def __init__(self, scr, view_point, explosions, track):
"""Input parameters:
scr - Surface for drawing;
view_point - ViewPoint class instance;
explosions - Explosions class instance for asteroid blowing;
track - Track class instance (needed for spawning)."""
self.scr = scr
self.view_pt = view_point
self.explosions = explosions
self.track = track
self.spawn_density = 0
# Format: [(center_x, center_y),...]
self.spawns = []
self.images = []
self.masks = []
for filename in ASTEROID_FILES:
image = pygame.image.load(f"img/{filename}")
self.images.append(image)
# Creating bitmasks for each frame of each asteroid image
asteroid = AnimatedSprite(image, self.scr, self.view_pt,
FRAME_COLS, FRAME_ROWS)
asteroid_masks = []
for frame in range(0, asteroid.get_max_frame() + 1):
mask_image = pygame.Surface(asteroid.rect.size,
pygame.SRCALPHA, image)
mask_image.fill((0, 0, 0, 0))
mask_image.blit(image, (0, 0), asteroid._get_frame_rect(frame))
asteroid_masks.append(pygame.mask.from_surface(mask_image))
self.masks.append(asteroid_masks)
self.items = pygame.sprite.Group()
