我正在使用 Pygame 制作游戏，我正在尝试制作被子弹击中的小行星的动画。如果屏幕上只有一种小行星类型，则动画效果很好。当屏幕上出现两颗相同的小行星时，我遇到了麻烦。似乎第一个是唯一使用我的动画的。
例如，假设游戏产生了两个小行星，它们完全相同，我正在使用 glob.glob 获取 4 个动画图像，然后我将使用这些图像循环创建一个小动画他们。这适用于其中一颗小行星，另一颗不会播放动画。我想这一定是因为在任何时候只有一个对象可以使用特定图像？
对于糟糕的解释，我深表歉意。
这是我拥有的小行星类和创建动画的调用:
class Asteroid(pygame.sprite.Sprite):
def __init__(self, screen, size):
pygame.sprite.Sprite.__init__(self)
self.screen = screen
self.size = size
self.pos_x = random.randint(100,900)
pos_y= random.randint(100, 700)
self.pos_y = -pos_y
self.vel_y = 3
self.update_main = True
self.animation_path = ""
#load the image then put it above the screen, ready to drop
if self.size == "small":
self.asteroid_image = pygame.image.load("asteroid_small.tga")
self.animation_path = "C:/Programming/Stupid Games/Alien Invasion/animations/asteroid_small/*.tga"
elif self.size == "medium":
self.asteroid_image = pygame.image.load("asteroid_medium.tga")
self.animation_path = "C:/Programming/Stupid Games/Alien Invasion/animations/asteroid_medium/*.tga"
elif self.size == "med_large":
self.asteroid_image = pygame.image.load("asteroid_med_large.tga")
self.animation_path = "C:/Programming/Stupid Games/Alien Invasion/animations/asteroid_med_large/*.tga"
elif self.size == "small_med":
self.asteroid_image = pygame.image.load("asteroid_small_med.png")
elif self.size == "small_1":
self.asteroid_image = pygame.image.load("small1.tga")
self.animation_path = "C:/Programming/Stupid Games/Alien Invasion/animations/small/*.tga"
else:
self.asteroid_image = pygame.image.load("asteroid_large.tga")
self.animation_path = "C:/Programming/Stupid Games/Alien Invasion/animations/asteroid_large/*.tga"
#make the asteroid transparent
corner = self.asteroid_image.get_at((0,0))
self.asteroid_image.set_colorkey(corner, RLEACCEL)
#randomly rotate the image
self.new_asteroid_image = pygame.transform.rotate(self.asteroid_image, random.randint(0,340))
self.rect = self.new_asteroid_image.get_rect()
self.rect.x, self.rect.y = ((self.pos_x, self.pos_y))
self.start_animate = False
self.times = 0
#load the asteroid animation
self.animation = glob.glob(self.animation_path)
self.animation.sort()
self.animation_pos = 0
self.animation_max = len(self.animation)-1
self.animation_speed_init = 50
self.animation_speed = self.animation_speed_init
def update(self):
#if asteroid has left the screen, place it back to the top
if self.rect.y > 900:
pos_y = random.randint(100,500)
self.rect.y = -pos_y
self.rect.x = random.randint(100,900)
self.rect.y += self.vel_y
self.position = self.rect.x, self.rect.y
self.screen.blit(self.new_asteroid_image.convert(), self.position)
if self.start_animate == True:
self.animation_speed += 25
if self.animation_speed > 60:
self.update_main = False
self.new_asteroid = pygame.image.load(self.animation[self.times])
corner = self.new_asteroid.get_at((0,0))
self.new_asteroid.set_colorkey(corner, RLEACCEL)
self.new_asteroid_image = self.new_asteroid
self.animation_speed = 0
self.animation_pos += 1
self.times += 1
if self.times > self.animation_max:
self.kill()
def start_animation(self):
self.start_animate = True
#create asteroids at the start of the game
if keys[K_SPACE]:
game_over = False
player = Space_Ship("space_ship.tga", screen)
asteroid_small = Asteroid(screen, "small")
asteroid_large = Asteroid(screen, "large")
asteroid_medium = Asteroid(screen, "medium")
asteroid_med_large = Asteroid(screen, "med_large")
asteroid_group.add(asteroid_small, asteroid_large, asteroid_medium, asteroid_med_large)
player_group.add(player)
score = 0
#add asteroids after the game has started
if len(asteroid_group) < difficulty:
random_asteroid_number = random.randint(0,5)
if random_asteroid_number == 0:
#large asteroid
asteroid_large = Asteroid(screen, "large")
asteroid_group.add(asteroid_large)
elif random_asteroid_number == 1:
#medium asteroid
asteroid_medium = Asteroid(screen, "medium")
asteroid_group.add(asteroid_medium)
elif random_asteroid_number == 2:
#medium large asteroid
asteroid_med_large = Asteroid(screen, "med_large")
asteroid_group.add(asteroid_med_large)
elif random_asteroid_number == 3:
#small medium asteroid
asteroid_small_med = Asteroid(screen, "small_med")
asteroid_group.add(asteroid_small_med)
elif random_asteroid_number == 4:
#small_1 asteroid
asteroid_small_1 = Asteroid(screen, "small_1")
asteroid_group.add(asteroid_small_1)
else:
#small asteroid
asteroid_small = Asteroid(screen, "small")
asteroid_group.add(asteroid_small)
#bullet - asteroid collision
collisions = pygame.sprite.groupcollide(bullet_group, asteroid_group, True, False)
if collisions != None:
for i in collisions.values():
for sprite in i:
channel2.play(asteroid_audio)
if sprite == asteroid_large:
score += 3
sprite.start_animation()
elif sprite == asteroid_small_1 or sprite == asteroid_med_large or sprite == asteroid_medium or sprite == asteroid_small:
score += 1
sprite.start_animation()
else:
score += 1
sprite.kill()
请您参考如下方法:
虽然我不能确定，因为没有显示你调用更新的位，但我对它为什么这样做有一些想法。似乎没有调用第二颗小行星的更新。这可能有几个原因。第一个原因是如果你不实现小组来更新你的小行星。基本上，如果您只调用小行星的单个实例，则第二个实例不会执行任何操作，甚至不会显示在屏幕上。如果是这种情况，您将需要创建一个组，也许是一个渲染更新组，但即使是一个列表也可以。这意味着您可以执行以下操作:
asteroids.update()
或
for asteroid in asteroids:
asteroid.update()
以上两个代码假定您有某种小行星分组，称为小行星。
另一个可能的问题是，如果您正在实现组，则第二颗小行星没有被添加到该组中。如果你在init函数中告诉它把自己加到组里，就不会出现这个问题，但是，如果你在这个函数之外调用它，你做你的时候可能没有这样做第二颗小行星。要解决此问题，只需将添加小行星的部分移动到一个组中，该组将更新为小行星的 init 函数。
