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。