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alien_invasion.py
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alien_invasion.py
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import sys
from time import sleep
import pygame
from settings import Settings
from game_stats import GameStats
from scoreboard import Scoreboard
from button import Button
from ship import Ship
from bullet import Bullet
from alien import Alien
from utils import hide_mouse_cursor
class AlienInvasion:
def __init__(self):
pygame.init()
self.settings = Settings()
self.screen = pygame.display.set_mode((1200, 800))
pygame.display.set_caption('Alien Invasion')
self.stats = GameStats(self)
self.score_board = Scoreboard(self)
self.ship = Ship(self)
self.bullets = pygame.sprite.Group()
self.aliens = pygame.sprite.Group()
self.create_fleet_of_aliens()
self.play_button = Button(self, 'Play')
def run_game(self):
while True:
self.respond_to_events()
if self.stats.game_active:
self.ship.update()
self.update_bullet_positions()
self._update_aliens()
self._update_screen()
def respond_to_events(self):
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
self.check_keydown_events(event)
elif event.type == pygame.KEYUP:
self.check_keyup_events(event)
elif event.type == pygame.MOUSEBUTTONDOWN:
mouse_pos = pygame.mouse.get_pos()
self.start_game_if_player_clicks_play(mouse_pos)
def start_game_if_player_clicks_play(self, mouse_pos):
button_clicked = self.play_button.rect.collidepoint(mouse_pos)
if button_clicked and not self.stats.game_active:
self.reset_game_statistics()
self.reset_game_statistics()
self.remove_aliens_and_bullets()
self.create_new_fleet()
hide_mouse_cursor()
def reset_game_settings(self):
self.settings.initialize_dynamic_settings()
self.reset_game_statistics()
def remove_aliens_and_bullets(self):
self.aliens.empty()
self.bullets.empty()
def create_new_fleet(self):
self.create_fleet_of_aliens()
self.ship.align_center()
def reset_game_statistics(self):
self.stats.reset_stats()
self.stats.game_active = True
self.score_board.prep_score()
self.score_board.prep_level()
self.score_board.prep_ships()
def check_keydown_events(self, event):
if event.key == pygame.K_RIGHT:
self.ship.moving_right = True
elif event.key == pygame.K_LEFT:
self.ship.moving_left = True
elif event.key == pygame.K_q:
sys.exit()
elif event.key == pygame.K_SPACE:
self.fire_bullet()
def check_keyup_events(self, event):
"""Respond to key releases."""
if event.key == pygame.K_RIGHT:
self.ship.moving_right = False
elif event.key == pygame.K_LEFT:
self.ship.moving_left = False
def fire_bullet(self):
"""Create a new bullet and add it to the bullets group."""
if len(self.bullets) < self.settings.bullets_allowed:
new_bullet = Bullet(self)
self.bullets.add(new_bullet)
def update_bullet_positions(self):
self.bullets.update()
self.remove_bullets_that_have_disappeared()
self.manage_bullet_alien_collision()
def remove_bullets_that_have_disappeared(self):
for bullet in self.bullets.copy():
if bullet.rect.bottom <= 0:
self.bullets.remove(bullet)
def manage_bullet_alien_collision(self):
# Remove any bullets and aliens that have collided.
collisions = pygame.sprite.groupcollide(self.bullets, self.aliens, True, True)
if collisions:
for aliens in collisions.values():
self.stats.score += self.settings.alien_points * len(aliens)
self.score_board.prep_score()
self.score_board.check_high_score()
if not self.aliens:
self.increase_level()
def increase_level(self):
# Destroy existing bullets and create new fleet.
self.bullets.empty()
self.create_fleet_of_aliens()
self.settings.increase_speed()
# Increase level.
self.stats.level += 1
self.score_board.prep_level()
def _update_aliens(self):
"""
Check if the fleet is at an edge,
then update the positions of all aliens in the fleet.
"""
self._check_fleet_edges()
self.aliens.update()
# Look for alien-ship collisions.
if pygame.sprite.spritecollideany(self.ship, self.aliens):
self._ship_hit()
# Look for aliens hitting the bottom of the screen.
self._check_aliens_bottom()
def _check_aliens_bottom(self):
"""Check if any aliens have reached the bottom of the screen."""
screen_rect = self.screen.get_rect()
for alien in self.aliens.sprites():
if alien.rect.bottom >= screen_rect.bottom:
# Treat this the same as if the ship got hit.
self._ship_hit()
break
def _ship_hit(self):
"""Respond to the ship being hit by an alien."""
if self.stats.ships_left > 0:
# Decrement ships_left, and update scoreboard.
self.stats.ships_left -= 1
self.score_board.prep_ships()
# Get rid of any remaining aliens and bullets.
self.aliens.empty()
self.bullets.empty()
# Create a new fleet and center the ship.
self.create_fleet_of_aliens()
self.ship.align_center()
# Pause.
sleep(0.5)
else:
self.stats.game_active = False
pygame.mouse.set_visible(True)
def create_fleet_of_aliens(self):
# Create an alien and find the number of aliens in a row.
# Spacing between each alien is equal to one alien width.
alien = Alien(self)
alien_width, alien_height = alien.rect.size
available_space_x = self.settings.screen_width - (2 * alien_width)
number_aliens_x = available_space_x // (2 * alien_width)
# Determine the number of rows of aliens that fit on the screen.
ship_height = self.ship.rect.height
available_space_y = (self.settings.screen_height - (3 * alien_height) - ship_height)
number_rows = available_space_y // (2 * alien_height)
# Create the full fleet of aliens.
for row_number in range(number_rows):
for alien_number in range(number_aliens_x):
self.place_alien_in_row(alien_number, row_number)
def place_alien_in_row(self, alien_number, row_number):
alien = Alien(self)
alien_width, alien_height = alien.rect.size
alien.x = alien_width + 2 * alien_width * alien_number
alien.rect.x = alien.x
alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
self.aliens.add(alien)
def _check_fleet_edges(self):
"""Respond appropriately if any aliens have reached an edge."""
for alien in self.aliens.sprites():
if alien.check_edges():
self._change_fleet_direction()
break
def _change_fleet_direction(self):
"""Drop the entire fleet and change the fleet's direction."""
for alien in self.aliens.sprites():
alien.rect.y += self.settings.fleet_drop_speed
self.settings.fleet_direction *= -1
def _update_screen(self):
"""Update images on the screen, and flip to the new screen."""
self.screen.fill(self.settings.bg_color)
self.ship.draw()
for bullet in self.bullets.sprites():
bullet.draw_bullet()
self.aliens.draw(self.screen)
# Draw the score information.
self.score_board.show_score()
# Draw the play button if the game is inactive.
if not self.stats.game_active:
self.play_button.draw_button()
pygame.display.flip()