Logo ROOT  
Reference Guide
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/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
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->AttrMargins().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.

RFrame.hxx
ROOT::Experimental::RAxisConfig
Objects used to configure the different axis types.
Definition: RAxisConfig.hxx:35
RHistDrawable.hxx
TString::Data
const char * Data() const
Definition: TString.h:369
ROOT::Experimental::RColor::kLime
static constexpr R__DLLEXPORT RGB_t kLime
Definition: RColor.hxx:180
ROOT::Experimental::RCanvas::Create
static std::shared_ptr< RCanvas > Create(const std::string &title)
Create new canvas instance.
Definition: RCanvas.cxx:103
TString::Format
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:2333
RCanvas.hxx
TString.h
TCanvas::Show
void Show()
Show canvas.
Definition: TCanvas.cxx:2238
RHistStatBox.hxx
TCanvas::Draw
void Draw(Option_t *option="") override
Draw a canvas.
Definition: TCanvas.cxx:843
ROOT::Experimental
Definition: RDirectory.hxx:30
R__LOAD_LIBRARY
#define R__LOAD_LIBRARY(LIBRARY)
Definition: Rtypes.h:472