ship.py

# -*- coding: utf-8 -*-
"""
Created on Sat Sep 22 12:50:36 2018

@author: cz
"""
import pygame

class Ship():
    def __init__(self,ai_settings,screen):
        self.screen = screen
        self.ai_settings = ai_settings
    
        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        #加载图像获取外接矩形
    
        #将飞船放于屏幕底部中央
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom
        
        self.center = float(self.rect.centerx)
        
        self.moving_right = False
        self.moving_left = False
    
    def update(self):
        #根据移动标志调整飞船位置
        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
        
        self.rect.centerx = self.center
    
    def blitme(self):
        '''指定位置绘制飞船'''
        self.screen.blit(self.image,self.rect)
        
    def center_ship(self):
        '''飞船居中'''
        self.center = self.screen_rect.centerx