gr105_multigraphpalettecolor.C

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/// \file
/// \ingroup tutorial_graphs
/// \notebook
/// \preview 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 TGraphs  in the
/// TMultiGraph get their color from the current color palette defined by
/// gStyle->SetPalette(...). The color is determined according to the number of
/// TGraphs.
///
/// 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 gr105_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");
}