source: trunk/source/geometry/solids/specific/include/G4TwistTrapParallelSide.hh@ 1316

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26//
27// $Id: G4TwistTrapParallelSide.hh,v 1.5 2006/06/29 18:47:50 gunter Exp $
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
51class 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 G4double fDy ; // temporary
154
155};
156
157//========================================================
158// inline functions
159//========================================================
160
161
162inline
163G4double G4TwistTrapParallelSide::GetValueB(G4double phi)
164{
165 return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
166}
167
168inline
169G4double G4TwistTrapParallelSide::Xcoef(G4double phi)
170{
171 return GetValueB(phi)/2. ;
172}
173
174inline G4ThreeVector
175G4TwistTrapParallelSide::
176SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
177{
178 // function to calculate a point on the surface, given by parameters phi,u
179
180 G4ThreeVector SurfPoint ( u*std::cos(phi) - Xcoef(phi)*std::sin(phi)
181 + fdeltaX*phi/fPhiTwist,
182 u*std::sin(phi) + Xcoef(phi)*std::cos(phi)
183 + fdeltaY*phi/fPhiTwist,
184 2*fDz*phi/fPhiTwist );
185 if (isGlobal) { return (fRot * SurfPoint + fTrans); }
186 return SurfPoint;
187}
188
189
190inline
191G4double G4TwistTrapParallelSide::GetBoundaryMin(G4double phi)
192{
193 return -(fPhiTwist*(fDx2 + fDx4 - fDy2plus1*fTAlph)
194 + 2*fDx4minus2*phi - 2*fDy2minus1*fTAlph*phi)/(2.*fPhiTwist) ;
195}
196
197inline
198G4double G4TwistTrapParallelSide::GetBoundaryMax(G4double phi)
199{
200 return (fDx2 + fDx4 + fDy2plus1*fTAlph)/ 2.
201 + ((fDx4minus2 + fDy2minus1*fTAlph)*phi)/fPhiTwist ;
202}
203
204inline
205G4double G4TwistTrapParallelSide::GetSurfaceArea()
206{
207 return 2*fDx4plus2*fDz ;
208}
209
210inline
211G4ThreeVector G4TwistTrapParallelSide::NormAng( G4double phi, G4double u )
212{
213 // function to calculate the norm at a given point on the surface
214 // replace a1-d1
215
216 G4ThreeVector nvec(-2*fDz*std::sin(phi) ,
217 2*fDz*std::cos(phi) ,
218 -(fDy2minus1 + fPhiTwist*u + fdeltaY*std::cos(phi)
219 -fdeltaX*std::sin(phi))) ;
220 return nvec.unit();
221}
222
223#endif
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