"""
Demo of a line plot on a polar axis.
"""
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.backends.backend_pgf import FigureCanvasPgf
import matplotlib as mpl
mpl.backend_bases.register_backend('pdf', FigureCanvasPgf)
from matplotlib.ticker import OldScalarFormatter, ScalarFormatter


with plt.rc_context({'text.usetex' : True,
                     'font.family' : 'Times New Roman',
                     'font.serif': 'Times New Roman', # --> no error when using Times New Roman
                     'mathtext.fontset' : 'custom',
                     'mathtext.cal' : 'serif:cursive',
                     'mathtext.rm'  : 'serif',
                     'mathtext.tt'  : 'monospace',
                     'mathtext.it'  : 'serif:italic',
                     'mathtext.bf'  : 'serif:bold',
                     'mathtext.sf'  : 'sans',
                     'text.latex.unicode' : True,
                     'pgf.rcfonts'         : True}):
    r = np.arange(0, 3.0, 0.01)
    theta = 2 * np.pi * r
    r = r*1000000
    #ax = plt.subplot(111, projection='polar')
    ax = plt.subplot(111)
    ax.plot(theta, r, color='b', linewidth=3)
    ax.yaxis.major.formatter._useMathText = True
    ax.xaxis.major.formatter._useMathText = True
    ax.grid(True)
    print(ax.get_xaxis().get_major_formatter())
    #ax.xaxis.set_major_formatter(OldScalarFormatter())
    #ax.yaxis.set_major_formatter(OldScalarFormatter())

    #plt.title(r'Some text with latex in it  $10_4 \times \theta = \Phi$')
    plt.savefig(r'Test_text_embedded_on.pdf', papertype='None')
    plt.show()