python - 物体碰撞时播放声音

Question

我尝试在对象 ball 与 angryball 碰撞时播放 ouch 声音，但声音并不总是播放。当两个对象位于相同的 x 或 y 坐标时，它会在第一次碰撞时开始，但此后它不会在以后的碰撞中正确播放。也许这是我在如何处理它们的坐标以检查碰撞方面的错误？

import pygame
import os
import random

size = width, height = 750, 422
screen = pygame.display.set_mode(size)

img_path = os.path.join(os.getcwd())
background_image = pygame.image.load('background.jpg').convert()
bg_image_rect = background_image.get_rect()
pygame.mixer.pre_init(44100, 16, 2, 4096)

pygame.display.set_caption("BallGame")

class Ball(object):
    def __init__(self):
        self.image = pygame.image.load("ball.png")
        self.image_rect = self.image.get_rect()
        self.image_rect.x
        self.image_rect.y
        self.facing = 'LEFT'

    def handle_keys(self):
        key = pygame.key.get_pressed()
        dist = 5
        if key[pygame.K_DOWN] and self.image_rect.y < 321:
            self.facing = 'DOWN'
            self.image_rect.y += dist
        elif key[pygame.K_UP] and self.image_rect.y > 0:
            self.facing = 'UP'
            self.image_rect.y -= dist
        if key[pygame.K_RIGHT] and self.image_rect.x < 649:
            self.facing = 'RIGHT'
            self.image_rect.x += dist
        elif key[pygame.K_LEFT] and self.image_rect.x > 0:
            self.facing = 'LEFT'
            self.image_rect.x -= dist

    def draw(self, surface):
        if self.facing == "RIGHT":
            surface.blit(pygame.transform.flip(self.image, True, False),(self.image_rect.x,self.image_rect.y))
        elif self.facing == "DOWN":
            surface.blit(pygame.image.load("ball_down.png"),(self.image_rect.x,self.image_rect.y))
        if self.facing == "UP":
            surface.blit(pygame.image.load("ball_up.png"),(self.image_rect.x,self.image_rect.y))
        elif self.facing == "LEFT":
            surface.blit(self.image,(self.image_rect.x,self.image_rect.y))


mob_images = [pygame.image.load("image1.png").convert_alpha(),pygame.image.load("image2.png").convert_alpha(),pygame.image.load("image3.png").convert_alpha(),pygame.image.load("image4.png").convert_alpha(),pygame.image.load("image5.png").convert_alpha()]

class Angryball(pygame.sprite.Sprite):
    def __init__(self, mob_images, pos_x, pos_y):
        super(Angryball, self).__init__()
        self.mob_images = mob_images
        self.image = random.choice(self.mob_images)
        self.rect = self.image.get_rect(x=pos_x, y=pos_y)
        self.facing = 'LEFT'

    def update(self, screen):
        if self.rect.x <= 0:
            self.rect.right = screen.get_rect().width
            self.rect.top = random.randint(0, screen.get_rect().height)
            self.image = random.choice(self.mob_images)
        else:
            self.rect.move_ip(-5, 0)

pygame.init()
screen = pygame.display.set_mode((750, 422))

ball = Ball()
angryball = Angryball(mob_images , 700, random.randrange(400))
sprites = pygame.sprite.Group()
sprites.add(angryball)

clock = pygame.time.Clock()

pygame.mixer.music.load("bg_music.mp3")
pygame.mixer.music.play(-1, 0.0)
ouch = pygame.mixer.Sound("border_sound.wav")

running = True
while running:
    esc_key = pygame.key.get_pressed()
    for event in pygame.event.get():
        if esc_key[pygame.K_ESCAPE]:
            pygame.display.quit()
            pygame.quit()
            running = False

    if ball.image_rect.x == angryball.rect.x:
        ouch.play()
    if ball.image_rect.y == angryball.rect.y:
        ouch.play()


    ball.handle_keys()

    screen.blit(background_image, bg_image_rect)
    screen.blit(background_image, bg_image_rect.move(bg_image_rect.width, 0))
    bg_image_rect.move_ip(-2, 0)
    if bg_image_rect.right <= 0:
        bg_image_rect.x = 0

    sprites.update(screen)
    sprites.draw(screen)

    ball.draw(screen)
    pygame.display.update()

    clock.tick(60)

Answer 1

您需要替换这些行，

if ball.image_rect.x == angryball.rect.x:
    ouch.play()
if ball.image_rect.y == angryball.rect.y:
    ouch.play()

用这个(检查两个矩形是否碰撞):

if ball.image_rect.colliderect(angryball.rect):
    ouch.play()

现在的问题是，声音会在两个对象碰撞的每一帧中播放，因此声音会变得很大(最多会在 8 个 channel 中同时播放)。此外，如果所有 channel 都被占用，如果多个物体在短时间内连续碰撞，声音播放可能会被跳过。

为了防止这种情况发生，您可以为 Angryball 指定一个 collided 属性( bool 值)，并在第一次碰撞后将其设置为 True。然后在一段时间间隔后或在重置位置的同时将其重置为 False。

if ball.image_rect.colliderect(angryball.rect) and not angryball.collided:
    angryball.collided = True
    ouch.play()