GH1D.cxx

Go to the documentation of this file.

#include "GH1D.h"
 
#include <iostream>
#include <fstream>
#include <cstring>
 
#include "TVirtualPad.h"
#include "TString.h"
#include "TF1.h"
#include "TFrame.h"
//#include "TROOT.h"
//#include "TSystem.h"
#include "KeySymbols.h"
#include "TVirtualX.h"
 
#include "Globals.h"
#include "GRootCommands.h"
#include "GCanvas.h"
#include "GH2I.h"
#include "GH2D.h"
 
EVerbosity GH1D::fVerboseLevel = EVerbosity::kQuiet;
 
GH1D::GH1D(const TH1& source) : fParent(nullptr), fProjectionAxis(-1)
{
   source.Copy(*this);
}
 
GH1D::GH1D(const TH1* source) : fParent(nullptr), fProjectionAxis(-1)
{
   source->Copy(*this);
}
 
GH1D::GH1D(const TF1& function, Int_t nbinsx, Double_t xlow, Double_t xup)
   : TH1D(Form("%s_hist", function.GetName()), Form("%s_hist", function.GetName()), nbinsx, xlow, xup), fParent(nullptr),
     fProjectionAxis(-1)
{
   for(int i = 0; i < nbinsx; i++) {
      Fill(GetBinCenter(i), function.Eval(i));
   }
}
 
bool GH1D::WriteDatFile(const char* outFile)
{
   if(strlen(outFile) < 1) {
      return false;
   }
 
   std::ofstream out;
   out.open(outFile);
 
   if(!(out.is_open())) {
      return false;
   }
 
   for(int i = 0; i < GetNbinsX(); i++) {
      out << GetXaxis()->GetBinCenter(i) << "\t" << GetBinContent(i) << std::endl;
   }
   out << std::endl;
   out.close();
 
   return true;
}
 
/*
GH1D::GH1D(const TH1 *source)
  : fParent(nullptr), fProjectionAxis(-1) {
  if(source->GetDiminsion()>1) {
    return;
  }
 
  // Can copy from any 1-d TH1, not just a TH1D
  source->Copy(*this);
 
  // Force a refresh of any parameters stored in the option string.
  SetOption(GetOption());
}
 
void GH1D::SetOption(Option_t* opt) {
  fOption = opt;
 
  TString sopt = opt;
  if(sopt.Index("axis:")) {
    fProjectionAxis = 0;// TODO
  }
}
*/
 
void GH1D::Clear(Option_t* opt)
{
   TH1D::Clear(opt);
   fParent = nullptr;
}
 
void GH1D::Print(Option_t* opt) const
{
   TH1D::Print(opt);
   std::cout << "\tParent: " << fParent.GetObject() << std::endl;
}
 
void GH1D::Copy(TObject& obj) const
{
   TH1D::Copy(obj);
 
   static_cast<GH1D&>(obj).fParent = fParent;
}
 
void GH1D::Draw(Option_t* opt)
{
   TString option(opt);
   if(option.Contains("new", TString::kIgnoreCase)) {
      option.ReplaceAll("new", "");
      new GCanvas;
   }
   TH1D::Draw(option.Data());
   DrawRegions(opt);
   if(gPad != nullptr) {
      gPad->Update();
      gPad->GetFrame()->SetBit(TBox::kCannotMove);
      SetPad(gPad);
   }
}
 
TH1* GH1D::DrawCopy(Option_t* opt, const char* name_postfix) const
{
   TH1* hist = TH1D::DrawCopy(opt, name_postfix);
   if(gPad != nullptr) {
      gPad->Update();
      gPad->GetFrame()->SetBit(TBox::kCannotMove);
   }
   return hist;
}
 
TH1* GH1D::DrawNormalized(Option_t* opt, Double_t norm) const
{
   TH1* hist = TH1D::DrawNormalized(opt, norm);
   if(gPad != nullptr) {
      gPad->Update();
      gPad->GetFrame()->SetBit(TBox::kCannotMove);
   }
   return hist;
}
 
GH1D* GH1D::GetPrevious(bool DrawEmpty) const
{
   if((fParent.GetObject() != nullptr) && fParent.GetObject()->InheritsFrom(GH2Base::Class())) {
      GH2D* gpar  = static_cast<GH2D*>(fParent.GetObject());
      int   first = GetXaxis()->GetFirst();
      int   last  = GetXaxis()->GetLast();
      GH1D* prev  = gpar->GetPrevious(this, DrawEmpty);
      prev->GetXaxis()->SetRange(first, last);
      return prev;   // gpar->GetPrevious(this,DrawEmpty);
   }
   return nullptr;
}
 
GH1D* GH1D::GetNext(bool DrawEmpty) const
{
   if((fParent.GetObject() != nullptr) && fParent.GetObject()->InheritsFrom(GH2Base::Class())) {
      GH2D* gpar  = static_cast<GH2D*>(fParent.GetObject());
      int   first = GetXaxis()->GetFirst();
      int   last  = GetXaxis()->GetLast();
      GH1D* next  = gpar->GetNext(this, DrawEmpty);
      next->GetXaxis()->SetRange(first, last);
      return next;   // gpar->GetNext(this,DrawEmpty);
   }
   return nullptr;
}
 
GH1D* GH1D::Project(double value_low, double value_high) const
{
 
   if((fParent.GetObject() != nullptr) && fParent.GetObject()->InheritsFrom(GH2Base::Class()) && fProjectionAxis != -1) {
      if(value_low > value_high) {
         std::swap(value_low, value_high);
      }
      GH2D* gpar = static_cast<GH2D*>(fParent.GetObject());
      if(fProjectionAxis == 0) {
         int bin_low  = gpar->GetXaxis()->FindBin(value_low);
         int bin_high = gpar->GetXaxis()->FindBin(value_high);
         return gpar->ProjectionY("_py", bin_low, bin_high);
      }
      int bin_low  = gpar->GetYaxis()->FindBin(value_low);
      int bin_high = gpar->GetYaxis()->FindBin(value_high);
      return gpar->ProjectionX("_px", bin_low, bin_high);
   }
   return nullptr;
}
 
GH1D* GH1D::Project_Background(double value_low, double value_high, double bg_value_low, double bg_value_high,
                               EBackgroundSubtraction mode) const
{
   if((fParent.GetObject() != nullptr) && fParent.GetObject()->InheritsFrom(GH2Base::Class()) && fProjectionAxis != -1) {
      if(value_low > value_high) {
         std::swap(value_low, value_high);
      }
      if(bg_value_low > bg_value_high) {
         std::swap(bg_value_low, bg_value_high);
      }
 
      GH2D* gpar = static_cast<GH2D*>(fParent.GetObject());
      if(fProjectionAxis == 0) {
         int bin_low     = gpar->GetXaxis()->FindBin(value_low);
         int bin_high    = gpar->GetXaxis()->FindBin(value_high);
         int bg_bin_low  = gpar->GetXaxis()->FindBin(bg_value_low);
         int bg_bin_high = gpar->GetXaxis()->FindBin(bg_value_high);
 
         return gpar->ProjectionY_Background(bin_low, bin_high, bg_bin_low, bg_bin_high, mode);
      }
      int bin_low     = gpar->GetYaxis()->FindBin(value_low);
      int bin_high    = gpar->GetYaxis()->FindBin(value_high);
      int bg_bin_low  = gpar->GetYaxis()->FindBin(bg_value_low);
      int bg_bin_high = gpar->GetYaxis()->FindBin(bg_value_high);
 
      return gpar->ProjectionX_Background(bin_low, bin_high, bg_bin_low, bg_bin_high, mode);
   }
   return nullptr;
}
 
GH1D* GH1D::Project(int bins)
{
   GH1D*  proj = nullptr;
   double ymax = GetMinimum();
   double ymin = GetMaximum();
   if(bins == -1) {
      bins = static_cast<int>(std::abs(ymax - ymin));
      if(bins < 1) {
         bins = 100;
      }
   }
   proj = new GH1D(Form("%s_y_axis_projection", GetName()), Form("%s_y_axis_projection", GetName()), bins, ymin, ymax);
   for(int i = 0; i < GetNbinsX(); i++) {
      if(GetBinContent(i) != 0) {
         proj->Fill(GetBinContent(i));
      }
   }
 
   return proj;
}
 
void GH1D::SetPad(TVirtualPad* pad)
{
   fPad = pad;
   fPad->GetCanvas()->Connect("ProcessedEvent(Int_t, Int_t, Int_t, TObject*)", "GH1D", this, "HandleMovement(Int_t,Int_t,Int_t, TObject*)");
   gClient->Connect("ProcessedEvent(Event_t*, Window_t)", "GH1D", this, "HandleEvent(Event_t*, Window_t)");
}
 
void GH1D::HandleMovement(Int_t eventType, Int_t eventX, Int_t eventY, TObject* selected)
{
   double currentX = fPad->PixeltoX(eventX);
   double currentY = fPad->PixeltoY(eventY - fPad->GetWh());
 
   if(selected != nullptr && selected->InheritsFrom(TRegion::Class())) {
      auto* region = static_cast<TRegion*>(selected);
      if(eventType == kKeyPress && eventX == kKey_d) {
         RemoveRegion(region);
      } else if(eventType == kButton1Down) {
         fStartX = currentX;
         fStartY = currentY;
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            std::cout << "button 1 down at " << currentX << ", " << currentY << std::endl;
         }
      } else if(eventType == kButton1Motion) {
         if(VerboseLevel() > EVerbosity::kSubroutines) {
            std::cout << "button 1 motion at " << currentX << ", " << currentY << std::endl;
         }
      } else if(eventType == kButton1Up) {
         region->Update(fStartX, currentX);
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            std::cout << "button 1 up at " << currentX << ", " << currentY << std::endl;
         }
      }
   } else if(VerboseLevel() > EVerbosity::kLoops) {
      std::cout << "nullptr selected at " << currentX << ", " << currentY << std::endl;
   }
}
 
void GH1D::HandleEvent(Event_t* event, Window_t window)
{
   //auto* tgWindow = gClient->GetWindowById(window);
 
   if(gPad != fPad && VerboseLevel() < EVerbosity::kAll) {
      return;
   }
 
   if((VerboseLevel() > EVerbosity::kBasicFlow && event->fType != kMotionNotify && event->fType != kLeaveNotify) ||
      (VerboseLevel() > EVerbosity::kSubroutines && event->fState != 0) ||
      (VerboseLevel() > EVerbosity::kLoops)) {
      std::cout << __PRETTY_FUNCTION__ << ", event " << event << ", window " << window << ", type " << event->fType << ", code " << event->fCode << ", state " << event->fState << ", x " << event->fX << ", root-x " << event->fXRoot << ", y " << event->fY << ", root-y " << event->fYRoot << ", x/y coordinates: x " << fPad->PixeltoX(event->fX) << ", y " << fPad->PixeltoY(event->fY - fPad->GetWh()) << ", root-x " << fPad->PixeltoX(event->fXRoot) << ", root-y " << fPad->PixeltoY(event->fYRoot - fPad->GetWh()) << "; fPad " << fPad << " = \"" << fPad->GetName() << "\", gPad " << gPad << " = \"" << gPad->GetName() << "\"" << std::endl;   // NOLINT(cppcoreguidelines-pro-type-const-cast, cppcoreguidelines-pro-bounds-array-to-pointer-decay)
   }
 
   switch(event->fType) {
   case kGKeyPress:   // if a key is held, this one gets repeated
   {
      UInt_t              keySymbol = 0;
      std::array<char, 2> str;
      gVirtualX->LookupString(event, str.data(), str.size(), keySymbol);
 
      if((VerboseLevel() > EVerbosity::kBasicFlow && event->fType != kMotionNotify && event->fType != kLeaveNotify) ||
         (VerboseLevel() > EVerbosity::kSubroutines && event->fState != 0) ||
         (VerboseLevel() > EVerbosity::kLoops)) {
         std::cout << "key symbol " << keySymbol << " = " << hex(keySymbol) << std::endl;   // NOLINT(cppcoreguidelines-pro-type-const-cast, cppcoreguidelines-pro-bounds-array-to-pointer-decay)
      }
 
      if(str[0] == kESC) {   // ESC sets the escape flag
         gROOT->SetEscape();
         gPad->Modified();
      }
      if(str[0] == 3) {   // ctrl-c sets the interrupt flag
         gROOT->SetInterrupt();
      }
 
      switch(keySymbol) {
      case kKey_b:
         fBackground = true;
         break;
      case kKey_g:
         fGate = true;
         break;
      case kKey_r:
         fRegion = true;
         break;
      case kKey_l:
         // toggle logscale for y
         if(fPad->GetLogy() == 0) {
            fPad->SetLogy(1);
         } else {
            fPad->SetLogy(0);
         }
         // we need to update the pad to get the new frame the histogram is draw in, then update it again after the regions have been re-drawn ...
         UpdatePad();
         DrawRegions();
         UpdatePad();
         break;
      case kKey_p:
         //f2DPlayer->Project();
         break;
      case kKey_u:
         GetXaxis()->UnZoom();
         GetYaxis()->UnZoom();
         // we need to update the pad to get the new frame the histogram is draw in, then update it again after the regions have been re-drawn ...
         UpdatePad();
         DrawRegions();
         UpdatePad();
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            PrintRegions();
         }
         break;
      case kKey_U:
         GetYaxis()->UnZoom();
         // we need to update the pad to get the new frame the histogram is draw in, then update it again after the regions have been updated ...
         UpdatePad();
         DrawRegions();
         UpdatePad();
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            PrintRegions();
         }
         break;
      case kKey_Escape:
         if(fGate || fBackground || fRegion) {
            RemoveCurrentRegion();
         }
         if(VerboseLevel() > EVerbosity::kQuiet) {
            std::cout << "Escape!" << std::endl;
         }
         break;
      case kKey_Left:
      case kKey_Up:
      case kKey_Right:
      case kKey_Down:
         // handle arrow keys
         if(VerboseLevel() > EVerbosity::kQuiet) {
            std::cout << "Moving histogram" << std::endl;
         }
         Move1DHistogram(keySymbol, this);
         // we need to update the pad to get the new frame the histogram is draw in, then update it again after the regions have been updated ...
         UpdatePad();
         DrawRegions();
         UpdatePad();
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            PrintRegions();
         }
         break;
      }
   } break;
   case kKeyRelease:
      break;
   case kButtonPress:
      switch(event->fCode) {
      case 1:
         if(event->fState == 0 && (fGate || fBackground || fRegion)) {
            fStartX        = fPad->PixeltoX(event->fX);
            fStartY        = fPad->PixeltoY(event->fY - fPad->GetWh());
            fCurrentRegion = new TBox(fStartX, fStartY, fStartX, fStartY);
            if(fGate) {
               fCurrentRegion->SetFillColorAlpha(kRed, 0.2);
            } else if(fBackground) {
               fCurrentRegion->SetFillColorAlpha(kBlue, 0.2);
            } else if(fRegion) {
               fCurrentRegion->SetFillColorAlpha(fRegionColor[fNofRegions % fRegionColor.size()], 0.2);
            }
            fCurrentRegion->Draw();
            if(VerboseLevel() > EVerbosity::kBasicFlow) {
               PrintRegions();
            }
         }
         break;
      case 4:
      case 5:
         // code 4 & 5 are wheel down & up, respectively
         // state 0 - no key, 1 - shift, 4 - control, 8 - option, 16 - command
         if(event->fState == 0) {
            // we want to increase/reduce our range by 10% w/o changing the minimum
            // for wheel down/up, respectively
            double factor = 0.90;
            if(event->fCode == 4) {
               factor = 1.10;
            }
            if(VerboseLevel() > EVerbosity::kQuiet) {
               std::cout << "factor " << factor << ": maximum " << GetMinimum() + (GetMaximum() - GetMinimum()) * factor << ", old range " << (GetMaximum() - GetMinimum()) << " = " << GetMaximum() << " - " << GetMinimum() << std::endl;
            }
            SetMaximum(GetMinimum() + (GetMaximum() - GetMinimum()) * factor);
            if(VerboseLevel() > EVerbosity::kQuiet) {
               std::cout << "new range: " << (GetMaximum() - GetMinimum()) << " = " << GetMaximum() << " - " << GetMinimum() << std::endl;
            }
         } else if(event->fState == 1) {
            if(event->fCode == 4) {
               Move1DHistogram(kKey_Left, this);
            } else {
               Move1DHistogram(kKey_Right, this);
            }
         }
         // we need to update the pad to get the new frame the histogram is draw in, then update it again after the regions have been updated ...
         UpdatePad();
         DrawRegions();
         UpdatePad();
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            PrintRegions();
         }
         break;
      default:
         break;
      }
      break;
   case kMotionNotify:
      if(event->fState == 256 && (fGate || fBackground || fRegion)) {
         double currentX = fPad->PixeltoX(event->fX);
         double currentY = fPad->PixeltoY(event->fY - fPad->GetWh());
         if(VerboseLevel() > EVerbosity::kQuiet) {
            std::cout << "current box: " << fStartX << " - " << fStartY << ", " << currentX << " - " << currentY << ", canvas: " << fPad->PixeltoX(fPad->GetCanvas()->GetEventX()) << " - " << fPad->PixeltoY(fPad->GetCanvas()->GetEventY()) << std::endl;
         }
         fCurrentRegion->SetX2(currentX);
         fCurrentRegion->SetY2(currentY);
         fCurrentRegion->Draw();
         UpdatePad();
         if(VerboseLevel() > EVerbosity::kBasicFlow) {
            PrintRegions();
         }
      }
      break;
   case kButtonRelease:
      if(event->fCode == 1) {
         if(event->fState == 0) {
            if(!fGate && !fBackground && !fRegion) {
               // check whether we are in the frame or not
               double currentX = fPad->PixeltoX(event->fX);
               double currentY = fPad->PixeltoY(event->fY - fPad->GetWh());
               if(VerboseLevel() > EVerbosity::kBasicFlow) { std::cout << "current x " << currentX << ", current y " << currentY << std::endl; }
               if(Pad()->GetFrame()->GetX1() < currentX && currentX < Pad()->GetFrame()->GetX2() &&
                  Pad()->GetFrame()->GetY1() < currentY && currentY < Pad()->GetFrame()->GetY2()) {
                  if(VerboseLevel() > EVerbosity::kQuiet) {
                     std::cout << "inside frame" << std::endl;
                  }
               } else {
                  // not a new gate, background, or region, and we're outside the frame => we just zoomed in on the x-axis
                  GetYaxis()->UnZoom();
                  if(VerboseLevel() > EVerbosity::kQuiet) {
                     std::cout << "outside frame" << std::endl;
                  }
               }
               // we need to update the pad to get the new frame the histogram is draw in, then update it again after the regions have been updated ...
               UpdatePad();
               DrawRegions();
               UpdatePad();
               if(VerboseLevel() > EVerbosity::kBasicFlow) {
                  PrintRegions();
               }
            } else {
               double stopX = fPad->PixeltoX(event->fX);
               double stopY = fPad->PixeltoY(event->fY - fPad->GetWh());
               fCurrentRegion->SetX2(stopX);
               fCurrentRegion->SetY2(stopY);
               if(fGate) {
                  if(VerboseLevel() > EVerbosity::kQuiet) {
                     std::cout << "new gate: " << fStartX << " - " << stopX << std::endl;
                  }
                  fRegions.Add(new TRegion(fCurrentRegion, ERegionType::kGate, this));
                  fGate = false;
               } else if(fBackground) {
                  if(VerboseLevel() > EVerbosity::kQuiet) {
                     std::cout << "new background: " << fStartX << " - " << stopX << std::endl;
                  }
                  fRegions.Add(new TRegion(fCurrentRegion, ERegionType::kBackground, this));
                  fBackground = false;
               } else if(fRegion) {
                  if(VerboseLevel() > EVerbosity::kQuiet) {
                     std::cout << "new region: " << fStartX << " - " << stopX << std::endl;
                  }
                  fRegions.Add(new TRegion(fCurrentRegion, ERegionType::kRegion, this));
                  fRegion = false;
                  ++fNofRegions;
               }
               RemoveCurrentRegion();
               static_cast<TRegion*>(fRegions.Last())->Draw();
               if(VerboseLevel() > EVerbosity::kBasicFlow) {
                  PrintRegions();
               }
            }
         }
      }
      break;
   default:
      break;
   }
}
 
void GH1D::UpdateRegions()
{
   for(auto* obj : fRegions) {
      static_cast<TRegion*>(obj)->Update();
   }
}
 
void GH1D::DrawRegions(Option_t* opt)
{
   for(auto* obj : fRegions) {
      static_cast<TRegion*>(obj)->Draw(opt);
   }
}
 
void GH1D::PrintRegions()
{
   std::cout << GetName() << "/" << GetTitle() << " - Regions:" << std::endl;
   int index = 0;
   for(auto* obj : *(Pad()->GetListOfPrimitives())) {
      if(obj->InheritsFrom(TRegion::Class())) {
         std::cout << index << ": " << obj << " ";
         obj->Print();
         ++index;
      }
   }
}
 
void GH1D::RemoveCurrentRegion()
{
   fGate       = false;
   fBackground = false;
   fRegion     = false;
   fPad->GetListOfPrimitives()->Remove(fCurrentRegion);
   delete fCurrentRegion;
   fCurrentRegion = nullptr;
}
 
void GH1D::RemoveRegion(TRegion* region)
{
   fPad->GetListOfPrimitives()->Remove(region);
   fRegions.Remove(region);
}
 
TRegion::TRegion(TBox* box, ERegionType type, GH1D* parent)
   : TBox(*box), fParent(parent), fType(type), fLowX(box->GetX1()), fHighX(box->GetX2())
{
   // make sure that x1 is smaller than x2
   if(GetX1() > GetX2()) {
      double tmpX = GetX1();
      SetX1(GetX2());
      SetX2(tmpX);
      std::swap(fLowX, fHighX);
   }
   // align the edges of the region with the bins of the histogram
   auto* axis = parent->GetXaxis();
   fLowX      = axis->GetBinLowEdge(axis->FindBin(fLowX));
   fHighX     = axis->GetBinUpEdge(axis->FindBin(fHighX));
}
 
bool TRegion::Update()
{
   /// Updates y-range of this region to match the current y-range of the frame the parent is drawn in.
   /// Also checks the x-range and adjust it to only cover the displayed range if necessary.
   /// Returns whether the region should be drawn or not.
   /// Does not update the pad itself!
 
   bool result = true;
 
   auto* frame = fParent->Pad()->GetFrame();
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << "Frame: " << frame->GetX1() << " - " << frame->GetX2() << ", " << frame->GetY1() << " - " << frame->GetY2() << " -> updating y-range from " << GetY1() << " - " << GetY2();
   }
   if(fParent->Pad()->GetLogy() == 0) {
      // linear scale: set y-range directly from frame
      SetY1(frame->GetY1());
      SetY2(frame->GetY2());
   } else {
      // logarithmic scale: frame reports the exponent as y1 and y2
      SetY1(TMath::Power(10., frame->GetY1()));
      SetY2(TMath::Power(10., frame->GetY2()));
   }
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << " to " << GetY1() << " - " << GetY2() << std::endl;
   }
 
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << "Updating x-range from " << GetX1() << " - " << GetX2() << " (" << fLowX << " - " << fHighX << ")";
   }
   if(frame->GetX1() < fLowX && fHighX < frame->GetX2()) {
      // whole region is visible -> use original range
      if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
         std::cout << " (whole region)";
      }
      SetX1(fLowX);
      SetX2(fHighX);
   } else if(frame->GetX2() < fLowX || fHighX < frame->GetX1()) {
      // region is out of frame, do nothing? What if the region is just out of the frame but in the canvas?
      // Using GetUxmin() and GetUxmax() to set range to values outside the pad range and not just the frame range does not work.
      // So we simply hide this region whenever it is outside the frame.
      // This also means we have to actively draw it whenever it is (partly) in frame (in case it was hidden before).
      if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
         std::cout << " (out of " << frame->GetX1() << " - " << frame->GetX2() << ")";
      }
      result = false;
   } else if(fHighX < frame->GetX2()) {
      // low part of region is out of frame -> adjust low x
      if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
         std::cout << " (high part)";
      }
      SetX1(frame->GetX1());
      SetX2(fHighX);
   } else if(frame->GetX1() < fLowX) {
      // high part of region is out of frame -> adjust high x
      if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
         std::cout << " (low part)";
      }
      SetX1(fLowX);
      SetX2(frame->GetX2());
   } else {
      // region is larger than visible range on both side -> adjust both
      if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
         std::cout << " (region too big)";
      }
      SetX1(frame->GetX1());
      SetX2(frame->GetX2());
   }
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << " to " << GetX1() << " - " << GetX2() << std::endl;
   }
 
   return result;
}
 
void TRegion::Draw(Option_t* opt)
{
   /// Draw this region. Calls Update() first to update ranges and to check if we actuall want to draw this range.
   /// If Update() returns false this function will actually hide this region!
   /// Updates the pad at the end.
   if(fParent == nullptr) {
      throw std::runtime_error("Can't draw region without parent histogram!");
   }
 
   if(Update()) {
      if(fParent->Pad()->GetListOfPrimitives()->FindObject(this) == nullptr) {
         TBox::Draw(opt);
      } else if(GH1D::VerboseLevel() > EVerbosity::kQuiet) {
         std::cout << this << " region " << fLowX << " - " << fHighX << " already has been drawn" << std::endl;
      }
   } else {
      Hide();
   }
   fParent->UpdatePad();
}
 
void TRegion::Hide()
{
   /// Hide this region. Removes region from list of primitives. Does not update the pad.
   if(fParent == nullptr) {
      throw std::runtime_error("Can't draw region without parent histogram!");
   }
 
   fParent->Pad()->GetListOfPrimitives()->Remove(this);
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << "hid region " << fLowX << " - " << fHighX << std::endl;
      fParent->PrintRegions();
   }
}
 
void TRegion::Update(double startX, double stopX)
{
   /// Depending on the starting position this function updates the left or right edge of the region to the stopping position.
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << "region " << fLowX << " - " << fHighX << ", start x " << startX << ", stop x " << stopX;
   }
   if(std::abs(startX - fLowX) < std::abs(startX - fHighX)) {
      fLowX = stopX;
   } else {
      fHighX = stopX;
   }
   if(GH1D::VerboseLevel() > EVerbosity::kBasicFlow) {
      std::cout << " => " << fLowX << " - " << fHighX << std::endl;
   }
   Update();
}