#include <CSCSegAlgoShowering.h>

Public Types
typedef std::vector< const CSCRecHit2D * >	ChamberHitContainer

Public Member Functions
	CSCSegAlgoShowering (const edm::ParameterSet &ps)
	Constructor. More...

CSCSegment	showerSeg (const CSCChamber *aChamber, const ChamberHitContainer &rechits)

virtual	~CSCSegAlgoShowering ()
	Destructor. More...

Private Member Functions
bool	addHit (const CSCRecHit2D *hit, int layer)

void	compareProtoSegment (const CSCRecHit2D *h, int layer)

bool	hasHitOnLayer (int layer) const

bool	isHitNearSegment (const CSCRecHit2D *h) const
	Utility functions. More...

void	pruneFromResidual (void)

void	updateParameters (void)

Private Attributes
float	chi2Max

bool	debug

double	dPhiFineMax

double	dRPhiFineMax

float	maxDPhi

float	maxDTheta

float	maxRatioResidual

int	minHitsPerSegment

const std::string	myName

ChamberHitContainer	protoSegment

CSCSegFit *	sfit_

float	tanPhiMax

float	tanThetaMax

const CSCChamber *	theChamber

Detailed Description

Definition at line 26 of file CSCSegAlgoShowering.h.

Member Typedef Documentation

typedef std::vector<const CSCRecHit2D*> CSCSegAlgoShowering::ChamberHitContainer

Definition at line 30 of file CSCSegAlgoShowering.h.

Constructor & Destructor Documentation

CSCSegAlgoShowering::CSCSegAlgoShowering ( const edm::ParameterSet & ps )

explicit

Constructor.

Definition at line 27 of file CSCSegAlgoShowering.cc.

References dPhiFineMax, dRPhiFineMax, edm::ParameterSet::getParameter(), maxDPhi, maxDTheta, maxRatioResidual, tanPhiMax, and tanThetaMax.

                                                                   : sfit_(0) {
 //  debug                  = ps.getUntrackedParameter<bool>("CSCSegmentDebug");
   dRPhiFineMax           = ps.getParameter<double>("dRPhiFineMax");
   dPhiFineMax            = ps.getParameter<double>("dPhiFineMax");
   tanThetaMax            = ps.getParameter<double>("tanThetaMax");
   tanPhiMax              = ps.getParameter<double>("tanPhiMax");    
   maxRatioResidual       = ps.getParameter<double>("maxRatioResidualPrune");
 //  maxDR                  = ps.getParameter<double>("maxDR");
   maxDTheta              = ps.getParameter<double>("maxDTheta");
   maxDPhi                = ps.getParameter<double>("maxDPhi");
 }

CSCSegAlgoShowering::~CSCSegAlgoShowering ( )

virtual

Destructor.

Definition at line 43 of file CSCSegAlgoShowering.cc.

                                          {
 
 }

Member Function Documentation

bool CSCSegAlgoShowering::addHit	(	const CSCRecHit2D *	hit,
		int	layer
	)

private

Definition at line 287 of file CSCSegAlgoShowering.cc.

References convertSQLiteXML::ok, and protoSegment.

Referenced by compareProtoSegment().

                                                                    {
   
   // Return true if hit was added successfully
   // Return false if there is already a hit on the same layer
   
   bool ok = true;
   
   // Test that we are not trying to add the same hit again
   for ( ChamberHitContainer::const_iterator it = protoSegment.begin(); it != protoSegment.end(); it++ ) 
     if ( aHit == (*it)  ) return false;
   
   protoSegment.push_back(aHit);
 
   return ok;
 }    

void CSCSegAlgoShowering::compareProtoSegment	(	const CSCRecHit2D *	h,
		int	layer
	)

private

Definition at line 310 of file CSCSegAlgoShowering.cc.

References addHit(), CSCSegFit::chi2(), CSCSegFit::fit(), convertSQLiteXML::ok, protoSegment, sfit_, and theChamber.

Referenced by showerSeg().

                                                                              {
   
   // Try adding the hit to existing segment, and removing one from the  same layer
   ChamberHitContainer::iterator it;
   for ( it = protoSegment.begin(); it != protoSegment.end(); ) {
     if ( (*it)->cscDetId().layer() == layer ) {
       it = protoSegment.erase(it);
     } else {
       ++it;
     }
   }
   bool ok = addHit(h, layer);
   if (ok) {
     CSCSegFit* newfit = new CSCSegFit(theChamber, protoSegment);
     newfit->fit();
     if ( newfit->chi2() > sfit_->chi2() ) {
       // new fit is worse: revert to old fit
       delete newfit;
     }
     else {
       // new fit is better
       delete sfit_;
       sfit_ = newfit;
     }
   }
 }

bool CSCSegAlgoShowering::hasHitOnLayer ( int layer ) const

private

bool CSCSegAlgoShowering::isHitNearSegment ( const CSCRecHit2D * h ) const

private

Utility functions.

Definition at line 250 of file CSCSegAlgoShowering.cc.

References CSCRecHit2D::cscDetId(), SiPixelRawToDigiRegional_cfi::deltaPhi, dPhiFineMax, dRPhiFineMax, CSCChamber::layer(), CSCDetId::layer(), CSCRecHit2D::localPosition(), M_PI, PV3DBase< T, PVType, FrameType >::phi(), dttmaxenums::R, sfit_, mathSSE::sqrt(), theChamber, GeomDet::toGlobal(), GeomDet::toLocal(), PV3DBase< T, PVType, FrameType >::x(), CSCSegFit::xfit(), PV3DBase< T, PVType, FrameType >::y(), CSCSegFit::yfit(), z, and PV3DBase< T, PVType, FrameType >::z().

Referenced by showerSeg().

                                                                          {
 
   const CSCLayer* layer = theChamber->layer(hit->cscDetId().layer());
 
   // hit phi position in global coordinates
   GlobalPoint Hgp = layer->toGlobal(hit->localPosition());
   double Hphi = Hgp.phi();                                
   if (Hphi < 0.) Hphi += 2.*M_PI;
   LocalPoint Hlp = theChamber->toLocal(Hgp);
   double z = Hlp.z();  
 
   double LocalX = sfit_->xfit(z);
   double LocalY = sfit_->yfit(z);
   LocalPoint Slp(LocalX, LocalY, z);
   GlobalPoint Sgp = theChamber->toGlobal(Slp); 
   double Sphi = Sgp.phi();
   if (Sphi < 0.) Sphi += 2.*M_PI;
   double R = sqrt(Sgp.x()*Sgp.x() + Sgp.y()*Sgp.y());
   
   double deltaPhi = Sphi - Hphi;
   if (deltaPhi >  2.*M_PI) deltaPhi -= 2.*M_PI;
   if (deltaPhi < -2.*M_PI) deltaPhi += 2.*M_PI;
   if (deltaPhi < 0.) deltaPhi = -deltaPhi; 
 
   double RdeltaPhi = R * deltaPhi;
 
   if (RdeltaPhi < dRPhiFineMax && deltaPhi < dPhiFineMax ) return true;
 
   return false;
 }

void CSCSegAlgoShowering::pruneFromResidual ( void )

private

Definition at line 340 of file CSCSegAlgoShowering.cc.

References CSCRecHit2D::cscDetId(), CSCChamber::layer(), CSCDetId::layer(), CSCRecHit2D::localPosition(), maxRatioResidual, protoSegment, CSCSegFit::Rdev(), sfit_, theChamber, GeomDet::toGlobal(), GeomDet::toLocal(), updateParameters(), findQualityFiles::v, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), z, and PV3DBase< T, PVType, FrameType >::z().

Referenced by showerSeg().

                                                {
 
   //@@ THIS FUNCTION HAS 3 RETURNS PATHS!
 
   // Only prune if have at least 5 hits 
   if ( protoSegment.size() < 5 ) return;
 
   // Now Study residuals
       
   float maxResidual = 0.;
   float sumResidual = 0.;
   int nHits = 0;
 
   ChamberHitContainer::iterator ih;
   ChamberHitContainer::iterator ibad = protoSegment.end();
 
   for ( ih = protoSegment.begin(); ih != protoSegment.end(); ++ih ) {
     const CSCRecHit2D& hit = (**ih);
     const CSCLayer* layer  = theChamber->layer(hit.cscDetId().layer());
     GlobalPoint gp         = layer->toGlobal(hit.localPosition());
     LocalPoint lp          = theChamber->toLocal(gp);
 
     double u = lp.x();
     double v = lp.y();
     double z = lp.z();
 
     //    double du = segfit->xdev( u, z ); 
     //    double dv = segfit->ydev( v, z );
 
     float residual = sfit_->Rdev(u, v, z); // == sqrt(du*du + dv*dv)
 
     sumResidual += residual;
     ++nHits;
     if ( residual > maxResidual ) {
       maxResidual = residual;
       ibad = ih;
     }
   }
 
   float corrAvgResidual = (sumResidual - maxResidual)/(nHits -1);
 
   // Keep all hits 
   if ( maxResidual/corrAvgResidual < maxRatioResidual ) return;
 
   // Drop worst hit
   if( ibad != protoSegment.end() ) protoSegment.erase(ibad);
 
   // Make a new fit
   updateParameters();
 
   return;
 }

CSCSegment CSCSegAlgoShowering::showerSeg	(	const CSCChamber *	aChamber,
		const ChamberHitContainer &	rechits
	)

Definition at line 51 of file CSCSegAlgoShowering.cc.

References CSCSegFit::chi2(), compareProtoSegment(), CSCSegFit::covarianceMatrix(), CSCRecHit2D::cscDetId(), mps_update::diff, dPhi(), h, CSCSegFit::hits(), i, customizeTrackingMonitorSeedNumber::idx, CSCSegFit::intercept(), isHitNearSegment(), CSCChamber::layer(), CSCDetId::layer(), CSCSegFit::localdir(), CSCRecHit2D::localPosition(), PV3DBase< T, PVType, FrameType >::mag(), maxDPhi, maxDTheta, gen::n, CSCSegFit::nhits(), Geom::Phi< T >::phi(), PV3DBase< T, PVType, FrameType >::phi(), protoSegment, pruneFromResidual(), sfit_, groupFilesInBlocks::temp, theChamber, PV3DBase< T, PVType, FrameType >::theta(), GeomDet::toGlobal(), GeomDet::toLocal(), updateParameters(), x, PV3DBase< T, PVType, FrameType >::x(), y, PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by CSCSegAlgoST::buildSegments(), and CSCSegAlgoDF::buildSegments().

                                                                                                           {
 
   theChamber = aChamber;
   // Initialize parameters
   std::vector<float> x, y, gz;
   std::vector<int> n;
   
   
   for (int i = 0; i < 6; ++i) {
     x.push_back(0.);
     y.push_back(0.);
     gz.push_back(0.);
     n.push_back(0);
   }
 
   // Loop over hits to find center-of-mass position in each layer
   for (ChamberHitContainer::const_iterator it = rechits.begin(); it != rechits.end(); ++it ) {
     const CSCRecHit2D& hit = (**it);
     const CSCDetId id = hit.cscDetId();
     int l_id = id.layer();
     const CSCLayer* layer  = theChamber->layer(hit.cscDetId().layer());
     GlobalPoint gp         = layer->toGlobal(hit.localPosition());
     LocalPoint  lp         = theChamber->toLocal(gp);
 
     ++n[l_id -1];
     x[l_id -1] += lp.x();
     y[l_id -1] += lp.y();
     gz[l_id -1] += gp.z();
   }
 
 
   // Determine center of mass for each layer and average center of mass for chamber
   float avgChamberX = 0.;
   float avgChamberY = 0.;
   int n_lay = 0;
 
   for (unsigned i = 0; i < 6; ++i) {
     if (n[i] < 1 ) continue;
  
     x[i] = x[i]/n[i];
     y[i] = y[i]/n[i];
     avgChamberX += x[i];
     avgChamberY += y[i];
     n_lay++;
 
   }
 
   if ( n_lay > 0) {
     avgChamberX = avgChamberX / n_lay;
     avgChamberY = avgChamberY / n_lay;
   }
 
   // Create a FakeSegment origin that points back to the IP
   // Keep all this in global coordinates until last minute to avoid screwing up +/- signs !
 
   LocalPoint   lpCOM(avgChamberX, avgChamberY, 0.);
   GlobalPoint  gpCOM = theChamber->toGlobal(lpCOM);
   GlobalVector gvCOM(gpCOM.x(), gpCOM.y(), gpCOM.z());
 
   float Gdxdz = gpCOM.x()/gpCOM.z();
   float Gdydz = gpCOM.y()/gpCOM.z();
 
   // Figure out the intersection of this vector with each layer of the chamber
   // by projecting the vector
   std::vector<LocalPoint> layerPoints;
 
   for (size_t i = 0; i!=6; ++i) {
     // Get the layer z coordinates in global frame
     const CSCLayer* layer = theChamber->layer(i+1);
     LocalPoint temp(0., 0., 0.);
     GlobalPoint gp = layer->toGlobal(temp);
     float layer_Z = gp.z();
 
     // Then compute interesection of vector with that plane
     float layer_X = Gdxdz * layer_Z;
     float layer_Y = Gdydz * layer_Z;
     GlobalPoint Gintersect(layer_X, layer_Y, layer_Z);
     LocalPoint  Lintersect = theChamber->toLocal(Gintersect);
 
     float layerX = Lintersect.x();
     float layerY = Lintersect.y();
     float layerZ = Lintersect.z();
     LocalPoint layerPoint(layerX, layerY, layerZ);
     layerPoints.push_back(layerPoint);
   }
 
 
   std::vector<float> r_closest;
   std::vector<int> id;
   for (size_t i = 0; i!=6; ++i ) {
     id.push_back(-1);
     r_closest.push_back(9999.);
   }
 
   int idx = 0;
 
   // Loop over all hits and find hit closest to com for that layer.
   for (ChamberHitContainer::const_iterator it = rechits.begin(); it != rechits.end(); ++it ) {    
     const CSCRecHit2D& hit = (**it);
     int layId = hit.cscDetId().layer();
 
     const CSCLayer* layer  = theChamber->layer(layId);
     GlobalPoint gp         = layer->toGlobal(hit.localPosition());
     LocalPoint  lp         = theChamber->toLocal(gp);
 
     float d_x = lp.x() - layerPoints[layId-1].x();
     float d_y = lp.y() - layerPoints[layId-1].y();
 
     LocalPoint diff(d_x, d_y, 0.);
 
     if ( fabs(diff.mag() ) < r_closest[layId-1] ) {
        r_closest[layId-1] =  fabs(diff.mag());
        id[layId-1] = idx;
     }
     ++idx;
   }
 
   // Now fill vector of rechits closest to center of mass:
   protoSegment.clear();
   idx = 0;
 
   // Loop over all hits and find hit closest to com for that layer.
   for (ChamberHitContainer::const_iterator it = rechits.begin(); it != rechits.end(); ++it ) {    
     const CSCRecHit2D& hit = (**it);
     int layId = hit.cscDetId().layer();
 
     if ( idx == id[layId-1] )protoSegment.push_back(*it);
 
     ++idx;    
   }
 
   // Reorder hits in protosegment
   if ( gz[0] > 0. ) {
     if ( gz[0] > gz[5] ) { 
       reverse( protoSegment.begin(), protoSegment.end() );
     }    
   }
   else if ( gz[0] < 0. ) {
     if ( gz[0] < gz[5] ) {
       reverse( protoSegment.begin(), protoSegment.end() );
     }    
   }
 
   // Fit the protosegment
   updateParameters();
 
   // If there is one very bad hit on segment, remove it and refit
   if (protoSegment.size() > 4) pruneFromResidual();
 
   // If any hit on a layer is closer to segment than original, replace it and refit
   for (ChamberHitContainer::const_iterator it = rechits.begin(); it != rechits.end(); it++ ) {
     const CSCRecHit2D* h = *it;
     int layer = h->cscDetId().layer();
     if ( isHitNearSegment( h ) ) compareProtoSegment( h, layer );
   }
 
   // Check again for a bad hit, and remove and refit if necessary
   if ( sfit_->nhits() > 5 ) pruneFromResidual( );
 
   // Does the fitted line point to the IP?
   // If it doesn't, the algorithm has probably failed i.e. that's life!
 
   GlobalVector protoGlobalDir = theChamber->toGlobal( sfit_->localdir() );  
   double protoTheta = protoGlobalDir.theta();
   double protoPhi = protoGlobalDir.phi();
   double simTheta = gvCOM.theta();
   double simPhi = gvCOM.phi();
   
   float dTheta = fabs(protoTheta - simTheta);
   float dPhi   = fabs(protoPhi - simPhi);
   //  float dR = sqrt(dEta*dEta + dPhi*dPhi);
   
   // Flag the segment with chi2=-1 of the segment isn't pointing toward origin      
   // i.e. flag that the algorithm has probably just failed (I presume we expect
   // a segment to point to the IP if the algorithm is successful!)
 
   double theFlag = -1.;
   if (dTheta > maxDTheta || dPhi > maxDPhi) {
   }
   else {
     theFlag = sfit_->chi2(); // If it points to IP, just pass fit chi2 as usual
   }
 
   // Create an actual CSCSegment - retrieve all info from the fit
   CSCSegment temp(sfit_->hits(), sfit_->intercept(), 
           sfit_->localdir(), sfit_->covarianceMatrix(), theFlag );
   delete sfit_;
   sfit_ = 0;
 
   return temp;
 } 

void CSCSegAlgoShowering::updateParameters ( void )

private

Definition at line 393 of file CSCSegAlgoShowering.cc.

References CSCSegFit::fit(), protoSegment, sfit_, and theChamber.

Referenced by pruneFromResidual(), and showerSeg().

                                                {
   // Create fit for the hits in the protosegment & run it
   delete sfit_;
   sfit_ = new CSCSegFit( theChamber, protoSegment );
   sfit_->fit();
 }