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G4TwistTrapParallelSide.hh
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27 // $Id: G4TwistTrapParallelSide.hh 69790 2013-05-15 12:39:10Z gcosmo $
28 //
29 // --------------------------------------------------------------------
30 // GEANT 4 class header file
31 //
32 //
33 // G4TwistTrapParallelSide
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 __G4TWISTTRAPPARALLELSIDE__
45 #define __G4TWISTTRAPPARALLELSIDE__
46 
47 #include "G4VTwistSurface.hh"
48 
49 #include <vector>
50 
51 class G4TwistTrapParallelSide : public G4VTwistSurface
52 {
53  public: // with description
54 
55  G4TwistTrapParallelSide(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 ~G4TwistTrapParallelSide();
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  G4TwistTrapParallelSide(__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 G4ThreeVector NormAng(G4double phi, G4double u);
115  inline G4double GetValueB(G4double phi) ;
116  inline G4double Xcoef(G4double u);
117  // To calculate the w(u) function
118 
119  private:
120 
121  G4double fTheta;
122  G4double fPhi ;
123 
124  G4double fDy1;
125  G4double fDx1;
126  G4double fDx2;
127 
128  G4double fDy2;
129  G4double fDx3;
130  G4double fDx4;
131 
132  G4double fDz; // Half-length along the z axis
133 
134  G4double fAlph;
135  G4double fTAlph; // std::tan(fAlph)
136 
137  G4double fPhiTwist; // twist angle ( dphi in surface equation)
138 
139  G4double fAngleSide;
140 
141  G4double fdeltaX;
142  G4double fdeltaY;
143 
144  G4double fDx4plus2; // fDx4 + fDx2 == a2/2 + a1/2
145  G4double fDx4minus2; // fDx4 - fDx2 -
146  G4double fDx3plus1; // fDx3 + fDx1 == d2/2 + d1/2
147  G4double fDx3minus1; // fDx3 - fDx1 -
148  G4double fDy2plus1; // fDy2 + fDy1 == b2/2 + b1/2
149  G4double fDy2minus1; // fDy2 - fDy1 -
150  G4double fa1md1; // 2 fDx2 - 2 fDx1 == a1 - d1
151  G4double fa2md2; // 2 fDx4 - 2 fDx3
152 };
153 
154 //========================================================
155 // inline functions
156 //========================================================
157 
158 
159 inline
160 G4double G4TwistTrapParallelSide::GetValueB(G4double phi)
161 {
162  return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
163 }
164 
165 inline
166 G4double G4TwistTrapParallelSide::Xcoef(G4double phi)
167 {
168  return GetValueB(phi)/2. ;
169 }
170 
171 inline G4ThreeVector
172 G4TwistTrapParallelSide::
173 SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
174 {
175  // function to calculate a point on the surface, given by parameters phi,u
176 
177  G4ThreeVector SurfPoint ( u*std::cos(phi) - Xcoef(phi)*std::sin(phi)
178  + fdeltaX*phi/fPhiTwist,
179  u*std::sin(phi) + Xcoef(phi)*std::cos(phi)
180  + fdeltaY*phi/fPhiTwist,
181  2*fDz*phi/fPhiTwist );
182  if (isGlobal) { return (fRot * SurfPoint + fTrans); }
183  return SurfPoint;
184 }
185 
186 
187 inline
188 G4double G4TwistTrapParallelSide::GetBoundaryMin(G4double phi)
189 {
190  return -(fPhiTwist*(fDx2 + fDx4 - fDy2plus1*fTAlph)
191  + 2*fDx4minus2*phi - 2*fDy2minus1*fTAlph*phi)/(2.*fPhiTwist) ;
192 }
193 
194 inline
195 G4double G4TwistTrapParallelSide::GetBoundaryMax(G4double phi)
196 {
197  return (fDx2 + fDx4 + fDy2plus1*fTAlph)/ 2.
198  + ((fDx4minus2 + fDy2minus1*fTAlph)*phi)/fPhiTwist ;
199 }
200 
201 inline
202 G4double G4TwistTrapParallelSide::GetSurfaceArea()
203 {
204  return 2*fDx4plus2*fDz ;
205 }
206 
207 inline
208 G4ThreeVector G4TwistTrapParallelSide::NormAng( G4double phi, G4double u )
209 {
210  // function to calculate the norm at a given point on the surface
211  // replace a1-d1
212 
213  G4ThreeVector nvec(-2*fDz*std::sin(phi) ,
214  2*fDz*std::cos(phi) ,
215  -(fDy2minus1 + fPhiTwist*u + fdeltaY*std::cos(phi)
216  -fdeltaX*std::sin(phi))) ;
217  return nvec.unit();
218 }
219 
220 #endif
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