ship.py

import pygame
from pygame.sprite import Sprite

class Ship(Sprite):
    def __init__(self,screen,ai_settings):
        super().__init__()
        self.ai_settings=ai_settings
        self.screen=screen
        self.image=pygame.image.load('images/ship.bmp')
        self.rect=self.image.get_rect()
        self.screen_rect=screen.get_rect()


        self.rect.centerx=self.screen_rect.centerx
        self.rect.bottom=self.screen_rect.bottom

        self.center = float(self.rect.centerx)
        #飞船移动标志
        self.moving_right=False
        self.moving_left=False

    def blitme(self):
        self.screen.blit(self.image,self.rect)

    def update(self):
        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

        self.rect.centerx=self.center


    def center_ship(self):
        self.center=self.screen_rect.centerx