Gabriele Cosmo
223 lines
8.1 KiB
C++
223 lines
8.1 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4TwistBoxSide
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//
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// Class description:
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//
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// G4TwistBoxSide describes a twisted boundary surface for a trapezoid.
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// Author: 27-Oct-2004 - O.Link (Oliver.Link@cern.ch)
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// --------------------------------------------------------------------
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#ifndef G4TWISTBOXSIDE_HH
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#define G4TWISTBOXSIDE_HH
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#include "G4VTwistSurface.hh"
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#include <vector>
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class G4TwistBoxSide : public G4VTwistSurface
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{
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public: // with description
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G4TwistBoxSide(const G4String& name,
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G4double PhiTwist, // twist angle
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G4double pDz, // half z lenght
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G4double pTheta, // direction between end planes
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G4double pPhi, // by polar and azimutal angles
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G4double pDy1, // half y length at -pDz
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G4double pDx1, // half x length at -pDz,-pDy
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G4double pDx2, // half x length at -pDz,+pDy
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G4double pDy2, // half y length at +pDz
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G4double pDx3, // half x length at +pDz,-pDy
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G4double pDx4, // half x length at +pDz,+pDy
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G4double pAlph, // tilt angle at +pDz
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G4double AngleSide // parity
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);
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virtual ~G4TwistBoxSide();
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virtual G4ThreeVector GetNormal(const G4ThreeVector& xx,
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G4bool isGlobal = false) ;
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virtual G4int DistanceToSurface(const G4ThreeVector& gp,
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const G4ThreeVector& gv,
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G4ThreeVector gxx[],
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G4double distance[],
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G4int areacode[],
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G4bool isvalid[],
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EValidate validate = kValidateWithTol);
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virtual G4int DistanceToSurface(const G4ThreeVector& gp,
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G4ThreeVector gxx[],
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G4double distance[],
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G4int areacode[]);
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public: // without description
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G4TwistBoxSide(__void__&);
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// Fake default constructor for usage restricted to direct object
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// persistency for clients requiring preallocation of memory for
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// persistifiable objects.
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private:
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virtual G4int GetAreaCode(const G4ThreeVector& xx,
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G4bool withTol = true);
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virtual void SetCorners();
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virtual void SetBoundaries();
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void GetPhiUAtX(G4ThreeVector p, G4double& phi, G4double& u);
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G4ThreeVector ProjectPoint(const G4ThreeVector& p,
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G4bool isglobal = false);
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virtual G4ThreeVector SurfacePoint(G4double phi, G4double u,
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G4bool isGlobal = false);
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virtual G4double GetBoundaryMin(G4double phi);
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virtual G4double GetBoundaryMax(G4double phi);
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virtual G4double GetSurfaceArea();
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virtual void GetFacets( G4int m, G4int n, G4double xyz[][3],
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G4int faces[][4], G4int iside );
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inline G4double GetValueA(G4double phi);
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inline G4double GetValueB(G4double phi);
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inline G4ThreeVector NormAng(G4double phi, G4double u);
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inline G4double Xcoef(G4double u, G4double phi);
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// To calculate the w(u) function
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private:
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G4double fTheta;
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G4double fPhi ;
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G4double fDy1;
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G4double fDx1;
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G4double fDx2;
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G4double fDy2;
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G4double fDx3;
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G4double fDx4;
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G4double fDz; // Half-length along the z axis
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G4double fAlph;
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G4double fTAlph; // std::tan(fAlph)
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G4double fPhiTwist; // twist angle ( dphi in surface equation)
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G4double fAngleSide;
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G4double fdeltaX;
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G4double fdeltaY;
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G4double fDx4plus2; // fDx4 + fDx2 == a2/2 + a1/2
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G4double fDx4minus2; // fDx4 - fDx2 -
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G4double fDx3plus1; // fDx3 + fDx1 == d2/2 + d1/2
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G4double fDx3minus1; // fDx3 - fDx1 -
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G4double fDy2plus1; // fDy2 + fDy1 == b2/2 + b1/2
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G4double fDy2minus1; // fDy2 - fDy1 -
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G4double fa1md1; // 2 fDx2 - 2 fDx1 == a1 - d1
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G4double fa2md2; // 2 fDx4 - 2 fDx3
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};
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//========================================================
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// inline functions
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//========================================================
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inline
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G4double G4TwistBoxSide::GetValueA(G4double phi)
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{
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return ( fDx4plus2 + fDx4minus2 * ( 2 * phi ) / fPhiTwist ) ;
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}
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inline
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G4double G4TwistBoxSide::GetValueB(G4double phi)
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{
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return ( fDy2plus1 + fDy2minus1 * ( 2 * phi ) / fPhiTwist ) ;
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}
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inline
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G4double G4TwistBoxSide::Xcoef(G4double u, G4double phi)
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{
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return GetValueA(phi)/2. + u*fTAlph ;
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}
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inline G4ThreeVector
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G4TwistBoxSide::SurfacePoint( G4double phi, G4double u, G4bool isGlobal )
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{
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// function to calculate a point on the surface, given by parameters phi,u
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G4ThreeVector SurfPoint ( Xcoef(u,phi) * std::cos(phi)
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- u * std::sin(phi) + fdeltaX*phi/fPhiTwist,
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Xcoef(u,phi) * std::sin(phi)
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+ u * std::cos(phi) + fdeltaY*phi/fPhiTwist,
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2*fDz*phi/fPhiTwist );
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if (isGlobal) { return (fRot * SurfPoint + fTrans); }
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return SurfPoint;
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}
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inline
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G4double G4TwistBoxSide::GetBoundaryMin(G4double phi)
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{
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return -0.5*GetValueB(phi) ;
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}
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inline
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G4double G4TwistBoxSide::GetBoundaryMax(G4double phi)
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{
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return 0.5*GetValueB(phi) ;
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}
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inline
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G4double G4TwistBoxSide::GetSurfaceArea()
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{
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return (fDz*(std::sqrt(16*fDy1*fDy1
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+ (fa1md1 + 4*fDy1*fTAlph)*(fa1md1 + 4*fDy1*fTAlph))
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+ std::sqrt(16*fDy1*fDy1 + (fa2md2 + 4*fDy1*fTAlph)
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* (fa2md2 + 4*fDy1*fTAlph))))/2. ;
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}
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inline
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G4ThreeVector G4TwistBoxSide::NormAng( G4double phi, G4double u )
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{
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// function to calculate the norm at a given point on the surface
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// replace a1-d1
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G4ThreeVector nvec( 4*fDz*(std::cos(phi) + fTAlph*std::sin(phi)) ,
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4*fDz*(-(fTAlph*std::cos(phi)) + std::sin(phi)),
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(fDx2 + fDx4)*fPhiTwist*fTAlph
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+ 2*fDx4minus2*(-1 + fTAlph*phi)
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+ 2*fPhiTwist*(1 + fTAlph*fTAlph)*u
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- 2*(fdeltaX - fdeltaY*fTAlph)*std::cos(phi)
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- 2*(fdeltaY + fdeltaX*fTAlph)*std::sin(phi) );
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return nvec.unit();
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}
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#endif
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