#!/usr/bin/env python
# coding: utf-8

# # Building a polar graph in a square Canvas
# Ported to nootbook by: Theis Hansen

# In[1]:


from ROOTaaS.iPyROOT import ROOT
ROOT.toCpp()


# ### The Graph
# We create a new canvas using TCanvas. We then set rmin to 0 and rmax to the value of Pi times 6, the latter is done by calling on ROOT's mathematical toolkit using TMath. 
# We state the number of points that we would like on the graph.
# We then write a loop too construct the graph.
# And we set the title, line width, color finally and we draw it!

# In[2]:


TCanvas c("myCanvas","myCanvas",600,600);
Double_t rmin=0.;
Double_t rmax=TMath::Pi()*6.;
const Int_t npoints=1000;
Double_t r[npoints];
Double_t theta[npoints];
for (Int_t ipt = 0; ipt < npoints; ipt++) {
    r[ipt] = ipt*(rmax-rmin)/npoints+rmin;
    theta[ipt] = TMath::Sin(r[ipt]);
}
TGraphPolar grP1 (npoints,r,theta);
grP1.SetTitle("A Fan");
grP1.SetLineWidth(3);
grP1.SetLineColor(2);

grP1.DrawClone("L");


# In[ ]: