rh2_colz.cxx

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/// \file
/// \ingroup tutorial_rcanvas
///
/// This macro generates a small V7 TH2D, fills it with random values and
/// draw it in a V7 canvas, using configured web browser
///
/// \macro_image (rcanvas_js)
/// \macro_code
///
/// \date 2020-03-04
/// \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.linev@gsi.de>
 
/*************************************************************************
 * 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/RHistDrawable.hxx"
#include "ROOT/RCanvas.hxx"
#include "ROOT/RFrameTitle.hxx"
#include "ROOT/RPaletteDrawable.hxx"
#include "ROOT/RHistStatBox.hxx"
#include "ROOT/RFrame.hxx"
#include "TRandom.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 rh2_colz()
{
   // Create the histogram.
   RAxisConfig xaxis("x", 20, 0., 10.);
   RAxisConfig yaxis("y", 20, 0., 10.);
   auto pHist = std::make_shared<RH2D>(xaxis, yaxis);
 
   for (int n=0;n<10000;n++)
      pHist->Fill({gRandom->Gaus(5.,2.), gRandom->Gaus(5.,2.)});
 
   // Create a canvas to be displayed.
   auto canvas = RCanvas::Create("RH2 with color palette");
 
   auto frame = canvas->AddFrame();
 
   // should we made special style for frame with palette?
   frame->margins.right = 0.2_normal;
 
   frame->gridX = false;
   frame->gridY = false;
 
   // draw ticks on both sides
   frame->ticksX = 2;
   frame->ticksY = 2;
 
   // swap frame side where axes are drawn
   // frame->swapX = true;
   // frame->swapY = true;
 
   frame->x.zoomMin = 2;
   frame->x.zoomMax = 8;
   frame->y.zoomMin = 2;
   frame->y.zoomMax = 8;
 
   auto title = canvas->Draw<RFrameTitle>("2D histogram with color palette");
   title->margin = 0.01_normal;
   title->height = 0.09_normal;
 
   canvas->Draw<RPaletteDrawable>(RPalette::GetPalette(), true);
 
   auto draw = canvas->Draw(pHist);
   // draw->line.color = RColor::kLime;
   // draw->Surf(2); // configure surf4 draw option
   // draw->Lego(2); // configure lego2 draw option
   // draw->Contour(); // configure cont draw option
   // draw->Scatter(); // configure color draw option (default)
   // draw->Arrow(); // configure arrow draw option
   draw->Color(); // configure color draw option (default)
   draw->Text(); // configure text drawing (can be enabled with most 2d options)
 
   auto stat = canvas->Draw<RHist2StatBox>(pHist, "hist2");
   stat->fill.color = RColor::kRed;
   stat->fill.style = RAttrFill::kSolid;
 
   canvas->SetSize(1000, 700);
   canvas->Show();
 
   //canvas->Show("1000x700");
 
   // canvas->SaveAs("rh2_colz.png");
}