doc/v612/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/TColor.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).SetLineColor(Experimental::TColor::kRed);
   canvas->Show();
}