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"# tornado\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Wim Lavrijsen \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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"source": [
"from ROOT import TCanvas, TView, TPolyMarker3D, TPaveText\n",
"from ROOT import gROOT, gBenchmark\n",
"from math import cos, sin, pi\n",
"\n",
"gBenchmark.Start( 'tornado' )\n",
"\n",
"d = 16\n",
"numberOfPoints = 200\n",
"numberOfCircles = 40"
]
},
{
"cell_type": "markdown",
"id": "309b8056",
"metadata": {},
"source": [
"create and open a canvas"
]
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"source": [
"sky = TCanvas( 'sky', 'Tornado', 300, 10, 700, 500 )\n",
"sky.SetFillColor( 14 )"
]
},
{
"cell_type": "markdown",
"id": "22a06828",
"metadata": {},
"source": [
"creating view"
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"name": "stdout",
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"text": [
"tornado : Real Time = 0.37 seconds Cpu Time = 0.25 seconds\n"
]
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"source": [
"view = TView.CreateView()\n",
"rng = numberOfCircles * d\n",
"view.SetRange( 0, 0, 0, 4.0*rng, 2.0*rng, rng )\n",
"\n",
"polymarkers = []\n",
"for j in range( d, numberOfCircles * d, d ):\n",
"\n",
" # create a PolyMarker3D\n",
" pm3d = TPolyMarker3D( numberOfPoints )\n",
"\n",
" # set points\n",
" for i in range( 1, numberOfPoints ) :\n",
" csin = sin( 2*pi / numberOfPoints * i ) + 1\n",
" ccos = cos( 2*pi / numberOfPoints * i ) + 1\n",
" esin = sin( 2*pi / (numberOfCircles*d) * j ) + 1\n",
" x = j * ( csin + esin );\n",
" y = j * ccos;\n",
" z = j;\n",
" pm3d.SetPoint( i, x, y, z );\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",
" # save a reference\n",
" polymarkers.append( pm3d )\n",
"\n",
"gBenchmark.Show( 'tornado' )\n",
"\n",
"ct = gBenchmark.GetCpuTime( 'tornado' )\n",
"timeStr = 'Execution time: %g sec.' % ct\n",
"\n",
"text = TPaveText( 0.1, 0.81, 0.9, 0.97 )\n",
"text.SetFillColor( 42 )\n",
"text.AddText( 'PyROOT example: tornado.py' )\n",
"text.AddText( timeStr )\n",
"text.Draw()\n",
"\n",
"sky.Update()"
]
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{
"cell_type": "markdown",
"id": "4bdd6701",
"metadata": {},
"source": [
"Draw all canvases "
]
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],
"source": [
"from ROOT import gROOT \n",
"gROOT.GetListOfCanvases().Draw()"
]
}
],
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