Python外星人入侵完整代码和注释(八)

八、计分，创建一个scoreboard.py的文件

1、显示分数，在屏幕上显示最高分，等级和剩余的飞船数，

在正上方显示最高分，右上方显示分数

2、创建记分牌，用于计算得到的分数

3、显示等级。在外星人消灭后，提高等级

代码如下

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)

        #准备初始得分图像包含最高得分
        self.prep_score()
        self.prep_high_score()
        self.prep_level()
        self.prep_ships()
    def prep_score(self):
        #将得分转化为一幅渲染的图片
        #round的第二个实参是将stats.score值整到10的整数倍
        rounded_score = int(round(self.stats.score,-1))
        #一个字符串格式设置指令，在数值中插入逗号
        score_str = "{:,}".format(rounded_score)
        #将字符串传递给创建图像的render()
        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
        #上边缘与屏幕相距20像素
        self.score_rect.top = 20

    def prep_high_score(self):
        #将最高得分转化为渲染的图像
        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(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):
        #显示还剩余多少艘飞船
        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):
        #在屏幕上显示飞船和得分
        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)

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