一、最简单的切换功能

（一）源码

import sys, pygame
import os
import random

pygame.init()  # 初始化pygame类
screen = pygame.display.set_mode((600, 600))  # 设置窗口大小
pygame.display.set_caption('美丽的屏保')  # 设置窗口标题
tick = pygame.time.Clock()
fps = 10  # 设置刷新率，数字越大刷新率越高
fcclock = pygame.time.Clock()
bglist = []
flag = 0
runimage = None
nextimage = None

def init_image():
    path = './image/'
    files = []
    dirs = os.listdir(path)
    for diretion in dirs:
        files.append(path + diretion)

    for file in files:
        picture = pygame.transform.scale(pygame.image.load(file), (600, 600))
        dSurface = picture
        # dSurface = pygame.image.load(file).convert()
        bglist.append(dSurface)

def reset():
    global flag,runimage,nextimage
    flag = 0
    if nextimage is None:
        nextimage = random.choice(bglist)
    if runimage is None:
        runimage = random.choice(bglist)
    else:
        runimage = nextimage
        nextimage = random.choice(bglist)

def run():
    global flag,runimage
    reset()
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT or event.type == pygame.K_F1:
                pygame.quit()
                sys.exit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == pygame.K_SPACE:
                    reset()
        if event.type == pygame.MOUSEBUTTONDOWN:
            reset()
        screen.fill((255, 255, 255))  # 设置背景为白色
        screen.blit(nextimage, (0, 0))
        screen.blit(runimage, (0, 0))
        fcclock.tick(fps)
        pygame.display.flip()  # 刷新窗口
        # time.sleep(10)

if __name__ == '__main__':
    init_image()
    run()

（二）效果

（三）解析

实际就是使用了runimage和nextimage保存两个图片，然后先黏贴nextimage，再黏贴runimage，让runimage显示在最前端。
并通过监听鼠标和键盘操作，每点击一次，切换一次页面。
并调用reset函数

def reset():
    global flag,runimage,nextimage
    flag = 0
    if nextimage is None:
        nextimage = random.choice(bglist)
    if runimage is None:
        runimage = random.choice(bglist)
    else:
        runimage = nextimage
        nextimage = random.choice(bglist)

二、实现动态切屏功能

 （一）向左切换

import sys, pygame
import os
import random

pygame.init()  # 初始化pygame类
WIDTH = 600
HEIGHT = 600
screen = pygame.display.set_mode((WIDTH, HEIGHT))  # 设置窗口大小
pygame.display.set_caption('美丽的屏保')  # 设置窗口标题
tick = pygame.time.Clock()
fps = 60  # 设置刷新率，数字越大刷新率越高
fcclock = pygame.time.Clock()
bglist = []
flag = 0
runimage = None
nextimage = None
flag = False   # FALSE没有切屏 TRUE 切屏
flag2 = False
i = 0
j = 0
step = 10

def init_image():
    path = './image/'
    files = []
    dirs = os.listdir(path)
    for diretion in dirs:
        files.append(path + diretion)

    for file in files:
        picture = pygame.transform.scale(pygame.image.load(file), (WIDTH, HEIGHT))
        dSurface = picture
        # dSurface = pygame.image.load(file).convert()
        bglist.append(dSurface)

def reset():
    global flag,runimage,nextimage,flag2,i,j
    flag = False  # FALSE没有切屏 TRUE 切屏
    flag2 = False
    i = 0
    j = 0
    if nextimage is None:
        nextimage = random.choice(bglist)
    if runimage is None:
        runimage = random.choice(bglist)
    else:
        runimage = nextimage
        nextimage = random.choice(bglist)

def run():
    global flag,runimage,flag2,nextimage,i,j
    reset()
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT or event.type == pygame.K_F1:
                pygame.quit()
                sys.exit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == pygame.K_SPACE:
                    if flag is False:# FALSE没有切屏 TRUE 切屏
                        flag = True
                        flag2 = False
            # if event.type == pygame.MOUSEBUTTONDOWN:
            #     reset()
        screen.fill((255, 255, 255))  # 设置背景为白色
        if flag:
            screen.blit(nextimage, (0, 0))
            screen.blit(runimage, (i, j))
            i -= step
            if i <= -WIDTH:
                flag2 = True
        else:
            screen.blit(nextimage, (0, 0))
            screen.blit(runimage, (0, 0))
        if flag2:
            reset()
        fcclock.tick(fps)
        pygame.display.flip()  # 刷新窗口
        # time.sleep(10)

if __name__ == '__main__':
    init_image()
    run()

（二）向左切换效果

三、随机效果实现

实现上下左右效果

import sys, pygame
import os
import random

pygame.init()  # 初始化pygame类
WIDTH = 600
HEIGHT = 600
screen = pygame.display.set_mode((WIDTH, HEIGHT))  # 设置窗口大小
pygame.display.set_caption('美丽的屏保')  # 设置窗口标题
tick = pygame.time.Clock()
fps = 60  # 设置刷新率，数字越大刷新率越高
fcclock = pygame.time.Clock()
bglist = []
flag = 0
runimage = None
nextimage = None
flag = False   # FALSE没有切屏 TRUE 切屏
flag2 = False
i = 0
j = 0
step = 10
choose = 0

def init_image():
    path = './image/'
    files = []
    dirs = os.listdir(path)
    for diretion in dirs:
        files.append(path + diretion)

    for file in files:
        picture = pygame.transform.scale(pygame.image.load(file), (WIDTH, HEIGHT))
        dSurface = picture
        # dSurface = pygame.image.load(file).convert()
        bglist.append(dSurface)

def reset():
    global flag,runimage,nextimage,flag2,i,j,choose
    flag = False  # FALSE没有切屏 TRUE 切屏
    flag2 = False
    i = 0
    j = 0
    choose = random.randint(0,3)
    if nextimage is None:
        nextimage = random.choice(bglist)
    if runimage is None:
        runimage = random.choice(bglist)
    else:
        runimage = nextimage
        nextimage = random.choice(bglist)

def run():
    global flag,runimage,flag2,nextimage,i,j,choose
    reset()
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT or event.type == pygame.K_F1:
                pygame.quit()
                sys.exit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == pygame.K_SPACE:
                    if flag is False:# FALSE没有切屏 TRUE 切屏
                        flag = True
                        flag2 = False
        screen.fill((255, 255, 255))  # 设置背景为白色
        if flag:
            screen.blit(nextimage, (0,0))
            print(i+WIDTH,j+HEIGHT)
            screen.blit(runimage, (i, j))
            if choose==0:
                i -= step
                if i <= -WIDTH:
                    flag2 = True
            elif choose==1:
                i += step
                if i >= WIDTH:
                    flag2 = True
            elif choose==2:
                j -= step
                if j <= -HEIGHT:
                    flag2 = True
            elif choose==3:
                j += step
                if j >= HEIGHT:
                    flag2 = True
        else:
            screen.blit(nextimage, (0, 0))
            screen.blit(runimage, (0, 0))
        if flag2:
            reset()
            # print(choose)
        fcclock.tick(fps)
        pygame.display.flip()  # 刷新窗口
        # time.sleep(10)

if __name__ == '__main__':
    init_image()
    run()

四、效果展现

五、第二个版本

（一）修改了核心代码

 if flag:
            if choose==0:
                i -= step
                screen.blit(nextimage, (i+WIDTH, 0))
                if i <= -WIDTH:
                    flag2 = True
            elif choose==1:
                screen.blit(nextimage, (i-WIDTH, 0))
                i += step
                if i >= WIDTH:
                    flag2 = True
            elif choose==2:
                screen.blit(nextimage, (0, j+HEIGHT))
                j -= step
                if j <= -HEIGHT:
                    flag2 = True
            elif choose==3:
                screen.blit(nextimage, (0, j-HEIGHT))
                j += step
                if j >= HEIGHT:
                    flag2 = True
            screen.blit(runimage, (i, j))
        else:
            screen.blit(nextimage, (0, 0))
            screen.blit(runimage, (0, 0))

（二）完整代码

import sys, pygame
import os
import random

pygame.init()  # 初始化pygame类
WIDTH = 600
HEIGHT = 600
screen = pygame.display.set_mode((WIDTH, HEIGHT))  # 设置窗口大小
pygame.display.set_caption('美丽的屏保')  # 设置窗口标题
tick = pygame.time.Clock()
fps = 60  # 设置刷新率，数字越大刷新率越高
fcclock = pygame.time.Clock()
bglist = []
flag = 0
runimage = None
nextimage = None
flag = False   # FALSE没有切屏 TRUE 切屏
flag2 = False
i = 0
j = 0
step = 10
choose = 0

def init_image():
    path = './image/'
    files = []
    dirs = os.listdir(path)
    for diretion in dirs:
        files.append(path + diretion)

    for file in files:
        picture = pygame.transform.scale(pygame.image.load(file), (WIDTH, HEIGHT))
        dSurface = picture
        # dSurface = pygame.image.load(file).convert()
        bglist.append(dSurface)

def reset():
    global flag,runimage,nextimage,flag2,i,j,choose
    flag = False  # FALSE没有切屏 TRUE 切屏
    flag2 = False
    i = 0
    j = 0
    choose = random.randint(0,3)
    if nextimage is None:
        nextimage = random.choice(bglist)
    if runimage is None:
        runimage = random.choice(bglist)
    else:
        runimage = nextimage
        nextimage = random.choice(bglist)

def run():
    global flag,runimage,flag2,nextimage,i,j,choose
    reset()
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT or event.type == pygame.K_F1:
                pygame.quit()
                sys.exit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == pygame.K_SPACE:
                    if flag is False:# FALSE没有切屏 TRUE 切屏
                        flag = True
                        flag2 = False
        screen.fill((255, 255, 255))  # 设置背景为白色
        if flag:
            if choose==0:
                i -= step
                screen.blit(nextimage, (i+WIDTH, 0))
                if i <= -WIDTH:
                    flag2 = True
            elif choose==1:
                screen.blit(nextimage, (i-WIDTH, 0))
                i += step
                if i >= WIDTH:
                    flag2 = True
            elif choose==2:
                screen.blit(nextimage, (0, j+HEIGHT))
                j -= step
                if j <= -HEIGHT:
                    flag2 = True
            elif choose==3:
                screen.blit(nextimage, (0, j-HEIGHT))
                j += step
                if j >= HEIGHT:
                    flag2 = True
            screen.blit(runimage, (i, j))
        else:
            screen.blit(nextimage, (0, 0))
            screen.blit(runimage, (0, 0))
        if flag2:
            reset()
            # print(choose)
        fcclock.tick(fps)
        pygame.display.flip()  # 刷新窗口
        # time.sleep(10)

if __name__ == '__main__':
    init_image()
    run()

（三）另一种效果

六、小结

Ok，V1和V2版本，两个版本，任君选择，比较简单，大家将就着看看啊。后面会有修订和更多有趣的案例，欢迎关注，感谢支持！

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