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Reference Guide
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/RCanvas.hxx"
#include "ROOT/RFrameTitle.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
using namespace ROOT::Experimental;
void 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("Large 200x200x200 RH3 drawing");
auto frame = canvas->AddFrame();
// should we made special style for frame with palette?
// frame->margins.right = 0.2_normal;
frame->x.zoomMin = nbins*0.1;
frame->x.zoomMax = nbins*0.9;
frame->y.zoomMin = nbins*0.1;
frame->y.zoomMax = nbins*0.9;
frame->z.zoomMin = nbins*0.1;
frame->z.zoomMax = 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->line.color = 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->fill.color = RColor::kBlue;
// stat->fill.style = RAttrFill::kSolid;
canvas->SetSize(1000, 700);
Definition: Rtypes.h:472
const char * Data() const
Definition: TString.h:369
static TString Format(const char *fmt,...)
Static method which formats a string using a printf style format descriptor and return a TString.
Definition: TString.cxx:2336
This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
Sergey Linev s.lin.nosp@m.ev@g.nosp@m.si.de

Definition in file rh3_large.cxx.