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Reference Guide
graphpolar.C File Reference

Detailed Description

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Create and draw a polar graph.

void graphpolar()
{
// Illustrates how to use TGraphPolar
TCanvas * CPol = new TCanvas("CPol","TGraphPolar Examples",1200,600);
CPol->Divide(2,1);
CPol->cd(1);
Double_t x[1000];
Double_t y[1000];
Double_t xval1[20];
Double_t yval1[20];
TF1 * fplot = new TF1("fplot","cos(2*x)*cos(20*x)",xmin,xmax);
for (Int_t ipt = 0; ipt < 1000; ipt++){
x[ipt] = ipt*(xmax-xmin)/1000+xmin;
y[ipt] = fplot->Eval(x[ipt]);
}
TGraphPolar * grP = new TGraphPolar(1000,x,y);
grP->SetLineColor(2);
grP->SetLineWidth(2);
grP->SetFillStyle(3012);
grP->SetFillColor(2);
grP->Draw("AFL");
for (Int_t ipt = 0; ipt < 20; ipt++){
xval1[ipt] = x[1000/20*ipt];
yval1[ipt] = y[1000/20*ipt];
}
TGraphPolar * grP1 = new TGraphPolar(20,xval1,yval1);
grP1->SetMarkerStyle(29);
grP1->SetMarkerSize(2);
grP1->SetMarkerColor(4);
grP1->SetLineColor(4);
grP1->Draw("CP");
// Update, otherwise GetPolargram returns 0
CPol->Update();
if (grP1->GetPolargram()) {
grP1->GetPolargram()->SetNdivPolar(703);
}
CPol->cd(2);
Double_t x2[30];
Double_t y2[30];
Double_t ex[30];
Double_t ey[30];
for (Int_t ipt = 0; ipt < 30; ipt++){
x2[ipt] = x[1000/30*ipt];
y2[ipt] = 1.2 + 0.4*sin(TMath::Pi()*2*ipt/30);
ex[ipt] = 0.2+0.1*cos(2*TMath::Pi()/30*ipt);
ey[ipt] = 0.2;
}
TGraphPolar * grPE = new TGraphPolar(30,x2,y2,ex,ey);
grPE->SetMarkerStyle(22);
grPE->SetMarkerSize(1.5);
grPE->SetMarkerColor(5);
grPE->SetLineColor(6);
grPE->SetLineWidth(2);
grPE->Draw("EP");
// Update, otherwise GetPolargram returns 0
CPol->Update();
if (grPE->GetPolargram()) {
grPE->GetPolargram()->SetTextSize(0.03);
grPE->GetPolargram()->SetTwoPi();
}
}
int Int_t
Definition: RtypesCore.h:45
double Double_t
Definition: RtypesCore.h:59
Option_t Option_t TPoint TPoint const char x2
Option_t Option_t TPoint TPoint const char y2
float xmin
Definition: THbookFile.cxx:95
float xmax
Definition: THbookFile.cxx:95
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition: TAttFill.h:37
virtual void SetFillStyle(Style_t fstyle)
Set the fill area style.
Definition: TAttFill.h:39
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition: TAttLine.h:43
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition: TAttMarker.h:38
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition: TAttMarker.h:40
virtual void SetMarkerSize(Size_t msize=1)
Set the marker size.
Definition: TAttMarker.h:45
virtual void SetTextColor(Color_t tcolor=1)
Set the text color.
Definition: TAttText.h:44
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition: TAttText.h:47
The Canvas class.
Definition: TCanvas.h:23
TVirtualPad * cd(Int_t subpadnumber=0) override
Set current canvas & pad.
Definition: TCanvas.cxx:711
void Update() override
Update canvas pad buffers.
Definition: TCanvas.cxx:2478
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
TGraphPolargram * GetPolargram()
Definition: TGraphPolar.h:39
void Draw(Option_t *options="") override
Draw TGraphPolar.
void SetRangePolar(Double_t tmin, Double_t tmax)
Allows to change range Polar.
void SetTwoPi()
Set range from 0 to 2*pi.
void SetNdivPolar(Int_t Ndiv=508)
Set the number of Polar divisions: enter a number ij with 0<i<99 and 0<j<99.
void SetToRadian()
The Polar circle is labelled using radian.
void Divide(Int_t nx=1, Int_t ny=1, Float_t xmargin=0.01, Float_t ymargin=0.01, Int_t color=0) override
Automatic pad generation by division.
Definition: TPad.cxx:1153
RVec< PromoteType< T > > cos(const RVec< T > &v)
Definition: RVec.hxx:1798
RVec< PromoteType< T > > sin(const RVec< T > &v)
Definition: RVec.hxx:1797
Double_t y[n]
Definition: legend1.C:17
Double_t x[n]
Definition: legend1.C:17
Double_t ey[n]
Definition: legend1.C:17
Double_t ex[n]
Definition: legend1.C:17
constexpr Double_t Pi()
Definition: TMath.h:37
Author
Olivier Couet

Definition in file graphpolar.C.