Gabriele Cosmo
211 lines
7.5 KiB
C++
211 lines
7.5 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: G4TwistedTrapAlphaSide.hh,v 1.5 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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// G4TwistedTrapAlphaSide
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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 __G4TWISTEDTRAPALPHASIDE__
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#define __G4TWISTEDTRAPALPHASIDE__
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#include "G4VSurface.hh"
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#include <vector>
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class G4TwistedTrapAlphaSide : public G4VSurface
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{
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public: // with description
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G4TwistedTrapAlphaSide(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 ~G4TwistedTrapAlphaSide();
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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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inline G4double GetValueD(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 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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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 G4TwistedTrapAlphaSide::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 G4TwistedTrapAlphaSide::GetValueD(G4double phi)
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{
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return ( fDx3plus1 + fDx3minus1 * ( 2 * phi) / fPhiTwist ) ;
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}
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inline
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G4double G4TwistedTrapAlphaSide::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 G4TwistedTrapAlphaSide::Xcoef(G4double u, G4double phi)
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{
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return GetValueA(phi)/2. + (GetValueD(phi)-GetValueA(phi))/4.
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- u*( ( GetValueD(phi)-GetValueA(phi) ) / ( 2 * GetValueB(phi) ) + fTAlph ) ;
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}
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inline
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G4ThreeVector G4TwistedTrapAlphaSide::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 G4TwistedTrapAlphaSide::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( 16*fDy1*2*fDz*(4*fDy1*(std::cos(phi)-std::sin(phi)*fTAlph) + fa1md1*std::sin(phi)),
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16*fDy1*2*fDz*(4*fDy1*std::sin(phi) + std::cos(phi)*(-fa1md1 + 4*fDy1*fTAlph)),
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2*fDy1*(-16*fDy1*(fDx4minus2 + fDx3minus1) + 4*fDx2*fDx4plus2*fPhiTwist -
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(fDx4+fDx1)*4*fDx1*fPhiTwist + 2*fa1md1*fDx3*fPhiTwist -
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32*fDy1*fdeltaX + 8*fa1md1*fdeltaY +
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2*(-(fa1md1*(-2*(fDx4minus2 + fDx3minus1) - 4*fdeltaX)) + 16*fDy1*fdeltaY)*phi) +
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4*(16*fDy1*fDy1 + (fa1md1)*(fa1md1))*fPhiTwist*u -
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4*fDy1*fTAlph*(2*fDy1*(2*(fDx4plus2+fDx3plus1)*fPhiTwist
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+ 8*fdeltaY - 2*(-2*(fDx4minus2+fDx3minus1) - 4*fdeltaX)*phi)
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+ 8*(fa1md1)*fPhiTwist*u - 16*fDy1*fPhiTwist*u*fTAlph) ) ;
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return nvec.unit();
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}
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#endif
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