#!/usr/bin/env python3
#
# polar_plot
#
# Copyright (C) 2023, Cees Bassa
# GPLv3+

import numpy as np
import matplotlib.pyplot as plt

if __name__ == "__main__":
    fig = plt.figure(figsize=(8, 8))
    ax = fig.add_subplot(111, projection="polar")

    ax.set_theta_offset(np.pi / 2.0)
    ax.set_rticks([90, 60, 30, 0])
    ax.set_rgrids([90, 60, 30, 0], ["", "30$^\circ$", "60$^\circ$", ""], angle=22.5)
    ax.grid(True)
    ax.bar(0, 90).remove()
    ax.set_rmax(90.0)
    ax.set_ylim(0.0, 90.0)

    plt.show()