这是本人编写的中途岛海战的淡入淡出的云彩类模块。供给有需要的人士。下面是部分代码预览：

python midway war fade in fade out cloud

"""
   中途岛海战淡入淡出的云彩类程序
"""

__author__ = "李兴球"
__date__ = "2019/9/12"

import pygame
from pygame.locals import *
from random import randint

class Cloud(pygame.sprite.Sprite):
    """从上到下移动淡入淡出的云彩类"""
    def __init__(self,images,screen):
        """
           images：越来越透明的每像素图形,screen：屏幕
        """
        pygame.sprite.Sprite.__init__(self)
        self.images = images
        self.amounts = len(images)  # 造型数量
        self.sw = screen.get_width()
        self.sh = screen.get_height()
        self.index = 0
        self.image = images[0]      # 最透明的图
        self.rect = self.image.get_rect()
        self.rect.centerx = randint(0,self.sw)
        self.rect.bottom = 0

    def update(self):
        """更新坐标与造型"""


def load_cloud_images(image,n):
    """加载云图片
       image:图像文件,n:数量
    """
    image = pygame.image.load(image).convert_alpha() 
    images = [image.copy() for _ in range(n)]
    
    # alphas是存储每张图片的透明通道的列表
    alphas = [pygame.surfarray.pixels_alpha(image) for image in images]    
    .................................
    
def main():

    width,height = 960,720
    
    screen = pygame.display.set_mode((width,height),0,32)

    images = load_cloud_images('images/Cloud2.png')
    cloud = Cloud(images,screen)
    cloud_group = pygame.sprite.Group()

    pygame.time.set_timer(USEREVENT,1000) # 1秒产生一片云朵
    clock = pygame.time.Clock()
    running = True
    while running:
        for event in pygame.event.get():
            if event.type == QUIT:running = False
            if event.type == USEREVENT:
                cloud_group.add(Cloud(images,screen))
                
        cloud_group.update()
        
        screen.fill((90,120,0))
        cloud_group.draw(screen)
        
        pygame.display.update()
        clock.tick(60)
    pygame.quit()

if __name__== "__main__":

    main()  

 
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