中途岛海战向下滚动背景类

中途岛海是本人编写的一个飞机大战游戏。这是向下滚动的背景类，以供给有需要的朋友。

python midway scrollbackground向下滚动背景

"""
   向下滚动的背景
"""
__author__ = '李兴球'
__date__ = '2019/9/16'

import pygame
from pygame.locals import *

class ScrollBackground:
    """滚动的背景"""

    def __init__(self,image,screen):
        """image:背景图,screen:屏幕"""
        self.screen = screen
        self.sh  = screen.get_height()
        self.image0 = image
        self.image1 = image.copy()
        print(id(self.image0),id(self.image1))
        self.rect0 = self.image0.get_rect(topleft=(0,0))
        self.rect1 = self.image1.get_rect(bottomleft=(0,0))        
        self.dy = 10
        
    def update(self):
        """更新坐标"""
        self.rect0.move_ip(0,self.dy)
        if self.rect0.top >= self.sh : self.rect0.bottom = 0
        self.rect1.move_ip(0,self.dy)
        if self.rect1.top >= self.sh : self.rect1.bottom = 0

    def draw(self):
        self.screen.blit(self.image0,self.rect0)
        self.screen.blit(self.image1,self.rect1)
main():
    """主要函数"""
    bg = 'images/海洋.png'    
    width,height = size = 960,720
    
    screen = pygame.display.set_mode(size)
    pygame.display.set_caption("中途岛海战向下滚动背景测试程序by李兴球")
    bg_image = pygame.image.load(bg)
    
    scrbg = ScrollBackground(bg_image,screen)
    clock = pygame.time.Clock()
    
    running = True
    while running:
        for event in pygame.event.get():
            if event.type == QUIT:running = False

        scrbg.update()

        screen.fill((0,120,172))
        scrbg.draw()
        pygame.display.update()
        clock.tick(60)
        
    pygame.quit()
    
if __name__ == "__main__":
    
    main()   

 
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