在 Pygame 中通过按钮单击调用函数答案

【问题标题】：Call function by button click in Pygame在 Pygame 中通过按钮单击调用函数
【发布时间】：2019-10-03 06:30:12
【问题描述】：

在下面的代码中，我在 Pygame 中得到了一个带有按钮的屏幕。现在我想点击按钮，然后random() 函数启动，5 秒后它从按钮开始返回屏幕，让我可以选择再次点击并再次调用随机函数。

def loop():
    clock = pygame.time.Clock()
    number = 0
    # The button is just a rect.
    button = pygame.Rect(300,300,205,80)
    done = False
    while not done:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                done = True
            # This block is executed once for each MOUSEBUTTONDOWN event.
            elif event.type == pygame.MOUSEBUTTONDOWN:
                # 1 is the left mouse button, 2 is middle, 3 is right.
                if event.button == 1:
                    # `event.pos` is the mouse position.
                    if button.collidepoint(event.pos):
                        # Incremt the number.
                        number += 1

random()
loop()
pygame.quit()

【问题讨论】：

标签： python button pygame

【解决方案1】：

添加一个状态变量（runRandom），表示函数random是否必须运行：

runRandom = False
while not done:

    # [...]

    if runRandom:
        random()

添加用户定义的pygame.event，可用于定时器：

runRandomEvent = pygame.USEREVENT + 1

for event in pygame.event.get():

   # [...]

   elif event.type == runRandomEvent:
      # [...]

如果random 没有运行，则允许按下按钮。如果按下按钮，则状态 runRandom 并以确定的时间段（例如 5000 毫秒 = 5 秒）启动计时器 (pygame.time.set_timer())：

# [...]

elif event.type == pygame.MOUSEBUTTONDOWN:
    if event.button == 1:
        if button.collidepoint(event.pos) and not runRandom:
            # [...]

            runRandom = True
            pygame.time.set_timer(runRandomEvent, 5000)

当时间过去后，通过runRandom = False停止运行random并停止计时器：

# [...]

elif event.type == runRandomEvent:
    runRandom = False
    pygame.time.set_timer(runRandomEvent, 0)

以某种方式将建议应用于您的代码：

# define user event for the timer
runRandomEvent = pygame.USEREVENT + 1

def loop():
    clock = pygame.time.Clock()
    number = 0
    # The button is just a rect.
    button = pygame.Rect(300,300,205,80)
    done = False
    runRandom = False
    while not done:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                done = True
            # This block is executed once for each MOUSEBUTTONDOWN event.
            elif event.type == pygame.MOUSEBUTTONDOWN:
                # 1 is the left mouse button, 2 is middle, 3 is right.
                if event.button == 1:
                    # `event.pos` is the mouse position and  "random" is not running
                    if button.collidepoint(event.pos) and not runRandom:
                        # Incremt the number.
                        number += 1

                        # Start timer and enable running "random"
                        runRandom = True
                        pygame.time.set_timer(runRandomEvent, 5000) # 5000 milliseconds

            elif event.type == runRandomEvent:
                runRandom = False
                pygame.time.set_timer(runRandomEvent, 0)

        # [...]

        # run "random"
        if runRandom:
            random()

        # [...]

【讨论】：