[u/mrichter/AliRoot.git] / HLT / hough / AliL3HoughTransformerVhdl.cxx

//$Id$

// Author: Constantin Loizides <mailto:loizides@fi.uib.no>
//*-- Copyright&Copy CL

#include <stream.h>

#include "AliL3MemHandler.h"
#include "AliL3Logging.h"
#include "AliL3Transform.h"
#include "AliL3DigitData.h"
#include "AliL3Histogram.h"


//try to be close to VHDL version (eg. LUTs)
//VESTBO: if you switch that of, you should get your version
//of the transformer!!!
#define VHDLVERSION

//dont use dynamic objects on heap
//VESTBO: this a desperately switched on in order 
//to find the bug, which i thought hat something
//to do with a wrong heap assignment! But the
//data still gets overwritten!
#define VHDLSTATIC

//switch off if you want to have floating point
//#define USEFFLOAT
#include "AliL3HoughTransformerVhdl.h"

/** \class AliL3HoughTransformerVhdl
// <pre>
//_____________________________________________________________
// AliL3HoughTransformerVhdl
//
// Hough transformation class for VHDL comparism.
//
//</pre>
*/

ClassImp(AliL3HoughTransformerVhdl)

#ifdef VHDLVERSION

AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl()
            : AliL3HoughBaseTransformer()
{
  fParamSpace=0;
#ifndef VHDLSTATIC
  fLUTX=0;
  fLUTY=0;
  fLUTEta=0;
  fLUTphi0=0;
  fLUT2sinphi0=0;
  fLUT2cosphi0=0;
#endif
  fMinRow=0;
  fMaxRow=0;
  fNRows=0;
  fNEtas=0;
  fNPhi0=0;
  fSector=0;
  fSectorRow=0;
  fZSign=0;
  fZLengthPlusOff=0.;
  fTimeWidth=0.;
  fPadPitch=0.;
  fEtaSlice=0.;
}

AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl(Int_t slice,Int_t patch,Int_t n_eta_segments) 
  : AliL3HoughBaseTransformer(slice,patch,n_eta_segments)
{
  AliL3HoughTransformerVhdl();

  Init(slice,patch,n_eta_segments);
}

AliL3HoughTransformerVhdl::~AliL3HoughTransformerVhdl()
{
  DeleteHistograms();

#ifndef VHDLSTATIC
  if(fNRows){
    delete[] fLUTX;
    delete[] fLUTY;
  }
  if(fNEtas) delete[] fLUTEta;
#endif
}

void AliL3HoughTransformerVhdl::Init(Int_t slice=0,Int_t patch=0,Int_t n_eta_segments=100)
{
  cout << "InitVhdl " << slice << " " << patch << " " << n_eta_segments << endl;
  AliL3HoughBaseTransformer::Init(slice,patch,n_eta_segments);

#ifndef VHDLSTATIC
  //delete old LUT tables
  if(fNRows){
    fNRows=0;
    delete[] fLUTX;
    delete[] fLUTY;
  }
  if(fNEtas){
    delete[] fLUTEta;
    fNEtas=0;
  }
#endif

  //set when histogram is filled
  //fLUTphi0=0;
  //fLUT2sinphi0=0;
  //fLUT2cosphi0=0;

  Int_t minrow_=AliL3Transform::GetFirstRow(patch);
  Int_t maxrow_=AliL3Transform::GetLastRow(patch);
  Int_t n_=AliL3Transform::GetNRows(patch);
  Int_t sector_=0,sectorrow_=0;
  AliL3Transform::Slice2Sector(slice,minrow_,sector_,sectorrow_);
  Float_t padpitch_=0.;
  if(sector_<AliL3Transform::GetNSectorLow())
    padpitch_=AliL3Transform::GetPadPitchWidthLow();
  else
    padpitch_=AliL3Transform::GetPadPitchWidthUp();  

  Float_t etamax_=GetEtaMax();
  Float_t etamin_=GetEtaMin();
  Float_t etaslice_=(etamax_-etamin_)/n_eta_segments;

  //lookup tables for X and Y
#ifndef VHDLSTATIC
  fLUTX=new AliL3FFloat[n_];
  fLUTY=new AliL3FFloat[n_]; 
#endif
  for(Int_t rr=0;rr<n_;rr++){
    fLUTX[rr]=Float_t(AliL3Transform::Row2X(rr+minrow_));
    fLUTY[rr]=Float_t(0.5*(AliL3Transform::GetNPads(rr+minrow_)-1)*padpitch_);
    //VESTBO: uncomment to see values (and compare with Print function)
    //cout << rr << ": " << (Float_t)fLUTX[rr] << " " << (Float_t)fLUTY[rr] << endl;
  }

  //lookup tables for rz2s <=> etas
#ifndef VHDLSTATIC
  fLUTEta=new AliL3FFloat[n_eta_segments];
#endif
  for(Int_t rr=0;rr<n_eta_segments;rr++){
    fLUTEta[rr]=CalcRoverZ2(etamin_+(rr+1)*etaslice_);
    //VESTBO: uncomment to see values (and compare with Print function)
    //cout << rr << ": " << fLUTEta[rr] << endl;
  }

  //member values
  fMinRow=minrow_;
  fMaxRow=maxrow_;
  fNRows=n_;
  fNEtas=n_eta_segments;
  fNPhi0=0;
  fSector=sector_;
  fSectorRow=sectorrow_;
  fZSign = slice < 18 ? 1:-1;
  fZLengthPlusOff=AliL3Transform::GetZLength()+AliL3Transform::GetZOffset();
  fTimeWidth=AliL3Transform::GetZWidth();
  fPadPitch=padpitch_;
  fEtaSlice=etaslice_;
}

Float_t AliL3HoughTransformerVhdl::CalcRoverZ2(Float_t eta)
{
  Float_t e=exp(2*eta);
  Float_t ret=(e+1)/(e-1);
  ret*=ret;
  return ret;
}

Float_t AliL3HoughTransformerVhdl::CalcEta(Float_t roverz2)
{
  Float_t rz=sqrt(roverz2);
  if(fZSign>0) rz=-rz;
  Float_t ret=(1+rz)/(rz-1);
  ret=0.5*log(ret);
  return ret;
}

inline Float_t AliL3HoughTransformerVhdl::CalcX(Int_t row)
{
  return fLUTX[row];
}

inline Float_t AliL3HoughTransformerVhdl::CalcY(Int_t pad,Int_t row)
{
  return pad*fPadPitch-fLUTY[row];
}

inline Float_t AliL3HoughTransformerVhdl::CalcZ(Int_t time)
{
  Float_t ret=time*fTimeWidth;
  if(fZSign>0) ret=fZLengthPlusOff-ret;
  else ret=ret-fZLengthPlusOff;
  return ret;
}

void AliL3HoughTransformerVhdl::DeleteHistograms()
{
  if(!fParamSpace) return;
  for(Int_t i=0; i<GetNEtaSegments(); i++){
    if(!fParamSpace[i]) continue;
    delete fParamSpace[i];
  }
  delete[] fParamSpace;

#ifndef VHDLSTATIC
  if(fNPhi0){
    fNPhi0=0;
    delete[] fLUT2sinphi0;
    delete[] fLUT2cosphi0;
    delete[] fLUTphi0;
  }
#endif
}

void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t pt_min,Int_t nybin,Double_t phimin,Double_t phimax)
{
  //Create the histograms (parameter space).
  //These are 2D histograms, span by kappa (curvature of track) and phi0 (emission angle with x-axis).
  //The arguments give the range and binning; 
  //nxbin = #bins in kappa
  //nybin = #bins in phi0
  //pt_min = mimium Pt of track (corresponding to maximum kappa)
  //phi_min = mimimum phi0 (degrees)
  //phi_max = maximum phi0 (degrees)
    
  AliL3FFloat x = AliL3Transform::GetBFieldValue()/pt_min;
  AliL3FFloat torad = AliL3Transform::Pi()/180;
  AliL3FFloat phimin_=phimin*torad;
  AliL3FFloat phimax_=phimax*torad;

  CreateHistograms(nxbin,-x,x,nybin,phimin_,phimax_);
}

void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t xmin,Double_t xmax,
					         Int_t nybin,Double_t ymin,Double_t ymax)
{

  AliL3FFloat xminf=xmin;
  AliL3FFloat xmaxf=xmax;
  AliL3FFloat yminf=ymin;
  AliL3FFloat ymaxf=ymax;
  /*
  cout << xminf << endl;
  cout << xmaxf << " " << ((xmaxf-xminf)/nxbin) << endl;
  cout << yminf << endl;
  cout << ymaxf << " " << ((ymaxf-yminf)/nybin) << endl;
  */

  fParamSpace = new AliL3Histogram*[GetNEtaSegments()];
  Char_t histname[256];
  for(Int_t i=0; i<GetNEtaSegments(); i++)
    {
      sprintf(histname,"paramspace_vhdl_%d",i);
      fParamSpace[i] = new AliL3Histogram(histname,"",nxbin,xminf,xmaxf,nybin,yminf,ymaxf);
    }
  
  //create lookup table for sin and cos
  fNPhi0=nybin+1;
#ifndef VHDLSTATIC
  fLUTphi0=new AliL3FFloat[fNPhi0];
  fLUT2sinphi0=new AliL3FFloat[fNPhi0];
  fLUT2cosphi0=new AliL3FFloat[fNPhi0];
#endif
  AliL3FFloat diff=(ymax-ymin)/nybin;
  AliL3FFloat phi0=ymin-0.5*diff;
  for(Int_t i=0; i<fNPhi0; i++){
    phi0+=diff;
    fLUTphi0[i]=phi0;
    fLUT2sinphi0[i]=Float_t(2*sin(phi0));
    fLUT2cosphi0[i]=Float_t(2*cos(phi0));
    //VESTBO: uncomment to see values (and compare with Print function)
    //cout << i << ": " << fLUTphi0[i] << " " << fLUT2sinphi0[i] << " " << fLUT2cosphi0[i] << endl;
  }  
}

void AliL3HoughTransformerVhdl::Reset()
{
  //Reset all the histograms

  if(!fParamSpace)
    {
      LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::Reset","Histograms")
	<<"No histograms to reset"<<ENDLOG;
      return;
    }
  
  for(Int_t i=0; i<GetNEtaSegments(); i++)
    fParamSpace[i]->Reset();
}

inline AliL3Histogram *AliL3HoughTransformerVhdl::GetHistogram(Int_t eta_index)
{
  if(!fParamSpace || eta_index >= GetNEtaSegments() || eta_index < 0) return 0;
  if(!fParamSpace[eta_index]) return 0;
  return fParamSpace[eta_index];
}

inline Int_t AliL3HoughTransformerVhdl::FindIndex(Double_t rz2)
{
  Int_t index=0;
  while((index<fNEtas)&&(rz2<=fLUTEta[index])){
    index++;
    //cout << index << ": " << rz2 << " " << fLUTEta[index] << endl;
  }
  return index;
}

Int_t AliL3HoughTransformerVhdl::GetEtaIndex(Double_t eta)
{
  AliL3FFloat rz2=CalcRoverZ2(eta);
  return FindIndex(rz2);
}

Double_t AliL3HoughTransformerVhdl::GetEta(Int_t eta_index,Int_t slice){
  if(eta_index >= fNEtas || eta_index < 0){
    LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::GetEta","Index")
      <<"Index out of range."<<ENDLOG;
    return 0.;
  }
  return (CalcEta(fLUTEta[eta_index])-0.5*fEtaSlice);
}

void AliL3HoughTransformerVhdl::TransformCircle()
{
  //Transform the input data with a circle HT.
  //The function loops over all the data, and transforms each pixel with the equations:
  // 
  //kappa = 1/x * ( y/x*2*cos(phi0) - 2*sin(phi0) )

  AliL3DigitRowData *tempPt = GetDataPointer();
  if(!tempPt)
    {
      LOG(AliL3Log::kError,"AliL3HoughTransformerVhdl::TransformCircle","Data")
	<<"No input data "<<ENDLOG;
      return;
    }

  AliL3FFloat x=0.,y=0.,z=0.,rz2=0.;
  //Loop over the padrows:
   for(Int_t i=fMinRow, row=0; i<=fMaxRow; i++, row++){

    //Get the data on this padrow:
    AliL3DigitData *digPt = tempPt->fDigitData;
    if(i != (Int_t)tempPt->fRow){
      LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Padrows")
	<<"Mismatching padrow numbering "<<i<<"!="<<(Int_t)tempPt->fRow<<ENDLOG;
      continue;
    }
      
    //Loop over the data on this padrow:
    for(UInt_t j=0; j<tempPt->fNDigit; j++){
      Int_t charge = digPt[j].fCharge;
      if((Int_t)charge <= GetLowerThreshold()) continue;
      
      Int_t pad = digPt[j].fPad;
      Int_t time = digPt[j].fTime;

      x=CalcX(row);
      y=CalcY(pad,row);
      z=CalcZ(time);

      //find eta slice
      rz2=1+(x*x+y*y)/z/z;
      Int_t eta_index = FindIndex(rz2);
      if(eta_index < 0 || eta_index >= GetNEtaSegments()){
	//LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"No histograms corresponding to eta index value of "<<eta_index<<"."<<ENDLOG;
	continue;
      }	  
      //Get the correct histogrampointer:
      AliL3Histogram *hist = fParamSpace[eta_index];
      if(!hist){
	//LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"Error getting histogram in index "<<eta_index<<"."<<ENDLOG;
	continue;
      }

      //Fill the histogram along the phirange
      AliL3FFloat kappa,ydx=y/x;
      for(Int_t b=0; b<fNPhi0; b++){
	kappa=ydx*fLUT2cosphi0[b]-fLUT2sinphi0[b];
	kappa/=x;
	hist->Fill(kappa,fLUTphi0[b],charge);
	//cout << kappa << " " << fLUTphi0[b] << " " << charge << endl;
      }

    }
    //Move the data pointer to the next padrow:
    AliL3MemHandler::UpdateRowPointer(tempPt);
  }
}

void AliL3HoughTransformerVhdl::Print()
{
  cout << "fSlice: " << GetSlice() << endl;
  cout << "fPatch: " << GetPatch() << endl;
  cout << "fSector: " << fSector << endl;
  cout << "fSectorRow: " << fSectorRow << endl;
  cout << "fMinRow: " << fMinRow << endl;
  cout << "fMaxRow: " << fMaxRow << endl;
  cout << "fNRows: " << fNRows << endl;
  cout << "fNEtas: " << fNEtas << endl;
  cout << "fNPhi0: " << fNPhi0 << endl;
  cout << "fZSign: " << fZSign << endl;
  cout << "fZLengthPlusOff: " << fZLengthPlusOff << endl;
  cout << "fPadPitch: " << fPadPitch << endl;
  cout << "fTimeWidth: " << fTimeWidth << endl;
  if(!fNRows) return;
  cout << "fLUTX " << fNRows << endl;
  for(Int_t i=0;i<fNRows;i++) cout << "fLUTX[" << i << "]=" << (Float_t)fLUTX[i] << endl;
  cout << "fLUTY " << fNRows << endl;
  for(Int_t i=0;i<fNRows;i++) cout << "fLUTY[" << i << "]=" << fLUTY[i] << endl;
  if(!fNEtas) return;
  cout << "fLUTEta " << fNEtas << endl;
  for(Int_t i=0;i<fNEtas;i++) cout << "fLUTEta[" << i << "]=" << fLUTEta[i] << endl;
  if(!fNPhi0) return;
  cout << "fLUTphi0 " << fNPhi0 << endl;
  for(Int_t i=0;i<fNPhi0;i++) cout << "fLUTPhi0[" << i << "]=" << fLUTphi0[i] << endl;
  cout << "fLUT2sinphi0 " << fNPhi0 << endl;
  for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2sinphi0[" << i << "]=" << fLUT2sinphi0[i] << endl;
  cout << "fLUT2cosphi0 " << fNPhi0 << endl;
  for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2cosphi0[" << i << "]=" << fLUT2cosphi0[i] << endl;
}

//end vhdl version
#else 
//standard version

AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl()
{
  fParamSpace=0;
}

AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl(Int_t slice,Int_t patch,Int_t n_eta_segments) 
            : AliL3HoughBaseTransformer(slice,patch,n_eta_segments)
{
  fParamSpace=0;
}

AliL3HoughTransformerVhdl::~AliL3HoughTransformerVhdl()
{
  DeleteHistograms();
}

void AliL3HoughTransformerVhdl::DeleteHistograms()
{
  if(!fParamSpace)
    return;
  for(Int_t i=0; i<GetNEtaSegments(); i++)
    {
      if(!fParamSpace[i]) continue;
      delete fParamSpace[i];
    }
  delete[] fParamSpace;
}

void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t pt_min,Int_t nybin,Double_t phimin,Double_t phimax)
{
  //Create the histograms (parameter space).
  //These are 2D histograms, span by kappa (curvature of track) and phi0 (emission angle with x-axis).
  //The arguments give the range and binning; 
  //nxbin = #bins in kappa
  //nybin = #bins in phi0
  //pt_min = mimium Pt of track (corresponding to maximum kappa)
  //phi_min = mimimum phi0 (degrees)
  //phi_max = maximum phi0 (degrees)
    
  Double_t x = AliL3Transform::GetBFieldValue()/pt_min;
  Double_t torad = AliL3Transform::Pi()/180;

  CreateHistograms(nxbin,-1.*x,x,nybin,phimin*torad,phimax*torad);
}

void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t xmin,Double_t xmax,
					         Int_t nybin,Double_t ymin,Double_t ymax)
{

  AliL3FFloat xminf(xmin);
  AliL3FFloat xmaxf(xmax);
  AliL3FFloat yminf(ymin);
  AliL3FFloat ymaxf(ymax);
  /*
  cout << xminf << endl;
  cout << xmaxf << " " << ((xmaxf-xminf)/nxbin) << endl;
  cout << yminf << endl;
  cout << ymaxf << " " << ((ymaxf-yminf)/nybin) << endl;
  */
  
  fParamSpace = new AliL3Histogram*[GetNEtaSegments()];
  
  Char_t histname[256];
  for(Int_t i=0; i<GetNEtaSegments(); i++)
    {
      sprintf(histname,"paramspace_vhdl_%d",i);
      fParamSpace[i] = new AliL3Histogram(histname,"",nxbin,xminf,xmaxf,nybin,yminf,ymaxf);
    }
}

void AliL3HoughTransformerVhdl::Reset()
{
  //Reset all the histograms

  if(!fParamSpace)
    {
      LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::Reset","Histograms")
	<<"No histograms to reset"<<ENDLOG;
      return;
    }
  
  for(Int_t i=0; i<GetNEtaSegments(); i++)
    fParamSpace[i]->Reset();
}

inline AliL3Histogram *AliL3HoughTransformerVhdl::GetHistogram(Int_t eta_index)
{
  if(!fParamSpace || eta_index >= GetNEtaSegments() || eta_index < 0) return 0;
  if(!fParamSpace[eta_index]) return 0;
  return fParamSpace[eta_index];
}

Int_t AliL3HoughTransformerVhdl::GetEtaIndex(Double_t eta)
{
  //Return the histogram index of the corresponding eta. 
  AliL3FFloat etaslice = (GetEtaMax() - GetEtaMin())/GetNEtaSegments();
  AliL3FFloat index = (eta-GetEtaMin())/etaslice;

  //if((Int_t)index==0) cout << index << " " << (Int_t) index << endl;
  return (Int_t)index;
}

Double_t AliL3HoughTransformerVhdl::GetEta(Int_t eta_index)
{
  if(eta_index >= GetNEtaSegments() || eta_index < 0){
    return 0;
  }
  Double_t eta_slice = (GetEtaMax()-GetEtaMin())/GetNEtaSegments();
  Double_t eta=(Double_t)((eta_index+0.5)*eta_slice);
  if(GetSlice()>17) eta*=-1;
  return eta;
}

void AliL3HoughTransformerVhdl::TransformCircle()
{
  //Transform the input data with a circle HT.
  //The function loops over all the data, and transforms each pixel with the equations:
  // 
  //kappa = 2/R*sin(phi - phi0)
  //
  //where R = sqrt(x*x +y*y), and phi = arctan(y/x)
  //
  //Each pixel then transforms into a curve in the (kappa,phi0)-space. In order to find
  //which histogram in which the pixel should be transformed, the eta-value is calcluated
  //and the proper histogram index is found by GetEtaIndex(eta).


  AliL3DigitRowData *tempPt = GetDataPointer();
  if(!tempPt)
    {
      LOG(AliL3Log::kError,"AliL3HoughTransformerVhdl::TransformCircle","Data")
	<<"No input data "<<ENDLOG;
      return;
    }
  
  //Loop over the padrows:
  for(Int_t i=AliL3Transform::GetFirstRow(GetPatch()); i<=AliL3Transform::GetLastRow(GetPatch()); i++)
    {
      //Get the data on this padrow:
      AliL3DigitData *digPt = tempPt->fDigitData;
      if(i != (Int_t)tempPt->fRow)
	{
      LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Padrows")
	<<"Mismatching padrow numbering."<<ENDLOG;
	  continue;
	}
      

      //Loop over the data on this padrow:
      for(UInt_t j=0; j<tempPt->fNDigit; j++)
	{
	  UShort_t charge = digPt[j].fCharge;
	  if((Int_t)charge <= GetLowerThreshold()) continue;

	  UChar_t pad = digPt[j].fPad;
	  UShort_t time = digPt[j].fTime;

	  Int_t sector,row;
	  Float_t xyz[3];
	  AliL3FFloat fxyz[3];

	  //Transform data to local cartesian coordinates:
	  AliL3Transform::Slice2Sector(GetSlice(),i,sector,row);
	  AliL3Transform::Raw2Local(xyz,sector,row,(Int_t)pad,(Int_t)time);

	  //trunc to fixed format.
	  for(int i=0;i<3;i++) {
	    fxyz[i]=xyz[i];
	    //cout << fxyz[i];
	    xyz[i]=fxyz[i];
	  }
	  //cout << endl;

	  //Calculate the eta:
	  AliL3FFloat eta = AliL3Transform::GetEta(xyz);
	  
	  //Get the corresponding index, which determines which histogram to fill:
	  Int_t eta_index = GetEtaIndex(eta);
	  if(eta_index < 0 || eta_index >= GetNEtaSegments()){
	    //LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"No histograms corresponding to eta index value of "<<eta_index<<"."<<ENDLOG;
	    continue;
	  }	  
	  //Get the correct histogrampointer:
	  AliL3Histogram *hist = fParamSpace[eta_index];
	  if(!hist)
	    {
	      //LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"Error getting histogram in index "<<eta_index<<"."<<ENDLOG;
	      continue;
	    }

	  //Do the transformation:
	  AliL3FFloat R = sqrt(fxyz[0]*fxyz[0] + fxyz[1]*fxyz[1]); 
	  AliL3FFloat phi = AliL3Transform::GetPhi(xyz);
	  
	  //Fill the histogram along the phirange
	  for(Int_t b=hist->GetFirstYbin(); b<=hist->GetLastYbin(); b++)
	    {
	      AliL3FFloat phi0 = hist->GetBinCenterY(b);
	      AliL3FFloat kappa = 2*sin(phi - phi0)/R;
	      //hist->Fill(kappa.GetExactVal(),phi0.GetExactVal(),charge);
	      hist->Fill(kappa,phi0,charge);
	    }
	}
      
      //Move the data pointer to the next padrow:
      AliL3MemHandler::UpdateRowPointer(tempPt);
    }
}

#endif
Commit	Line	Data
b46b53c1	1	//$Id$
	2
	3	// Author: Constantin Loizides <mailto:loizides@fi.uib.no>
6173606e	4	//*-- Copyright&Copy CL
	5
	6	#include <stream.h>
b46b53c1	7
	8	#include "AliL3MemHandler.h"
	9	#include "AliL3Logging.h"
	10	#include "AliL3Transform.h"
	11	#include "AliL3DigitData.h"
	12	#include "AliL3Histogram.h"
6173606e	13
	14
	15	//try to be close to VHDL version (eg. LUTs)
	16	//VESTBO: if you switch that of, you should get your version
	17	//of the transformer!!!
	18	#define VHDLVERSION
	19
	20	//dont use dynamic objects on heap
	21	//VESTBO: this a desperately switched on in order
	22	//to find the bug, which i thought hat something
	23	//to do with a wrong heap assignment! But the
	24	//data still gets overwritten!
	25	#define VHDLSTATIC
	26
	27	//switch off if you want to have floating point
	28	//#define USEFFLOAT
b46b53c1	29	#include "AliL3HoughTransformerVhdl.h"
b46b53c1	30
6173606e	31	/** \class AliL3HoughTransformerVhdl
6173606e	32	// <pre>
b46b53c1	33	//_____________________________________________________________
	34	// AliL3HoughTransformerVhdl
	35	//
6173606e	36	// Hough transformation class for VHDL comparism.
b46b53c1	37	//
6173606e	38	//</pre>
6173606e	39	*/
b46b53c1	40
	41	ClassImp(AliL3HoughTransformerVhdl)
	42
6173606e	43	#ifdef VHDLVERSION
6173606e	44
b46b53c1	45	AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl()
6173606e	46	: AliL3HoughBaseTransformer()
b46b53c1	47	{
6173606e	48	fParamSpace=0;
	49	#ifndef VHDLSTATIC
	50	fLUTX=0;
	51	fLUTY=0;
	52	fLUTEta=0;
	53	fLUTphi0=0;
	54	fLUT2sinphi0=0;
	55	fLUT2cosphi0=0;
	56	#endif
	57	fMinRow=0;
	58	fMaxRow=0;
	59	fNRows=0;
	60	fNEtas=0;
	61	fNPhi0=0;
	62	fSector=0;
	63	fSectorRow=0;
	64	fZSign=0;
	65	fZLengthPlusOff=0.;
	66	fTimeWidth=0.;
	67	fPadPitch=0.;
	68	fEtaSlice=0.;
b46b53c1	69	}
b46b53c1	70
6173606e	71	AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl(Int_t slice,Int_t patch,Int_t n_eta_segments)
6173606e	72	: AliL3HoughBaseTransformer(slice,patch,n_eta_segments)
b46b53c1	73	{
6173606e	74	AliL3HoughTransformerVhdl();
	75
	76	Init(slice,patch,n_eta_segments);
	77	}
	78
	79	AliL3HoughTransformerVhdl::~AliL3HoughTransformerVhdl()
	80	{
	81	DeleteHistograms();
	82
	83	#ifndef VHDLSTATIC
	84	if(fNRows){
	85	delete[] fLUTX;
	86	delete[] fLUTY;
	87	}
	88	if(fNEtas) delete[] fLUTEta;
	89	#endif
	90	}
	91
	92	void AliL3HoughTransformerVhdl::Init(Int_t slice=0,Int_t patch=0,Int_t n_eta_segments=100)
	93	{
	94	cout << "InitVhdl " << slice << " " << patch << " " << n_eta_segments << endl;
	95	AliL3HoughBaseTransformer::Init(slice,patch,n_eta_segments);
	96
	97	#ifndef VHDLSTATIC
	98	//delete old LUT tables
	99	if(fNRows){
	100	fNRows=0;
	101	delete[] fLUTX;
	102	delete[] fLUTY;
	103	}
	104	if(fNEtas){
	105	delete[] fLUTEta;
	106	fNEtas=0;
	107	}
	108	#endif
	109
	110	//set when histogram is filled
	111	//fLUTphi0=0;
	112	//fLUT2sinphi0=0;
	113	//fLUT2cosphi0=0;
	114
	115	Int_t minrow_=AliL3Transform::GetFirstRow(patch);
	116	Int_t maxrow_=AliL3Transform::GetLastRow(patch);
	117	Int_t n_=AliL3Transform::GetNRows(patch);
	118	Int_t sector_=0,sectorrow_=0;
	119	AliL3Transform::Slice2Sector(slice,minrow_,sector_,sectorrow_);
	120	Float_t padpitch_=0.;
	121	if(sector_<AliL3Transform::GetNSectorLow())
	122	padpitch_=AliL3Transform::GetPadPitchWidthLow();
	123	else
	124	padpitch_=AliL3Transform::GetPadPitchWidthUp();
	125
	126	Float_t etamax_=GetEtaMax();
	127	Float_t etamin_=GetEtaMin();
	128	Float_t etaslice_=(etamax_-etamin_)/n_eta_segments;
	129
	130	//lookup tables for X and Y
	131	#ifndef VHDLSTATIC
	132	fLUTX=new AliL3FFloat[n_];
	133	fLUTY=new AliL3FFloat[n_];
	134	#endif
	135	for(Int_t rr=0;rr<n_;rr++){
	136	fLUTX[rr]=Float_t(AliL3Transform::Row2X(rr+minrow_));
	137	fLUTY[rr]=Float_t(0.5(AliL3Transform::GetNPads(rr+minrow_)-1)padpitch_);
138	//VESTBO: uncomment to see values (and compare with Print function)
139	//cout << rr << ": " << (Float_t)fLUTX[rr] << " " << (Float_t)fLUTY[rr] << endl;
140	}
141
142	//lookup tables for rz2s <=> etas
143	#ifndef VHDLSTATIC
144	fLUTEta=new AliL3FFloat[n_eta_segments];
145	#endif
146	for(Int_t rr=0;rr<n_eta_segments;rr++){
147	fLUTEta[rr]=CalcRoverZ2(etamin_+(rr+1)*etaslice_);
148	//VESTBO: uncomment to see values (and compare with Print function)
149	//cout << rr << ": " << fLUTEta[rr] << endl;
150	}
151
152	//member values
153	fMinRow=minrow_;
154	fMaxRow=maxrow_;
155	fNRows=n_;
156	fNEtas=n_eta_segments;
157	fNPhi0=0;
158	fSector=sector_;
159	fSectorRow=sectorrow_;
160	fZSign = slice < 18 ? 1:-1;
161	fZLengthPlusOff=AliL3Transform::GetZLength()+AliL3Transform::GetZOffset();
162	fTimeWidth=AliL3Transform::GetZWidth();
163	fPadPitch=padpitch_;
164	fEtaSlice=etaslice_;
165	}
166
167	Float_t AliL3HoughTransformerVhdl::CalcRoverZ2(Float_t eta)
168	{
169	Float_t e=exp(2*eta);
170	Float_t ret=(e+1)/(e-1);
171	ret*=ret;
172	return ret;
173	}
174
175	Float_t AliL3HoughTransformerVhdl::CalcEta(Float_t roverz2)
176	{
177	Float_t rz=sqrt(roverz2);
178	if(fZSign>0) rz=-rz;
179	Float_t ret=(1+rz)/(rz-1);
180	ret=0.5*log(ret);
181	return ret;
182	}
183
184	inline Float_t AliL3HoughTransformerVhdl::CalcX(Int_t row)
185	{
186	return fLUTX[row];
187	}
188
189	inline Float_t AliL3HoughTransformerVhdl::CalcY(Int_t pad,Int_t row)
190	{
191	return pad*fPadPitch-fLUTY[row];
192	}
193
194	inline Float_t AliL3HoughTransformerVhdl::CalcZ(Int_t time)
195	{
196	Float_t ret=time*fTimeWidth;
197	if(fZSign>0) ret=fZLengthPlusOff-ret;
198	else ret=ret-fZLengthPlusOff;
199	return ret;
200	}
201
202	void AliL3HoughTransformerVhdl::DeleteHistograms()
203	{
204	if(!fParamSpace) return;
205	for(Int_t i=0; i<GetNEtaSegments(); i++){
206	if(!fParamSpace[i]) continue;
207	delete fParamSpace[i];
208	}
209	delete[] fParamSpace;
210
211	#ifndef VHDLSTATIC
212	if(fNPhi0){
213	fNPhi0=0;
214	delete[] fLUT2sinphi0;
215	delete[] fLUT2cosphi0;
216	delete[] fLUTphi0;
217	}
218	#endif
219	}
220
221	void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t pt_min,Int_t nybin,Double_t phimin,Double_t phimax)
222	{
223	//Create the histograms (parameter space).
224	//These are 2D histograms, span by kappa (curvature of track) and phi0 (emission angle with x-axis).
225	//The arguments give the range and binning;
226	//nxbin = #bins in kappa
227	//nybin = #bins in phi0
228	//pt_min = mimium Pt of track (corresponding to maximum kappa)
229	//phi_min = mimimum phi0 (degrees)
230	//phi_max = maximum phi0 (degrees)
231
232	AliL3FFloat x = AliL3Transform::GetBFieldValue()/pt_min;
233	AliL3FFloat torad = AliL3Transform::Pi()/180;
234	AliL3FFloat phimin_=phimin*torad;
235	AliL3FFloat phimax_=phimax*torad;
236
237	CreateHistograms(nxbin,-x,x,nybin,phimin_,phimax_);
238	}
239
240	void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t xmin,Double_t xmax,
241	Int_t nybin,Double_t ymin,Double_t ymax)
242	{
243
244	AliL3FFloat xminf=xmin;
245	AliL3FFloat xmaxf=xmax;
246	AliL3FFloat yminf=ymin;
247	AliL3FFloat ymaxf=ymax;
248	/*
249	cout << xminf << endl;
250	cout << xmaxf << " " << ((xmaxf-xminf)/nxbin) << endl;
251	cout << yminf << endl;
252	cout << ymaxf << " " << ((ymaxf-yminf)/nybin) << endl;
253	*/
254
255	fParamSpace = new AliL3Histogram*[GetNEtaSegments()];
256	Char_t histname[256];
257	for(Int_t i=0; i<GetNEtaSegments(); i++)
258	{
259	sprintf(histname,"paramspace_vhdl_%d",i);
260	fParamSpace[i] = new AliL3Histogram(histname,"",nxbin,xminf,xmaxf,nybin,yminf,ymaxf);
261	}
262
263	//create lookup table for sin and cos
264	fNPhi0=nybin+1;
265	#ifndef VHDLSTATIC
266	fLUTphi0=new AliL3FFloat[fNPhi0];
267	fLUT2sinphi0=new AliL3FFloat[fNPhi0];
268	fLUT2cosphi0=new AliL3FFloat[fNPhi0];
269	#endif
270	AliL3FFloat diff=(ymax-ymin)/nybin;
271	AliL3FFloat phi0=ymin-0.5*diff;
272	for(Int_t i=0; i<fNPhi0; i++){
273	phi0+=diff;
274	fLUTphi0[i]=phi0;
275	fLUT2sinphi0[i]=Float_t(2*sin(phi0));
276	fLUT2cosphi0[i]=Float_t(2*cos(phi0));
277	//VESTBO: uncomment to see values (and compare with Print function)
278	//cout << i << ": " << fLUTphi0[i] << " " << fLUT2sinphi0[i] << " " << fLUT2cosphi0[i] << endl;
279	}
280	}
281
282	void AliL3HoughTransformerVhdl::Reset()
283	{
284	//Reset all the histograms
285
286	if(!fParamSpace)
287	{
288	LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::Reset","Histograms")
289	<<"No histograms to reset"<<ENDLOG;
290	return;
291	}
292
293	for(Int_t i=0; i<GetNEtaSegments(); i++)
294	fParamSpace[i]->Reset();
295	}
296
297	inline AliL3Histogram *AliL3HoughTransformerVhdl::GetHistogram(Int_t eta_index)
298	{
299	if(!fParamSpace \|\| eta_index >= GetNEtaSegments() \|\| eta_index < 0) return 0;
300	if(!fParamSpace[eta_index]) return 0;
301	return fParamSpace[eta_index];
302	}
303
304	inline Int_t AliL3HoughTransformerVhdl::FindIndex(Double_t rz2)
305	{
306	Int_t index=0;
307	while((index<fNEtas)&&(rz2<=fLUTEta[index])){
308	index++;
309	//cout << index << ": " << rz2 << " " << fLUTEta[index] << endl;
310	}
311	return index;
312	}
313
314	Int_t AliL3HoughTransformerVhdl::GetEtaIndex(Double_t eta)
315	{
316	AliL3FFloat rz2=CalcRoverZ2(eta);
317	return FindIndex(rz2);
318	}
319
afd8fed4	320	Double_t AliL3HoughTransformerVhdl::GetEta(Int_t eta_index,Int_t slice){
6173606e	321	if(eta_index >= fNEtas \|\| eta_index < 0){
	322	LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::GetEta","Index")
	323	<<"Index out of range."<<ENDLOG;
	324	return 0.;
	325	}
	326	return (CalcEta(fLUTEta[eta_index])-0.5*fEtaSlice);
	327	}
	328
	329	void AliL3HoughTransformerVhdl::TransformCircle()
	330	{
	331	//Transform the input data with a circle HT.
	332	//The function loops over all the data, and transforms each pixel with the equations:
	333	//
	334	//kappa = 1/x * ( y/x2cos(phi0) - 2*sin(phi0) )
	335
	336	AliL3DigitRowData *tempPt = GetDataPointer();
	337	if(!tempPt)
	338	{
	339	LOG(AliL3Log::kError,"AliL3HoughTransformerVhdl::TransformCircle","Data")
	340	<<"No input data "<<ENDLOG;
	341	return;
	342	}
	343
	344	AliL3FFloat x=0.,y=0.,z=0.,rz2=0.;
	345	//Loop over the padrows:
	346	for(Int_t i=fMinRow, row=0; i<=fMaxRow; i++, row++){
	347
	348	//Get the data on this padrow:
	349	AliL3DigitData *digPt = tempPt->fDigitData;
	350	if(i != (Int_t)tempPt->fRow){
	351	LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Padrows")
	352	<<"Mismatching padrow numbering "<<i<<"!="<<(Int_t)tempPt->fRow<<ENDLOG;
	353	continue;
	354	}
	355
	356	//Loop over the data on this padrow:
	357	for(UInt_t j=0; j<tempPt->fNDigit; j++){
	358	Int_t charge = digPt[j].fCharge;
	359	if((Int_t)charge <= GetLowerThreshold()) continue;
	360
	361	Int_t pad = digPt[j].fPad;
	362	Int_t time = digPt[j].fTime;
	363
	364	x=CalcX(row);
	365	y=CalcY(pad,row);
	366	z=CalcZ(time);
	367
	368	//find eta slice
	369	rz2=1+(xx+yy)/z/z;
	370	Int_t eta_index = FindIndex(rz2);
	371	if(eta_index < 0 \|\| eta_index >= GetNEtaSegments()){
	372	//LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"No histograms corresponding to eta index value of "<<eta_index<<"."<<ENDLOG;
	373	continue;
	374	}
	375	//Get the correct histogrampointer:
	376	AliL3Histogram *hist = fParamSpace[eta_index];
	377	if(!hist){
	378	//LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"Error getting histogram in index "<<eta_index<<"."<<ENDLOG;
	379	continue;
	380	}
	381
	382	//Fill the histogram along the phirange
	383	AliL3FFloat kappa,ydx=y/x;
	384	for(Int_t b=0; b<fNPhi0; b++){
385	kappa=ydx*fLUT2cosphi0[b]-fLUT2sinphi0[b];
386	kappa/=x;
387	hist->Fill(kappa,fLUTphi0[b],charge);
388	//cout << kappa << " " << fLUTphi0[b] << " " << charge << endl;
389	}
390
391	}
392	//Move the data pointer to the next padrow:
393	AliL3MemHandler::UpdateRowPointer(tempPt);
394	}
395	}
396
397	void AliL3HoughTransformerVhdl::Print()
398	{
399	cout << "fSlice: " << GetSlice() << endl;
400	cout << "fPatch: " << GetPatch() << endl;
401	cout << "fSector: " << fSector << endl;
402	cout << "fSectorRow: " << fSectorRow << endl;
403	cout << "fMinRow: " << fMinRow << endl;
404	cout << "fMaxRow: " << fMaxRow << endl;
405	cout << "fNRows: " << fNRows << endl;
406	cout << "fNEtas: " << fNEtas << endl;
407	cout << "fNPhi0: " << fNPhi0 << endl;
408	cout << "fZSign: " << fZSign << endl;
409	cout << "fZLengthPlusOff: " << fZLengthPlusOff << endl;
410	cout << "fPadPitch: " << fPadPitch << endl;
411	cout << "fTimeWidth: " << fTimeWidth << endl;
412	if(!fNRows) return;
413	cout << "fLUTX " << fNRows << endl;
414	for(Int_t i=0;i<fNRows;i++) cout << "fLUTX[" << i << "]=" << (Float_t)fLUTX[i] << endl;
415	cout << "fLUTY " << fNRows << endl;
416	for(Int_t i=0;i<fNRows;i++) cout << "fLUTY[" << i << "]=" << fLUTY[i] << endl;
417	if(!fNEtas) return;
418	cout << "fLUTEta " << fNEtas << endl;
419	for(Int_t i=0;i<fNEtas;i++) cout << "fLUTEta[" << i << "]=" << fLUTEta[i] << endl;
420	if(!fNPhi0) return;
421	cout << "fLUTphi0 " << fNPhi0 << endl;
422	for(Int_t i=0;i<fNPhi0;i++) cout << "fLUTPhi0[" << i << "]=" << fLUTphi0[i] << endl;
423	cout << "fLUT2sinphi0 " << fNPhi0 << endl;
424	for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2sinphi0[" << i << "]=" << fLUT2sinphi0[i] << endl;
425	cout << "fLUT2cosphi0 " << fNPhi0 << endl;
426	for(Int_t i=0;i<fNPhi0;i++) cout << "fLUT2cosphi0[" << i << "]=" << fLUT2cosphi0[i] << endl;
427	}
428
429	//end vhdl version
430	#else
431	//standard version
432
433	AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl()
434	{
435	fParamSpace=0;
436	}
437
438	AliL3HoughTransformerVhdl::AliL3HoughTransformerVhdl(Int_t slice,Int_t patch,Int_t n_eta_segments)
439	: AliL3HoughBaseTransformer(slice,patch,n_eta_segments)
440	{
441	fParamSpace=0;
b46b53c1	442	}
	443
	444	AliL3HoughTransformerVhdl::~AliL3HoughTransformerVhdl()
	445	{
	446	DeleteHistograms();
	447	}
	448
	449	void AliL3HoughTransformerVhdl::DeleteHistograms()
	450	{
	451	if(!fParamSpace)
	452	return;
	453	for(Int_t i=0; i<GetNEtaSegments(); i++)
	454	{
	455	if(!fParamSpace[i]) continue;
	456	delete fParamSpace[i];
	457	}
6173606e	458	delete[] fParamSpace;
b46b53c1	459	}
b46b53c1	460
6173606e	461	void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t pt_min,Int_t nybin,Double_t phimin,Double_t phimax)
b46b53c1	462	{
	463	//Create the histograms (parameter space).
	464	//These are 2D histograms, span by kappa (curvature of track) and phi0 (emission angle with x-axis).
	465	//The arguments give the range and binning;
	466	//nxbin = #bins in kappa
	467	//nybin = #bins in phi0
	468	//pt_min = mimium Pt of track (corresponding to maximum kappa)
	469	//phi_min = mimimum phi0 (degrees)
	470	//phi_max = maximum phi0 (degrees)
	471
6173606e	472	Double_t x = AliL3Transform::GetBFieldValue()/pt_min;
b46b53c1	473	Double_t torad = AliL3Transform::Pi()/180;
6173606e	474
b46b53c1	475	CreateHistograms(nxbin,-1.x,x,nybin,phimintorad,phimax*torad);
	476	}
	477
	478	void AliL3HoughTransformerVhdl::CreateHistograms(Int_t nxbin,Double_t xmin,Double_t xmax,
6173606e	479	Int_t nybin,Double_t ymin,Double_t ymax)
b46b53c1	480	{
6173606e	481
	482	AliL3FFloat xminf(xmin);
	483	AliL3FFloat xmaxf(xmax);
	484	AliL3FFloat yminf(ymin);
	485	AliL3FFloat ymaxf(ymax);
	486	/*
	487	cout << xminf << endl;
	488	cout << xmaxf << " " << ((xmaxf-xminf)/nxbin) << endl;
	489	cout << yminf << endl;
	490	cout << ymaxf << " " << ((ymaxf-yminf)/nybin) << endl;
	491	*/
b46b53c1	492
	493	fParamSpace = new AliL3Histogram*[GetNEtaSegments()];
	494
	495	Char_t histname[256];
	496	for(Int_t i=0; i<GetNEtaSegments(); i++)
	497	{
6173606e	498	sprintf(histname,"paramspace_vhdl_%d",i);
6173606e	499	fParamSpace[i] = new AliL3Histogram(histname,"",nxbin,xminf,xmaxf,nybin,yminf,ymaxf);
b46b53c1	500	}
	501	}
	502
	503	void AliL3HoughTransformerVhdl::Reset()
	504	{
	505	//Reset all the histograms
	506
	507	if(!fParamSpace)
	508	{
	509	LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::Reset","Histograms")
	510	<<"No histograms to reset"<<ENDLOG;
	511	return;
	512	}
	513
	514	for(Int_t i=0; i<GetNEtaSegments(); i++)
	515	fParamSpace[i]->Reset();
	516	}
	517
6173606e	518	inline AliL3Histogram *AliL3HoughTransformerVhdl::GetHistogram(Int_t eta_index)
	519	{
	520	if(!fParamSpace \|\| eta_index >= GetNEtaSegments() \|\| eta_index < 0) return 0;
	521	if(!fParamSpace[eta_index]) return 0;
	522	return fParamSpace[eta_index];
	523	}
b46b53c1	524
	525	Int_t AliL3HoughTransformerVhdl::GetEtaIndex(Double_t eta)
	526	{
	527	//Return the histogram index of the corresponding eta.
6173606e	528	AliL3FFloat etaslice = (GetEtaMax() - GetEtaMin())/GetNEtaSegments();
6173606e	529	AliL3FFloat index = (eta-GetEtaMin())/etaslice;
b46b53c1	530
6173606e	531	//if((Int_t)index==0) cout << index << " " << (Int_t) index << endl;
b46b53c1	532	return (Int_t)index;
	533	}
	534
6173606e	535	Double_t AliL3HoughTransformerVhdl::GetEta(Int_t eta_index)
	536	{
	537	if(eta_index >= GetNEtaSegments() \|\| eta_index < 0){
	538	return 0;
	539	}
	540	Double_t eta_slice = (GetEtaMax()-GetEtaMin())/GetNEtaSegments();
	541	Double_t eta=(Double_t)((eta_index+0.5)*eta_slice);
	542	if(GetSlice()>17) eta*=-1;
	543	return eta;
	544	}
	545
b46b53c1	546	void AliL3HoughTransformerVhdl::TransformCircle()
	547	{
	548	//Transform the input data with a circle HT.
	549	//The function loops over all the data, and transforms each pixel with the equations:
	550	//
	551	//kappa = 2/R*sin(phi - phi0)
	552	//
	553	//where R = sqrt(xx +yy), and phi = arctan(y/x)
	554	//
	555	//Each pixel then transforms into a curve in the (kappa,phi0)-space. In order to find
	556	//which histogram in which the pixel should be transformed, the eta-value is calcluated
	557	//and the proper histogram index is found by GetEtaIndex(eta).
	558
	559
	560	AliL3DigitRowData *tempPt = GetDataPointer();
	561	if(!tempPt)
	562	{
	563	LOG(AliL3Log::kError,"AliL3HoughTransformerVhdl::TransformCircle","Data")
	564	<<"No input data "<<ENDLOG;
	565	return;
	566	}
	567
	568	//Loop over the padrows:
	569	for(Int_t i=AliL3Transform::GetFirstRow(GetPatch()); i<=AliL3Transform::GetLastRow(GetPatch()); i++)
	570	{
	571	//Get the data on this padrow:
	572	AliL3DigitData *digPt = tempPt->fDigitData;
	573	if(i != (Int_t)tempPt->fRow)
	574	{
6173606e	575	LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Padrows")
6173606e	576	<<"Mismatching padrow numbering."<<ENDLOG;
b46b53c1	577	continue;
	578	}
	579
6173606e	580
b46b53c1	581	//Loop over the data on this padrow:
	582	for(UInt_t j=0; j<tempPt->fNDigit; j++)
	583	{
	584	UShort_t charge = digPt[j].fCharge;
6173606e	585	if((Int_t)charge <= GetLowerThreshold()) continue;
6173606e	586
b46b53c1	587	UChar_t pad = digPt[j].fPad;
b46b53c1	588	UShort_t time = digPt[j].fTime;
6173606e	589
b46b53c1	590	Int_t sector,row;
b46b53c1	591	Float_t xyz[3];
6173606e	592	AliL3FFloat fxyz[3];
6173606e	593
b46b53c1	594	//Transform data to local cartesian coordinates:
	595	AliL3Transform::Slice2Sector(GetSlice(),i,sector,row);
	596	AliL3Transform::Raw2Local(xyz,sector,row,(Int_t)pad,(Int_t)time);
6173606e	597
	598	//trunc to fixed format.
	599	for(int i=0;i<3;i++) {
	600	fxyz[i]=xyz[i];
	601	//cout << fxyz[i];
	602	xyz[i]=fxyz[i];
	603	}
	604	//cout << endl;
	605
b46b53c1	606	//Calculate the eta:
6173606e	607	AliL3FFloat eta = AliL3Transform::GetEta(xyz);
b46b53c1	608
	609	//Get the corresponding index, which determines which histogram to fill:
	610	Int_t eta_index = GetEtaIndex(eta);
6173606e	611	if(eta_index < 0 \|\| eta_index >= GetNEtaSegments()){
6173606e	612	//LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"No histograms corresponding to eta index value of "<<eta_index<<"."<<ENDLOG;
b46b53c1	613	continue;
6173606e	614	}
b46b53c1	615	//Get the correct histogrampointer:
	616	AliL3Histogram *hist = fParamSpace[eta_index];
	617	if(!hist)
	618	{
6173606e	619	//LOG(AliL3Log::kWarning,"AliL3HoughTransformerVhdl::TransformCircle","Histograms")<<"Error getting histogram in index "<<eta_index<<"."<<ENDLOG;
b46b53c1	620	continue;
	621	}
	622
	623	//Do the transformation:
6173606e	624	AliL3FFloat R = sqrt(fxyz[0]fxyz[0] + fxyz[1]fxyz[1]);
6173606e	625	AliL3FFloat phi = AliL3Transform::GetPhi(xyz);
b46b53c1	626
	627	//Fill the histogram along the phirange
	628	for(Int_t b=hist->GetFirstYbin(); b<=hist->GetLastYbin(); b++)
	629	{
6173606e	630	AliL3FFloat phi0 = hist->GetBinCenterY(b);
	631	AliL3FFloat kappa = 2*sin(phi - phi0)/R;
	632	//hist->Fill(kappa.GetExactVal(),phi0.GetExactVal(),charge);
b46b53c1	633	hist->Fill(kappa,phi0,charge);
	634	}
	635	}
	636
	637	//Move the data pointer to the next padrow:
	638	AliL3MemHandler::UpdateRowPointer(tempPt);
	639	}
	640	}
	641
6173606e	642	#endif