FastTSGFromPropagation.cc

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#include "FastSimulation/Muons/plugins/FastTSGFromPropagation.h"

#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "TrackingTools/MeasurementDet/interface/LayerMeasurements.h"
#include "TrackingTools/MeasurementDet/interface/MeasurementDet.h"
#include "TrackingTools/KalmanUpdators/interface/Chi2MeasurementEstimator.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/GeomPropagators/interface/StateOnTrackerBound.h"

#include "RecoTracker/Record/interface/TrackerRecoGeometryRecord.h"
#include "RecoTracker/Record/interface/CkfComponentsRecord.h"
// #include "RecoTracker/MeasurementDet/interface/TkStripMeasurementDet.h"
#include "RecoTracker/MeasurementDet/interface/MeasurementTracker.h"
#include "RecoTracker/MeasurementDet/interface/MeasurementTrackerEvent.h"
#include "RecoTracker/TkDetLayers/interface/GeometricSearchTracker.h"

#include "RecoMuon/GlobalTrackingTools/interface/DirectTrackerNavigation.h"
#include "TrackingTools/KalmanUpdators/interface/KFUpdator.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CommonTools/UtilAlgos/interface/TFileService.h"

#include "SimDataFormats/Track/interface/SimTrackContainer.h"
#include "DataFormats/TrackerRecHit2D/interface/SiTrackerGSRecHit2DCollection.h"
#include "DataFormats/TrackerRecHit2D/interface/SiTrackerGSMatchedRecHit2DCollection.h"
#include "FastSimulation/Tracking/interface/TrajectorySeedHitCandidate.h"
#include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/CommonDetUnit/interface/GeomDetUnit.h"
#include "FastSimulation/Tracking/plugins/TrajectorySeedProducer.h"
#include "TrackingTools/TransientTrackingRecHit/interface/GenericTransientTrackingRecHit.h"
#include "TrackingTools/Records/interface/TransientRecHitRecord.h"
#include "DataFormats/TrackerCommon/interface/TrackerTopology.h"

using namespace std;


FastTSGFromPropagation::FastTSGFromPropagation(const edm::ParameterSet & iConfig,edm::ConsumesCollector& iC) :theTkLayerMeasurements(), theTracker(0), theNavigation(0), theService(0), theEstimator(0),  theSigmaZ(0), theConfig (iConfig),
  beamSpot_(iConfig.getParameter<edm::InputTag>("beamSpot"))
{
  theCategory = "FastSimulation|Muons||FastTSGFromPropagation";
  theMeasurementTrackerEventTag = iConfig.getParameter<edm::InputTag>("MeasurementTrackerEvent");
}

FastTSGFromPropagation::FastTSGFromPropagation(const edm::ParameterSet & iConfig, const MuonServiceProxy* service,edm::ConsumesCollector& iC) : theTkLayerMeasurements(), theTracker(0), theNavigation(0), theService(service),theUpdator(0), theEstimator(0), theSigmaZ(0), theConfig (iConfig),
  beamSpot_(iConfig.getParameter<edm::InputTag>("beamSpot"))
{
  theCategory = "FastSimulation|Muons|FastTSGFromPropagation";
  theMeasurementTrackerEventTag = iConfig.getParameter<edm::InputTag>("MeasurementTrackerEvent");
}

FastTSGFromPropagation::~FastTSGFromPropagation()
{

  LogTrace(theCategory) << " FastTSGFromPropagation dtor called ";
  if ( theNavigation ) delete theNavigation;
  if ( theUpdator ) delete theUpdator;
  if ( theEstimator ) delete theEstimator;
  if ( theErrorMatrixAdjuster ) delete theErrorMatrixAdjuster;

}

void FastTSGFromPropagation::trackerSeeds(const TrackCand& staMuon, const TrackingRegion& region, 
                      const TrackerTopology *tTopo, std::vector<TrajectorySeed> & result) {

  if ( theResetMethod == "discrete" ) getRescalingFactor(staMuon);

  TrajectoryStateOnSurface staState = outerTkState(staMuon);

  if ( !staState.isValid() ) { 
    LogTrace(theCategory) << "Error: initial state from L2 muon is invalid.";
    return;
  }

  LogTrace(theCategory) << "begin of trackerSeed:\n staState pos: "<<staState.globalPosition()
                        << " mom: "<<staState.globalMomentum() 
                        <<"pos eta: "<<staState.globalPosition().eta()
                        <<"mom eta: "<<staState.globalMomentum().eta();


  std::vector<const DetLayer*> nls = theNavigation->compatibleLayers(*(staState.freeState()), oppositeToMomentum);

  LogTrace(theCategory) << " compatible layers: "<<nls.size();

  if ( nls.empty() ) return;

  int ndesLayer = 0;

  bool usePredictedState = false;

  if ( theUpdateStateFlag ) { //use updated states
     std::vector<TrajectoryMeasurement> alltm; 

     for (std::vector<const DetLayer*>::const_iterator inl = nls.begin();
         inl != nls.end(); inl++, ndesLayer++ ) {
         if ( (*inl == 0) ) break;
//         if ( (inl != nls.end()-1 ) && ( (*inl)->subDetector() == GeomDetEnumerators::TEC ) && ( (*(inl+1))->subDetector() == GeomDetEnumerators::TOB ) ) continue; 
         alltm = findMeasurements_new(*inl, staState);
         if ( (!alltm.empty()) ) {
            LogTrace(theCategory) << "final compatible layer: "<<ndesLayer;
            break;
         }
     }

     if ( alltm.empty() ) {
        LogTrace(theCategory) << " NO Measurements Found: eta: "<<staState.globalPosition().eta() <<"pt "<<staState.globalMomentum().perp();
        usePredictedState = true;
     } else {
       LogTrace(theCategory) << " Measurements for seeds: "<<alltm.size();
       std::stable_sort(alltm.begin(),alltm.end(),increasingEstimate()); 
       if ( alltm.size() > 5 ) alltm.erase(alltm.begin() + 5, alltm.end());

       const edm::SimTrackContainer* simTracks = &(*theSimTracks);
       const std::vector<unsigned> theSimTrackIds = theGSRecHits->ids();
       TrajectorySeedHitCandidate theSeedHits;
       std::vector<TrajectorySeedHitCandidate> outerHits;

       //std::vector<TrajectorySeed>  tmpTS;
       bool isMatch = false;
       for (std::vector<TrajectoryMeasurement>::const_iterator itm = alltm.begin(); itm != alltm.end(); itm++) {
       const TrajectoryStateOnSurface seedState = itm->predictedState();
       double preY = seedState.globalPosition().y();

       // Check SimTrack
       TrackingRecHit* aTrackingRecHit;
       FreeTrajectoryState simtrack_trackerstate;
       for( unsigned tkId=0;  tkId != theSimTrackIds.size(); ++tkId ) {
           const SimTrack & simtrack = (*simTracks)[theSimTrackIds[tkId]];
           SiTrackerGSMatchedRecHit2DCollection::range theRecHitRange = theGSRecHits->get(theSimTrackIds[tkId]);
           SiTrackerGSMatchedRecHit2DCollection::const_iterator theRecHitRangeIteratorBegin = theRecHitRange.first;
           SiTrackerGSMatchedRecHit2DCollection::const_iterator theRecHitRangeIteratorEnd   = theRecHitRange.second;
           SiTrackerGSMatchedRecHit2DCollection::const_iterator iterRecHit;

           GlobalPoint position(simtrack.trackerSurfacePosition().x(),
                            simtrack.trackerSurfacePosition().y(),
                            simtrack.trackerSurfacePosition().z());
           GlobalVector momentum(simtrack.trackerSurfaceMomentum().x(),
                         simtrack.trackerSurfaceMomentum().y(),
                         simtrack.trackerSurfaceMomentum().z());
           int charge = (int)simtrack.charge();
           GlobalTrajectoryParameters glb_parameters(position, momentum, charge, &*theService->magneticField().product());
           simtrack_trackerstate = FreeTrajectoryState(glb_parameters);

           unsigned int outerId = 0;
           for( iterRecHit = theRecHitRangeIteratorBegin; iterRecHit != theRecHitRangeIteratorEnd; ++iterRecHit) {
         theSeedHits = TrajectorySeedHitCandidate(&(*iterRecHit), theGeometry, tTopo);
           unsigned int id = theSeedHits.hit()->geographicalId().rawId();
           if( preY < 0 ) {
               if( id > outerId ) outerId = id;
           }
           else {
               if( id > outerId ) outerId = id;
           }
           }
           for( iterRecHit = theRecHitRangeIteratorBegin; iterRecHit != theRecHitRangeIteratorEnd; ++iterRecHit) {
         theSeedHits = TrajectorySeedHitCandidate(&(*iterRecHit), theGeometry, tTopo);
           if( itm->recHit()->hit()->geographicalId().rawId() == theSeedHits.hit()->geographicalId().rawId() ) {
               aTrackingRecHit = theSeedHits.hit()->clone();
                   TransientTrackingRecHit::ConstRecHitPointer recHit = theTTRHBuilder->build(aTrackingRecHit);
                   if( !recHit ) continue;
                   TrajectoryStateOnSurface updatedTSOS = updator()->update(seedState, *(recHit));
                   if( updatedTSOS.isValid() && passSelection(updatedTSOS) ) {
               edm::OwnVector<TrackingRecHit> container;
               container.push_back(recHit->hit()->clone());
               TrajectorySeed ts = createSeed(updatedTSOS, container, recHit->geographicalId());
               // check direction
               const BasicTrajectorySeed* aSeed = &ts;
               PTrajectoryStateOnDet PTSOD = aSeed->startingState();
               
               const GeomDet *g = theGeometry->idToDet(PTSOD.detId());
               TrajectoryStateOnSurface tsos = trajectoryStateTransform::transientState(PTSOD, &(g->surface()),  &*theService->magneticField().product());
               if( tsos.globalMomentum().basicVector()*seedState.globalMomentum().basicVector() < 0. ) continue;
               result.push_back(ts);
               isMatch = true;
               }
           }
           }
       }
       }
       if( !isMatch ) {
     // if there is no hits w.r.t. TM, find outermost hit
         for (std::vector<TrajectoryMeasurement>::const_iterator itm = alltm.begin(); itm != alltm.end(); itm++) {
       const TrajectoryStateOnSurface seedState = itm->predictedState();
       double preY = seedState.globalPosition().y();

       // Check SimTrack
       TrackingRecHit* aTrackingRecHit;
       FreeTrajectoryState simtrack_trackerstate;
       for( unsigned tkId=0;  tkId != theSimTrackIds.size(); ++tkId ) {
           const SimTrack & simtrack = (*simTracks)[theSimTrackIds[tkId]];
           SiTrackerGSMatchedRecHit2DCollection::range theRecHitRange = theGSRecHits->get(theSimTrackIds[tkId]);
           SiTrackerGSMatchedRecHit2DCollection::const_iterator theRecHitRangeIteratorBegin = theRecHitRange.first;
           SiTrackerGSMatchedRecHit2DCollection::const_iterator theRecHitRangeIteratorEnd   = theRecHitRange.second;
           SiTrackerGSMatchedRecHit2DCollection::const_iterator iterRecHit;

           GlobalPoint position(simtrack.trackerSurfacePosition().x(),
                            simtrack.trackerSurfacePosition().y(),
                            simtrack.trackerSurfacePosition().z());
           GlobalVector momentum(simtrack.trackerSurfaceMomentum().x(),
                         simtrack.trackerSurfaceMomentum().y(),
                         simtrack.trackerSurfaceMomentum().z());
           int charge = (int)simtrack.charge();
           GlobalTrajectoryParameters glb_parameters(position, momentum, charge, &*theService->magneticField().product());
           simtrack_trackerstate = FreeTrajectoryState(glb_parameters);

           unsigned int outerId = 0;
           for( iterRecHit = theRecHitRangeIteratorBegin; iterRecHit != theRecHitRangeIteratorEnd; ++iterRecHit) {
         theSeedHits = TrajectorySeedHitCandidate(&(*iterRecHit), theGeometry, tTopo);
           unsigned int id = theSeedHits.hit()->geographicalId().rawId();
           if( preY < 0 ) {
               if( id > outerId ) outerId = id;
           }
           else {
               if( id > outerId ) outerId = id;
           }
           }
           for( iterRecHit = theRecHitRangeIteratorBegin; iterRecHit != theRecHitRangeIteratorEnd; ++iterRecHit) {
         theSeedHits = TrajectorySeedHitCandidate(&(*iterRecHit), theGeometry, tTopo);
           if( outerId == theSeedHits.hit()->geographicalId().rawId() ) {
               aTrackingRecHit = theSeedHits.hit()->clone();
                   TransientTrackingRecHit::ConstRecHitPointer recHit = theTTRHBuilder->build(aTrackingRecHit);
                   if( !recHit ) continue;
                   TrajectoryStateOnSurface updatedTSOS = updator()->update(seedState, *(recHit));
                   if( updatedTSOS.isValid() && passSelection(updatedTSOS) ) {
               edm::OwnVector<TrackingRecHit> container;
               container.push_back(recHit->hit()->clone());
               TrajectorySeed ts = createSeed(updatedTSOS, container, recHit->geographicalId());
               // check direction
               const BasicTrajectorySeed* aSeed = &ts;
               PTrajectoryStateOnDet PTSOD = aSeed->startingState();
               
               const GeomDet *g = theGeometry->idToDet(PTSOD.detId());
               TrajectoryStateOnSurface tsos = trajectoryStateTransform::transientState(PTSOD, &(g->surface()),  &*theService->magneticField().product());
               if( tsos.globalMomentum().basicVector()*seedState.globalMomentum().basicVector() < 0. ) continue;
               result.push_back(ts);
               }
           }
           }
       }
         }
       }

       /*
       for( unsigned ir = 0; ir < tmpTS.size(); ir++ ) {
     const BasicTrajectorySeed* aSeed = &((tmpTS)[ir]);
     PTrajectoryStateOnDet PTSOD = aSeed->startingState();
     
     DetId seedDetId(PTSOD.detId());
     const GeomDet * g = theGeometry->idToDet(seedDetId);
     TrajectoryStateOnSurface tsos = trajectoryStateTransform::transientState(PTSOD, &(g->surface()),  &*theService->magneticField().product());
         cout << "tsos3 = " << tsos.globalMomentum() << endl;
     if( _index == ir ) {
         cout << "tsos4 = " << tsos.globalMomentum() << endl;
         result.push_back(tmpTS[ir]);
     }
       }
       */
       LogTrace(theCategory) << "result: "<<result.size();
       return;
     }
  }
  
  if ( !theUpdateStateFlag || usePredictedState ) { //use predicted states
     LogTrace(theCategory) << "use predicted state: ";
     for (std::vector<const DetLayer*>::const_iterator inl = nls.begin();
         inl != nls.end(); inl++ ) {

         if ( !result.empty() || *inl == 0 ) {
            break;
         }
         std::vector<DetLayer::DetWithState> compatDets = (*inl)->compatibleDets(staState, *propagator(), *estimator());
         LogTrace(theCategory) << " compatDets "<<compatDets.size();
         if ( compatDets.empty() ) continue;
         TrajectorySeed ts = createSeed(compatDets.front().second, compatDets.front().first->geographicalId());
         result.push_back(ts);

     }
     LogTrace(theCategory) << "result: "<<result.size();
     return;
  } 
  return;
}

void FastTSGFromPropagation::init(const MuonServiceProxy* service) {

  theMaxChi2 = theConfig.getParameter<double>("MaxChi2");

  theFixedErrorRescaling = theConfig.getParameter<double>("ErrorRescaling");

  theFlexErrorRescaling = 1.0;

  theResetMethod = theConfig.getParameter<std::string>("ResetMethod");

  if (theResetMethod != "discrete" && theResetMethod != "fixed" && theResetMethod != "matrix"  ) {
    edm::LogError("FastTSGFromPropagation") 
      <<"Wrong error rescaling method: "<<theResetMethod <<"\n"
      <<"Possible choices are: discrete, fixed, matrix.\n"
      <<"Use discrete method" <<std::endl;
    theResetMethod = "discrete"; 
  }

  theEstimator = new Chi2MeasurementEstimator(theMaxChi2);

  theCacheId_MT = 0;

  theCacheId_TG = 0;

  thePropagatorName = theConfig.getParameter<std::string>("Propagator");

  theService = service;

  theUseVertexStateFlag = theConfig.getParameter<bool>("UseVertexState");

  theUpdateStateFlag = theConfig.getParameter<bool>("UpdateState");

  theSelectStateFlag = theConfig.getParameter<bool>("SelectState");

  theSimTrackCollectionLabel = theConfig.getParameter<edm::InputTag>("SimTrackCollectionLabel");
  theHitProducer = theConfig.getParameter<edm::InputTag>("HitProducer");

  theUpdator = new KFUpdator();

  theSigmaZ = theConfig.getParameter<double>("SigmaZ");

  edm::ParameterSet errorMatrixPset = theConfig.getParameter<edm::ParameterSet>("errorMatrixPset");
  if ( theResetMethod == "matrix" && !errorMatrixPset.empty()){
    theAdjustAtIp = errorMatrixPset.getParameter<bool>("atIP");
    theErrorMatrixAdjuster = new MuonErrorMatrix(errorMatrixPset);
  } else {
    theAdjustAtIp =false;
    theErrorMatrixAdjuster=0;
  }

  theService->eventSetup().get<TrackerRecoGeometryRecord>().get(theTracker); 
  theNavigation = new DirectTrackerNavigation(theTracker);

  edm::ESHandle<TrackerGeometry>        geometry;
  theService->eventSetup().get<TrackerDigiGeometryRecord>().get(geometry);
  theGeometry = &(*geometry);

  theService->eventSetup().get<TransientRecHitRecord>().get("WithTrackAngle", theTTRHBuilder);

}

void FastTSGFromPropagation::setEvent(const edm::Event& iEvent) {

  iEvent.getByLabel(beamSpot_, theBeamSpot);
  
  // retrieve the MC truth (SimTracks)
  iEvent.getByLabel(theSimTrackCollectionLabel, theSimTracks);
  iEvent.getByLabel(theHitProducer, theGSRecHits);


  unsigned long long newCacheId_MT = theService->eventSetup().get<CkfComponentsRecord>().cacheIdentifier();

  if ( theUpdateStateFlag && newCacheId_MT != theCacheId_MT ) {
    LogTrace(theCategory) << "Measurment Tracker Geometry changed!";
    theCacheId_MT = newCacheId_MT;
    theService->eventSetup().get<CkfComponentsRecord>().get(theMeasTracker);
  }

  if ( theUpdateStateFlag ) {
     iEvent.getByLabel(theMeasurementTrackerEventTag, theMeasTrackerEvent);
     theTkLayerMeasurements = LayerMeasurements(*theMeasTracker,*theMeasTrackerEvent);
  }

  bool trackerGeomChanged = false;

  unsigned long long newCacheId_TG = theService->eventSetup().get<TrackerRecoGeometryRecord>().cacheIdentifier();

  if ( newCacheId_TG != theCacheId_TG ) {
    LogTrace(theCategory) << "Tracker Reco Geometry changed!";
    theCacheId_TG = newCacheId_TG;
    theService->eventSetup().get<TrackerRecoGeometryRecord>().get(theTracker);
    trackerGeomChanged = true;
  }

  if ( trackerGeomChanged && (&*theTracker) ) {
    if ( theNavigation ) delete theNavigation;
    theNavigation = new DirectTrackerNavigation(theTracker);
  }
}

TrajectoryStateOnSurface FastTSGFromPropagation::innerState(const TrackCand& staMuon) const {

  TrajectoryStateOnSurface innerTS;

  if ( staMuon.first && staMuon.first->isValid() ) {
    if (staMuon.first->direction() == alongMomentum) {
      innerTS = staMuon.first->firstMeasurement().updatedState();
    } 
    else if (staMuon.first->direction() == oppositeToMomentum) { 
      innerTS = staMuon.first->lastMeasurement().updatedState();
    }
  } else {
    innerTS = trajectoryStateTransform::innerStateOnSurface(*(staMuon.second),*theService->trackingGeometry(), &*theService->magneticField());
  }
  //rescale the error
  adjust(innerTS);

  return  innerTS;

}

TrajectoryStateOnSurface FastTSGFromPropagation::outerTkState(const TrackCand& staMuon) const {

  TrajectoryStateOnSurface result;

  if ( theUseVertexStateFlag && staMuon.second->pt() > 1.0 ) {
    FreeTrajectoryState iniState = trajectoryStateTransform::initialFreeState(*(staMuon.second), &*theService->magneticField());
    //rescale the error at IP
    adjust(iniState); 

    StateOnTrackerBound fromInside(&*(theService->propagator("PropagatorWithMaterial")));
    result = fromInside(iniState);
  } else {
    StateOnTrackerBound fromOutside(&*propagator());
    result = fromOutside(innerState(staMuon));
  }
  return result;
}

TrajectorySeed FastTSGFromPropagation::createSeed(const TrajectoryStateOnSurface& tsos, const DetId& id) const {

  edm::OwnVector<TrackingRecHit> container;
  return createSeed(tsos, container, id);

}

TrajectorySeed FastTSGFromPropagation::createSeed(const TrajectoryStateOnSurface& tsos, const edm::OwnVector<TrackingRecHit>& container, const DetId& id) const {

  PTrajectoryStateOnDet seedTSOS = trajectoryStateTransform::persistentState(tsos,id.rawId());
  return TrajectorySeed(seedTSOS,container,oppositeToMomentum);

}


void FastTSGFromPropagation::validMeasurements(std::vector<TrajectoryMeasurement>& tms) const {

  std::vector<TrajectoryMeasurement>::iterator tmsend = std::remove_if(tms.begin(), tms.end(), isInvalid());
  tms.erase(tmsend, tms.end());
  return;

}

std::vector<TrajectoryMeasurement> FastTSGFromPropagation::findMeasurements_new(const DetLayer* nl, const TrajectoryStateOnSurface& staState) const {

  std::vector<TrajectoryMeasurement> result;

  std::vector<DetLayer::DetWithState> compatDets = nl->compatibleDets(staState, *propagator(), *estimator());
  if ( compatDets.empty() )  return result;

  for (std::vector<DetLayer::DetWithState>::const_iterator idws = compatDets.begin(); idws != compatDets.end(); ++idws) {
     if ( idws->second.isValid() && (idws->first) )  {
         std::vector<TrajectoryMeasurement> tmptm = 
           theMeasTrackerEvent->idToDet(idws->first->geographicalId()).fastMeasurements(idws->second, idws->second, *propagator(), *estimator());
         //validMeasurements(tmptm);
//         if ( tmptm.size() > 2 ) {
//            std::stable_sort(tmptm.begin(),tmptm.end(),increasingEstimate());
//            result.insert(result.end(),tmptm.begin(), tmptm.begin()+2);
//         } else {
            result.insert(result.end(),tmptm.begin(), tmptm.end());
//         }
     }
  }
  
  return result;

}

std::vector<TrajectoryMeasurement> FastTSGFromPropagation::findMeasurements(const DetLayer* nl, const TrajectoryStateOnSurface& staState) const {

  std::vector<TrajectoryMeasurement> result = tkLayerMeasurements()->measurements((*nl), staState, *propagator(), *estimator());
  validMeasurements(result);
  return result;
}

bool FastTSGFromPropagation::passSelection(const TrajectoryStateOnSurface& tsos) const {
  if ( !theSelectStateFlag ) return true;
  else {
     if ( theBeamSpot.isValid() ) {
       return ( ( fabs(zDis(tsos) - theBeamSpot->z0() ) < theSigmaZ) );

     } else {
       return ( ( fabs(zDis(tsos)) < theSigmaZ) ); 
//      double theDxyCut = 100;
//      return ( (zDis(tsos) < theSigmaZ) && (dxyDis(tsos) < theDxyCut) );
     }
  }

}

double FastTSGFromPropagation::dxyDis(const TrajectoryStateOnSurface& tsos) const {
  return fabs(( - tsos.globalPosition().x() * tsos.globalMomentum().y() + tsos.globalPosition().y() * tsos.globalMomentum().x() )/tsos.globalMomentum().perp());
}

double FastTSGFromPropagation::zDis(const TrajectoryStateOnSurface& tsos) const {
  return tsos.globalPosition().z() - tsos.globalPosition().perp() * tsos.globalMomentum().z()/tsos.globalMomentum().perp();
}

void FastTSGFromPropagation::getRescalingFactor(const TrackCand& staMuon) {
    float pt = (staMuon.second)->pt();
    if ( pt < 13.0 ) theFlexErrorRescaling = 3; 
    else if ( pt < 30.0 ) theFlexErrorRescaling = 5;
    else theFlexErrorRescaling = 10;
    return;
}


void FastTSGFromPropagation::adjust(FreeTrajectoryState & state) const {

  //rescale the error
  if ( theResetMethod == "discreate" ) {
     state.rescaleError(theFlexErrorRescaling);
     return;
  }

  //rescale the error
  if ( theResetMethod == "fixed" || !theErrorMatrixAdjuster) {
     state.rescaleError(theFixedErrorRescaling);
     return;
  }

  CurvilinearTrajectoryError oMat = state.curvilinearError();
  CurvilinearTrajectoryError sfMat = theErrorMatrixAdjuster->get(state.momentum());//FIXME with position
  MuonErrorMatrix::multiply(oMat, sfMat);
  
  state = FreeTrajectoryState(state.parameters(),
                  oMat);
}

void FastTSGFromPropagation::adjust(TrajectoryStateOnSurface & state) const {

  //rescale the error
  if ( theResetMethod == "discreate" ) {
     state.rescaleError(theFlexErrorRescaling);
     return;
  }

  if ( theResetMethod == "fixed" || !theErrorMatrixAdjuster) {
     state.rescaleError(theFixedErrorRescaling);
     return;
  }

  CurvilinearTrajectoryError oMat = state.curvilinearError();
  CurvilinearTrajectoryError sfMat = theErrorMatrixAdjuster->get(state.globalMomentum());//FIXME with position
  MuonErrorMatrix::multiply(oMat, sfMat);
  
  state = TrajectoryStateOnSurface(state.weight(),
                                   state.globalParameters(),
                   oMat,
                   state.surface(),
                   state.surfaceSide());
}

void FastTSGFromPropagation::stateOnDet(const TrajectoryStateOnSurface& ts,
                    unsigned int detid,
                    PTrajectoryStateOnDet& pts) const
{
    const AlgebraicSymMatrix55& m = ts.localError().matrix();
    int dim = 5; 
    float localErrors[15];
    int k = 0;
    for (int i=0; i<dim; ++i) {
    for (int j=0; j<=i; ++j) {
        localErrors[k++] = m(i,j);
    }
    }
    int surfaceSide = static_cast<int>(ts.surfaceSide());
    pts = PTrajectoryStateOnDet( ts.localParameters(),ts.globalMomentum().perp(),
                    localErrors, detid,
                surfaceSide);
}