python第十二章习题答案

12.1

import pygame

def run_game():
    #初始化创立一个屏幕对象
    pygame.init()
    screen = pygame.display.set_mode((1600,1200))
    pygame.display.set_caption('blue sky')
    bg_color = (0,0,255)
    #背景色设置成蓝色

    while True:
        screen.fill(bg_color)
        pygame.display.flip()
        #开始循环，不断刷新背景色，让最近绘制的屏幕可见
run_game()

12.2

先创立类
character.py

import pygame
    
        class Character():
            def __init__(self,screen):
                self.screen = screen
                #初始化人物并设置初始位置
        
                self.image = pygame.image.load('caocao/caocao.bmp')
                self.rect = self.image.get_rect()
                self.screen_rect = screen.get_rect()
                #加载人物图像获取其外接矩形
        
                self.rect.centerx = self.screen_rect.centerx
                self.rect.centery = self.screen_rect.centery
                #将人物放到屏幕中间
        
            def blitme(self):
                self.screen.blit(self.image,self.rect)
                #在指定位置绘制人物

再运行程序

import pygame
from character import Character

def run_game():
    #初始话创立一个屏幕对象
    pygame.init()
    screen = pygame.display.set_mode((1600,1200))
    pygame.display.set_caption('cao cao')
    bg_color = (255,255,255)
    #背景色为白色

    character=Character(screen)
    #创立角色

    while True:
        screen.fill(bg_color)
        character.blitme()
        #角色显示于屏幕中

        pygame.display.flip()
run_game(）

12.3

创立设置类型
setting.py

class Setting():
    #这里放有《火箭》所有的类
    def __init__(self):
        #屏幕设置
        #初始化游戏设置
        self.screen_width = 1600
        self.screen_height = 1200
        self.bg_color = (255,255,255)

        self.huojian_speed_factor = 1.5

创立火箭的类型
huojian.py

import pygame

class Huojian():
    def __init__(self,ai_settings,screen):
        self.screen = screen
        self.ai_settings = ai_settings
        #初始化火箭图像加载位置

        self.image = pygame.image.load('huojian/huojian.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        # 加载火箭图像并且获取其外接矩形

        self.rect.centerx = self.screen_rect.centerx
        self.rect.centery = self.screen_rect.centery
        #将火箭放到屏幕中间

        self.centerx = float(self.rect.centerx)
        self.centery = float(self.rect.centery)
        # 在火箭的属性center中存储小数值

        self.moving_right = False
        self.moving_left = False
        self.moving_top = False
        self.moving_bottom = False

    def update(self):
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.centerx += self.ai_settings.huojian_speed_factor

        if self.moving_left and self.rect.left > 0:
            self.centerx -= self.ai_settings.huojian_speed_factor

        if self.moving_top and self.rect.bottom > self.screen_rect.top and self.rect.bottom < 1200:
            self.centery += self.ai_settings.huojian_speed_factor

        if self.moving_bottom and self.rect.top > 0:
            self.centery -= self.ai_settings.huojian_speed_factor
            #根据标志调整火箭位置
        self.rect.centerx = self.centerx
        self.rect.centery = self.centery
        #根据self.center更新rect对象

    def blitme(self):
        self.screen.blit(self.image,self.rect)
        #在指定位置绘制火箭

再写好火箭的左右上下移动功能。
game_function.py

import sys

import pygame

def check_keydown_events(event,huojian):
    if event.key == pygame.K_RIGHT:
        huojian.moving_right = True
    elif event.key == pygame.K_LEFT:
        huojian.moving_left = True
    elif event.key == pygame.K_DOWN:
        huojian.moving_top = True
    elif event.key == pygame.K_UP:
        huojian.moving_bottom = True
#按键触发移动事件

def check_keyup_events(event,huojian):
    if event.key == pygame.K_RIGHT:
        huojian.moving_right = False
    elif event.key == pygame.K_LEFT:
        huojian.moving_left = False
    elif event.key == pygame.K_DOWN:
        huojian.moving_top = False
    elif event.key == pygame.K_UP:
        huojian.moving_bottom = False
#按键松开触发事件

def check_events(huojian):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event,huojian)

        elif event.type == pygame.KEYUP:
            check_keyup_events(event,huojian)
#总领触发事件

def update_screen(ai_settings,screen,huojian):
    screen.fill(ai_settings.bg_color)
    huojian.blitme()

    pygame.display.flip()
#使得最近的绘制体现在屏幕上

最后重构好主程序，并且运行这个主程序。
12.3.py

import pygame

from huojian import Huojian

from setting import Setting

import game_function as gf

def run_game():
    #初始化游戏并创立一个屏幕对象
    pygame.init()
    ai_settings = Setting()
    screen = pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
    pygame.display.set_caption("Huojian fei")

    huojian = Huojian(ai_settings,screen)
    #创立火箭

    while True:
        # 监视键盘和鼠标事件,有方向按键就往这个方向移动并且实施
        gf.check_events(huojian)
        huojian.update()

        # 每次循环时都会重绘屏幕
        gf.update_screen(ai_settings, screen, huojian)


run_game()