【Pygame 第8课】 火力全开

粒子爆炸鸡

请问老师：我这样为什么不会有子弹发射出去呀？感觉问题出在bullet.move()里面，但是一用bullet.active就没有子弹了

1. import pygame
   
2. from sys import exit
   
3. from alien import Alien
   
4. from random import randint
   
5. from random import random
   
6. 
   
7. class Alien:
   
8.     def restart(self):
   
9.         self.x = randint(50,350)
   
10.         self.y = randint(-200,-50)
    
11.         self.speed = random()+1
    
12.     def __init__(self):
    
13.         self.restart()
    
14.         self.image = pygame.image.load('image/alien.bmp')
    
15.     def move(self):
    
16.         if self.y < 700:
    
17.             self.y += self.speed
    
18.         else:
    
19.             self.restart()
    
20. 
    
21. class Bullet():
    
22.     def __init__(self):
    
23.         self.x = 0
    
24.         self.y = 0
    
25.         self.image = pygame.image.load('image/bullet.bmp')
    
26.         self.active = False
    
27.     def restart(self):
    
28.         self.active = True
    
29.         (mouse_x,mouse_y) = pygame.mouse.get_pos()
    
30.         self.x = mouse_x - self.image.get_width()/2
    
31.         self.y = mouse_y - self.image.get_height()/2
    
32.     def move(self):
    
33.         if self.active == True:
    
34.             self.y -= 5
    
35.         if self.y <0:
    
36.             self.active = False
    
37. 
    
38. pygame.init()
    
39. screen = pygame.display.set_mode((400,700))
    
40. pygame.display.set_caption('打飞机')
    
41. background = pygame.image.load('image/bg.bmp')
    
42. ship = pygame.image.load('image/ship.bmp')
    
43. bullet = Bullet()
    
44. alien = Alien()
    
45. while True:
    
46.     for event in pygame.event.get():
    
47.         if event.type == pygame.QUIT:
    
48.             pygame.quit()
    
49.             exit()
    
50.         if event.type == pygame.MOUSEBUTTONDOWN:
    
51.             background = pygame.image.load('image/bg2.bmp')
    
52.     (x,y) = pygame.mouse.get_pos()
    
53.     x -= (ship.get_width()/2)
    
54.     y -= (ship.get_width()/2)
    
55.     bullet.move()
    
56.     alien.move()
    
57.     screen.blit(background,(0,0))
    
58.     screen.blit(ship,(x,y))
    
59.     screen.blit(bullet.image,(bullet.x,bullet.y))
    
60.     screen.blit(alien.image,(alien.x,alien.y))
    
61.     pygame.display.update()
    

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