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tornado.C
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1/// \file
2/// \ingroup tutorial_graphics
3/// \notebook
4/// Show 3-d polymarker.
5///
6/// \macro_image
7/// \macro_code
8///
9/// \author Rene Brun
10
11void tornado()
12{
13 gBenchmark->Start("tornado");
14
15 double PI = 3.141592653;
16 int d = 16;
17 int numberOfPoints = 200;
18 int numberOfCircles = 40;
19
20 // create and open a canvas
21 TCanvas *sky = new TCanvas("sky", "Tornado", 300, 10, 700, 500);
22 sky->SetFillColor(14);
23
24 // creating view
25 TView *view = TView::CreateView(1, 0, 0);
26 float range = numberOfCircles * d;
27 view->SetRange(0, 0, 0, 4.0 * range, 2.0 * range, range);
28
29 for (int j = d; j < numberOfCircles * d; j += d) {
30
31 // create a PolyMarker3D
33
34 float x, y, z;
35
36 // set points
37 for (int i = 1; i < numberOfPoints; i++) {
38 float csin = sin(2 * PI / (double)numberOfPoints * (double)i) + 1;
39 float ccos = cos(2 * PI / (double)numberOfPoints * (double)i) + 1;
40 float esin = sin(2 * PI / (double)(numberOfCircles * d) * (double)j) + 1;
41 x = j * (csin + esin);
42 y = j * ccos;
43 z = j;
44 pm3d->SetPoint(i, x, y, z);
45 }
46
47 // set marker size, color & style
48 pm3d->SetMarkerSize(1);
49 pm3d->SetMarkerColor(2 + (d == (j & d)));
50 pm3d->SetMarkerStyle(3);
51
52 // draw
53 pm3d->Draw();
54 }
55
56 char timeStr[60];
57 gBenchmark->Show("tornado");
58
59 Float_t ct = gBenchmark->GetCpuTime("tornado");
60 sprintf(timeStr, "Execution time: %g sec.", ct);
61
62 TPaveText *text = new TPaveText(0.1, 0.81, 0.9, 0.97);
63 text->SetFillColor(42);
64 text->AddText("ROOT example: tornado.C");
65 text->AddText(timeStr);
66 text->Draw();
67 sky->Update();
68}
#define d(i)
Definition RSha256.hxx:102
float Float_t
Definition RtypesCore.h:57
#define PI
R__EXTERN TBenchmark * gBenchmark
Definition TBenchmark.h:59
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Option_t Option_t TPoint TPoint const char text
virtual void Start(const char *name)
Starts Benchmark with the specified name.
virtual void Show(const char *name)
Stops Benchmark name and Prints results.
Float_t GetCpuTime(const char *name)
Returns Cpu time used by Benchmark name.
The Canvas class.
Definition TCanvas.h:23
A Pave (see TPave) with text, lines or/and boxes inside.
Definition TPaveText.h:21
A 3D polymarker.
See TView3D.
Definition TView.h:25
static TView * CreateView(Int_t system=1, const Double_t *rmin=nullptr, const Double_t *rmax=nullptr)
Create a concrete default 3-d view via the plug-in manager.
Definition TView.cxx:27
virtual void SetRange(const Double_t *min, const Double_t *max)=0
Double_t y[n]
Definition legend1.C:17
Double_t x[n]
Definition legend1.C:17