如何清除Pygame中的精灵？

Question

Pygame具有用于clear类的方法Group，该方法用于将子画面分组在一起。当我在Group对象上调用clear时，我可以成功清除该组中所有子画面的图像，但是我的子画面的选择框仍然保留。我想知道是否还有另一种方法可以在不破坏精灵对象的情况下删除精灵的图像和矩形点击框。

Answer 1

您应该检查鼠标位置以及组中的元素和kill()元素是否要从组中删除。之后，您可以使用clean()从屏幕上删除所有元素，然后再次使用draw()仅重绘仍在组中的元素

        x, y = pygame.mouse.get_pos()

        for item in my_group:
            if item.rect.collidepoint(x, y):
                print("Collision detected")
                item.kill()
                my_group.clear(screen, background)
                my_group.draw(screen)

---

我在组中创建了两个元素，因此如果在draw()之后删除clear()，您会看到不同-它会从屏幕上删除所有元素

import pygame

# --- constants ---

# Define some colors
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

SIZE = (700, 500)

# --- classes ---

class Block(pygame.sprite.Sprite):
    # Constructor. Pass in the color of the block,
    # and its x and y position
    def __init__(self, color, width, height):
        # Call the parent class (Sprite) constructor
        super().__init__()

        # Create an image of the block, and fill it with a color.
        # This could also be an image loaded from the disk.
        self.image = pygame.image.load("Obrazy/images/square-1.png").convert()

        # Fetch the rectangle object that has the dimensions of the image
        # Update the position of this object by setting the values of rect.x and rect.y
        self.rect = self.image.get_rect()

# --- functions ---

# empty

# --- main ---

pygame.init()

# Set the height and width of the screen
screen = pygame.display.set_mode(SIZE)

pygame.display.set_caption("Testing Screen")

# Loop until the user clicks the close button.
done = False

# Used to manage how fast the screen updates
clock = pygame.time.Clock()

my_block1 = Block(WHITE, 20, 20)
my_block2 = Block(WHITE, 20, 20)
my_block2.rect.x = 100

my_group = pygame.sprite.Group()
my_group.add(my_block1)
my_group.add(my_block2)

background = pygame.Surface(SIZE)

screen.fill(BLACK)
#screen.blit(background, (0,0))
my_group.draw(screen)

# -------- Main Program Loop -----------

while not done:
    # Set the screen background
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        if event.type == pygame.MOUSEBUTTONDOWN:
            x, y = pygame.mouse.get_pos()

            for item in my_group:
                if item.rect.collidepoint(x, y):
                    print("Collision detected")
                    item.kill()
                    my_group.clear(screen, background)
                    my_group.draw(screen)

    # Limit to 60 frames per second
    clock.tick(60)

    #my_group.clear(screen, background)
    #my_group.draw(screen)

    # Go ahead and update the screen with what we've drawn.
    pygame.display.flip()

# Be IDLE friendly. If you forget this line, the program will 'hang'
# on exit.
pygame.quit()

---

BTW：在Python 3中，您可以使用

super().__init__() 

而不是

pygame.sprite.Sprite.__init__(self)