text: # round_ex1.py
  import numpy as np
  import matplotlib.pyplot as plt
  from xsect import round_points, plot_section
  
  fig = plt.figure(figsize=(7, 7))
  
  # Round
  ax1 = fig.add_subplot(221, title='Round', ylabel='Y', aspect='equal')
  points = round_points(10)
  plot_section(points, ax=ax1)
  
  # Pipe
  ax2 = fig.add_subplot(222, title='Pipe', aspect='equal')
  points = round_points(10, 2)
  plot_section(points, ax=ax2)
  
  # Pacman
  ax3 = fig.add_subplot(223, title='Pacman', xlabel='X', ylabel='Y', aspect='equal')
  points = round_points(10, 5, start=25*np.pi/180, stop=335*np.pi/180)
  plot_section(points, ax=ax3)
  
  # Cut pipe
  ax4 = fig.add_subplot(224, title='Cut Pipe', xlabel='X', aspect='equal')
  points = round_points(10, 2, start=-80*np.pi/180, stop=40*np.pi/180)
  plot_section(points, ax=ax4)
  