TLegend entry for TMultigraph

Newbie
1

hi, im wonder how to set the entry option so that it shows the markerstyle as well,
also for option ‘l’ here how do i set the colour of the line?

cuna
cuna698×475 17.6 KB

{
      gROOT->Reset();
      gStyle->SetOptStat(0);

      TCanvas *c1 = new TCanvas("c1","multigraph",200,10,700,500);
      c1->SetGrid();

         // draw a frame to define the range
      TMultiGraph *mg = new TMultiGraph();

         // create first graph 4mu (value of siginificance 2 poisson)
      Int_t n1 = 12;
      Double_t x1[]  = {15.,20.,25.,30.,35.,40.,45.,50.,55.,60.,65.,70.};
      Double_t y1[]  = {1.34014,2.80971,3.273, 4.56457,5.68444, 6.17579, 6.59294, 6.93122, 7.00537, 7.31122,7.62571,9.6661};
      TGraph *gr1 = new TGraph(n1, x1, y1);
      gr1->SetLineColor(kBlue+1);
      gr1->SetMarkerColor(kBlue);
      gr1->SetMarkerStyle(21);
      mg->Add(gr1);
      

         // create second graph
      Int_t n2 = 12;
      Double_t x2[]  = {15.,20.,25.,30.,35.,40.,45.,50.,55.,60.,65.,70.};
      Double_t y2[]  = {0.773935,1.73089, 1.88757, 2.69389, 3.37225,3.63244,                      3.81842, 4.10579, 4.21114, 4.41434, 4.56194, 6.59822};
      
      TGraph *gr2 = new TGraph(n2, x2, y2);
      gr2->SetLineColor(kRed+1);
      gr2->SetMarkerColor(kRed);
      gr2->SetMarkerStyle(20);
      mg->Add(gr2);
      
      mg->GetXaxis()->SetTitle("mass of zd");
      mg->GetYaxis()->SetTitle("significance");
      mg->Draw("ACP");
    
      TLegend *leg = new TLegend(0.1,0.9,0.3,0.7);
       leg->SetHeader("Final State Channel","C");
       leg->SetTextSize(0.12);
       leg->AddEntry("gr1","4mu","l");
       leg->AddEntry("gr2","4e","l");
       leg->Draw();
    
       c1->SaveAs("significance.eps");
   }

thanks!

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ROOT Version: 6.22
Platform: mac catalina 10.15.7
Compiler: Not Provided

2

You can see all in the first example of the TLegend documentation.

1 Like
3

i deleted the TLegend and add few lines to TGraph, the auto built tlegend

 TGraph *gr2 = new TGraph(n2, x2, y2);
      gr2->SetName("gr2");
      gr2->SetTitle("h->zzd->4e"); 
      gr2->SetLineColor(kRed);
      gr2->SetMarkerColor(kRed);
      gr2->SetDrawOption("P");
      gr2->SetMarkerStyle(22);
      mg->Add(gr2);
      c1->BuildLegend();