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import pygame
from pygame . sprite import Sprite
class Bazi ( Sprite ) :
""" 创建一个代表靶子的类. """
def __init__ ( self , ai_settings , screen ) :
""" 初始化靶子，并设置其起始位置 """
super ( Bazi , self ) . __init__ ( )
self . screen = screen
self . ai_settings = ai_settings
# 加载外来图像，
self . image = pygame . image . load ( ' images/bazi.png ' )
self . rect = self . image . get_rect ( )
# 在屏幕左上角启动每个新靶子
self . rect . x = self . rect . width
self . rect . y = self . rect . height
# 存储靶子的准确位置
self . x = float ( self . rect . x )
def check_edges ( self ) :
""" 如果靶子在屏幕边缘， """
screen_rect = self . screen . get_rect ( )
if self . rect . right > = screen_rect . right :
return True
elif self . rect . left < = 0 :
return True
def update ( self ) :
""" 靶子的移动（向左或者向右） """
self . x + = ( self . ai_settings . bazi_speed_factor *
self . ai_settings . fleet_direction )
self . rect . x = self . x
def blitme ( self ) :
""" 在当前位置绘制靶子 """
self . screen . blit ( self . image , self . rect )
