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"# gr018_time2\n",
"a set of particles with their time stamp in a MonteCarlo program.\n",
"\n",
"See the [TGraphTime documentation](https://root.cern/doc/master/classTGraphTime.html)\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."
]
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" Arguments are defined. "
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"Int_t nsteps = 200;\n",
"Int_t np = 5000;"
]
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"text": [
"Info in : created default TCanvas with name c1\n"
]
}
],
"source": [
"if (np > 5000) np = 5000;\n",
"std::vector color(np);\n",
"std::vector cosphi(np), sinphi(np), speed(np);\n",
"TRandom3 r;\n",
"Double_t xmin = 0, xmax = 10, ymin = -10, ymax = 10;\n",
"TGraphTime *g = new TGraphTime(nsteps,xmin,ymin,xmax,ymax);\n",
"g->SetTitle(\"TGraphTime demo 2;X;Y\");\n",
"Double_t fact = xmax/Double_t(nsteps);\n",
"for (Int_t i = 0; i < np; i++) { // calculate some object parameters\n",
" speed[i] = r.Uniform(0.5, 1);\n",
" Double_t phi = r.Gaus(0, TMath::Pi() / 6.);\n",
" cosphi[i] = fact * speed[i] * TMath::Cos(phi);\n",
" sinphi[i] = fact * speed[i] * TMath::Sin(phi);\n",
" Double_t rc = r.Rndm();\n",
" color[i] = kRed;\n",
" if (rc > 0.3) color[i] = kBlue;\n",
" if (rc > 0.7) color[i] = kYellow;\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 xx = s*cosphi[i];\n",
" if (xx < xmin) continue;\n",
" Double_t yy = s*sinphi[i];\n",
" TMarker *m = new TMarker(xx,yy,25);\n",
" m->SetMarkerColor(color[i]);\n",
" m->SetMarkerSize(1.5 -s/(speed[i]*nsteps));\n",
" g->Add(m, s);\n",
" }\n",
" g->Add(new TPaveLabel(.70,.92,.98,.99,TString::Format(\"shower at %5.3f nsec\",3.*s/nsteps),\"brNDC\"),s);\n",
"}\n",
"\n",
"g->Draw();"
]
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{
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"metadata": {},
"source": [
"save object as animated gif\n",
"g->SaveAnimatedGif(\"gr18_time2.gif\");"
]
},
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"id": "87c2f66c",
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"source": [
"start animation, can be stopped with g->Animate(kFALSE);\n",
"g->Animate();"
]
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"id": "4ecf48d2",
"metadata": {},
"source": [
"Draw all canvases "
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"gROOT->GetListOfCanvases()->Draw()"
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