gr014_polar3.py 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.

 
import math
 
import numpy as np
import ROOT
 
CPol = ROOT.TCanvas("CPol", "TGraphPolar Examples", 500, 500)
 
rmin = 0
rmax = math.pi * 2
r = np.array([])
theta = np.array([])
 
fp1 = ROOT.TF1("fplot", "cos(x)", rmin, rmax)
for ipt in range(1000):
    r = np.append(r, ipt * (rmax - rmin) / 1000 + rmin)
    theta = np.append(theta, fp1.Eval(r[ipt]))
 
grP1 = ROOT.TGraphPolar(1000, r, theta)
grP1.SetTitle("")
grP1.SetLineColor(2)
grP1.Draw("AOL")

Author

Olivier Couet, Jamie Gooding

Definition in file gr014_polar3.py.