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"source": [
"# gr111_legend\n",
"\n",
"\n",
"\n",
"**Author:** Emanuele Chiamulera \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:38 PM."
]
},
{
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"auto c = new TCanvas(\"c\",\"\", 900, 800);\n",
"c->SetGrid();\n",
"\n",
"const Int_t n = 5;\n",
"Double_t x[n] = {-3.00, -2.68, -2.36, -2.05, -1.73};\n",
"Double_t y1[n] = {-0.98, -0.89, -0.71, -0.46, -0.16};\n",
"Double_t y2[n] = {-2.98, -2.89, -2.71, -2.46, -2.16};\n",
"\n",
"\n",
"TGraph *gr1 = new TGraph(n, x, y1); //Create the graph\n",
"gr1->SetLineColor(2);\n",
"gr1->SetLineWidth(4);\n",
"gr1->SetMarkerColor(4);\n",
"gr1->SetMarkerStyle(21);\n",
"gr1->SetTitle(\"Graph with legend\");\n",
"\n",
"TLegend *legend = new TLegend(0.1,0.7,0.38,0.9); //Create the TLegend object and define it's position \n",
"legend->SetHeader(\"Legend title\", \"C\"); //\"C\" Center alignment for the header (\"L\" Left and \"R\" Right)\n",
"legend->SetFillColor(kWhite);\n",
"legend->SetBorderSize(1);\n",
"legend->SetTextSize(0.04);\n",
"legend->AddEntry(gr1, \"Data points\", \"lp\"); // \"p\" for point marker, \"l\" for line, \"e\" for error bars if TGraphError is used.\n",
"\n",
"gr1->Draw(\"\");"
]
},
{
"cell_type": "markdown",
"id": "307430a2",
"metadata": {},
"source": [
"Draw the legend"
]
},
{
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"shell.execute_reply": "2026-05-19T20:38:28.985236Z"
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"outputs": [],
"source": [
"legend->Draw();"
]
},
{
"cell_type": "markdown",
"id": "9a90b32d",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "1ddb9994",
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],
"source": [
"gROOT->GetListOfCanvases()->Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "ROOT C++",
"language": "c++",
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