ship.py

import pygame

class Ship():
    def __init__(self,ai_settings,screen):
        # 初始化飞船
        self.screen = screen
        self.ai_settings = ai_settings
        # 加载图像
        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        
        # 将每艘新飞船放在屏幕底部中央
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom-40
        self.center = float(self.rect.centerx)
        # 移动标志
        self.moving_right = False
        self.moving_left = False

    def blitme(self):
        # 指定位置绘制飞船
        self.screen.blit(self.image,self.rect)

    def update(self):
        # 根据标志条子飞船位置
      
        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

        # 更新rect
        self.rect.centerx = self.center


    def center_ship(self):
        """"让飞船居中"""
        self.center = self.screen_rect.centerx