/data/refman/pasoursint/CMSSW_6_1_2_SLHC2_patch1/src/SimTracker/TrackerMaterialAnalysis/plugins/TrackingMaterialPlotter.cc

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#include <iostream>

#include <TROOT.h>
#include <TObjArray.h>
#include <TColor.h>
#include <TStyle.h>
#include <TCanvas.h>
#include <TFrame.h>
#include "XHistogram.h"
#include "TrackingMaterialPlotter.h"

#include "SimDataFormats/ValidationFormats/interface/MaterialAccountingStep.h"

void TrackingMaterialPlotter::fill_color(void)
{
  m_color.push_back(kBlack);          // unassigned
  m_color.push_back(kBlue);           // PixelBarrel
  m_color.push_back(kBlue  + 100);    //
  m_color.push_back(kBlue);           //
  m_color.push_back(kGreen);          // TIB
  m_color.push_back(kGreen + 100);    //
  m_color.push_back(kGreen);          //
  m_color.push_back(kGreen + 100);    //
  m_color.push_back(kRed);            // TOB
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kBlue);           // PixelEndcap Z-
  m_color.push_back(kBlue  + 100);    //
  m_color.push_back(kGreen);          // TID Z-
  m_color.push_back(kGreen + 100);    //
  m_color.push_back(kGreen);          //
  m_color.push_back(kRed);            // TEC Z-
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kBlue);           // PixelEndcap Z+
  m_color.push_back(kBlue  + 100);    //
  m_color.push_back(kGreen);          // TID Z+
  m_color.push_back(kGreen + 100);    //
  m_color.push_back(kGreen);          //
  m_color.push_back(kRed);            // TEC Z+
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
  m_color.push_back(kRed   + 100);    //
  m_color.push_back(kRed);            //
}


unsigned int TrackingMaterialPlotter::fill_gradient(const TColor & first, const TColor & last, unsigned int steps /*= 100*/, unsigned int index /* = 0*/)
{
  if (index == 0) {
    // if no index was given, find the highest used one and start from that plus one
    index = ((TObjArray*) gROOT->GetListOfColors())->GetLast() + 1;
  }

  float r1, g1, b1, r2, g2, b2;
  first.GetRGB(r1, g1, b1);
  last.GetRGB(r2, g2, b2);
  float delta_r = (r2 - r1) / (steps - 1);
  float delta_g = (g2 - g1) / (steps - 1);
  float delta_b = (b2 - b1) / (steps - 1);

  m_gradient.resize(steps);
  for (unsigned int i = 0; i < steps; ++i) {
    new TColor(index + i, r1 + delta_r * i, g1 + delta_g * i, b1 + delta_b * i);
    m_gradient[i] = index + i;
  }

  return index;
}

unsigned int TrackingMaterialPlotter::fill_gradient(unsigned int first, unsigned int last, unsigned int steps /*= 100*/, unsigned int index /* = 0*/)
{
  return fill_gradient(* (TColor *) gROOT->GetListOfColors()->At(first), * (TColor *) gROOT->GetListOfColors()->At(last), steps, index);
}

TrackingMaterialPlotter::TrackingMaterialPlotter( float maxZ, float maxR, float resolution )
{
  const float rzMinZ  = -maxZ;
  const float rzMaxZ  =  maxZ;
  const float rzMinR  =    0.;
  const float rzMaxR  =  maxR;
  const int   rzBinsZ = (int) (2. * maxZ * resolution);
  const int   rzBinsR = (int) (     maxR * resolution);

  std::vector<double> max;
  max.push_back( 0.02 );
  max.push_back( 0.04 );
  m_tracker = XHistogram( 2, rzBinsZ, rzBinsR, std::make_pair(rzMinZ, rzMaxZ), std::make_pair(rzMinR, rzMaxR), m_color.size(), max);

  TColor::InitializeColors();
  fill_color();
  fill_gradient( kWhite, kBlack, 100);              // 100-steps gradient from white to black
}

void TrackingMaterialPlotter::plotSegmentUnassigned( const MaterialAccountingStep & step )
{
  std::vector<double> w(2);
  w[0] = step.radiationLengths();
  w[1] = step.energyLoss();
  m_tracker.fill( std::make_pair(step.in().z(), step.out().z()),
                  std::make_pair(step.in().perp(), step.out().perp()),
                  w, step.length(), 1 );             // 0 is empty, 1 is unassigned
}

void TrackingMaterialPlotter::plotSegmentInLayer( const MaterialAccountingStep & step, int layer )
{
  std::vector<double> w(2);
  w[0] = step.radiationLengths();
  w[1] = step.energyLoss();
  m_tracker.fill( std::make_pair(step.in().z(), step.out().z()),
                  std::make_pair(step.in().perp(), step.out().perp()),
                  w, step.length(), layer+1 );       // layer is 1-based, but plot uses: 0 is empty, 1 is unassigned
}


void TrackingMaterialPlotter::draw( void )
{
  const double scale = 10.;
  TCanvas* canvas;

  XHistogram::Histogram* radlen = m_tracker.get(0);
  canvas = new TCanvas("radlen_rz", "RadiationLengths - RZ view", (int) (600 * scale * 1.25),  (int) (120 * scale * 1.50));
  gStyle->SetOptStat(0);
  gStyle->SetPalette( m_gradient.size(), & m_gradient.front() );
  gStyle->SetNumberContours( m_gradient.size() );
  canvas->GetFrame()->SetFillColor(kWhite);
  radlen->Draw("colz");
  radlen->Draw("same axis y+");
  canvas->SaveAs("radlen.png");
  delete canvas;

  XHistogram::Histogram* dedx = m_tracker.get(1);
  canvas = new TCanvas("dedx_rz", "-dE/dx term - RZ view", (int) (600 * scale * 1.25),  (int) (120 * scale * 1.50));
  canvas->GetFrame()->SetFillColor(kWhite);
  gStyle->SetOptStat(0);
  gStyle->SetPalette( m_gradient.size(), & m_gradient.front() );
  gStyle->SetNumberContours( m_gradient.size() );
  dedx->Draw("colz");
  dedx->Draw("same axis y+");
  canvas->SaveAs("dedx.png");
  delete canvas;

  XHistogram::ColorMap* colormap = m_tracker.colormap();
  canvas = new TCanvas("layer_rz", "Layers - RZ view", (int) (600 * scale * 1.25),  (int) (120 * scale * 1.50));
  canvas->GetFrame()->SetFillColor(kWhite);
  gStyle->SetOptStat(0);
  gStyle->SetPalette( m_color.size(), & m_color.front() );
  gStyle->SetNumberContours( m_color.size() );
  colormap->SetMinimum( 1 );
  colormap->SetMaximum( m_color.size() );
  colormap->Draw("col");
  colormap->Draw("same axis y+");
  canvas->SaveAs("layers.png");
  delete canvas;
}