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man.py

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+import pygame
+from pygame.sprite import Sprite
+
+class Man(Sprite):
+
+    def __init__(self, ai_settings, screen):
+        """初始化人，并设置其起始位置"""
+        super(Man, self).__init__()
+        self.screen = screen
+        self.ai_settings = ai_settings
+
+        # 加载人的图像，并获取其rect
+        self.image = pygame.image.load('images/man.png')
+        self.rect = self.image.get_rect()
+        self.screen_rect = screen.get_rect()
+
+        # 在屏幕底部中央启动
+        self.rect.centerx = self.screen_rect.centerx
+        self.rect.bottom = self.screen_rect.bottom
+        
+        # 存储人中心的十进制值
+        self.center = float(self.rect.centerx)
+        
+        # 运动
+        self.moving_right = False
+        self.moving_left = False
+        
+    def center_man(self):
+        """在窗口上使人居中"""
+        self.center = self.screen_rect.centerx
+        
+    def update(self):
+        """根据移动标志更新人位置"""
+        # 更新人的中心值，而不是rect
+        if self.moving_right and self.rect.right < self.screen_rect.right:
+            self.center += self.ai_settings.man_speed_factor
+        if self.moving_left and self.rect.left > 0:
+            self.center -= self.ai_settings.man_speed_factor
+            
+        # 从self.center更新rect对象
+        self.rect.centerx = self.center
+
+    def blitme(self):
+        """在当前位置绘制人"""
+        self.screen.blit(self.image, self.rect)