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，直到到达屏幕后消失。
先说今天的问题：
1.在更改函数形参时，调用的时候也要修改，否则会出现AttributeError
值得注意的是：每当添加进新的代码，要检查函数传递的参数是否对应一致，函数本身与调用它的时候都要检查
2.愚蠢的错误：把创建整齐雨滴的函数写到循环体中去了，结果一直出现重叠，达不到预期效果，搞了半天眼睛快瞎了才发现，唉！
主程序 display
import pygame
from settings import Settings
from rain import Rain
import func as f
from pygame.sprite import Group#####
def display():
"""主函数----显示雨滴效果"""
pygame.init()
settings = Settings()
screen = pygame.display.set_mode((settings.screen_width, settings.screen_height))
pygame.display.set_caption('Raining')
rains = Group()####
f.create_rains(settings, screen, rains)#####
while True:
f.check_events()
screen.fill(settings.bg_color)
f.change_direction(settings, rains)
rains.draw(screen)
pygame.display.flip()
display()
函数模块func
import pygame
import sys
from rain import Rain
def check_events():
"""按键检查"""
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
def get_col_numbers(settings, rain):#对于每一行来说，变化的是x坐标，列在变化
"""一行可以存放的雨滴数"""
col_numbers = int(settings.screen_width / (2 * rain.rect.width))
return col_numbers
def get_row_numbers(settings, rain):
"""可存放雨滴的行数"""
row_numbers = int(settings.screen_height / (1 * rain.rect.height))
return row_numbers
def create_rain(settings, screen, rains, col_number, row_number):
rain = Rain(settings, screen)
rain_width = rain.rect.width
rain.x = rain_width + 2 * rain_width * col_number
rain.rect.x = rain.x#rect存放整数
rain.rect.y = rain.rect.y + 2 * rain.rect.height * row_number
rains.add(rain)
def create_rains(settings, screen, rains):
rain = Rain(settings, screen)#这句是要写的，不写的话get_col_numbers()中的rain将出现NameError
col_numbers = get_col_numbers(settings, rain)
row_numbers = get_row_numbers(settings, rain)
for row_number in range(row_numbers):
for col_number in range(col_numbers):
create_rain(settings, screen, rains, col_number, row_number)
def change_direction(settings, rains):
for rain in rains.sprites():
rain.rect.y += settings.drop_speed
rain类：
import pygame
from pygame.sprite import Sprite
class Rain(Sprite):
"""雨滴"""
def __init__(self, settings, screen):
super().__init__()
self.screen = screen
self.settings = settings
self.image = pygame.image.load('rain.bmp')
self.rect = self.image.get_rect()
self.y = float(self.rect.y)
def blitme(self):
self.screen.blit(self.image, self.rect)
def check_edges(self):
"""如果雨滴位于屏幕边缘就返回True"""
if self.rect.top >= self.screen.rect.bottom:
return True
settings类：
class Settings():
"""设置所有设置的类"""
def __init__(self):
self.screen_width = 1200
self.screen_height = 600
self.bg_color = (255, 255, 255)
self.drop_speed = 1
效果图：
初始：
下落：
