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// $Id: G4Trap.icc,v 1.8 2006/10/19 15:33:37 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
// --------------------------------------------------------------------
// GEANT 4 inline definitions file
//
// G4Trap.icc
//
// Implementation of inline methods of G4Trap
// --------------------------------------------------------------------

inline
G4double G4Trap::GetZHalfLength() const
{
  return fDz ;
}

inline
G4ThreeVector G4Trap::GetSymAxis() const
{
  G4double cosTheta = 1.0/std::sqrt(1+fTthetaCphi*fTthetaCphi +
                               fTthetaSphi*fTthetaSphi) ;

  return G4ThreeVector(fTthetaCphi*cosTheta,
                       fTthetaSphi*cosTheta,
                       cosTheta) ;
}

inline
G4double G4Trap::GetYHalfLength1() const
{
  return fDy1 ;
}

inline
G4double G4Trap::GetXHalfLength1() const
{
  return fDx1 ;
}

inline
G4double G4Trap::GetXHalfLength2() const
{
  return fDx2 ;
}

inline
G4double G4Trap::GetTanAlpha1() const
{
  return fTalpha1 ;
}

inline
G4double G4Trap::GetYHalfLength2() const
{
  return fDy2 ;
}

inline
G4double G4Trap::GetXHalfLength3() const
{
  return fDx3 ;
}

inline
G4double G4Trap::GetXHalfLength4() const
{
  return fDx4 ;
}

inline
G4double G4Trap::GetTanAlpha2() const
{
  return fTalpha2 ;
}

inline
TrapSidePlane G4Trap::GetSidePlane( G4int n ) const
{
  return fPlanes[n] ;
}

inline
G4double G4Trap::GetFaceArea(const G4ThreeVector& p0, const G4ThreeVector& p1,
                             const G4ThreeVector& p2, const G4ThreeVector& p3)
{
   G4double area = 0.5*((p1-p0).cross(p2-p1).mag()+(p3-p2).cross(p0-p3).mag());
   return area;
}

inline
G4double G4Trap::GetCubicVolume()
{
  if(fCubicVolume != 0.) {;}
  else  { fCubicVolume = fDz*( (fDx1+fDx2+fDx3+fDx4)*(fDy1+fDy2)
                             + (fDx4+fDx3-fDx2-fDx1)*(fDy2-fDy1)/3 ); }
  return fCubicVolume;
}

inline
G4double G4Trap::GetSurfaceArea()
{
  if(fSurfaceArea != 0.) {;}
  else
  { 
    G4ThreeVector ba(fDx1-fDx2+fTalpha1*2*fDy1,2*fDy1,0);
    G4ThreeVector bc(2*fDz*fTthetaCphi-(fDx4-fDx2)+fTalpha2*fDy2-fTalpha1*fDy1,
                     2*fDz*fTthetaSphi+fDy2-fDy1, 2*fDz);
    G4ThreeVector dc(-fDx4+fDx3+2*fTalpha2*fDy2, 2*fDy2,0);
    G4ThreeVector da(-2*fDz*fTthetaCphi-(fDx1-fDx3)-fTalpha1*fDy1+fTalpha2*fDy2,
                     -2*fDz*fTthetaSphi-fDy1+fDy2,-2*fDz);

    G4ThreeVector ef(fDx2-fDx1+2*fTalpha1*fDy1, 2*fDy1,0);
    G4ThreeVector eh(2*fDz*fTthetaCphi+fDx3-fDx1+fTalpha1*fDy1-fTalpha2*fDy2,
                     2*fDz*fTthetaSphi-fDy2+fDy1,2*fDz);
    G4ThreeVector gh(fDx3-fDx4-2*fTalpha2*fDy2, -2*fDy2,0);
    G4ThreeVector gf(-2*fDz*fTthetaCphi+fDx2-fDx4+fTalpha1*fDy1-fTalpha2*fDy2,
                     -2*fDz*fTthetaSphi+fDy1-fDy2,-2*fDz);

    G4ThreeVector cr;
    cr = ba.cross(bc);
    G4double babc=cr.mag();
    cr = dc.cross(da);
    G4double dcda=cr.mag();
    cr = ef.cross(eh);
    G4double efeh=cr.mag();
    cr = gh.cross(gf);
    G4double ghgf=cr.mag();

    fSurfaceArea = 2*fDy1*(fDx1+fDx2)+2*fDy2*(fDx3+fDx4)
                 + (fDx1+fDx3)
                 * std::sqrt(4*fDz*fDz+std::pow(fDy2-fDy1-2*fDz*fTthetaSphi,2))
                 + (fDx2+fDx4)
                 * std::sqrt(4*fDz*fDz+std::pow(fDy2-fDy1+2*fDz*fTthetaSphi,2))
                 + 0.5*(babc+dcda+efeh+ghgf);
  }
  return fSurfaceArea;
}