draw_rh3_large.cxx File Reference

Detailed Description

This macro generates really large RH2D histogram, fills it with predefined pattern and draw it in a RCanvas, using Optmize() drawing mode.

 
/*************************************************************************
 * Copyright (C) 1995-2020, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include "ROOT/RHistDrawable.hxx"
#include "ROOT/RCanvas.hxx"
#include "ROOT/RFrameTitle.hxx"
#include "ROOT/RHistStatBox.hxx"
#include "ROOT/RFrame.hxx"
#include "TString.h"
 
// macro must be here while cling is not capable to load
// library automatically for outlined function see ROOT-10336
R__LOAD_LIBRARY(libROOTHistDraw)
 
using namespace ROOT::Experimental;
 
void draw_rh3_large()
{
   const int nbins = 200;
 
   // Create the histogram.
   RAxisConfig xaxis("x", nbins, 0., nbins);
   RAxisConfig yaxis("y", nbins, 0., nbins);
   RAxisConfig zaxis("z", nbins, 0., nbins);
   auto pHist = std::make_shared<RH3D>(xaxis, yaxis, zaxis);
 
   for(int i=0;i<nbins;++i)
      for(int j=0;j<nbins;++j)
         for(int k=0;k<nbins;++k)
            pHist->Fill({1.*i,1.*j,1.*k}, i+j+k);
 
   // Create a canvas to be displayed.
   auto canvas = RCanvas::Create("Canvas Title");
 
   auto frame = canvas->GetOrCreateFrame();
 
   // should we made special style for frame with palette?
   // frame->Margins().SetRight(0.2_normal);
 
   frame->AttrX().SetZoom(nbins*0.1, nbins*0.9);
   frame->AttrY().SetZoom(nbins*0.1, nbins*0.9);
   frame->AttrZ().SetZoom(nbins*0.1, nbins*0.9);
 
   canvas->Draw<RFrameTitle>(TString::Format("Large RH3D histogram with %d x %d x %d bins",nbins,nbins,nbins).Data());
 
   auto draw = canvas->Draw(pHist);
 
   draw->AttrLine().SetColor(RColor::kLime);
   // draw->Box(); // configure box draw option (default)
   // draw->Sphere(); // configure sphere draw option
   draw->Scatter(); // configure scatter draw option
   // draw->Color(); // configure color draw option
 
   draw->Optimize(true); // enable draw optimization, reduced data set will be send to clients
 
   //auto stat = canvas->Draw<RHist2StatBox>(pHist, "hist");
   //stat->AttrFill().SetColor(RColor::kBlue);
 
   canvas->SetSize(1000, 700);
   canvas->Show();
}

Date

2020-06-26

Warning

This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!

Author

Sergey Linev s.lin.nosp@m.ev@g.nosp@m.si.de

Definition in file draw_rh3_large.cxx.