pygame.sprite.spritecollide 只删除敌人

Question

我正在制作一个宇宙飞船游戏，你可以控制一艘宇宙飞船并向敌人发射子弹。我现在正试图让玩家和敌人的飞船在玩家和敌人发生碰撞时都消失。但是当我尝试使用 pygame.sprite.spritecollide 时，只有敌人消失了。为什么是这样？这是因为 spritecollide 仅从其组中删除精灵吗？（我把dokill设置为True）

这是我当前的代码：

import pygame
from pygame.locals import *
from random import randint
from tools import *

pygame.init()
pygame.font.init()
screen = pygame.display.set_mode((800, 500))


class Spaceship(pygame.sprite.Sprite):

    def __init__(self, s, x, y):
        pygame.sprite.Sprite.__init__(self)

        self.screen = s
        self.x, self.y = x, y
        self.image = pygame.image.load("spaceship.png")
        self.image = pygame.transform.scale(self.image, (175, 175))
        self.rect = self.image.get_rect()
        self.rect.center = (self.x, self.y)

    def update(self):
        self.rect.center = (self.x, self.y)


class Bullet(pygame.sprite.Sprite):

    def __init__(self, s, x, y):
        pygame.sprite.Sprite.__init__(self)

        self.screen = s
        self.x, self.y = x, y
        self.image = pygame.image.load("bullet.png")
        self.image = pygame.transform.scale(self.image, (100, 100))
        self.rect = self.image.get_rect()
        self.rect.center = (self.x, self.y)

    def update(self):
        self.y -= 5
        self.rect.center = (self.x, self.y)
        if self.y < 0:
            self.kill()


class Enemy(pygame.sprite.Sprite):

    def __init__(self, s, x, y, t):
        pygame.sprite.Sprite.__init__(self)

        self.type = t
        self.screen, self.x, self.y = s, x, y
        self.image = pygame.image.load("enemy.png")
        self.image = pygame.transform.scale(self.image, (235, 215))
        self.rect = self.image.get_rect()
        self.rect = self.image.get_rect()
        self.rect.center = (self.x, self.y)
        self.score_given = get_enemy_given_score()[self.type]

    def update(self):
        if self.y < 0:
            self.kill()
        self.y += 3
        self.rect.center = (self.x, self.y)


spaceship = Spaceship(screen, 400, 400)

bullets = pygame.sprite.Group()
enemies = pygame.sprite.Group()

clock = pygame.time.Clock()

enemy_interval = 5000  # It's in milliseconds
enemy_event = pygame.USEREVENT + 1
pygame.time.set_timer(enemy_event, enemy_interval)

score = 0

font = pygame.font.SysFont("Arial", 30)
textsurface = font.render("Score: {:,}".format(score), True, (0, 0, 0))

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        if event.type == MOUSEBUTTONDOWN:
            bullet = Bullet(screen, spaceship.x, spaceship.y - 20)
            bullets.add(bullet)

        if event.type == enemy_event:
            enemy = Enemy(screen, randint(-150, 750), 0, "normal")
            enemies.add(enemy)

    bullets.update()

    key = pygame.key.get_pressed()
    amount = 5

    if key[pygame.K_a]:
        spaceship.x -= amount
    elif key[pygame.K_d]:
        spaceship.x += amount
    elif key[pygame.K_w]:
        spaceship.y -= amount
    elif key[pygame.K_s]:
        spaceship.y += amount

    spaceship.update()

    screen.fill((255, 255, 255))

    screen.blit(spaceship.image, spaceship.rect)

    bullets.draw(screen)
    enemies.draw(screen)

    for i in enemies:
        i.update()
        if pygame.sprite.spritecollide(i, bullets, True):
            score += i.score_given
            i.kill()

    if score >= 99999:
        score = 99999

    textsurface = font.render("Score: {:,}".format(score), True, (0, 0, 0))
    screen.blit(textsurface, (590, 0))

    pygame.sprite.spritecollide(spaceship, enemies, dokill=True)

    pygame.display.update()
    clock.tick(60)

有人可以帮我吗？

Answer 1

spaceship 不能“消失”，因为您只有 Spaceship class 的 1 个实例，并且您无法将其从 Groups（kill）。不想再看到飞船就别画了:

spaceship_collided = False

running = True
while running:
    # [...]

    if not spaceship_collided:
        screen.blit(spaceship.image, spaceship.rect)

    # [...]

    if pygame.sprite.spritecollide(spaceship, enemies, dokill=True):
        spaceship_collided = True

    # [...]

另一种解决方案是使用 pygame.sprite.GroupSingle:

spaceship_group = pygame.sprite.GroupSingle(Spaceship(screen, 400, 400))

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        if event.type == MOUSEBUTTONDOWN:
            
            if len(spaceship_group) > 0:
                spaceship = spaceship_group.sprites()[0]
                bullet = Bullet(screen, spaceship.x, spaceship.y - 20)
                bullets.add(bullet)

    # [...]

    spaceship_group.draw(screen)

    # [...]

    spaceship_group.update()

    # [...]
    
    pygame.sprite.groupcollide(spaceship_group, enemies, True, True)

    # [...]

pygame.sprite.spritecollide 只删除敌人

pygame.sprite.spritecollide only deleting enemy

python

pygame

python-3.8