pygame.sprite.spritecollide()不删除sprite

Question

嗨，据我所知，我正在用玩偶做一个破砖游戏。

pygame.sprite.spritecollide(ball, block_list, True, pygame.sprite.collide_mask)

这一部分确认了sprite组与sprite之间的碰撞，并从block_list中移除了碰撞的块对象。

为了更容易地看到与球的碰撞，这段代码允许球与鼠标自由移动，我认为用"print(block_list)“从组中移除被撞的墙壁，但是屏幕上的砖块没有被移除。

当球击中砖块时，如何使砖块从屏幕上脱落？

import pygame
import random


class Block(pygame.sprite.Sprite):
    def __init__(self, img):
        pygame.sprite.Sprite.__init__(self)
        self.image = img
        self.rect = img.get_rect()

pygame.init()
screen = pygame.display.set_mode((940, 768))

stickimage = pygame.image.load('stick.png')
stick = stickimage.get_rect()
stick.center = (500, 700)

background = pygame.Surface(screen.get_size())

pic = [pygame.image.load("half/brick1.png").convert_alpha(), pygame.image.load("half/brick2.png").convert_alpha(),
       pygame.image.load("half/brick3.png").convert_alpha(), pygame.image.load("half/brick4.png").convert_alpha()]

block_list = pygame.sprite.Group()

for j in range(0, 5):
    for i in range(0, 7):
        block = Block(pic[random.randrange(4)])
        block.rect.x = i * 135
        block.rect.y = j * 30
        block.mask = pygame.mask.from_surface(block.image)
        block_list.add(block)

ball_pic = pygame.image.load("ball.png").convert_alpha()
ball = Block(ball_pic)
ball.rect.center = (500, 500)
ball.mask = pygame.mask.from_surface(ball.image)
ball.radius = 23

score = 0

done = True

while done:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:  
            done = False  
        if event.type == pygame.MOUSEMOTION: 
            ball.rect.center = event.pos
        break

    hit_list = pygame.sprite.spritecollide(ball, block_list, True, pygame.sprite.collide_mask)

    for h in hit_list:
        score += 1

    print(block_list)
    print(hit_list)

    block_list.draw(background)  
    
    screen.blit(background, (0, 0))  
    screen.blit(ball.image, ball.rect)
    screen.blit(stickimage, stick)

    pygame.display.flip()  

Answer 1

我建议将雪碧的pygame.Surface转换为具有convert_alpha()的曲面。可以在Sprite对象的构造函数中创建mask属性：

class Block(pygame.sprite.Sprite):
    def __init__(self, img):
        pygame.sprite.Sprite.__init__(self)
        self.image = img.convert_alpha()                 # <----
        self.rect = img.get_rect()
        self.mask = pygame.mask.from_surface(self.image) # <----

无论如何，主要的问题是，你在背景表面而不是窗口表面上画砖块：

block_list.draw(background)  

背景表面永远不会被清除。在窗口中绘制背景，然后在背景顶部绘制砖块：

while done:
    # [...]

    screen.blit(background, (0, 0))  
    block_list.draw(screen)      
    screen.blit(ball.image, ball.rect)
    screen.blit(stickimage, stick)

    pygame.display.flip()