scoreboard.py

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, alien_settings, screen, stats):
		"""初始化显示得分涉及的属性"""
		self.screen = screen
		self.screen_rect = self.screen.get_rect()
		self.alien_settings = alien_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)

		self.prep_images()

	def prep_score(self):
		rounded_score = round(self.stats.score, -1)
		score_str = "{:,}".format(rounded_score)
		self.score_image = self.font.render(score_str, True, self.text_color, self.alien_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 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)
		self.ships.draw(self.screen)

	def prep_high_score(self):
		"""将最高得分转换为渲染的图像"""
		high_score = 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.alien_settings.bg_color)

		#将最高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("LV: " + str(self.stats.level), True, self.text_color, self.alien_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.alien_settings, self.screen)
			ship.rect.x = 10 + ship_number * ship.rect.width
			ship.rect.y = 10
			self.ships.add(ship)

	def prep_images(self):
		#准备初始得分图像
		self.prep_score()
		#准备最高得分的图像
		self.prep_high_score()
		#准备等级图像
		self.prep_level()
		#准备飞船剩余图像
		self.prep_ships()