gr014_polar3.C File Reference

Detailed Description

Create a polar graph using a TF1 and draw it with PI axis.

See the TGraphPolar documentation

Since TGraphPolar is a TGraphErrors, it is painted with TGraphPainter options.

 
void gr014_polar3()
{
   TCanvas *CPol = new TCanvas("CPol","TGraphPolar Examples",500,500);
 
   Double_t rmin = 0;
   Double_t rmax = TMath::Pi()*2;
   Double_t r[1000];
   Double_t theta[1000];
 
   TF1 *fp1 = new TF1("fplot","cos(x)",rmin,rmax);
   for (Int_t ipt = 0; ipt < 1000; ipt++) {
      r[ipt] = ipt*(rmax-rmin)/1000+rmin;
      theta[ipt] = fp1->Eval(r[ipt]);
   }
 
   TGraphPolar *grP1 = new TGraphPolar(1000, r, theta);
   grP1->SetTitle("");
   grP1->SetLineColor(2);
   grP1->Draw("AOL");
}

Author

Olivier Couet

Definition in file gr014_polar3.C.