Gabriele Cosmo
204 lines
6.8 KiB
C++
204 lines
6.8 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: G4TwistedTrapParallelSide.hh,v 1.3 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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// G4TwistedTrapParallelSide
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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 __G4TWISTEDTRAPPARALLELSIDE__
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#define __G4TWISTEDTRAPPARALLELSIDE__
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#include "G4VSurface.hh"
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#include <vector>
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class G4TwistedTrapParallelSide : public G4VSurface
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{
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public: // with description
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G4TwistedTrapParallelSide(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 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 ~G4TwistedTrapParallelSide();
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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); // to calculate the w(u) function
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inline G4double GetValueB(G4double phi) ;
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inline G4double GetUmin(G4double phi) ;
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inline G4double GetUmax(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 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 fa1md1 ; // 2 fDx2 - 2 fDx1 == a1 - d1
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G4double fa2md2 ; // 2 fDx4 - 2 fDx3
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G4double fdeltaX ;
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G4double fdeltaY ;
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G4double fDy2plus1 ; // fDy2 + fDy1 == b2/2 + b1/2
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G4double fDy2minus1 ; // fDy2 - fDy1 -
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// temporary
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G4double fDy ;
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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 G4TwistedTrapParallelSide::GetUmin(G4double phi)
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{
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return ( - (2*fDx2*(fPhiTwist - 2*phi) + 2*fDx4*(fPhiTwist + 2*phi) + (2*fDy1*(fPhiTwist - 2*phi) + 2*fDy2*(fPhiTwist + 2*phi))*fTAlph)/(4.*fPhiTwist) ) ;
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}
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inline
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G4double G4TwistedTrapParallelSide::GetUmax(G4double phi)
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{
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return (2*fDx2*(fPhiTwist - 2*phi) + 2*fDx4*(fPhiTwist + 2*phi) - (2*fDy1*(fPhiTwist - 2*phi) + 2*fDy2*(fPhiTwist + 2*phi))*fTAlph)/(4.*fPhiTwist) ;
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}
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inline
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G4double G4TwistedTrapParallelSide::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 G4TwistedTrapParallelSide::Xcoef(G4double phi)
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{
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return GetValueB(phi)/2. ;
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}
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inline
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G4ThreeVector G4TwistedTrapParallelSide::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 ( ( u + fdeltaX*phi/fPhiTwist ) * std::cos(phi)
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- ( Xcoef(phi) + fdeltaY*phi/fPhiTwist ) * std::sin(phi),
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( u + fdeltaX*phi/fPhiTwist ) * std::sin(phi)
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+ ( Xcoef(phi) + 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 G4TwistedTrapParallelSide::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(
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-2*fDz*std::sin(phi),
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2*fDz*std::cos(phi),
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fDy1 - fDy2 - fdeltaY - fdeltaX*phi - fPhiTwist*u
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) ;
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return nvec.unit();
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}
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#endif
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