alien_invasion.py

import pygame

from pygame.sprite import Group

#import settings class
from settings import Settings

#import ship class
from ship import Ship

#import game_functions class
import game_functions as gf

#import game stats
from game_stats import GameStats

#import game stats
from button import Button
from scoreboard import Scoreboard


def run_game():
	# Initialize game and create a screen object.
	pygame.init()

	ai_settings = Settings()

	screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
	pygame.display.set_caption("Alien Invasion")

	# Make the Play button.
	play_button = Button(ai_settings, screen, "Play")


	# Make a ship.
	ship = Ship(ai_settings, screen)

	# Make an alien.
	aliens = Group()

	# Make a group to store bullets in.
	bullets = Group()

	# Create the fleet of aliens.
	gf.create_fleet(ai_settings, screen, ship, aliens)

	# Create an instance to store game statistics and scoreboard.
	stats = GameStats(ai_settings)
	sb = Scoreboard(ai_settings, screen, stats)


	# Start the main loop for the game.
	while True:

		# Watch for keyboard and mouse events.
		gf.check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)

		if stats.game_active:
			"""run of there are ships left"""
			
			# Redraw the screen during each pass through the loop.
			ship.update()

			#update bullets status
			gf.update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets)

			#update aliens position
			gf.update_aliens(ai_settings, stats, sb, screen, ship, aliens, bullets)

		#redraw screen
		gf.update_screen(ai_settings, screen, stats, sb, aliens, ship, bullets, play_button)


run_game()