source: trunk/source/geometry/solids/specific/include/G4TwistTrapAlphaSide.hh@ 1316

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26//
27// $Id: G4TwistTrapAlphaSide.hh,v 1.5 2006/06/29 18:47:46 gunter Exp $
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
51class 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
161inline
162G4double G4TwistTrapAlphaSide::GetValueA(G4double phi)
163{
164 return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist ) ;
165}
166
167inline
168G4double G4TwistTrapAlphaSide::GetValueD(G4double phi)
169{
170 return ( fDx3plus1 + fDx3minus1 * ( 2 * phi) / fPhiTwist ) ;
171}
172
173inline
174G4double G4TwistTrapAlphaSide::GetValueB(G4double phi)
175{
176 return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
177}
178
179
180inline
181G4double 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
189inline G4ThreeVector
190G4TwistTrapAlphaSide::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
203inline
204G4double G4TwistTrapAlphaSide::GetBoundaryMin(G4double phi)
205{
206 return -0.5*GetValueB(phi) ;
207}
208
209inline
210G4double G4TwistTrapAlphaSide::GetBoundaryMax(G4double phi)
211{
212 return 0.5*GetValueB(phi) ;
213}
214
215inline
216G4double 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
224inline
225G4ThreeVector 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
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