Geant4  9.6.p02
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
G4TwistTrapAlphaSide.hh
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 // $Id: G4TwistTrapAlphaSide.hh 67011 2013-01-29 16:17:41Z gcosmo $
28 //
29 // --------------------------------------------------------------------
30 // GEANT 4 class header file
31 //
32 //
33 // G4TwistTrapAlphaSide
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 __G4TWISTTRAPALPHASIDE__
45 #define __G4TWISTTRAPALPHASIDE__
46 
47 #include "G4VTwistSurface.hh"
48 
49 #include <vector>
50 
51 class G4TwistTrapAlphaSide : public G4VTwistSurface
52 {
53  public: // with description
54 
55  G4TwistTrapAlphaSide(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 ~G4TwistTrapAlphaSide();
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 
89  public: // without description
90 
91  G4TwistTrapAlphaSide(__void__&);
92  // Fake default constructor for usage restricted to direct object
93  // persistency for clients requiring preallocation of memory for
94  // persistifiable objects.
95 
96  private:
97 
98  virtual G4int GetAreaCode(const G4ThreeVector &xx,
99  G4bool withTol = true);
100  virtual void SetCorners();
101  virtual void SetBoundaries();
102 
103  void GetPhiUAtX(G4ThreeVector p, G4double &phi, G4double &u);
104  G4ThreeVector ProjectPoint(const G4ThreeVector &p,
105  G4bool isglobal = false);
106 
107  virtual G4ThreeVector SurfacePoint(G4double phi, G4double u,
108  G4bool isGlobal = false );
109  virtual G4double GetBoundaryMin(G4double phi);
110  virtual G4double GetBoundaryMax(G4double phi);
111  virtual G4double GetSurfaceArea();
112  virtual void GetFacets( G4int m, G4int n, G4double xyz[][3],
113  G4int faces[][4], G4int iside );
114 
115  inline G4ThreeVector NormAng(G4double phi, G4double u);
116  inline G4double GetValueA(G4double phi);
117  inline G4double GetValueB(G4double phi);
118  inline G4double GetValueD(G4double phi);
119  inline G4double Xcoef(G4double u,G4double phi);
120  // To calculate the w(u) function
121 
122  private:
123 
124  G4double fTheta;
125  G4double fPhi ;
126 
127  G4double fDy1;
128  G4double fDx1;
129  G4double fDx2;
130 
131  G4double fDy2;
132  G4double fDx3;
133  G4double fDx4;
134 
135  G4double fDz; // Half-length along the z axis
136 
137  G4double fAlph;
138  G4double fTAlph; // std::tan(fAlph)
139 
140  G4double fPhiTwist; // twist angle (dphi in surface equation)
141 
142  G4double fAngleSide;
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  G4double fdeltaX;
154  G4double fdeltaY;
155 };
156 
157 //========================================================
158 // inline functions
159 //========================================================
160 
161 inline
162 G4double G4TwistTrapAlphaSide::GetValueA(G4double phi)
163 {
164  return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist ) ;
165 }
166 
167 inline
168 G4double G4TwistTrapAlphaSide::GetValueD(G4double phi)
169 {
170  return ( fDx3plus1 + fDx3minus1 * ( 2 * phi) / fPhiTwist ) ;
171 }
172 
173 inline
174 G4double G4TwistTrapAlphaSide::GetValueB(G4double phi)
175 {
176  return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
177 }
178 
179 
180 inline
181 G4double G4TwistTrapAlphaSide::Xcoef(G4double u, G4double phi)
182 {
183 
184  return GetValueA(phi)/2. + (GetValueD(phi)-GetValueA(phi))/4.
185  - u*( ( GetValueD(phi)-GetValueA(phi) )/( 2 * GetValueB(phi) ) - fTAlph );
186 
187 }
188 
189 inline G4ThreeVector
190 G4TwistTrapAlphaSide::SurfacePoint(G4double phi, G4double u , G4bool isGlobal)
191 {
192  // function to calculate a point on the surface, given by parameters phi,u
193 
194  G4ThreeVector SurfPoint ( Xcoef(u,phi) * std::cos(phi)
195  - u * std::sin(phi) + fdeltaX*phi/fPhiTwist,
196  Xcoef(u,phi) * std::sin(phi)
197  + u * std::cos(phi) + fdeltaY*phi/fPhiTwist,
198  2*fDz*phi/fPhiTwist );
199  if (isGlobal) { return (fRot * SurfPoint + fTrans); }
200  return SurfPoint;
201 }
202 
203 inline
204 G4double G4TwistTrapAlphaSide::GetBoundaryMin(G4double phi)
205 {
206  return -0.5*GetValueB(phi) ;
207 }
208 
209 inline
210 G4double G4TwistTrapAlphaSide::GetBoundaryMax(G4double phi)
211 {
212  return 0.5*GetValueB(phi) ;
213 }
214 
215 inline
216 G4double G4TwistTrapAlphaSide::GetSurfaceArea()
217 {
218  return (fDz*(std::sqrt(16*fDy1*fDy1
219  + (fa1md1 + 4*fDy1*fTAlph)*(fa1md1 + 4*fDy1*fTAlph))
220  + std::sqrt(16*fDy2*fDy2 + (fa2md2 + 4*fDy2*fTAlph)
221  * (fa2md2 + 4*fDy2*fTAlph))))/2. ;
222 }
223 
224 inline
225 G4ThreeVector G4TwistTrapAlphaSide::NormAng( G4double phi, G4double u )
226 {
227  // function to calculate the norm at a given point on the surface
228  // replace a1-d1
229 
230  G4ThreeVector nvec ( fDy1* fDz*(4*fDy1*std::cos(phi)
231  + (fa1md1 + 4*fDy1*fTAlph)*std::sin(phi)),
232  -(fDy1* fDz*((fa1md1 + 4*fDy1*fTAlph)*std::cos(phi)
233  - 4*fDy1*std::sin(phi))),
234  (fDy1*(-8*(fDx3minus1 + fDx4minus2)*fDy1
235  + fa1md1*(fDx2 + fDx3plus1 + fDx4)*fPhiTwist
236  + 4*(fDx2 + fDx3plus1 + fDx4)*fDy1*fPhiTwist
237  *fTAlph + 2*(fDx3minus1 + fDx4minus2)
238  *(fa1md1 + 4*fDy1*fTAlph)*phi)
239  + fPhiTwist*(16*fDy1*fDy1
240  + (fa1md1 + 4*fDy1*fTAlph)
241  *(fa1md1 + 4*fDy1*fTAlph))*u
242  + 4*fDy1*(fa1md1*fdeltaY - 4*fdeltaX*fDy1
243  + 4*fdeltaY*fDy1*fTAlph)* std::cos(phi)
244  - 4*fDy1*(fa1md1*fdeltaX + 4*fDy1*(fdeltaY
245  + fdeltaX*fTAlph))*std::sin(phi))/ 8. ) ;
246  return nvec.unit();
247 }
248 
249 #endif
Generated on Sat May 25 2013 14:33:15 for Geant4 by   doxygen 1.8.4