/// \file /// \ingroup tutorial_graphs /// \notebook /// Draw a graph with text attached to each point. /// The text is drawn in a TExec function attached to the TGraph, /// therefore if the a graph's point is /// moved interactively, the text will be automatically updated. /// /// \macro_image /// \macro_code /// /// \author Olivier Couet void graphtext() { TCanvas *c = new TCanvas("c","A Simple Graph Example with Text",700,500); c->SetGrid(); const Int_t n = 10; auto gr = new TGraph(n); gr->SetTitle("A Simple Graph Example with Text"); gr->SetMarkerStyle(20); auto ex = new TExec("ex","drawtext();"); gr->GetListOfFunctions()->Add(ex); Double_t x, y; for (Int_t i=0;iSetPoint(i,x,y); } gr->Draw("ALP"); } void drawtext() { Int_t i,n; Double_t x,y; TLatex l; l.SetTextSize(0.025); l.SetTextFont(42); l.SetTextAlign(21); l.SetTextColor(kBlue); auto g = (TGraph*)gPad->GetListOfPrimitives()->FindObject("Graph"); n = g->GetN(); for (i=0; iGetPoint(i,x,y); l.PaintText(x,y+0.2,Form("(%4.2f,%4.2f)",x,y)); } }