{
"cells": [
{
"cell_type": "markdown",
"id": "f2863788",
"metadata": {},
"source": [
"# gr017_time\n",
"\n",
"\n",
"\n",
"**Author:** Rene Brun \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."
]
},
{
"cell_type": "markdown",
"id": "f6bb845e",
"metadata": {},
"source": [
" Arguments are defined. "
]
},
{
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"execution_count": 1,
"id": "2a0bccf0",
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"execution": {
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"shell.execute_reply": "2026-05-19T20:38:06.429177Z"
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"outputs": [],
"source": [
"Int_t nsteps = 500;\n",
"Int_t np = 100;"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "d57b5f9b",
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"execution": {
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"output_type": "display_data"
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{
"name": "stderr",
"output_type": "stream",
"text": [
"input_line_53:4:1: warning: 'size' shadows a declaration with the same name in the 'std' namespace; use '::size' to reference this declaration\n",
"std::vector rr(np), phi(np), dr(np), size(np);\n",
"^\n",
"Info in : created default TCanvas with name c1\n"
]
}
],
"source": [
"if (np > 1000) np = 1000;\n",
"std::vector color(np);\n",
"std::vector rr(np), phi(np), dr(np), size(np);\n",
"TRandom3 r;\n",
"Double_t xmin = -10, xmax = 10, ymin = -10, ymax = 10;\n",
"auto g = new TGraphTime(nsteps, xmin, ymin, xmax, ymax);\n",
"g->SetTitle(\"TGraphTime demo;X domain;Y domain\");\n",
"for (Int_t i = 0; i < np; i++) { // calculate some object parameters\n",
" rr[i] = r.Uniform(0.1 * xmax, 0.2 * xmax);\n",
" phi[i] = r.Uniform(0, 2 * TMath::Pi());\n",
" dr[i] = r.Uniform(0, 1) * 0.9 * xmax / Double_t(nsteps);\n",
" Double_t rc = r.Rndm();\n",
" if (rc > 0.7)\n",
" color[i] = kYellow;\n",
" else if (rc > 0.3)\n",
" color[i] = kBlue;\n",
" else\n",
" color[i] = kRed;\n",
"\n",
" size[i] = r.Uniform(0.5, 6);\n",
"}\n",
"for (Int_t s = 0; s < nsteps; s++) { // fill the TGraphTime step by step\n",
" for (Int_t i = 0; i < np; i++) {\n",
" Double_t newr = rr[i] + dr[i] * s;\n",
" Double_t newsize = 0.2 + size[i] * TMath::Abs(TMath::Sin(newr + 10));\n",
" Double_t newphi = phi[i] + 0.01 * s;\n",
" Double_t xx = newr * TMath::Cos(newphi);\n",
" Double_t yy = newr * TMath::Sin(newphi);\n",
" TMarker *m = new TMarker(xx, yy, 20);\n",
" m->SetMarkerColor(color[i]);\n",
" m->SetMarkerSize(newsize);\n",
" g->Add(m, s);\n",
" if (i == np - 1)\n",
" g->Add(new TArrow(xmin, ymax, xx, yy, 0.02, \"-|>\"), s);\n",
" }\n",
" g->Add(new TPaveLabel(.90, .92, .98, .97, TString::Format(\"%d\", s + 1), \"brNDC\"), s);\n",
"}\n",
"\n",
"g->Draw();"
]
},
{
"cell_type": "markdown",
"id": "f2f35b03",
"metadata": {},
"source": [
"save object as animated gif\n",
"g->SaveAnimatedGif(\"gr17_time.gif\");"
]
},
{
"cell_type": "markdown",
"id": "e596b77b",
"metadata": {},
"source": [
"save object to a file"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "ad68cfce",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:07.337802Z",
"iopub.status.busy": "2026-05-19T20:38:07.337678Z",
"iopub.status.idle": "2026-05-19T20:38:07.549412Z",
"shell.execute_reply": "2026-05-19T20:38:07.548752Z"
}
},
"outputs": [],
"source": [
"auto f = TFile::Open(\"gr17_time.root\",\"recreate\");\n",
"f->WriteObject(g, \"g\");\n",
"delete f;"
]
},
{
"cell_type": "markdown",
"id": "8317e6c7",
"metadata": {},
"source": [
"to view this object in another session do\n",
"TFile::Open(\"gr17_time.root\");\n",
"g->Draw();"
]
},
{
"cell_type": "markdown",
"id": "f14d07b2",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "4d6a9aff",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:07.551207Z",
"iopub.status.busy": "2026-05-19T20:38:07.551094Z",
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"shell.execute_reply": "2026-05-19T20:38:07.762044Z"
}
},
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],
"source": [
"gROOT->GetListOfCanvases()->Draw()"
]
}
],
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"display_name": "ROOT C++",
"language": "c++",
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