92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
import sys
|
|
|
|
import pygame
|
|
|
|
from settings import Settings
|
|
from ship import Ship
|
|
from bullet import Bullet
|
|
|
|
|
|
class AlienInvasion:
|
|
"""Overall class to manage game assets and behavior."""
|
|
|
|
def __init__(self):
|
|
"""Initialize the game, and create game resources."""
|
|
pygame.init()
|
|
self.clock = pygame.time.Clock()
|
|
self.settings = Settings()
|
|
|
|
self.screen = pygame.display.set_mode(
|
|
(self.settings.screen_width, self.settings.screen_height))
|
|
pygame.display.set_caption("Alien Invasion")
|
|
|
|
self.ship = Ship(self)
|
|
self.bullets = pygame.sprite.Group()
|
|
|
|
def run_game(self):
|
|
"""Start the main loop for the game."""
|
|
while True:
|
|
self._check_events()
|
|
self.ship.update()
|
|
self._update_bullets()
|
|
self._update_screen()
|
|
self.clock.tick(60)
|
|
|
|
def _check_events(self):
|
|
"""Respond to keypresses and mouse events."""
|
|
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)
|
|
|
|
def _check_keydown_events(self, event):
|
|
"""Respond to keypresses."""
|
|
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_bullets(self):
|
|
"""Update position of bullets and get rid of old bullets."""
|
|
# Update bullet positions.
|
|
self.bullets.update()
|
|
|
|
# Get rid of bullets that have disappeared.
|
|
for bullet in self.bullets.copy():
|
|
if bullet.rect.bottom <= 0:
|
|
self.bullets.remove(bullet)
|
|
|
|
def _update_screen(self):
|
|
"""Update images on the screen, and flip to the new screen."""
|
|
self.screen.fill(self.settings.bg_color)
|
|
for bullet in self.bullets.sprites():
|
|
bullet.draw_bullet()
|
|
self.ship.blitme()
|
|
|
|
pygame.display.flip()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
# Make a game instance, and run the game.
|
|
ai = AlienInvasion()
|
|
ai.run_game() |