draw.cxx

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/// \file
/// \ingroup tutorial_v7
///
/// \macro_code
///
/// \date 2015-03-22
/// \warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback
/// is welcome!
/// \author Axel Naumann <axel@cern.ch>
 
/*************************************************************************
 * Copyright (C) 1995-2015, 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 "Rtypes.h"
 
R__LOAD_LIBRARY(libROOTHistDraw);
 
#include "ROOT/RHist.hxx"
#include "ROOT/RCanvas.hxx"
#include "ROOT/RColor.hxx"
#include "ROOT/TDirectory.hxx"
 
void draw()
{
   using namespace ROOT::Experimental;
 
   // Create the histogram.
   RAxisConfig xaxis("x", 10, 0., 1.);
   RAxisConfig yaxis("y", {0., 1., 2., 3., 10.});
   auto pHist = std::make_shared<RH2D>(xaxis, yaxis);
 
   // Fill a few points.
   pHist->Fill({0.01, 1.02});
   pHist->Fill({0.54, 3.02});
   pHist->Fill({0.98, 1.02});
   pHist->Fill({1.90, 1.02});
   pHist->Fill({0.75, -0.02});
 
   // Register the histogram with ROOT: now it lives even after draw() ends.
   ROOT::Experimental::TDirectory::Heap().Add("hist", pHist);
 
   // Create a canvas to be displayed.
   auto canvas = RCanvas::Create("Canvas Title");
   canvas->Draw(pHist)->SetLineColor(RColor::kRed);
 
   canvas->Show();
}