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alien.py
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alien.py
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# -*- coding: gb2312 -*-
import pygame
from pygame.sprite import Sprite
class Alien(Sprite):
"""表示单个外星人的类"""
def __init__(self,ai_settings,screen):
"""初始化外星人,并且设置其初始位置"""
super(Alien,self).__init__()
self.screen = screen
self.ai_settings = ai_settings
#加载外星人图像,并设置其rect属性
self.image = pygame.image.load("image/2.jpg")
self.rect = self.image.get_rect()
#每个外星人最初都在屏幕左上角附近
self.rect.x = self.rect.width
self.rect.y = self.rect.height
#存储外星人的准确位置
self.x = float(self.rect.x)
def blitme(self):
#在指定位置绘制外星人
self.screen.blit(self.image,self.rect)
def check_edges(self):
"""如果外星人处于屏幕边缘就返回true"""
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):
"""向右移动外星人"""
self.x += (self.ai_settings.alien_speed_factor *
self.ai_settings.fleet_direction)
self.rect.x = self.x