Use Python to achieve the Matrix code rain effect (3 ways)

Speaking of the movie "The Matrix", I believe most people have seen or heard of it. There is a scene in the movie, digital rain. If you have watched the movie, you should be impressed with this classic scene. In this article, we use Python to use numbers, Letters, pictures, three forms to achieve this effect. +

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1. Numbers

First, let's implement the digital rain. We need to create a window to display the content. The creation of the window uses a  pygame library. The code is implemented as follows:

FONT_PX = 15
pygame.init()
winSur = pygame.display.set_mode((500, 600))
font = pygame.font.SysFont('fangsong', 20)
bg_suface = pygame.Surface((500, 600), flags=pygame.SRCALPHA)
pygame.Surface.convert(bg_suface)
bg_suface.fill(pygame.Color(0, 0, 0, 13))
winSur.fill((0, 0, 0))
# 数字
texts = [font.render(str(i), True, (0, 255, 0)) for i in range(10)]
colums = int(500 / FONT_PX)
drops = [0 for i in range(colums)]
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            exit()
    pygame.time.delay(33)
    winSur.blit(bg_suface, (0, 0))
    for i in range(len(drops)):
        text = random.choice(texts)
        winSur.blit(text, (i * FONT_PX, drops[i] * FONT_PX))
        drops[i] += 1
        if drops[i] * 10 > 600 or random.random() > 0.95:
            drops[i] = 0
    pygame.display.flip()

The effect is as follows:

2. Letters

Next, let's implement the letter rain. The basic way of implementation is to replace the numbers that implement the number rain above with letters. The code is implemented as follows:

PANEL_width = 400
PANEL_highly = 500
FONT_PX = 15
pygame.init()
# 创建一个窗口
winSur = pygame.display.set_mode((PANEL_width, PANEL_highly))
font = pygame.font.SysFont('123.ttf', 22)
bg_suface = pygame.Surface((PANEL_width, PANEL_highly), flags=pygame.SRCALPHA)
pygame.Surface.convert(bg_suface)
bg_suface.fill(pygame.Color(0, 0, 0, 28))
winSur.fill((0, 0, 0))
letter = ['q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'z', 'x', 'c',
          'v', 'b', 'n', 'm']
texts = [
    font.render(str(letter[i]), True, (0, 255, 0)) for i in range(26)
]
# 按窗口的宽度来计算可以在画板上放几列坐标并生成一个列表
column = int(PANEL_width / FONT_PX)
drops = [0 for i in range(column)]
while True:
    # 从队列中获取事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            exit()
        elif event.type == pygame.KEYDOWN:
            chang = pygame.key.get_pressed()
            if (chang[32]):
                exit()
    # 暂停给定的毫秒数
    pygame.time.delay(30)
    # 重新编辑图像
    winSur.blit(bg_suface, (0, 0))
    for i in range(len(drops)):
        text = random.choice(texts)
        # 重新编辑每个坐标点的图像
        winSur.blit(text, (i * FONT_PX, drops[i] * FONT_PX))
        drops[i] += 1
        if drops[i] * 10 > PANEL_highly or random.random() > 0.95:
            drops[i] = 0
    pygame.display.flip()

The effect is as follows:

3. Picture

Finally, we use pictures to achieve this effect. For pictures, let’s use raindrops. Here we use tkinter to create a window. The code is implemented as follows:

# 初始雨滴纵坐标
INIT_HEIGHT = 10
# 雨滴创建
def rainmake(canvas, imagefile):
    rainlist = []
    for i in range(5):
        # 根据图片，创建一排雨滴
        rainlist.append(canvas.create_image(100 + 80 * i, INIT_HEIGHT, anchor=NE, image=imagefile))
    return rainlist

# 雨滴下落
def raindown(tk, canvas, imagefile, sec):
    # 线程间等待
    time.sleep(sec)
    rainlist = rainmake(canvas, imagefile)
    # 每个雨滴的纵坐标值
    height = [INIT_HEIGHT] * 10
    while True:
        # 每次移动前稍等一会
        time.sleep(0.2)
        # 5 个雨滴一起移动
        for i in range(5):
            # 如果雨滴字到底了，则不继续移动
            if not height[i] == 0:
                # 设置下落步调
                rnd = random.randint(5, 50)
                canvas.move(rainlist[i], 0, rnd)
                height[i] = height[i] + rnd
                tk.update()
        for i,h in enumerate(height):
            if h > 400:
                # 当雨滴字走到最下方，则删除
                canvas.delete(rainlist[i])
                tk.update()
                # 清空该雨滴的 height
                height[i] = 0
                print(i,h,height)
        # 全到底，则跳出循环
        if height == [0] * 5:
            print('break:',threading.current_thread().name)
            break

def lookloop(tk, canvas, thread):
    aliveflg = False
    while True:
        # 5s 检测一次
        time.sleep(5)
        for th in thread:
            if th.is_alive():
                aliveflg = True
            else:
                aliveflg = False
        if aliveflg == False:
            break
    canvas.create_text(100 , 200, text='雨停了...', fill='red')
    canvas.pack()
    time.sleep(5)
    tk.destroy()

The effect is as follows: