gr104_palettecolor.C

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/// \file
/// \ingroup tutorial_graphs
/// \notebook
/// \preview Palette coloring for 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 `TGraph::Draw` the `TGraph` get its color
/// from the current color palette defined by `gStyle->SetPalette(...)`. The color
/// is determined according to the number of objects having palette coloring in
/// the current pad.
///
/// In this example five graphs are displayed with palette coloring for lines and
/// and filled area. The graphs are drawn with curves (`C` option) and one can see
/// the color of each graph is picked inside the palette `kSolar`. The
/// same is visible on filled polygons in the automatically built legend.
/// To have more control on the legend, it can be created manually, see the graph
/// tutorial gr111_legend.C
///
/// \macro_image
/// \macro_code
/// \author Olivier Couet
 
void gr104_palettecolor () {
 
   gStyle->SetOptTitle(kFALSE);
   gStyle->SetPalette(kSolar);
 
   double x[5]  = {1,2,3,4,5};
   double y1[5] = {1.0,2.0,1.0,2.5,3.0};
   double y2[5] = {1.1,2.1,1.1,2.6,3.1};
   double y3[5] = {1.2,2.2,1.2,2.7,3.2};
   double y4[5] = {1.3,2.3,1.3,2.8,3.3};
   double y5[5] = {1.4,2.4,1.4,2.9,3.4};
 
   TGraph *g1 = new TGraph(5,x,y1); g1->SetTitle("Graph with a red star");
   TGraph *g2 = new TGraph(5,x,y2); g2->SetTitle("Graph with a circular marker");
   TGraph *g3 = new TGraph(5,x,y3); g3->SetTitle("Graph with an open square marker");
   TGraph *g4 = new TGraph(5,x,y4); g4->SetTitle("Graph with a blue star");
   TGraph *g5 = new TGraph(5,x,y5); g5->SetTitle("Graph with a full square marker");
 
   g1->SetLineWidth(3); g1->SetMarkerColor(kRed);
   g2->SetLineWidth(3); g2->SetMarkerStyle(kCircle);
   g3->SetLineWidth(3); g3->SetMarkerStyle(kOpenSquare);
   g4->SetLineWidth(3); g4->SetMarkerColor(kBlue);
   g5->SetLineWidth(3); g5->SetMarkerStyle(kFullSquare);
 
   // The Draw option "A" (draw axes) is needed (only) for the first drawn graph
   g1->Draw("CA* PLC PFC");
   g2->Draw("PC  PLC PFC");
   g3->Draw("PC  PLC PFC");
   g4->Draw("*C  PLC PFC");
   g5->Draw("PC  PLC PFC");
 
   gPad->BuildLegend();
}