draw_frame.cxx

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/// \file
/// \ingroup tutorial_v7
///
/// \macro_code
///
/// \date 2020-02-20
/// \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/RCanvas.hxx"
#include "ROOT/RColor.hxx"
#include "ROOT/RFrameTitle.hxx"
#include "ROOT/RFrame.hxx"
#include "ROOT/RHistDrawable.hxx"
#include "ROOT/RStyle.hxx"
#include "ROOT/RPad.hxx"
 
// 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;
 
auto style = std::make_shared<RStyle>(); // keep here to avoid destroy when leaving function scope
 
void draw_frame()
{
   // Create the histogram.
   RAxisConfig xaxis("x", 10, 0.1, 110.);
   RAxisConfig yaxis("y", {0., 1., 2., 3., 10.});
   auto pHist = std::make_shared<RH2D>(xaxis, yaxis);
 
   // Fill a few points.
   pHist->Fill({0.11, 1.02});
   pHist->Fill({5.54, 3.02});
   pHist->Fill({20.98, 1.02});
   pHist->Fill({20.90, 1.02});
   pHist->Fill({1.75, -0.02});
 
   // Create a canvas to be displayed.
   auto canvas = RCanvas::Create("Canvas Title");
 
   // Make divisions
   auto subpads = canvas->Divide(2,1);
 
   // configure RFrame with direct API calls
   auto frame1 = subpads[0][0]->GetOrCreateFrame();
   frame1->AttrFill().SetColor(RColor::kBlue);
   frame1->AttrBorder().SetColor(RColor::kRed);
   frame1->AttrBorder().SetWidth(3);
   frame1->Margins().SetTop(0.3_normal);
   frame1->Margins().SetBottom(0.1_normal);
   frame1->Margins().SetLeft(0.2_normal);
   frame1->Margins().SetRight(0.2_normal);
 
   frame1->AttrX().AttrLine().SetColor(RColor::kGreen);
   frame1->AttrY().AttrLine().SetColor(RColor::kBlue);
 
   frame1->AttrX().SetLog(true);
   frame1->AttrX().SetZoomMinMax(2.,80.);
   frame1->AttrY().SetMinMax(2,8);
 
   subpads[0][0]->Draw<RFrameTitle>("Frame1 title")->SetMargin(0.01_normal).SetHeight(0.05_normal);
 
   auto draw1 = subpads[0][0]->Draw(pHist);
 
   // create frame before drawing histograms
   auto frame2 = subpads[1][0]->GetOrCreateFrame();
 
   auto draw2 = subpads[1][0]->Draw(pHist);
 
   subpads[1][0]->Draw<RFrameTitle>("Frame2 title");
 
   style->ParseString("frame { margin_left: 0.3; margin_right: 0.3; x_line_color_name: blue; y_line_color_name: green; } \n title { margin: 0.02; height: 0.1; text_size: 20; }");
 
   subpads[1][0]->UseStyle(style);
 
   canvas->Show("");
}