"create a wall"

import numpy as np

import matplotlib.pyplot as plt

import sys

def main(distance):

    theta = np.arange(-45 / 180 * np.pi, 45 / 180 * np.pi, 1 / 180 * np.pi)

    tmp = np.cos(theta)

    wall = distance / tmp

    with open("dis.csv",mode = 'w') as file:

        counter = 0

        s = ''

        for n in wall:

            s += str("%d,"%n)

            counter += 1

        while counter < 360:

            s += "0,"

            counter += 1

        file.write(s)

        file.close()

    lin = np.linspace(distance+1000,distance+1000,len(theta))

    plt.polar(theta, wall)

    plt.polar(theta, lin)

    plt.show()

if __name__ == "__main__":

    main(int(sys.argv[1]))

python buildwall.py 3000