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graphpolar3.C
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1/// \file
2/// \ingroup tutorial_graphs
3/// \notebook
4/// Create and draw a polar graph with PI axis using a TF1.
5///
6/// \macro_image
7/// \macro_code
8///
9/// \author Olivier Couet
10
11void graphpolar3()
12{
13 TCanvas *CPol = new TCanvas("CPol","TGraphPolar Examples",500,500);
14
15 Double_t rmin = 0;
16 Double_t rmax = TMath::Pi()*2;
17 Double_t r[1000];
18 Double_t theta[1000];
19
20 TF1 *fp1 = new TF1("fplot","cos(x)",rmin,rmax);
21 for (Int_t ipt = 0; ipt < 1000; ipt++) {
22 r[ipt] = ipt*(rmax-rmin)/1000+rmin;
23 theta[ipt] = fp1->Eval(r[ipt]);
24 }
25
26 TGraphPolar *grP1 = new TGraphPolar(1000, r, theta);
27 grP1->SetTitle("");
28 grP1->SetLineColor(2);
29 grP1->Draw("AOL");
30}
int Int_t
Definition: RtypesCore.h:45
double Double_t
Definition: RtypesCore.h:59
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t r
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
The Canvas class.
Definition: TCanvas.h:23
1-Dim function class
Definition: TF1.h:213
virtual Double_t Eval(Double_t x, Double_t y=0, Double_t z=0, Double_t t=0) const
Evaluate this function.
Definition: TF1.cxx:1455
To draw a polar graph.
Definition: TGraphPolar.h:23
void Draw(Option_t *options="") override
Draw TGraphPolar.
void SetTitle(const char *title="") override
Change (i.e.
Definition: TGraph.cxx:2338
constexpr Double_t Pi()
Definition: TMath.h:37