在这个pygame程序中，我正在尝试制作一个slither.io游戏，在slither.io中，当蛇接触其中一个球体时，球体应该被蛇吃掉并消失，但由于某种原因几乎当蛇只触及其中一个球体时，列表中的所有球体都会被删除。
这是代码的一部分。
for snake in snake_group:
snake.head_tail_length = 0
for ele in [x for x in blob_list if 620 > x[1] > 0 and 620 > x[2] > 0 \
and 0 < abs(snake.head_segment[0] - x[1]) < 20 and 0 < abs(snake.head_segment[1] - x[2]) < 20]:
blob_list.remove(ele)
pygame.display.update()
但这是完整的代码：
import pygame
import math
import random
pygame.init()
screen = pygame.display.set_mode((620, 620))
screen.fill((20, 20, 20))
pygame.display.set_caption("Slither IO")
clock = pygame.time.Clock()
font = pygame.font.Font('freesansbold.ttf', 32)
run = True
temp_speed = 0.3
snake_x_change = 0
snake_y_change = 0
ult_diff = 0
piece_grp = []
cob_list = []
player_x_coords, player_y_coords = 310, 310
div = 0
CYAN = (0, 200, 200)
GREEN = (50, 255, 50)
YELLOW = (200,200,0)
ORANGE = (255,165,0)
RED = (255, 100, 100)
MAGENTA = (255,0,255)
color_list = [CYAN, GREEN, YELLOW, ORANGE, RED, MAGENTA]
blob_list = []
blob_rect_list = []
for i in range(250):
blob_list.append([random.choice(color_list), random.randrange(0, 5000) + snake_x_change,\
random.randrange(0, 5000) + snake_y_change, random.randrange(8, 15)])
class Snake:
def __init__(self, x_coord, y_coord, size):
self.x_coord = x_coord
self.y_coord = y_coord
self.size = size
self.segments = [[self.x_coord, self.y_coord]] * size
self.head_segment = None
self.cursor_head_length = None
self.head_tail_length = 0
self.head_rect = pygame.Rect(self.x_coord, self.y_coord, 40, 40)
def movement(self, current_x, current_y, target_x, target_y, speed):
global length
length = math.sqrt((target_x - current_x) ** 2 + (target_y - current_y) ** 2)
new_x = current_x + ((target_x - current_x) / length) * speed
new_y = current_y + ((target_y - current_y) / length) * speed
return [new_x, new_y]
for i in range(len(blob_list)):
cob_list.append((blob_list[i][1], blob_list[i][2]))
blob_rect_list.append(pygame.Rect(blob_list[i][1], blob_list[i][2], blob_list[i][3] * 2, blob_list[i][3] * 2))
snake_group = []
player_snake = Snake(310, 310, 15)
snake_group.append(player_snake)
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
for i in range(len(blob_list)):
blob_list[i][1] = cob_list[i][0] - snake_group[0].x_coord - 310
blob_list[i][2] = cob_list[i][1] - snake_group[0].y_coord - 310
blob_rect_list[i][0] = cob_list[i][0] - snake_group[0].x_coord - 310
blob_rect_list[i][1] = cob_list[i][0] - snake_group[0].x_coord - 310
cursor_pos = pygame.mouse.get_pos()
prev_diff_x, prev_diff_y = snake_group[0].x_coord - 310, snake_group[0].y_coord - 310
player_x_coords, player_y_coords = player_snake.movement(
player_x_coords, player_y_coords, cursor_pos[0], cursor_pos[1], 0.003
)
if round(length) == 0:
player_x_coords, player_y_coords = 310, 310
for snake in snake_group:
snake.head_segment = snake.movement(
snake.x_coord, snake.y_coord, cursor_pos[0], cursor_pos[1], 0.3
)
snake.segments[0] = snake.head_segment
head_rect = pygame.Rect(snake.head_segment[0], snake.head_segment[1], 40, 40)
snake.cursor_head_length = math.sqrt(
(cursor_pos[0] - snake.x_coord) ** 2 + (cursor_pos[1] - snake.y_coord) ** 2
)
for snake in snake_group:
for i in range(1, snake.size):
snake.head_tail_length += math.sqrt(
(snake.segments[i - 1][0] - snake.segments[i][0]) ** 2 +
(snake.segments[i - 1][1] - snake.segments[i][1]) ** 2
)
screen.fill((20, 20, 20))
for i in range(len(blob_list)):
blob_list[i][1] -= (player_x_coords - 310) * 50
blob_list[i][2] -= (player_y_coords - 310) * 50
pygame.draw.circle(screen, blob_list[i][0], (blob_list[i][1], blob_list[i][2]), blob_list[i][3])
for snake in snake_group:
ult_diff = [snake.head_segment[0] - 310, \
snake.head_segment[1] - 310]
for piece in snake.segments:
piece[0] -= ult_diff[0]
piece[1] -= ult_diff[1]
for snake in snake_group:
pygame.draw.circle(
screen, (255, 255, 255), (int(snake.head_segment[0]), int(snake.head_segment[1])), 20, 20
)
snake.x_coord, snake.y_coord = snake.head_segment
for snake in snake_group:
if round(snake.cursor_head_length) != 0:
for i in range(1, snake.size):
if snake.head_tail_length < 15 * snake.size:
temp_speed -= 0.01
elif snake.head_tail_length > 15 * snake.size:
temp_speed += 0.01
other_segment = snake.movement(
snake.segments[i][0], snake.segments[i][1],
snake.segments[i - 1][0], snake.segments[i - 1][1], temp_speed
)
pygame.draw.circle(
screen, (255, 255, 255), (int(other_segment[0]), int(other_segment[1])), 20, 20
)
snake.segments[i] = other_segment
else:
for segment in snake.segments:
pygame.draw.circle(
screen, (255, 255, 255), (int(segment[0]), int(segment[1])), 20, 20
)
temp_speed = 0.3
for snake in snake_group:
snake.head_tail_length = 0
for ele in [x for x in blob_list if 620 > x[1] > 0 and 620 > x[2] > 0 \
and 0 < abs(snake.head_segment[0] - x[1]) < 20 and 0 < abs(snake.head_segment[1] - x[2]) < 20]:
blob_list.remove(ele)
pygame.display.update()
我尝试了 pygame 中内置的不同碰撞函数，但它们似乎不起作用， 我也尝试使用“pop”而不是“remove”。
迭代时从列表中删除元素可能会带来惊喜。
我建议将您的代码调整为：
for snake in snake_group:
snake.head_tail_length = 0
new_blob_list = []
for ele in blob_list:
if 620 > ele[1] > 0 and 620 > ele[2] > 0 and 0 < abs(snake.head_segment[0] - ele[1]) < 20 and 0 < abs(snake.head_segment[1] - ele[2]) < 20:
# Blob is eaten, do not add to new_blob_list
continue
new_blob_list.append(ele)
blob_list = new_blob_list
pygame.display.update()