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############################## Features ##############################

# 1. Reading ISS position will be in one thread

# 2. Writing to csv will be in another thread

# 3. Make a real-time plot visualizing the ISS position (x = longitude, y = latitutude). Plotting will be also in different thread

# 4. Read, write and visualize with different frequencies (eg. read every second, write every 5 seconds, visualize every 3 seconds)

import matplotlib.pyplot as plt

import numpy

import requests

from time import sleep

import threading

from matplotlib.animation import FuncAnimation

import csv

hl, = plt.plot([], []) #empty plot

plt.ylim(-360, 360) # set axis limits

plt.xlim(-360, 360)

new_data= [0,0]

location = {}

def get_location():

#A JSON request to retrieve the current longitude and latitude of the IIS space station (real time)

url = "http://api.open-notify.org/iss-now.json"

response = requests.get(url)

result = response.json()

global location

#Let's extract the required information

location = result["iss_position"]

lat = location["latitude"]

lon = location["longitude"]

#Output informationon screen

print("_ ISS location: ", lat, lon)

threading.Timer( 1, get_location).start()

def write_location():

lat = str(location["latitude"])

lon = str(location['longitude'])

print("_____ Write_location : ", lat, lon)

with open('location.csv', 'a', newline="", encoding="utf8") as file:

reader = csv.writer(file)

reader.writerows([[lat + ' ' + lon]])

threading.Timer( 5, write_location).start()

def update_line(hl, new_data):

# set x, y value for draw graph

hl.set_xdata(numpy.append(hl.get_xdata(), new_data[0]))

hl.set_ydata(numpy.append(hl.get_ydata(), new_data[1]))

plt.draw() # draw new data

plt.pause(3) # update graph every 0.5 second

def draw_location():

for _ in range(0, 50000):

global location

new_data[0] = float(location['latitude']) # x data

new_data[1] = float(location['longitude']) # y data

# new_data[0] = _ # x data

# new_data[1] = _ + 1 # y data

print("___ draw location", new_data[0], new_data[1])

update_line(hl, new_data)

if __name__ == '__main__':

get_location()

write_location()

draw_location()