/data/refman/pasoursint/CMSSW_6_1_1/src/Geometry/CaloGeometry/src/IdealZPrism.cc

Go to the documentation of this file.

#include "Geometry/CaloGeometry/interface/IdealZPrism.h"
#include <math.h>

typedef IdealZPrism::CCGFloat CCGFloat ;
typedef IdealZPrism::Pt3D     Pt3D     ;
typedef IdealZPrism::Pt3DVec  Pt3DVec  ;

IdealZPrism::IdealZPrism()
  : CaloCellGeometry()
{}

IdealZPrism::IdealZPrism( const IdealZPrism& idzp ) 
  : CaloCellGeometry( idzp )
{
  *this = idzp ;
}

IdealZPrism& 
IdealZPrism::operator=( const IdealZPrism& idzp ) 
{
  if( &idzp != this ) CaloCellGeometry::operator=( idzp ) ;
  return *this ;
}

IdealZPrism::IdealZPrism( const GlobalPoint& faceCenter , 
                          const CornersMgr*  mgr        ,
                          const CCGFloat*    parm         )
  : CaloCellGeometry ( faceCenter, mgr, parm )   
{}

IdealZPrism::~IdealZPrism() 
{}

CCGFloat 
IdealZPrism::dEta() const 
{
   return param()[0] ;
}

CCGFloat 
IdealZPrism::dPhi() const 
{ 
   return param()[1] ;
}

CCGFloat 
IdealZPrism::dz()   const 
{ 
   return param()[2] ;
}

CCGFloat 
IdealZPrism::eta()  const 
{
   return param()[3] ; 
}

CCGFloat 
IdealZPrism::z()    const 
{ 
   return param()[4] ;
}

void 
IdealZPrism::vocalCorners( Pt3DVec&        vec ,
                           const CCGFloat* pv  ,
                           Pt3D&           ref   ) const 
{ 
   localCorners( vec, pv, ref ) ; 
}

GlobalPoint 
IdealZPrism::etaPhiR( float eta ,
                      float phi ,
                      float rad   ) 
{
   return GlobalPoint( rad*cosf(  phi )/coshf( eta ) ,
                       rad*sinf(  phi )/coshf( eta ) ,
                       rad*tanhf( eta )             ) ;
}

GlobalPoint 
IdealZPrism::etaPhiPerp( float eta , 
                         float phi , 
                         float perp  ) 
{
   return GlobalPoint( perp*cosf(  phi ) , 
                       perp*sinf(  phi ) , 
                       perp*sinhf( eta ) );
}

GlobalPoint 
IdealZPrism::etaPhiZ( float eta , 
                      float phi ,
                      float z    ) 
{
   return GlobalPoint( z*cosf( phi )/sinhf( eta ) ,
                       z*sinf( phi )/sinhf( eta ) ,
                       z                            ) ;
}

void
IdealZPrism::localCorners( Pt3DVec&        lc  ,
                           const CCGFloat* pv  ,
                           Pt3D&           ref   )
{
   assert( 8 == lc.size() ) ;
   if( false )
   {
      GlobalPoint g1 ( etaPhiR(0,0,0) ) ;
      GlobalPoint g2 ( etaPhiPerp(0,0,0) ) ;
   }
   assert( 0 != pv ) ;
   
   const CCGFloat dEta ( pv[0] ) ;
   const CCGFloat dPhi ( pv[1] ) ;
   const CCGFloat dz   ( pv[2] ) ;
   const CCGFloat eta  ( pv[3] ) ;
   const CCGFloat z    ( pv[4] ) ;
   
   std::vector<GlobalPoint> gc ( 8, GlobalPoint(0,0,0) ) ;
   
   const GlobalPoint p ( etaPhiZ( eta, 0, z ) ) ;
   
   const float z_near ( z ) ;
   const float z_far  ( z*( 1 - 2*dz/p.mag() ) ) ;
   gc[ 0 ] = etaPhiZ( eta + dEta , +dPhi , z_near ) ; // (+,+,near)
   gc[ 1 ] = etaPhiZ( eta + dEta , -dPhi , z_near ) ; // (+,-,near)
   gc[ 2 ] = etaPhiZ( eta - dEta , -dPhi , z_near ) ; // (-,-,near)
   gc[ 3 ] = etaPhiZ( eta - dEta , +dPhi , z_near ) ; // (-,+,far)
   gc[ 4 ] = GlobalPoint( gc[0].x(), gc[0].y(), z_far ); // (+,+,far)
   gc[ 5 ] = GlobalPoint( gc[1].x(), gc[1].y(), z_far ); // (+,-,far)
   gc[ 6 ] = GlobalPoint( gc[2].x(), gc[2].y(), z_far ); // (-,-,far)
   gc[ 7 ] = GlobalPoint( gc[3].x(), gc[3].y(), z_far ); // (-,+,far)   
   
   for( unsigned int i ( 0 ) ; i != 8 ; ++i )
   {
      lc[i] = Pt3D( gc[i].x(), gc[i].y(), gc[i].z() ) ;
   }
   
   ref   = 0.25*( lc[0] + lc[1] + lc[2] + lc[3] ) ;
}

const CaloCellGeometry::CornersVec& 
IdealZPrism::getCorners() const 
{
   const CornersVec& co ( CaloCellGeometry::getCorners() ) ;
   if( co.uninitialized() ) 
   {
      CornersVec& corners ( setCorners() ) ;
      
      const GlobalPoint p      ( getPosition() ) ;
      const CCGFloat    z_near ( p.z() ) ;
      const CCGFloat    z_far  ( z_near + 2*dz()*p.z()/fabs( p.z() ) ) ;
      const CCGFloat    eta    ( p.eta() ) ;
      const CCGFloat    phi    ( p.phi() ) ;
      
      corners[ 0 ] = etaPhiZ( eta + dEta(), phi + dPhi(), z_near ); // (+,+,near)
      corners[ 1 ] = etaPhiZ( eta + dEta(), phi - dPhi(), z_near ); // (+,-,near)
      corners[ 2 ] = etaPhiZ( eta - dEta(), phi - dPhi(), z_near ); // (-,-,near)
      corners[ 3 ] = etaPhiZ( eta - dEta(), phi + dPhi(), z_near ); // (-,+,near)
      corners[ 4 ] = GlobalPoint( corners[0].x(), corners[0].y(), z_far ); // (+,+,far)
      corners[ 5 ] = GlobalPoint( corners[1].x(), corners[1].y(), z_far ); // (+,-,far)
      corners[ 6 ] = GlobalPoint( corners[2].x(), corners[2].y(), z_far ); // (-,-,far)
      corners[ 7 ] = GlobalPoint( corners[3].x(), corners[3].y(), z_far ); // (-,+,far) 
   }
   return co ;
}

std::ostream& operator<<( std::ostream& s, const IdealZPrism& cell ) 
{
   s << "Center: " <<  cell.getPosition() << std::endl ;
   s << "dEta = " << cell.dEta() << ", dPhi = " << cell.dPhi() << ", dz = " << cell.dz() << std::endl ;
   return s;
}