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"# tornado\n",
"\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 08:37 PM."
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"gBenchmark->Start(\"tornado\");\n",
"\n",
"double PI = 3.141592653;\n",
"int d = 16;\n",
"int numberOfPoints = 200;\n",
"int numberOfCircles = 40;"
]
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"id": "e3d0a0df",
"metadata": {},
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"create and open a canvas"
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"TCanvas *sky = new TCanvas(\"sky\", \"Tornado\", 300, 10, 700, 500);\n",
"sky->SetFillColor(14);"
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"source": [
"creating view"
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"tornado : Real Time = 0.56 seconds Cpu Time = 0.28 seconds\n"
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"TView *view = TView::CreateView(1, 0, 0);\n",
"float range = numberOfCircles * d;\n",
"view->SetRange(0, 0, 0, 4.0 * range, 2.0 * range, range);\n",
"\n",
"for (int j = d; j < numberOfCircles * d; j += d) {\n",
"\n",
" // create a PolyMarker3D\n",
" TPolyMarker3D *pm3d = new TPolyMarker3D(numberOfPoints);\n",
"\n",
" float x, y, z;\n",
"\n",
" // set points\n",
" for (int i = 1; i < numberOfPoints; i++) {\n",
" float csin = sin(2 * PI / (double)numberOfPoints * (double)i) + 1;\n",
" float ccos = cos(2 * PI / (double)numberOfPoints * (double)i) + 1;\n",
" float esin = sin(2 * PI / (double)(numberOfCircles * d) * (double)j) + 1;\n",
" x = j * (csin + esin);\n",
" y = j * ccos;\n",
" z = j;\n",
" pm3d->SetPoint(i, x, y, z);\n",
" }\n",
"\n",
" // set marker size, color & style\n",
" pm3d->SetMarkerSize(1);\n",
" pm3d->SetMarkerColor(2 + (d == (j & d)));\n",
" pm3d->SetMarkerStyle(3);\n",
"\n",
" // draw\n",
" pm3d->Draw();\n",
"}\n",
"\n",
"gBenchmark->Show(\"tornado\");\n",
"\n",
"Float_t ct = gBenchmark->GetCpuTime(\"tornado\");\n",
"\n",
"TPaveText *text = new TPaveText(0.1, 0.81, 0.9, 0.97);\n",
"text->SetFillColor(42);\n",
"text->AddText(\"ROOT example: tornado.C\");\n",
"text->AddText(Form(\"Execution time: %g sec.\", ct));\n",
"text->Draw();\n",
"sky->Update();"
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