Elite:Dangerous: Bearing Calculator

#!/usr/bin/env python3

# Version 5

# POSTED ONLINE: https://pastebin.com/krGma4Z3

# Colors.
BLACK = '\033[30m'
RED = '\033[31m'
GREEN = '\033[32m'
YELLOW = '\033[33m'
BLUE = '\033[34m'
MAGENTA = '\033[35m'
CYAN = '\033[36m'
WHITE = '\033[37m'
BRIGHT_BLACK = '\033[90m'
BRIGHT_RED = '\033[91m'
BRIGHT_GREEN = '\033[92m'
BRIGHT_YELLOW = '\033[93m'
BRIGHT_BLUE = '\033[94m'
BRIGHT_MAGENTA = '\033[95m'
BRIGHT_CYAN = '\033[96m'
BRIGHT_WHITE = '\033[97m'

# Styles.
RESET = '\033[0m' # Reset all styles.
BOLD = '\033[1m'
HALF_BRIGHT = '\033[2m'
ITALIC = '\033[3m'
UNDERLINE = '\033[4m'
REVERSED = '\033[7m' # Reverse foreground and background colors.

def color(var, color):
    return color + str(var) + RESET

import os
def clear():
    os.system('cls' if os.name in ('nt', 'dos') else 'clear')

# -----

def wait_for_any_keypress():
    import sys
    if sys.platform == 'win32':
        import os
        os.system('pause')
    elif sys.platform.startswith('linux') or sys.platform == 'darwin':
        print('Press any key to continue . . .')
        import termios
        import tty
        stdin_file_desc = sys.stdin.fileno()
        old_stdin_tty_attr = termios.tcgetattr(stdin_file_desc)
        try:
            tty.setraw(stdin_file_desc)
            sys.stdin.read(1)
        finally:
            termios.tcsetattr(stdin_file_desc, termios.TCSADRAIN, old_stdin_tty_attr)

# ------

import math

def calculate_bearing(lat1, lon1, lat2, lon2):
    # Convert latitude and longitude from degrees to radians
    lat1 = math.radians(lat1)
    lon1 = math.radians(lon1)
    lat2 = math.radians(lat2)
    lon2 = math.radians(lon2)

    # Bearing formula.
    # SOURCE: https://www.movable-type.co.uk/scripts/latlong.html
    dlon = lon2 - lon1
    y = math.sin(dlon) * math.cos(lat2)
    x = math.cos(lat1) * math.sin(lat2) - math.sin(lat1) * math.cos(lat2) * math.cos(dlon)
    theta = math.atan2(y, x)
    bearing = (math.degrees(theta) + 360) % 360
    return bearing

def main():
    while True:
        try:
            clear()

            print(color('Position ', BRIGHT_BLUE), end='')
            inputs = input(color('Destination: ', RED))

            # Replace commas with spaces and split into a list.
            inputs = inputs.replace(',', ' ').split(' ')

            # Remove empty strings.
            inputs = list(filter(None, inputs))

            if len(inputs) != 4:
                raise ValueError('Expected Input: Position-Latitude Position-Longitude Destination-Latitude Destination-Longitude')

            latitude_1 = float(inputs[0])
            longitude_1 = float(inputs[1])
            latitude_2 = float(inputs[2])
            longitude_2 = float(inputs[3])

            bearing = calculate_bearing(latitude_1, longitude_1, latitude_2, longitude_2)

            print()
            print(f'{color('Bearing:', BRIGHT_GREEN)} {bearing:.2f}°')

        except Exception as e:
            print()
            print(e)

        print()
        wait_for_any_keypress()

if __name__ == '__main__':
    main()