Gabriele Cosmo
184 lines
6.2 KiB
C++
184 lines
6.2 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4TwistedTrapBoxSide.hh,v 1.2 2005/03/18 17:11:53 gcosmo Exp $
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//
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// --------------------------------------------------------------------
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// GEANT 4 class header file
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//
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//
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// G4TwistedTrapBoxSide
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//
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// Class description:
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//
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// Class describing a twisted boundary surface for a trapezoid.
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// Author:
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//
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// Oliver Link (Oliver.Link@cern.ch)
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//
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// --------------------------------------------------------------------
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#ifndef __G4TWISTEDTRAPBOXSIDE__
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#define __G4TWISTEDTRAPBOXASIDE__
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#include "G4VSurface.hh"
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#include <vector>
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class G4TwistedTrapBoxSide : public G4VSurface
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{
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public: // with description
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G4TwistedTrapBoxSide(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, // defined 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 pDy2, // half y length at +pDz
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G4double pDx2, // 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 ~G4TwistedTrapBoxSide();
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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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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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inline G4ThreeVector SurfacePoint(G4double phi, G4double u);
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inline G4ThreeVector NormAng(G4double phi, G4double u);
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inline G4double Xcoef(G4double u,G4double phi); // to calculate the w(u) function
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inline G4double GetValueA(G4double phi) ;
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inline G4double GetValueB(G4double phi) ;
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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 fDy2;
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G4double fDx1;
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G4double fDx2;
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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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};
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//========================================================
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// inline functions
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//========================================================
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inline
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G4double G4TwistedTrapBoxSide::GetValueA(G4double phi)
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{
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return ( fDx1 + fDx2 - (2*(fDx1 - fDx2)*phi)/fPhiTwist ) ;
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}
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inline
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G4double G4TwistedTrapBoxSide::GetValueB(G4double phi)
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{
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return ( fDy1 + fDy2 - (2*(fDy1 - fDy2)*phi)/fPhiTwist ) ;
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}
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inline
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G4double G4TwistedTrapBoxSide::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
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G4ThreeVector G4TwistedTrapBoxSide::SurfacePoint( G4double phi, G4double u )
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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) + fdeltaX*phi/fPhiTwist ) * std::cos(phi)
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- ( u + fdeltaY*phi/fPhiTwist ) * std::sin(phi),
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( Xcoef(u,phi) + fdeltaX*phi/fPhiTwist ) * std::sin(phi)
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+ ( u + fdeltaY*phi/fPhiTwist ) * std::cos(phi),
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2*fDz*phi/fPhiTwist );
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return SurfPoint ;
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}
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inline
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G4ThreeVector G4TwistedTrapBoxSide::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
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nvec(
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8*fDz*(std::cos(phi) - fTAlph*std::sin(phi)),
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8*fDz*(fTAlph*std::cos(phi) + std::sin(phi)),
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2*fDx1*(2 - fTAlph*(fPhiTwist - 2*phi)) - 2*fDx2*(2 + fTAlph*(fPhiTwist + 2*phi))
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- 4*(fdeltaX + fdeltaY*(fTAlph - phi) + fdeltaX*fTAlph*phi) + 4*fPhiTwist*(1 + fTAlph*fTAlph)*u) ;
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return nvec.unit();
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}
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#endif
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