(phi)
188  + u * std::cos(phi) + fdeltaY*phi/fPhiTwist,
189  2*fDz*phi/fPhiTwist );
190 
191  if (isGlobal) { return (fRot * SurfPoint + fTrans); }
192  return SurfPoint;
193 }
194 
195 inline
196 G4double G4TwistBoxSide::GetBoundaryMin(G4double phi)
197 {
198  return -0.5*GetValueB(phi) ;
199 }
200 
201 inline
202 G4double G4TwistBoxSide::GetBoundaryMax(G4double phi)
203 {
204  return 0.5*GetValueB(phi) ;
205 }
206 
207 inline
208 G4double G4TwistBoxSide::GetSurfaceArea()
209 {
210  return (fDz*(std::sqrt(16*fDy1*fDy1
211  + (fa1md1 + 4*fDy1*fTAlph)*(fa1md1 + 4*fDy1*fTAlph))
212  + std::sqrt(16*fDy1*fDy1 + (fa2md2 + 4*fDy1*fTAlph)
213  * (fa2md2 + 4*fDy1*fTAlph))))/2. ;
214 }
215 
216 inline
217 G4ThreeVector G4TwistBoxSide::NormAng( G4double phi, G4double u )
218 {
219  // function to calculate the norm at a given point on the surface
220  // replace a1-d1
221 
222  G4ThreeVector nvec( 4*fDz*(std::cos(phi) + fTAlph*std::sin(phi)) ,
223  4*fDz*(-(fTAlph*std::cos(phi)) + std::sin(phi)),
224  (fDx2 + fDx4)*fPhiTwist*fTAlph
225  + 2*fDx4minus2*(-1 + fTAlph*phi)
226  + 2*fPhiTwist*(1 + fTAlph*fTAlph)*u
227  - 2*(fdeltaX - fdeltaY*fTAlph)*std::cos(phi)
228  - 2*(fdeltaY + fdeltaX*fTAlph)*std::sin(phi) );
229  return nvec.unit();
230 }
231 
232 #endif
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