multigraphpalettecolor.C

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/// \file
/// \ingroup tutorial_graphs
/// \notebook
/// Palette coloring for multi-graphs is activated thanks to the options `PFC`
/// (Palette Fill Color), `PLC` (Palette Line Color) and `AMC` (Palette Marker Color).
/// When one of these options is given to `TMultiGraph::Draw` the `TGraph`s  in the
/// `TMultiGraph`get their color from the current color palette defined by
/// `gStyle->SetPalette(…)`. The color is determined according to the number of
/// `TGraph`s.
///
/// In this example four graphs are displayed with palette coloring for lines and
/// and markers. The color of each graph is picked inside the default palette `kBird`.
///
/// \macro_image
/// \macro_code
///
/// \author Olivier Couet

void multigraphpalettecolor()
{
   auto mg  = new TMultiGraph();

   auto gr1 = new TGraph(); gr1->SetMarkerStyle(20);
   auto gr2 = new TGraph(); gr2->SetMarkerStyle(21);
   auto gr3 = new TGraph(); gr3->SetMarkerStyle(23);
   auto gr4 = new TGraph(); gr4->SetMarkerStyle(24);

   Double_t dx = 6.28/100;
   Double_t x  = -3.14;

   for (int i=0; i<=100; i++) {
      x = x+dx;
      gr1->SetPoint(i,x,2.*TMath::Sin(x));
      gr2->SetPoint(i,x,TMath::Cos(x));
      gr3->SetPoint(i,x,TMath::Cos(x*x));
      gr4->SetPoint(i,x,TMath::Cos(x*x*x));
   }

   mg->Add(gr4,"PL");
   mg->Add(gr3,"PL");
   mg->Add(gr2,"*L");
   mg->Add(gr1,"PL");

   mg->Draw("A pmc plc");
}