doc/v610/draw_8cxx.html

/*************************************************************************
 * 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(libGpad);
#include "ROOT/THist.hxx"
#include "ROOT/TCanvas.hxx"
#include "ROOT/TDirectory.hxx"
void draw() {
  using namespace ROOT;
  // Create the histogram.
  Experimental::TAxisConfig xaxis("x", 10, 0., 1.);
  Experimental::TAxisConfig yaxis("y", {0., 1., 2., 3.,10.});
  auto pHist = std::make_shared<Experimental::TH2D>(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.
  Experimental::TDirectory::Heap().Add("hist", pHist);
  // Create a canvas to be displayed.
  auto canvas = Experimental::TCanvas::Create("Canvas Title");
  canvas->Draw(pHist);
}