python编程从入门到实践第13章 - 外星人

13-1

import pygame
import sys
from pygame.sprite import Group
from pygame.sprite import Sprite
from random import randint
 
class Settings():
    def __init__(self):
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (255,255,255)
 
 
class Huaji(Sprite):
    def __init__(self, settings, screen):
        super(Huaji,self).__init__()
        self.settings = settings
        self.screen = screen
        self.image = pygame.image.load('huaji.bmp')
        self.rect = self.image.get_rect()
        self.rect.x = self.rect.width
        self.rect.y = self.rect.height
        self.x = float(self.rect.x)
 
    def blitme(self):
        self.screen.blit(self.image, self.rect)
 
 
def get_number_huajis_x(settings, huaji_width):
    available_space_x =settings.screen_width -  huaji_width
    number_huajis_x = int(available_space_x / (2 * huaji_width))
    return number_huajis_x
 
 
def get_number_rows(settings, huaji_height):
    available_space_y = (settings.screen_height - huaji_height )
    number_rows = int(available_space_y / (2 * huaji_height))
    return number_rows
 
 
def create_huaji(settings, screen, huajis, huaji_number, row_number):
    huaji = Huaji(settings, screen)
    huaji_width = huaji.rect.width
    huaji.x = randint(0,1200) 
    huaji.rect.x = huaji.x
    huaji.rect.y = randint(0,800) 
    huajis.add(huaji)
 
def create_huaji_fleet(settings, screen, huajis):
    huaji = Huaji(settings, screen)
    number_huajis_x = get_number_huajis_x(settings, huaji.rect.width)
    number_rows = get_number_rows(settings, huaji.rect.height)
 
    for row_number in range(number_rows):
        for huaji_number in range(number_huajis_x):
            create_huaji(settings, screen, huajis, huaji_number, row_number)
 

import pygame
import sys
from pygame.sprite import Group
from pygame.sprite import Sprite
from xingxing import Huaji
from xingxing import Settings
import xingxing as xx
def run_huaji():
    pygame.init()
    settings = Settings()
    screen = pygame.display.set_mode((settings.screen_width, settings.screen_height))
    pygame.display.set_caption('滑稽滑稽')
    huajis = Group()
    xx.create_huaji_fleet(settings, screen, huajis)
    huaji = Huaji(settings,screen)
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
 
        screen.fill(settings.bg_color)
        huajis.draw(screen)
        pygame.display.flip()
 
 
run_huaji()

输出：

 

 13-2 

def create_huaji(settings, screen, huajis, huaji_number, row_number):
    huaji = Huaji(settings, screen)
    huaji_width = huaji.rect.width
    huaji.x = randint(0,1200) 
    huaji.rect.x = huaji.x
    huaji.rect.y = randint(0,800) 
    huajis.add(huaji)

  就是很简单的把图片xy坐标用randint变成随机的，不过我的结果有重叠的，不知道有没有不重叠的办法

输出：

 

 13-3  咋回事，明明带了行循环，为啥只显示一行  看着没毛病。。

import pygame
import sys
from pygame.sprite import Sprite
from pygame.sprite import Group


class Settings():
    def __init__(self):
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color  = (255,255,255)
        
        self.qianbenying_speed_factor = 1
class Qianbenying(Sprite):
    def __init__(self,settings,screen):
        super(Qianbenying,self).__init__()
        self.screen = screen
        self.settings =settings
        self.image = pygame.image.load('qianbenying.bmp')
        self.rect = self.image.get_rect()
        self.rect.y = self.rect.height
        self.rect.x = self.rect.width
        self.qianbenying_speed_factor = 1
        self.x = float(self.rect.x)
        self.y = float(self.rect.y)
    def update(self):
        '''向下移动子弹'''
        self.y += self.qianbenying_speed_factor 
        self.rect.y = self.y
        
    def blitme(self):
        self.screen.blit(self.image,self.rect)


def get_number_qianbenyings_x(settings, qianbenying_width):
    available_space_x =settings.screen_width -  qianbenying_width * 2
    number_qianbenyings_x = int(available_space_x / (2 * qianbenying_width))
    return number_qianbenyings_x
    
def get_number_rows(settings, qianbenying_height):
    available_space_y = (settings.screen_height - qianbenying_height )
    number_rows = int(available_space_y / (2 * qianbenying_height))
    return number_rows
    
def create_qianbenying(settings, screen, qianbenyings, 
                                qianbenying_number, row_number):
    qianbenying = Qianbenying(settings, screen)
    qianbenying_width = qianbenying.rect.width
    qianbenying.x = (qianbenying_width + 2 * qianbenying_width * 
                                                qianbenying_number)
    qianbenying.rect.x = qianbenying.x
    qianbenying.rect.y = qianbenying.rect.height + (2  *qianbenying.rect.height * row_number)
    qianbenyings.add(qianbenying)
    
def create_qianbenying_fleet(settings, screen, qianbenyings):
    qianbenying = Qianbenying(settings, screen)
    number_qianbenyings_x = get_number_qianbenyings_x(settings,qianbenying.rect.width)
    number_rows = get_number_rows(settings, qianbenying.rect.height)
 
    for row_number in range(number_rows):
        for qianbenying_number in range(number_qianbenyings_x):
            create_qianbenying(settings, screen, qianbenyings, qianbenying_number, row_number)

def update_qianbenyings(settings,qianbenyings):
    qianbenyings.update()
    for qianbenying in qianbenyings.copy():
        if qianbenying.rect.top >= settings.screen_height:
            qianbenyings.remove(qianbenying)
def runq():
    pygame.init()
    settings = Settings()
    screen = pygame.display.set_mode((settings.screen_width,settings.screen_height))
    #游戏窗口标题
    pygame.display.set_caption("千本樱景严")
    #创建一艘飞船,一个子弹编组和一个外星人编组
    
    qianbenyings = Group()
    #创建外星人群
    create_qianbenying_fleet(settings,screen,qianbenyings)
    #设置背景色
    
    #开始游戏的主循环
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
        screen.fill(settings.bg_color)
        qianbenyings.draw(screen)
        update_qianbenyings(settings,qianbenyings)
        pygame.display.flip()
runq()

13-4 update_qianbengyings里加一句这个，更新下参数就行了， 然后发现删除掉update有关的就是移动的函数， 运行不动的程序时是多行的，可是运行起来就是单行的，这未免有点奇怪了，按理说移动的函数规定的是单个图片的属性，不会影响行之类的啊

if qianbenying.rect.top >= settings.screen_height:
        create_qianbenying_fleet(settings,screen,qianbenyings)

 13-5