pygame实现外星人大战小游戏——飞船创建

参考资料：Python编程从入门到实践

#alien_invasion.py
import pygame
from settings import Settings
from ship import Ship
import game_functions as gf
def run_game():
    pygame.init()
    ai_settings = Settings()
    screen = pygame.display.set_mode(
        (ai_settings.screen_width,ai_settings.screen_height))
    pygame.display.set_caption("Alien Invasion")
    ship = Ship(ai_settings,screen)
    #bg_color = (ai_settings.bg_color)
    #screen.fill(bg_color)
    while True:
            gf.check_events(ship)
            ship.update()
            gf.update_screen(ai_settings,screen,ship)

run_game()

#settings.py
import sys
import pygame
def check_keydown_events(event,ship):
    if event.key == pygame.K_RIGHT:
        ship.moving_right = True
    elif event.key == pygame.K_LEFT:
        ship.moving_left = True
def check_keyup_events(event,ship):
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False
def check_events(ship):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event,ship)
        elif event.type == pygame.KEYUP:
            check_keyup_events(event,ship)
def update_screen(ai_settings,screen,ship):
    screen.fill(ai_settings.bg_color)
    ship.blitme()
    pygame.display.flip()

#game_functions.py
class Settings():
    def __init__(self):
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (230,230,230)
        self.ship_speed_factor = 1.5

#ship.py
import pygame
class Ship():
    def __init__(self,ai_settings,screen):
        self.screen = screen
        self.ai_settings = ai_settings
        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        self.rect.centerx = self.screen_rect.centerx
        self.center = float(self.rect.centerx)
        self.rect.bottom = self.screen_rect.bottom
        self.moving_right = False
        self.moving_left = False
    def update(self):
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center += self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center -= self.ai_settings.ship_speed_factor
        self.rect.centerx = self.center
    def blitme(self):
        self.screen.blit(self.image,self.rect)

这样，一个可以左右移动但不会超出边界的飞船就做好了。