【Python编程：从入门到实践】第十三章：外星人
13-1 星星 ：找一幅星星图像，并在屏幕上显示一系列整齐排列的星星。
start.py
import pygame
from pygame.sprite import Sprite
class Start(Sprite):
"""docstring for Start"""
def __init__(self, screen):
super(Start, self).__init__()
self.screen = screen
self.image = pygame.image.load('images/start.bmp')
self.rect = self.image.get_rect()
#设置位置
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)
import pygame
import sys
from start import Start
from pygame.sprite import Group
def screen():
pygame.init()
screen = pygame.display.set_mode((1200,800))
bg_color = (255,255,255)
pygame.display.set_caption("all start")
start = Group()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
create_start(start,screen)
screen.fill(bg_color)
start.draw(screen)
pygame.display.flip()
def create_start(start,screen):
start1 = Start(screen)
start_width = start1.rect.width
avaliable_x = 1200 - 2*start_width
number_x = int(avaliable_x / (2 * start_width))
start_height = start1.rect.height
avaliable_y = 800 - 2* start_height
number_y = int (avaliable_y / (2 * start_height))
for n_y in range(number_y):
for n_x in range(number_x):
st = Start(screen)
st.x = start_width + 2 * start_width * n_x
st.y = start_height + 2 * start_height * n_y
st.rect.x = st.x
st.rect.y = st.y
start.add(st)
screen()
13-2 更逼真的星星 ：为让星星的分布更逼真，可随机地放置星星。本书前面说过，可像下面这样来生成随机数：
from random import randint
random_number = randint(-10,10）
start.py
同上
screen.py
import pygame
import sys
from start import Start
from pygame.sprite import Group
from random import randint
def screen():
pygame.init()
screen = pygame.display.set_mode((1200,800))
bg_color = (255,255,255)
pygame.display.set_caption("all start")
start = Group()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
create_start(start,screen)
screen.fill(bg_color)
start.draw(screen)
pygame.display.flip()
def create_start(start,screen):
start1 = Start(screen)
start_width = start1.rect.width
avaliable_x = 1200 - 2*start_width
number_x = int(avaliable_x / (2 * start_width))
start_height = start1.rect.height
avaliable_y = 800 - 2* start_height
number_y = int (avaliable_y / (2 * start_height))
for n_y in range(number_y):
for n_x in range(number_x):
st = Start(screen)
st.x = randint(-30,30) + 2 * start_width * n_x
st.y = randint(-30,30) + 2 * start_height * n_y
st.rect.x = st.x
st.rect.y = st.y
start.add(st)
screen()
13-3 雨滴 ：寻找一幅雨滴图像，并创建一系列整齐排列的雨滴。让这些雨滴往下落，直到到达屏幕底端后消失。
rain.py
import pygame
from pygame.sprite import Sprite
from random import randint
class Rain(Sprite):
"""docstring for Start"""
def __init__(self, screen):
super(Rain, self).__init__()
self.screen = screen
self.image = pygame.image.load('images/rain.bmp')
self.rect = self.image.get_rect()
#设置位置
self.rect.x = self.rect.width
self.rect.y = self.rect.height
self.x = float(self.rect.x)
self.y = float(self.rect.y)
self.speed = 1
def blitme(self):
self.screen.blit(self.image,self.rect)
def update(self):
self.y +=self.speed
self.rect.y = self.yimport pygame
import sys
from rain import Rain
from pygame.sprite import Group
from random import randint
def screen():
pygame.init()
screen = pygame.display.set_mode((1200,600))
bg_color = (255,255,255)
pygame.display.set_caption("all Rain")
rains = Group()
create_rain(rains,screen)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
screen.fill(bg_color)
for r in rains:
r.update()
if r.rect.y > 1200:
rains.remove(r)
rains.draw(screen)
pygame.display.flip()
def create_rain(rains,screen):
rain1 = Rain(screen)
rain_width = rain1.rect.width
avaliable_x = 1200 - 2*rain_width
number_x = int(avaliable_x / (2 * rain_width))
rain_height = rain1.rect.height
avaliable_y = 800 - 2* rain_height
number_y = int (avaliable_y / (2 * rain_height))
for n_x in range(number_x):
r = Rain(screen)
r.x = rain_width + 2 * rain_width * n_x
r.rect.x = r.x
rains.add(r)
screen()结果：
13-4 连绵细雨 ：修改为完成练习13-3而编写的代码，使得一行雨滴消失在屏幕底端后，屏幕顶端又出现一行新雨滴，并开始往下落。
rain.py
同上
screen.py
import pygame
import sys
from rain import Rain
from pygame.sprite import Group
from random import randint
def screen():
pygame.init()
screen = pygame.display.set_mode((1200,600))
bg_color = (255,255,255)
pygame.display.set_caption("all Rain")
rains = Group()
create_rain(rains,screen)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
screen.fill(bg_color)
flag = False
for r in rains:
r.update()
if r.rect.y > 1200:
rains.remove(r)
flag = True
if flag:
create_rain(rains,screen)
flag = False
rains.draw(screen)
pygame.display.flip()
def create_rain(rains,screen):
rain1 = Rain(screen)
rain_width = rain1.rect.width
avaliable_x = 1200 - 2*rain_width
number_x = int(avaliable_x / (2 * rain_width))
rain_height = rain1.rect.height
avaliable_y = 800 - 2* rain_height
number_y = int (avaliable_y / (2 * rain_height))
for n_x in range(number_x):
r = Rain(screen)
r.x = rain_width + 2 * rain_width * n_x
r.rect.x = r.x
rains.add(r)
screen()
13-5 抓球：创建一个游戏，在屏幕地段放置一个玩家可左右移动的角色。让一个球出现在屏幕顶端，且水平位置是随机的，并让这个球以固定的速度往下落。如果角色与球发生碰撞（表示将球抓住了），就让球消失。每当角色抓住球或引球抵达屏幕低端而消失后，都创建一个新球。
ball.py
from pygame.sprite import Sprite
from random import randint
import pygame
class Ball(Sprite):
"""docstring for Ball"""
def __init__(self, screen):
super(Ball, self).__init__()
self.screen = screen
self.screen_rect = self.screen.get_rect()
self.image = pygame.image.load('images/ball.bmp')
self.rect = self.image.get_rect()
#设置位置
self.rect.x = randint(0,self.screen_rect.right-self.rect.width)
self.rect.y = 0
self.x = float(self.rect.x)
self.y = float(self.rect.y)
self.speed = 1
def blitme(self):
self.screen.blit(self.image,self.rect)
import pygame
from pygame.sprite import Sprite
class Human(Sprite):
"""docstring for Human"""
def __init__(self, screen):
super(Human, self).__init__()
self.screen = screen
self.image = pygame.image.load('images/human.bmp')
self.rect = self.image.get_rect()
self.screen_rect = screen.get_rect()
self.rect.centerx = self.screen_rect.centerx
self.rect.bottom = self.screen_rect.bottom
self.moving_left = False
self.moving_right =False
def update_human(self):
if self.moving_left and self.rect.x > 0:
self.rect.x -=1
if self.moving_right :
self.rect.x +=1
def bliteme(self):
self.screen.blit(self.image,self.rect)
import pygame
import sys
from ball import Ball
from human import Human
class U_Functions():
"""docstring for U_Functions"""
def __init__(self):
pass
def check_event(self,human):
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
human.moving_left = True
elif event.key == pygame.K_RIGHT:
human.moving_right = True
elif event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
human.moving_left = False
elif event.key == pygame.K_RIGHT:
human.moving_right = False
def create_ball(self,ball,screen):
if len(ball) ==0:
b = Ball(screen)
ball.add(b)
else:
pass
def update_ball(self,ball,screen,human):
for b in ball:
b.rect.y +=b.speed
if b.rect.y > b.screen_rect.bottom:
ball.remove(b)
collisions = pygame.sprite.groupcollide(ball,human,True,False)
def update_screen(self,screen,human,bg_color,ball):
screen.fill(bg_color)
if len(human) == 0:
human.add(Human(screen))
for h in human:
self.check_event(h)
h.update_human()
human.draw(screen)
self.create_ball(ball,screen)
self.update_ball(ball,screen,human)
ball.draw(screen)
pygame.display.flip()
import pygame
import sys
from human import Human
from update_fuction import U_Functions
from ball import Ball
from pygame.sprite import Group
def run():
pygame.init()
screen = pygame.display.set_mode((800,600))
pygame.display.set_caption("catch ball")
bg_color =(255,255,255)
human = Human(screen)
function = U_Functions()
b = Group()
human = Group()
while True:
function.update_screen(screen,human,bg_color,b)
run()
13-6 游戏结束：在为完成练习 13-5 而编写的代码中，跟踪玩家有多少次未将球接着。在未接着求的次数到达三次后，结束游戏。
ball.py 和 human.py 同上
game_status.py
class GameStatus(object):
"""docstring for GameStatus"""
def __init__(self):
self.game_active = True
self.total = 0
self.catched = 0
self.loss = 0
def check_active(self):
if self.loss == 3:
self.game_active = False
import pygame
import sys
from ball import Ball
from human import Human
from time import sleep
class U_Functions():
"""docstring for U_Functions"""
def __init__(self):
pass
def check_event(self,human):
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
human.moving_left = True
elif event.key == pygame.K_RIGHT:
human.moving_right = True
elif event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT:
human.moving_left = False
elif event.key == pygame.K_RIGHT:
human.moving_right = False
def create_ball(self,ball,screen):
if len(ball) ==0:
b = Ball(screen)
ball.add(b)
else:
pass
def update_ball(self,ball,screen,human,game_status):
for b in ball:
b.rect.y +=b.speed
if b.rect.y > b.screen_rect.bottom:
ball.remove(b)
game_status.loss +=1
if pygame.sprite.groupcollide(ball,human,True,False):
sleep(0.5)
def update_screen(self,screen,human,bg_color,ball,game_status):
screen.fill(bg_color)
if len(human) == 0:
human.add(Human(screen))
for h in human:
self.check_event(h)
h.update_human()
human.draw(screen)
self.create_ball(ball,screen)
self.update_ball(ball,screen,human,game_status)
ball.draw(screen)
pygame.display.flip()
import pygame
import sys
from human import Human
from update_fuction import U_Functions
from ball import Ball
from pygame.sprite import Group
from game_status import GameStatus
def run():
pygame.init()
screen = pygame.display.set_mode((800,600))
pygame.display.set_caption("catch ball")
bg_color =(255,255,255)
human = Human(screen)
function = U_Functions()
b = Group()
human = Group()
game_status = GameStatus()
while True:
game_status.check_active()
if game_status.game_active:
function.update_screen(screen,human,bg_color,b,game_status)
else:
sys.exit()
run()