include/Geant4/G4TwistBoxSide.icc

0001 //
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0024 // ********************************************************************
0025 //
0026 // Implementation of inline methods of G4TwistBoxSide
0027 // --------------------------------------------------------------------
0028
0029 inline
0030 G4double G4TwistBoxSide::GetValueA(G4double phi)
0031 {
0032   return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist  ) ;
0033 }
0034
0035
0036 inline
0037 G4double G4TwistBoxSide::GetValueB(G4double phi)
0038 {
0039   return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
0040 }
0041
0042 inline
0043 G4double G4TwistBoxSide::Xcoef(G4double u, G4double phi)
0044 {
0045
0046   return GetValueA(phi)/2. + u*fTAlph    ;
0047
0048 }
0049
0050 inline G4ThreeVector
0051 G4TwistBoxSide::SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
0052 {
0053   // function to calculate a point on the surface, given by parameters phi,u
0054
0055   G4ThreeVector SurfPoint ( Xcoef(u,phi) * std::cos(phi)
0056                           - u * std::sin(phi) + fdeltaX*phi/fPhiTwist,
0057                             Xcoef(u,phi) * std::sin(phi)
0058                           + u * std::cos(phi) + fdeltaY*phi/fPhiTwist,
0059                             2*fDz*phi/fPhiTwist  );
0060
0061   if (isGlobal) { return (fRot * SurfPoint + fTrans); }
0062   return SurfPoint;
0063 }
0064
0065 inline
0066 G4double G4TwistBoxSide::GetBoundaryMin(G4double phi)
0067 {
0068   return -0.5*GetValueB(phi) ;
0069 }
0070
0071 inline
0072 G4double G4TwistBoxSide::GetBoundaryMax(G4double phi)
0073 {
0074   return 0.5*GetValueB(phi) ;
0075 }
0076
0077 inline
0078 G4double G4TwistBoxSide::GetSurfaceArea()
0079 {
0080   return (fDz*(std::sqrt(16*fDy1*fDy1
0081          + (fa1md1 + 4*fDy1*fTAlph)*(fa1md1 + 4*fDy1*fTAlph))
0082          + std::sqrt(16*fDy1*fDy1 + (fa2md2 + 4*fDy1*fTAlph)
0083          * (fa2md2 + 4*fDy1*fTAlph))))/2. ;
0084 }
0085
0086 inline
0087 G4ThreeVector G4TwistBoxSide::NormAng( G4double phi, G4double u )
0088 {
0089   // function to calculate the norm at a given point on the surface
0090   // replace a1-d1
0091
0092   G4ThreeVector nvec( 4*fDz*(std::cos(phi) + fTAlph*std::sin(phi)) ,
0093                       4*fDz*(-(fTAlph*std::cos(phi)) + std::sin(phi)),
0094                       (fDx2 + fDx4)*fPhiTwist*fTAlph
0095                                    + 2*fDx4minus2*(-1 + fTAlph*phi)
0096                                    + 2*fPhiTwist*(1 + fTAlph*fTAlph)*u
0097                                 - 2*(fdeltaX - fdeltaY*fTAlph)*std::cos(phi)
0098                                 - 2*(fdeltaY + fdeltaX*fTAlph)*std::sin(phi) );
0099   return nvec.unit();
0100 }