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import pygame
from pygame . sprite import Sprite
class Bullet ( Sprite ) :
""" 用于管理从人那里发射的子弹的类 """
def __init__ ( self , ai_settings , screen , man ) :
""" 在船的当前位置创建一个项目符号对象 """
super ( Bullet , self ) . __init__ ( )
self . screen = screen
# 在（ ） ，
self . rect = pygame . Rect ( 0 , 0 , ai_settings . bullet_width ,
ai_settings . bullet_height )
self . rect . centerx = man . rect . centerx
self . rect . top = man . rect . top
# 存储项目符号位置的十进制值
self . y = float ( self . rect . y )
self . color = ai_settings . bullet_color
self . speed_factor = ai_settings . bullet_speed_factor
def update ( self ) :
""" 把子弹移到屏幕上. """
# 更新子弹（项目符号）的小数位置
self . y - = self . speed_factor
# 更新rect位置
self . rect . y = self . y
def draw_bullet ( self ) :
""" 把子弹画到屏幕上. """
pygame . draw . rect ( self . screen , self . color , self . rect )
