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EcalBarrelGeometry.cc

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#include "Geometry/EcalAlgo/interface/EcalBarrelGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"

#include <CLHEP/Geometry/Point3D.h>
#include <CLHEP/Geometry/Plane3D.h>
#include <CLHEP/Geometry/Vector3D.h>

#include <iomanip>
#include <iostream>

using namespace std;

EcalBarrelGeometry::EcalBarrelGeometry() :
   _nnxtalEta     ( 0 ) ,
   _nnxtalPhi     ( 0 ) ,
   _PhiBaskets    ( 0 ) ,
   m_borderMgr    ( 0 ),
   m_borderPtrVec ( 0 ) 
{
}


EcalBarrelGeometry::~EcalBarrelGeometry() 
{
   delete m_borderPtrVec ;
   delete m_borderMgr ;
}

// Get closest cell, etc...
DetId 
EcalBarrelGeometry::getClosestCell(const GlobalPoint& r) const 
{

  // z is the easy one
  int leverx = 1;
  int levery = 1;
  double pointz = r.z();
  int zbin=1;
  if(pointz<0)
    zbin=-1;

  // Now find the closest eta
  double pointeta = r.eta();
  //  double eta;
  double deta=999.;
  int etabin=1;
  
  int guessed_eta = (int)( fabs(pointeta) / 0.0174)+1;
  int guessed_eta_begin = guessed_eta-1;
  int guessed_eta_end   = guessed_eta+1;
  if (guessed_eta_begin < 1) guessed_eta_begin = 1;
  if (guessed_eta_end > 85) guessed_eta_end = 85;

    for(int bin=guessed_eta_begin; bin<= guessed_eta_end; bin++)
      {
        try
          {
            if (!present(EBDetId(zbin*bin,1,EBDetId::ETAPHIMODE)))
              continue;

            double eta = getGeometry(EBDetId(zbin*bin,1,EBDetId::ETAPHIMODE))->getPosition().eta();

            if(fabs(pointeta-eta)<deta)
              {
                deta=fabs(pointeta-eta);
                etabin=bin;
              }
            else break;
          }
        catch ( cms::Exception &e ) 
          {
          }
      }
    

  // Now the closest phi. always same number of phi bins(!?)
  const double twopi = M_PI+M_PI;

  // 10 degree tilt
  const double tilt=twopi/36.;
  double pointphi = r.phi()+tilt;

  // put phi in correct range (0->2pi)
  if(pointphi > twopi)
    pointphi -= twopi;
  if(pointphi < 0)
    pointphi += twopi;

  //calculate phi bin, distinguish + and - eta
  int phibin = static_cast<int>(pointphi / (twopi/_nnxtalPhi)) + 1;
  //   if(point.z()<0.0)
  //     {
  //       phibin = nxtalPhi/2 - 1 - phibin;
  //       if(phibin<0)
  //         phibin += nxtalPhi;
  //     }
  try
    {
      EBDetId myCell(zbin*etabin,phibin,EBDetId::ETAPHIMODE);

      if (!present(myCell))
        return DetId(0);
      
      HepPoint3D  A;
      HepPoint3D  B;
      HepPoint3D  C;
      HepPoint3D  point(r.x(),r.y(),r.z());

      // D.K. : equation of plane : AA*x+BB*y+CC*z+DD=0;
      // finding equation for each edge

      // Since the point can lie between crystals, it is necessary to keep track of the movements
      // to avoid infinite loops
      std::vector<double> history;
      history.resize(4,0.);
      //
      // stop movement in eta direction when closest cell was found (point between crystals)
      int start = 1;
      int counter = 0;
      // Moving until find closest crystal in eta and phi directions (leverx and levery)
      while  (leverx==1 || levery == 1)
        {
          leverx = 0;
          levery = 0;
          const CaloCellGeometry::CornersVec& corners 
             ( getGeometry(myCell)->getCorners() ) ;
          std::vector<double> SS;

          // compute the distance of the point with respect of the 4 crystal lateral planes
          for (short i=0; i < 4 ; ++i)
            {
              A = HepPoint3D(corners[i%4].x(),corners[i%4].y(),corners[i%4].z());
              B = HepPoint3D(corners[(i+1)%4].x(),corners[(i+1)%4].y(),corners[(i+1)%4].z());
              C = HepPoint3D(corners[4+(i+1)%4].x(),corners[4+(i+1)%4].y(),corners[4+(i+1)%4].z());
              HepPlane3D plane(A,B,C);
              plane.normalize();
              double distance = plane.distance(point);
              if(plane.d()>0.) distance=-distance;
              if (corners[0].z()<0.) distance=-distance;
              SS.push_back(distance);
            }

          // SS's - normals
          // check position of the point with respect to opposite side of crystal
          // if SS's have opposite sign, the  point lies inside that crystal

          if ( ( SS[0]>0.&&SS[2]>0. )||( SS[0]<0.&&SS[2]<0. ) )
            {
              levery = 1;
              if ( history[0]>0. && history[2]>0. && SS[0]<0 && SS[2]<0 &&
                   (abs(SS[0])+abs(SS[2]))> (abs(history[0])+abs(history[2]))) levery = 0  ;
              if ( history[0]<0. && history[2]<0. && SS[0]>0 && SS[2]>0 &&
                   (abs(SS[0])+abs(SS[2]))> (abs(history[0])+abs(history[2]))) levery = 0  ;


              if (SS[0]>0. )
                {
                  EBDetId nextPoint;
                  if (myCell.iphi()==EBDetId::MIN_IPHI) 
                    nextPoint=EBDetId(myCell.ieta(),EBDetId::MAX_IPHI);
                  else 
                    nextPoint=EBDetId(myCell.ieta(),myCell.iphi()-1);
                  if (present(nextPoint))
                    myCell=nextPoint;
                  else
                    levery=0;             
                }
              else
                {
                  EBDetId nextPoint;
                  if (myCell.iphi()==EBDetId::MAX_IPHI)
                    nextPoint=EBDetId(myCell.ieta(),EBDetId::MIN_IPHI);
                  else
                    nextPoint=EBDetId(myCell.ieta(),myCell.iphi()+1);
                  if (present(nextPoint))
                    myCell=nextPoint;
                  else
                    levery=0;
                }
            }


          if ( ( ( SS[1]>0.&&SS[3]>0. )||( SS[1]<0.&&SS[3]<0. )) && start==1  )
            {
              leverx = 1;

              if ( history[1]>0. && history[3]>0. && SS[1]<0 && SS[3]<0 &&
                   (abs(SS[1])+abs(SS[3]))> (abs(history[1])+abs(history[3])) )
                {
                  leverx = 0;
                  start = 0;
                }

              if ( history[1]<0. && history[3]<0. && SS[1]>0 && SS[3]>0 &&
                   (abs(SS[1])+abs(SS[3]))> (abs(history[1])+abs(history[3])) )
                {
                  leverx = 0;
                  start = 0;
                }


              if (SS[1]>0.)
                {
                  EBDetId nextPoint;
                  if (myCell.ieta()==-1) 
                    nextPoint=EBDetId (1,myCell.iphi());
                  else 
                    {
                      int nieta= myCell.ieta()+1;
                      if(nieta==86) nieta=85;
                      nextPoint=EBDetId(nieta,myCell.iphi());
                    }
                  if (present(nextPoint))
                    myCell = nextPoint;
                  else
                    leverx = 0;
                }
              else
                {
                  EBDetId nextPoint;
                  if (myCell.ieta()==1) 
                    nextPoint=EBDetId(-1,myCell.iphi());
                  else 
                    {
                      int nieta=myCell.ieta()-1;
                      if(nieta==-86) nieta=-85;
                      nextPoint=EBDetId(nieta,myCell.iphi());
                    }
                  if (present(nextPoint))
                    myCell = nextPoint;
                  else
                    leverx = 0;
                }
            }
          
          // Update the history. If the point lies between crystals, the closest one
          // is returned
          history =SS;
          
          counter++;
          if (counter == 10)
            {
              leverx=0;
              levery=0;
            }
        }
      // D.K. if point lies netween cells, take a closest cell.
      return DetId(myCell);
    }
  catch ( cms::Exception &e ) 
    { 
      return DetId(0);
    }

}

CaloSubdetectorGeometry::DetIdSet 
EcalBarrelGeometry::getCells( const GlobalPoint& r, 
                              double             dR ) const 
{
   static const int maxphi ( EBDetId::MAX_IPHI ) ;
   static const int maxeta ( EBDetId::MAX_IETA ) ;
   CaloSubdetectorGeometry::DetIdSet dis;  // this is the return object

   if( 0.000001 < dR )
   {
      if( dR > M_PI/2. ) // this version needs "small" dR
      {
         dis = CaloSubdetectorGeometry::getCells( r, dR ) ; // base class version
      }
      else
      {
         const double dR2     ( dR*dR ) ;
         const double reta    ( r.eta() ) ;
         const double rz      ( r.z()   ) ;
         const double rphi    ( r.phi() ) ;
         const double lowEta  ( reta - dR ) ;
         const double highEta ( reta + dR ) ;
         
         if( highEta > -1.5 &&
             lowEta  <  1.5    ) // in barrel
         {
            const double scale       ( maxphi/(2*M_PI) ) ; // angle to index
            const int    ieta_center ( int( reta*scale + ((rz<0)?(-1):(1))) ) ;
            const double phi         ( rphi<0 ? rphi + 2*M_PI : rphi ) ;
            const int    iphi_center ( int( phi*scale + 11. ) ) ; // phi=-9.4deg is iphi=1

            const double fr    ( dR*scale    ) ; // # crystal widths in dR
            const double frp   ( 1.05*fr + 1. ) ; // conservatively above fr 
            const double frm   ( 0.95*fr - 1. ) ; // conservatively below fr
            const int    idr   ( frp         ) ; // integerize
            const int    idr2p ( frp*frp     ) ;
            const int    idr2m ( frm > 0 ? int(frm*frm) : 0 ) ;

            for( int de ( -idr ) ; de <= idr ; ++de ) // over eta limits
            {
               int ieta ( de + ieta_center ) ;
               
               if( abs(ieta) <= maxeta &&
                   ieta      != 0         ) // eta is in EB
               {
                  const int de2 ( de*de ) ;
                  for( int dp ( -idr ) ; dp <= idr ; ++dp )  // over phi limits
                  {
                     const int irange2 ( dp*dp + de2 ) ;
                     
                     if( irange2 <= idr2p ) // cut off corners that must be too far away
                     {
                        const int iphi ( ( iphi_center + dp + maxphi - 1 )%maxphi + 1 ) ;
                        
                        if( iphi != 0 )
                        {
                           const EBDetId id ( ieta, iphi ) ;
                           
                           bool ok ( irange2 < idr2m ) ;  // no more calculation necessary if inside this radius
                           
                           if( !ok ) // if not ok, then we have to test this cell for being inside cone
                           {
                              const CaloCellGeometry* cell ( getGeometry( id ) );
                              if( 0 != cell )
                              {
                                 const GlobalPoint& p   ( cell->getPosition() ) ;
                                 const double       eta ( p.eta() ) ;
                                 const double       phi ( p.phi() ) ;
                                 ok = ( reco::deltaR2( eta, phi, reta, rphi ) < dR2 ) ;
                              }
                           }
                           if( ok ) dis.insert( id ) ;
                        }
                     }
                  }
               }
            }
         }
      }
   }
   return dis;
}

const EcalBarrelGeometry::OrderedListOfEEDetId* 
EcalBarrelGeometry::getClosestEndcapCells( EBDetId id ) const
{
   OrderedListOfEEDetId* ptr ( 0 ) ;
   if( 0 != id.rawId() )
   {
      const int iPhi     ( id.iphi() ) ;

      const int iz       ( id.ieta()>0 ? 1 : -1 ) ;
      const EEDetId eeid ( EEDetId::idOuterRing( iPhi, iz ) ) ;

      const int ix ( eeid.ix() ) ;
      const int iy ( eeid.iy() ) ;

      const int iq ( eeid.iquadrant() ) ;
      const int xout ( 1==iq || 4==iq ? 1 : -1 ) ;
      const int yout ( 1==iq || 2==iq ? 1 : -1 ) ;
      if( 0 == m_borderMgr )
      {
         m_borderMgr = new EZMgrFL<EEDetId>( 720*9, 9 ) ;
      }
      if( 0 == m_borderPtrVec )
      {
         m_borderPtrVec = new VecOrdListEEDetIdPtr() ;
         m_borderPtrVec->reserve( 720 ) ;
         for( unsigned int i ( 0 ) ; i != 720 ; ++i )
         {
            const int kz ( 360>i ? -1 : 1 ) ;
            const EEDetId eeid ( EEDetId::idOuterRing( i%360+1, kz ) ) ;

            const int jx ( eeid.ix() ) ;
            const int jy ( eeid.iy() ) ;

            OrderedListOfEEDetId& olist ( *new OrderedListOfEEDetId( m_borderMgr ) );
            int il ( 0 ) ;

            for( unsigned int k ( 1 ) ; k <= 25 ; ++k )
            {
               const int kx ( 1==k || 2==k || 3==k || 12==k || 13==k ? 0 :
                              ( 4==k || 6==k || 8==k || 15==k || 20==k ? 1 :
                                ( 5==k || 7==k || 9==k || 16==k || 19==k ? -1 :
                                  ( 10==k || 14==k || 21==k || 22==k || 25==k ? 2 : -2 )))) ;
               const int ky ( 1==k || 4==k || 5==k || 10==k || 11==k ? 0 :
                              ( 2==k || 6==k || 7==k || 14==k || 17==k ? 1 :
                                ( 3==k || 8==k || 9==k || 18==k || 21==k ? -1 :
                                  ( 12==k || 15==k || 16==k || 22==k || 23==k ? 2 : -2 )))) ;

               if( 8>=il && EEDetId::validDetId( jx + kx*xout ,
                                                 jy + ky*yout , kz ) ) 
               {
                  olist[il++]=EEDetId( jx + kx*xout ,
                                       jy + ky*yout , kz ) ;
               }
            }
            m_borderPtrVec->push_back( &olist ) ;
         }
      }
      ptr = (*m_borderPtrVec)[ iPhi - 1 + ( 0>iz ? 0 : 360 ) ] ;
   }
   return ptr ;
}

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