Pygame：每隔x秒重复一次某个动作

Question

Pygame：每隔x秒重复一次某个动作

pythonpython-3.xpygame

3

我是一名Python初学者，正在学习使用Pygame构建简单游戏，在游戏中玩家（猴子）试图从屏幕顶部接住尽可能多的香蕉。

我的问题是如何让香蕉在每个x秒内单独生成并下落。不管是它们同时产生，还是如果我使用time.sleep，会暂停香蕉在空中。甚至在彻底迷失后使用了线程。

我的代码中相关组件如下:

catch_game

import sys

import pygame
from pygame.sprite import Group

from settings import Settings
# from background import Background
from monkey import Monkey
from banana import Banana

import functions

def run_game():
    pygame.init()
    settings = Settings()
    screen = pygame.display.set_mode((settings.screen_width, settings.screen_height))
    pygame.display.set_caption('Monkey Catch')

    monkey = Monkey(screen, settings)
    # background = Background((0, 0), screen)
    bananas = Group()

    functions.create_banana(screen, settings, bananas)

    while True:
        monkey.movement()
        functions.check_events(monkey)
        functions.update_screen(screen, settings, monkey, bananas)
        functions.update_banana(monkey, bananas)





run_game()

香蕉

import pygame
from pygame.sprite import Sprite
from random import randint


class Banana(Sprite):
    def __init__(self, screen, settings):
        super(Banana, self).__init__()
        self.screen = screen
        self.settings = settings


        self.image = pygame.image.load('E:\PycharmProjects\catch\images/banana.png')
        self.rect = self.image.get_rect()
        self.screen_rect = self.screen.get_rect()

        self.y = self.screen_rect.top
        self.y = float(self.rect.y)

        self.x = randint(0, 1150)

        self.speed = settings.banana_fallspeed

    def update(self):
        '''Banana falls down'''
        self.y += self.settings.banana_fallspeed

        self.rect.y = self.y
        self.rect.x = self.x

    def blit(self):
        self.screen.blit(self.image, self.rect)

函数

import pygame
import sys
from banana import Banana
import threading
import time


def update_screen(screen, settings, monkey, bananas):
    screen.fill([255, 255, 255])
    # background.blit()
    monkey.blit()

    for banana in bananas:
        banana.update()
        bananas.draw(screen)

    pygame.display.flip()


def keydown_events(event, monkey):
    if event.key == pygame.K_RIGHT:
        monkey.moving_right = True
    if event.key == pygame.K_LEFT:
        monkey.moving_left = True


def keyup_events(event, monkey):
    if event.key == pygame.K_RIGHT:
        monkey.moving_right = False
    if event.key == pygame.K_LEFT:
        monkey.moving_left = False


def check_events(monkey):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        if event.type == pygame.KEYDOWN:
            keydown_events(event, monkey)
        if event.type == pygame.KEYUP:
            keyup_events(event, monkey)


def create_banana(screen, settings, bananas):
        banana = Banana(screen, settings)
        bananas.add(banana)


def update_banana(monkey, bananas):
    '''kill bananas, collisions with monkey'''
    for banana in bananas.copy():
        if banana.rect.bottom >= 720:
            bananas.remove(banana)
    collision = pygame.sprite.spritecollide(monkey, bananas, True)
    if collision:
        bananas.remove(banana)


        # time.sleep(2)
        # fall_interval = banana.threading.Timer(3, create_banana(screen, settings, bananas))
        # fall_interval.start()

- ngong123

2个回答

0

您可以使用协程来同时运行函数，使用asyncio。例如：

import asyncio
import time

async def main():
    task1 = asyncio.create_task(
        say_after(1, 'hello'))

    task2 = asyncio.create_task(
        say_after(2, 'world'))

    print(f"started at {time.strftime('%X')}")

    # Wait until both tasks are completed (should take
    # around 2 seconds.)
    await task1
    await task2

    print(f"finished at {time.strftime('%X')}")

如果你为每个香蕉创建一个新任务，你应该能够在不同的时间将它们显示在屏幕上。

来源：https://docs.python.org/3/library/asyncio-task.html

- thomasreynolds4881

1

请尊重问题标记为pygame。 - Rabbid76

感谢建议！虽然比较难以理解，但我会研究协程作为一种技术。 - ngong123

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原文链接

- Rabbid76 · Accepted Answer

我建议使用计时器事件。使用pygame.time.set_timer()重复创建一个USEREVENT。例如：

banana_delay = 500 # 0.5 seconds
banana_event = pygame.USEREVENT + 1
pygame.time.set_timer(banana_event, banana_delay)

注意，在pygame中可以定义自定义事件。每个事件都需要一个唯一的ID。用户事件的ID必须在pygame.USEREVENT（24）和pygame.NUMEVENTS（32）之间。在本例中，pygame.USEREVENT+1是定时器事件的事件ID，用于生成子弹。

在事件循环中发生事件时，创建一个新的香蕉：

def check_events(screen, settings, bananas, monkey):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        # [...]

        if event.type == banana_event:
            create_banana(screen, settings, bananas)

计时器事件可以通过将时间参数设为0来停止。

如果您想按随机时间生成香蕉，则必须随机更改时间间隔（以毫秒为单位）。使用random.randint(a, b)生成随机时间：

if event.type == banana_event:
    create_banana(screen, settings, bananas)
    banana_delay = random.randint(500, 3000) # random from 0.5 to 3 seconds
    pygame.time.set_timer(banana_event, banana_delay)