accessiblecolorschemes.C

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/// \file
/// \ingroup tutorial_graphics
/// \notebook
/// Choosing an appropriate color scheme is essential for making results easy to understand and
/// interpret. Factors like colorblindness and converting colors to grayscale for publications
/// can impact accessibility. Furthermore, results should be aesthetically pleasing. The following
/// three color schemes, recommended by M. Petroff in [arXiv:2107.02270v2](https://arxiv.org/pdf/2107.02270)
/// and available on [GitHub](https://github.com/mpetroff/accessible-color-cycles)
/// under the MIT License, meet these criteria.
///
/// \macro_image
/// \macro_code
///
/// \author Olivier Couet
 
void box(double x1, double y1, double x2, double y2,int col) {
   auto b1 = new TBox(x1, y1, x2, y2);
   b1->SetFillColor(col);
   b1->Draw();
 
   TColor *c = gROOT->GetColor(col);
   auto tc = new TLatex((x2+x1)/2., 0.01+(y2+y1)/2., Form("#splitline{%s}{%s}",c->GetName(),c->GetTitle()));
   tc->SetTextFont(42);
   tc->SetTextAlign(23);
   tc->SetTextSize(0.020);
   tc->Draw();
}
 
void accessiblecolorschemes() {
   auto C = new TCanvas("C","C",600,800);
   int c;
   double x, y;
   double w = 0.2;
   double h = 0.08;
   auto t = new TText();
   t->SetTextSize(0.025);
   t->SetTextFont(42);
 
   // 6-colors scheme
   x = 0.1;
   y = 0.1;
   t->DrawText(x, y-h/2., "6-colors scheme");
   for (c=kP6Blue; c<kP6Blue+6; c++) {
      box(x, y, x+w, y+h,c);
      y = y+h;
   }
 
   // 8-color scheme
   y = 0.1;
   x = 0.4;
   t->DrawText(x, y-h/2., "8-colors scheme");
   for (c=kP8Blue; c<kP8Blue+8; c++) {
      box(x, y, x+w, y+h,c);
      y = y+h;
   }
 
   // 10-color scheme
   y = 0.1;
   x = 0.7;
   t->DrawText(x, y-h/2., "10-colors scheme");
   for (c=kP10Blue; c<kP10Blue+10; c++) {
      box(x, y, x+w, y+h,c);
      y = y+h;
   }
}