/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/Geometry/EcalAlgo/src/EcalPreshowerGeometry.cc

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#include "Geometry/CaloGeometry/interface/PreshowerStrip.h"
#include "Geometry/CaloGeometry/interface/CaloGenericDetId.h"
#include "Geometry/EcalAlgo/interface/EcalPreshowerGeometry.h"
#include "DataFormats/EcalDetId/interface/ESDetId.h"
#include "FWCore/Utilities/interface/Exception.h"
#include <iostream>

typedef CaloCellGeometry::CCGFloat CCGFloat ;
typedef CaloCellGeometry::Pt3D     Pt3D     ;
typedef CaloCellGeometry::Pt3DVec  Pt3DVec  ;
typedef HepGeom::Plane3D<CCGFloat> Pl3D     ;

EcalPreshowerGeometry::EcalPreshowerGeometry() :
   m_xWidWaf      ( 6.3  ) ,
   m_xInterLadGap ( 0.05 ) , // additional gap between wafers in adj ladders
   m_xIntraLadGap ( 0.04 ) , // gap between wafers in same ladder
   m_yWidAct      ( 6.1  ) ,
   m_yCtrOff      ( 0.05 ) ,  // gap at center
   m_cellVec      ( k_NumberOfCellsForCorners )
{
  m_zplane[0] = 0. ;
  m_zplane[1] = 0. ;
  m_zplane[2] = 0. ;
  m_zplane[3] = 0. ;
}


EcalPreshowerGeometry::~EcalPreshowerGeometry()
{
}

unsigned int
EcalPreshowerGeometry::alignmentTransformIndexLocal( const DetId& id )
{
   const CaloGenericDetId gid ( id ) ;

   assert( gid.isES() ) ;

// plane 2 is split into 2 dees along x=0 for both signs of z

// plane 1 at zsign=-1 is split into 2 dees between six=19 and six=20 for siy<=20,
//                                             and six=21 and 22 for siy>=21

// plane 1 at zsign=+1 is split into 2 dees between six=20 and six=21 for siy<=20,
//                                             and six=19 and 20 for siy>=21


// Desired numbering 
//                LEFT    RIGHT (as one faces the Dee from the IP)
//  ES-  pl=2     0       1
//       pl=1     2       3    the reversal of pl=2 and pl=1 is intentional here (CM Kuo)
//  ES+  pl=1     4       5
//       pl=2     6       7

   const ESDetId esid ( id ) ;
   const int jx ( esid.six() - 1 ) ;
   const int jy ( esid.siy() - 1 ) ;
   const int jz ( esid.zside() + 1 ) ;
   const int pl ( esid.plane() - 1 ) ;
   const bool second ( 1 == pl ) ;
   const bool top   ( 19 < jy ) ;
   const bool negz  ( 0 == jz ) ;
   const int lrl    ( 19>jx ? 0 : 1 ) ;
   const int lrr    ( 21>jx ? 0 : 1 ) ;

   return ( second ? jx/20 + 3*jz :  // 2nd plane split along middle
            ( negz && !top ? lrl + 2 :  // 1st plane at neg z and bottom half split at six=19&20
              ( negz && top ? lrr + 2 : // 1st plane at neg z and top half split at six=21&22
                ( !negz && !top ? lrr + 4 : lrl + 4 ) ) ) ) ; // opposite at positive z
}

DetId 
EcalPreshowerGeometry::detIdFromLocalAlignmentIndex( unsigned int iLoc )
{
   return ESDetId( 1, 10 + 20*( iLoc%2 ), 10, 2>iLoc || 5<iLoc ? 2 : 1, 2*( iLoc/4 ) - 1 ) ;
}

unsigned int
EcalPreshowerGeometry::alignmentTransformIndexGlobal( const DetId& /*id*/ )
{
   return (unsigned int)DetId::Ecal - 1 ;
}


void 
EcalPreshowerGeometry::initializeParms() 
{
   unsigned int n1minus ( 0 ) ;
   unsigned int n2minus ( 0 ) ;
   unsigned int n1plus ( 0 ) ;
   unsigned int n2plus ( 0 ) ;
   CCGFloat z1minus ( 0 ) ;
   CCGFloat z2minus ( 0 ) ;
   CCGFloat z1plus ( 0 ) ;
   CCGFloat z2plus ( 0 ) ;
   const std::vector<DetId>& esDetIds ( getValidDetIds() ) ;

   for( unsigned int i ( 0 ) ; i != esDetIds.size() ; ++i )
   {
      const ESDetId esid ( esDetIds[i] ) ;
      const CaloCellGeometry* cell ( getGeometry( esid ) ) ;
      if( 0 != cell )
      {
         const CCGFloat zz ( cell->getPosition().z() ) ; 
         if( 1 == esid.plane() )
         {
            if( 0 > esid.zside() )
            {
               z1minus += zz ;
               ++n1minus ;
            }
            else
            {
               z1plus += zz ;
               ++n1plus ;
            }
         }
         if( 2 == esid.plane() )
         {
            if( 0 > esid.zside() )
            {
               z2minus += zz ;
               ++n2minus ;
            }
            else
            {
               z2plus += zz ;
               ++n2plus ;
            }
         }
      }
   }
   assert( 0 != n1minus &&
           0 != n2minus &&
           0 != n1plus  &&
           0 != n2plus     ) ;
   z1minus /= (1.*n1minus) ;
   z2minus /= (1.*n2minus) ;
   z1plus /= (1.*n1plus) ;
   z2plus /= (1.*n2plus) ;
   assert( 0 != z1minus &&
           0 != z2minus &&
           0 != z1plus  &&
           0 != z2plus     ) ;
   setzPlanes( z1minus, z2minus, z1plus, z2plus ) ;
}


void 
EcalPreshowerGeometry::setzPlanes( CCGFloat z1minus, 
                                   CCGFloat z2minus,
                                   CCGFloat z1plus, 
                                   CCGFloat z2plus ) 
{
   assert( 0 > z1minus &&
           0 > z2minus &&
           0 < z1plus  &&
           0 < z2plus     ) ;

   m_zplane[0] = z1minus ;
   m_zplane[1] = z2minus ;
   m_zplane[2] = z1plus ;
   m_zplane[3] = z2plus ;
}


// Get closest cell, etc...
DetId 
EcalPreshowerGeometry::getClosestCell( const GlobalPoint& point ) const
{
  return getClosestCellInPlane( point, 2 );
} 

DetId 
EcalPreshowerGeometry::getClosestCellInPlane( const GlobalPoint& point,
                                              int                plane          ) const
{
   const CCGFloat x ( point.x() ) ;
   const CCGFloat y ( point.y() ) ;
   const CCGFloat z ( point.z() ) ;

   if( 0 == z    ||
       1 > plane ||
       2 < plane    ) return DetId( 0 ) ;

   const unsigned int iz ( ( 0>z ? 0 : 2 ) + plane - 1 ) ;

   const CCGFloat ze ( m_zplane[iz] ) ;
   const CCGFloat xe ( x * ze/z ) ;
   const CCGFloat ye ( y * ze/z ) ;

   const CCGFloat x0 ( 1 == plane ? xe : ye ) ;
   const CCGFloat y0 ( 1 == plane ? ye : xe ) ;

   static const CCGFloat xWid ( m_xWidWaf + m_xIntraLadGap + m_xInterLadGap ) ;

   const int row ( 1 + int( y0 + 20.*m_yWidAct - m_yCtrOff )/m_yWidAct ) ;
   const int col ( 1 + int( ( x0 + 20.*xWid )/xWid ) ) ;

   CCGFloat closest ( 1e9 ) ; 

   DetId detId ( 0 ) ;

   const int jz ( 0 > ze ? -1 : 1 ) ;


//   std::cout<<"** p="<<point<<", ("<<xe<<", "<<ye<<", "<<ze<<"), row="<<row<<", col="<<col<<std::endl;

   for( int ix ( -1 ); ix != 2 ; ++ix ) // search within +-1 in row and col
   {
      for( int iy ( -1 ); iy != 2 ; ++iy )
      {
         for( int jstrip ( ESDetId::ISTRIP_MIN ) ; jstrip <= ESDetId::ISTRIP_MAX ; ++jstrip )
         {
            const int jx ( 1 == plane ? col + ix : row + iy ) ;
            const int jy ( 1 == plane ? row + iy : col + ix ) ;
            if( ESDetId::validDetId( jstrip, jx, jy, plane, jz ) )
            {
               const ESDetId esId ( jstrip, jx, jy, plane, jz ) ;
               const CaloCellGeometry* cell ( getGeometry( esId ) ) ;
               if( 0 != cell )
               {
                  const GlobalPoint& p ( cell->getPosition() ) ;
                  const CCGFloat dist2 ( (p.x()-xe)*(p.x()-xe) + (p.y()-ye)*(p.y()-ye) ) ;
                  if( dist2 < closest && present( esId ) )
                  {
                     closest = dist2 ;
                     detId   = esId  ;
                  }
               }
            }
         }
      }
   }
   return detId ;
}

void
EcalPreshowerGeometry::localCorners( Pt3DVec&        lc  ,
                                     const CCGFloat* pv  ,
                                     unsigned int    /*i*/   ,
                                     Pt3D&           ref   )
{
   PreshowerStrip::localCorners( lc, pv, ref ) ;
}

void
EcalPreshowerGeometry::newCell( const GlobalPoint& f1 ,
                                const GlobalPoint& /*f2*/ ,
                                const GlobalPoint& /*f3*/ ,
                                const CCGFloat*    parm ,
                                const DetId&       detId    ) 
{
   const unsigned int cellIndex ( ESDetId( detId ).denseIndex() ) ;
   m_cellVec[ cellIndex ] = PreshowerStrip( f1, cornersMgr(), parm ) ;
   m_validIds.push_back( detId ) ;
}

const CaloCellGeometry* 
EcalPreshowerGeometry::cellGeomPtr( uint32_t index ) const
{
   const CaloCellGeometry* cell ( &m_cellVec[ index ] ) ;
   return ( m_cellVec.size() < index ||
            0 == cell->param() ? 0 : cell ) ;
}