添加 'scoreboard'

scoreboard

@@ -0,0 +1,74 @@
+import pygame.font
+from pygame.sprite import Group
+
+from ship import Ship
+
+
+class Scoreboard():
+    """显示得分信息的类"""
+
+    def __init__(self, ai_settings, screen, stats):
+        """初始化显示得分涉及的属性"""
+        self.screen = screen
+        self.screen_rect = screen.get_rect()
+        self.ai_settings = ai_settings
+        self.stats = stats
+
+        # 显示得分信息时使用的字体设置
+        self.text_color = (30, 30, 30)
+        self.font = pygame.font.SysFont(None, 48)
+
+        # 准备初始得分图像
+        self.prep_score()
+        self.prep_high_score()
+        self.prep_level()
+        self.prep_ships()
+
+    def prep_score(self):
+        """将得分转换为渲染的图像"""
+        rounded_score = int(round(self.stats.score, -1))
+        score_str = "{:,}".format(rounded_score)
+        self.score_image = self.font.render(score_str, True, self.text_color, self.ai_settings.bg_color)
+
+        # 将得分放在屏幕右上角
+        self.score_rect = self.score_image.get_rect()
+        self.score_rect.right = self.screen_rect.right - 20
+        self.score_rect.top = 20
+
+    def prep_high_score(self):
+        """将最高得分转换为渲染的图像"""
+        high_score = int(round(self.stats.high_score, -1))
+        high_score_str = "{:,}".format(high_score)
+        self.high_score_image = self.font.render(high_score_str, True, self.text_color, self.ai_settings.bg_color)
+
+        # 将得分放在屏幕顶部中央
+        self.high_score_rect = self.high_score_image.get_rect()
+        self.high_score_rect.centerx = self.screen_rect.centerx
+        self.high_score_rect.top = self.score_rect.top
+
+    def prep_level(self):
+        """将等级转换为渲染的图像"""
+        self.level_image = self.font.render(str(self.stats.level), True, self.text_color, self.ai_settings.bg_color)
+
+        # 将等级放在得分下方
+        self.level_rect = self.level_image.get_rect()
+        self.level_rect.right = self.score_rect.right
+        self.level_rect.top = self.score_rect.bottom + 10
+
+    def prep_ships(self):
+        """显示还余下多少艘飞船"""
+        self.ships = Group()
+        for ship_number in range(self.stats.ships_left):
+            ship = Ship(self.ai_settings, self.screen)
+            ship.rect.x = 10 + ship_number * ship.rect.width
+            ship.rect.y = 10
+            self.ships.add(ship)
+
+    def show_score(self):
+        """在屏幕上显示得分"""
+        self.screen.blit(self.score_image, self.score_rect)
+        self.screen.blit(self.high_score_image, self.high_score_rect)
+        self.screen.blit(self.level_image, self.level_rect)
+
+        # 绘制飞船
+        self.ships.draw(self.screen)