From d0d7a50df4a07a5ac4662c687378e1b625d1abba Mon Sep 17 00:00:00 2001
From: 206530410 <2752975388@qq.com>
Date: Tue, 22 Jun 2021 12:06:26 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20'ship'?=
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---
 ship | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 ship

diff --git a/ship b/ship
new file mode 100644
index 0000000..a3b8af1
--- /dev/null
+++ b/ship
@@ -0,0 +1,47 @@
+import pygame
+from pygame.sprite import Sprite                #导入pygame模块下sprite子模块中的Sprite类
+
+
+class Ship(Sprite):
+
+    def __init__(self, ai_settings, screen):
+        """初始化飞船并设置其初始位置"""
+        super(Ship, self).__init__()                #兼容python2.7，Ship类继承Sprite类属性
+
+        self.screen = screen
+        self.ai_settings = ai_settings
+
+        # 加载飞船图形并获取其外接矩形
+        self.image = pygame.image.load('images/ship.bmp')               #加载图片，创建图片对象
+        self.rect = self.image.get_rect()               #调用get_rect()方法，获取image的属性rect
+        self.screen_rect = screen.get_rect()                #调用get_rect()方法，将表示屏幕的矩形存储在self.screen_rect中
+
+        # 将每艘新飞船放在屏幕底部中央
+        self.rect.centerx = self.screen_rect.centerx                #让飞船矩形centerx属性（中央x坐标）等于屏幕矩形centerx属性，x方向上居中
+        self.rect.bottom = self.screen_rect.bottom              #让飞船矩形bottom属性等于屏幕矩形bottom属性
+
+        # 在飞船的属性center中存储小数值
+        self.center = float(self.rect.centerx)
+
+        # 移动标志
+        self.moving_right = False
+        self.moving_left = False
+
+    def update(self):
+        """根据移动标志调整飞船的位置"""
+        # 更新飞船的center值，而不是rect
+        if self.moving_right and self.rect.right < self.screen_rect.right:              #当向右移动且飞船矩形right属性小于屏幕矩形right属性时
+            self.center += self.ai_settings.ship_speed_factor
+        if self.moving_left and self.rect.left > 0:             #当向左移动且飞船矩形left属性大于0时
+            self.center -= self.ai_settings.ship_speed_factor
+
+        # 根据self.center更新rect对象
+        self.rect.centerx = self.center                 #如果是self.rect.centery = self.center，则飞船会上下移动，而不是左右移动
+
+    def blitme(self):
+        """在指定位置绘制飞船"""
+        self.screen.blit(self.image, self.rect)             #调用blit()方法将图片对象添加到窗口对象中
+
+    def center_ship(self):
+        """让飞船在屏幕上居中"""
+        self.center = self.screen_rect.centerx              #让飞船矩形center属性等于屏幕矩形centerx属性