CbmRichRingFitterQa.cxx

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/* Copyright (C) 2009-2016 UGiessen/JINR-LIT, Giessen/Dubna
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Semen Lebedev [committer] */
 
#include "CbmRichRingFitterQa.h"
 
#include "CbmRichRing.h"
#include "CbmRichRingFitterCOP.h"
#include "CbmRichRingFitterEllipseMinuit.h"
#include "CbmRichRingFitterEllipseTau.h"
#include "TCanvas.h"
#include "TH1D.h"
#include "TMath.h"
#include "TMatrixD.h"
#include "TRandom.h"
 
#include <iostream>
#include <vector>
 
using std::cout;
using std::endl;
using std::vector;
 
CbmRichRingFitterQa::CbmRichRingFitterQa()
  : fhErrorA(NULL)
  , fhErrorB(NULL)
  , fhErrorX(NULL)
  , fhErrorY(NULL)
  , fhErrorPhi(NULL)
  ,
 
  fhA(NULL)
  , fhB(NULL)
  , fhX(NULL)
  , fhY(NULL)
  , fhPhi(NULL)
  ,
 
  fhRadiusErr(NULL)
  , fhCircleXcErr(NULL)
  , fhCircleYcErr(NULL)
  ,
 
  fhRadius(NULL)
  , fhCircleXc(NULL)
  , fhCircleYc(NULL)
  ,
 
  fhRadiusPool(NULL)
  , fhCircleXcPool(NULL)
  , fhCircleYcPool(NULL)
{
  fhErrorA   = new TH1D("fhErrorA", "fhErrorA;dA [cm];Counter", 100, -2., 2.);
  fhErrorB   = new TH1D("fhErrorB", "fhErrorB;B [cm];Counter", 100, -2., 2.);
  fhErrorX   = new TH1D("fhErrorX", "fhErrorX;X [cm];Counter", 100, -2., 2.);
  fhErrorY   = new TH1D("fhErrorY", "fhErrorY;Y [cm];Counter", 100, -2., 2.);
  fhErrorPhi = new TH1D("fhErrorPhi", "fhErrorPhi;d#Phi [rad];Counter", 100, -2., 2.);
 
  fhA         = new TH1D("fhA", "fhA;A [cm];Counter", 100, 5., 7.);
  fhB         = new TH1D("fhB", "fhB;B [cm];Counter", 100, 5., 7.);
  fhX         = new TH1D("fhX", "fhX;X [cm];Counter", 100, -1., 1.);
  fhY         = new TH1D("fhY", "fhY;Y [cm];Counter", 100, -1., 1.);
  Double_t pi = TMath::Pi();
  fhPhi       = new TH1D("fhPhi", "fhPhi;#Phi [rad];Counter", 100, -pi / 2. - pi / 6., pi / 2. + pi / 6.);
 
  // circle fitting
  fhRadiusErr    = new TH1D("fhRadiusErr", "fhRadiusErr;dR [cm];Counter", 100, -2., 2.);
  fhCircleXcErr  = new TH1D("fhCircleXcErr", "fhCircleXcErr;dXc [cm];Counter", 100, -2., 2.);
  fhCircleYcErr  = new TH1D("fhCircleYcErr", "fhCircleYcErr;dYc [cm];Counter", 100, -2., 2.);
  fhRadius       = new TH1D("fhRadius", "fhRadius;Radius [cm];Counter", 100, 4., 8.);
  fhCircleXc     = new TH1D("fhCircleXc", "fhCircleXc;Xc [cm];Counter", 100, -2., 2.);
  fhCircleYc     = new TH1D("fhCircleYc", "fhCircleYc;Yc [cm];Counter", 100, -2., 2.);
  fhRadiusPool   = new TH1D("fhRadiusPool", "fhRadiusPool;Pool R;Counter", 100, -5., 5.);
  fhCircleXcPool = new TH1D("fhCircleXcPool", "fhCircleXcPool;Pool Xc;Counter", 100, -5., 5.);
  fhCircleYcPool = new TH1D("fhCircleYcPool", "fhCircleYcPool;Pool Yc;Counter", 100, -5., 5.);
}
 
CbmRichRingFitterQa::~CbmRichRingFitterQa() {}
 
void CbmRichRingFitterQa::GenerateEllipse()
{
  //    Double_t maxX = 15;
  //    Double_t maxY = 15;
  Int_t nofHits       = 50;
  Double_t A          = 6.;
  Double_t B          = 6.;
  Double_t sigmaError = 0.2;
  CbmRichRingLight ellipse;
  Int_t nofBadFit = 0;
  Double_t X0     = 0.;  //gRandom->Rndm()*(maxX - A);
  Double_t Y0     = 0.;  //gRandom->Rndm()* (maxY - A);
 
  CbmRichRingFitterEllipseTau* fitEllipse = new CbmRichRingFitterEllipseTau();
  CbmRichRingFitterCOP* fitCircle         = new CbmRichRingFitterCOP();
 
  for (Int_t iR = 0; iR < 50000; iR++) {
    Double_t phi = 0.;  //TMath::Pi()*(6./12.); //gRandom->Rndm()*TMath::Pi() - TMath::Pi()/2.;
    ellipse.SetXYABP(X0, Y0, A, B, phi);
    for (Int_t iH = 0; iH < nofHits; iH++) {
      Double_t alfa = gRandom->Rndm() * 2. * TMath::Pi();
 
      Double_t errorX = gRandom->Gaus(0, sigmaError);
      Double_t errorY = gRandom->Gaus(0, sigmaError);
 
      Double_t hx = A * cos(alfa);
      Double_t hy = B * sin(alfa);
 
      Double_t hitXRot = hx * cos(phi) - hy * sin(phi);
      Double_t hitYRot = hx * sin(phi) + hy * cos(phi);
 
      CbmRichHitLight hit(hitXRot + X0 + errorX, hitYRot + Y0 + errorY);
      ellipse.AddHit(hit);
    }
    // ellipse fit
    fitEllipse->DoFit(&ellipse);
    fhErrorA->Fill(A - ellipse.GetAaxis());
    fhErrorB->Fill(B - ellipse.GetBaxis());
    fhErrorX->Fill(X0 - ellipse.GetCenterX());
    fhErrorY->Fill(Y0 - ellipse.GetCenterY());
    fhErrorPhi->Fill(phi - ellipse.GetPhi());
    fhA->Fill(ellipse.GetAaxis());
    fhB->Fill(ellipse.GetBaxis());
    fhX->Fill(ellipse.GetCenterX());
    fhY->Fill(ellipse.GetCenterY());
    fhPhi->Fill(ellipse.GetPhi());
 
    // circle fit
    fitCircle->DoFit(&ellipse);
    TMatrixD cov(3, 3);
    CalculateFitErrors(&ellipse, sigmaError, cov);
    Double_t mcR = (A + B) / 2.;
    fhRadiusErr->Fill(mcR - ellipse.GetRadius());
    fhCircleXcErr->Fill(X0 - ellipse.GetCenterX());
    fhCircleYcErr->Fill(Y0 - ellipse.GetCenterY());
    fhRadius->Fill(ellipse.GetRadius());
    fhCircleXc->Fill(ellipse.GetCenterX());
    fhCircleYc->Fill(ellipse.GetCenterY());
    fhRadiusPool->Fill((mcR - ellipse.GetRadius()) / sqrt(cov(2, 2)));
    fhCircleXcPool->Fill((X0 - ellipse.GetCenterX()) / sqrt(cov(0, 0)));
    fhCircleYcPool->Fill((Y0 - ellipse.GetCenterY()) / sqrt(cov(1, 1)));
  }  // iR
 
  Draw();
  cout << nofBadFit << endl;
}
 
void CbmRichRingFitterQa::Draw(Option_t*)
{
  TCanvas* c = new TCanvas("rich_fitter_errors", "rich_fitter_errors", 900, 600);
  c->Divide(3, 2);
  c->cd(1);
  fhErrorA->Draw();
  c->cd(2);
  fhErrorB->Draw();
  c->cd(3);
  fhErrorX->Draw();
  c->cd(4);
  fhErrorY->Draw();
  c->cd(5);
  fhErrorPhi->Draw();
  cout.precision(4);
  cout << fhErrorA->GetMean() << " " << fhErrorA->GetRMS() << endl;
  cout << fhErrorB->GetMean() << " " << fhErrorB->GetRMS() << endl;
  cout << fhErrorX->GetMean() << " " << fhErrorX->GetRMS() << endl;
  cout << fhErrorY->GetMean() << " " << fhErrorY->GetRMS() << endl;
  cout << fhErrorPhi->GetMean() << " " << fhErrorPhi->GetRMS() << endl;
 
  TCanvas* c2 = new TCanvas("rich_fitter_params", "rich_fitter_params", 900, 600);
  c2->Divide(3, 2);
  c2->cd(1);
  fhA->Draw();
  c2->cd(2);
  fhB->Draw();
  c2->cd(3);
  fhX->Draw();
  c2->cd(4);
  fhY->Draw();
  c2->cd(5);
  fhPhi->Draw();
 
  TCanvas* c3 = new TCanvas("rich_fitter_circle", "rich_fitter_circle", 900, 900);
  c3->Divide(3, 3);
  c3->cd(1);
  fhRadiusErr->Draw();
  c3->cd(2);
  fhCircleXcErr->Draw();
  c3->cd(3);
  fhCircleYcErr->Draw();
  c3->cd(4);
  fhRadius->Draw();
  c3->cd(5);
  fhCircleXc->Draw();
  c3->cd(6);
  fhCircleYc->Draw();
  c3->cd(7);
  fhRadiusPool->Draw();
  c3->cd(8);
  fhCircleXcPool->Draw();
  c3->cd(9);
  fhCircleYcPool->Draw();
}
 
void CbmRichRingFitterQa::CalculateFitErrors(CbmRichRingLight* ring, Double_t sigma, TMatrixD& cov)
{
  //TMatrixD H3(3,3);
  TMatrixD HY3(3, 1);
  //TMatrixD Cov3(3,3);
  TMatrixD HC3(3, 1);
 
  for (Int_t i = 0; i < 3; i++) {
    HY3(i, 0) = 0;
    HC3(i, 0) = 0;
    for (Int_t j = 0; j < 3; j++) {
      //H3(i,j) = 0;
      cov(i, j) = 0;
    }
  }
 
  Double_t xc = ring->GetCenterX();
  Double_t yc = ring->GetCenterY();
  Double_t R  = ring->GetRadius();
  for (Int_t iHit = 0; iHit < ring->GetNofHits(); iHit++) {
    Double_t xi  = ring->GetHit(iHit).fX;
    Double_t yi  = ring->GetHit(iHit).fY;
    Double_t ri  = sqrt((xi - xc) * (xi - xc) + (yi - yc) * (yi - yc));
    Double_t err = sigma;
 
    Double_t f1 = (-1.0 * (xi - xc)) / (ri * err);
    Double_t f2 = (-1.0 * (yi - yc)) / (ri * err);
    Double_t f3 = (-1.) / err;
    Double_t Y  = (R - ri) / err;
 
    cov(0, 0) = cov(0, 0) + f1 * f1;
    cov(0, 1) = cov(0, 1) + f1 * f2;
    cov(0, 2) = cov(0, 2) + f1 * f3;
 
    cov(1, 0) = cov(0, 1);
    cov(1, 1) = cov(1, 1) + f2 * f2;
    cov(1, 2) = cov(1, 2) + f2 * f3;
 
    cov(2, 0) = cov(0, 2);
    cov(2, 1) = cov(1, 2);
    cov(2, 2) = cov(2, 2) + f3 * f3;
 
    HY3(0, 0) = HY3(0, 0) + Y * f1;
    HY3(1, 0) = HY3(1, 0) + Y * f2;
    HY3(2, 0) = HY3(2, 0) + Y * f3;
  }  // iHit
 
  //H3.Print();
  Double_t det = 0.0;
  cov.Invert(&det);
  //Cov3 = H3;
  //H3.Print();
  //Cov3.Print();
 
  //HC3 = H3 * HY3;
  //HC3.Print();
 
  //cout << "dX0= " << HC3(0,0) << " +- " << sqrt(Cov3(0,0)) << endl;
  // cout << "dY0= " << HC3(1,0) <<  " +- " << sqrt(Cov3(1,1)) << endl;
  //cout << "dR= " << HC3(2,0) << " +- " << sqrt(Cov3(2,2)) << endl;
 
  //cout << "dX0= " << HC3(0,0) << " +- " << sqrt(Cov3(0,0)) << endl;
  // cout << "dY0= " << HC3(1,0) <<  " +- " << sqrt(Cov3(1,1)) << endl;
  // cout << "dR= " << HC3(2,0) << " +- " << sqrt(Cov3(2,2)) << endl;
}
 
ClassImp(CbmRichRingFitterQa);