Pygame中实现平滑尾部跟随移动的教程

    if down:
       #-- the tail red change directions
        tail.y = player1.y - 80
        tail.x = player1.x
    # ... 类似地处理上、左、右方向

import pygame
from datetime import datetime, timedelta # 导入 datetime 和 timedelta
pygame.init()

# 游戏窗口设置
width = 500
height = 750
window = pygame.display.set_mode((height, width)) # 窗口尺寸 (750, 500)

# 玩家类定义
class Player:
    def __init__(self, x, y, width, height, color):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.color = color
        self.rect = pygame.Rect(x, y, width, height) # 注意：这里是 width, height
        self.speed = 5 # 玩家移动速度

    def draw(self):
        self.rect.topleft = (self.x, self.y)
        pygame.draw.rect(window, self.color, self.rect)

# 实例化玩家和尾巴
player_color = (255, 255, 255) # 白色
tail_color = (176, 58, 46)     # 红色

player1 = Player(180, 170, 50, 50, player_color) # 玩家
tail = Player(100, 170, 50, 50, tail_color)     # 尾巴

# 背景图片（请确保 '2.png' 文件存在于同一目录下，否则会报错）
try:
    bg = pygame.image.load('2.png')
except pygame.error:
    print("Warning: Background image '2.png' not found. Using black background.")
    bg = None

# 绘图函数
def draw():
    window.fill((0, 0, 0)) # 填充黑色背景
    if bg:
        window.blit(bg, (0, 0)) # 绘制背景图片
    player1.draw()
    tail.draw()

# 尾巴跟随延迟时间，例如0.3秒
tail_delay = timedelta(seconds=0.3)

# 存储玩家历史位置的列表：[(timestamp, (x, y)), ...]
player1_positions_record = []

# 玩家移动状态标志
right = False
left = False
up = False
down = False

# 主游戏循环
run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    # --- 核心逻辑：记录玩家位置并更新尾巴位置 ---
    # 1. 记录当前玩家位置和时间戳
    player1_positions_record.append((datetime.now(), (player1.x, player1.y)))

    # 2. 限制历史记录的长度，避免内存无限增长
    # 假设每秒270帧，0.3秒的延迟需要大约81个位置点。
    # 保持500个记录足够覆盖几秒的延迟，且不占用过多内存。
    if len(player1_positions_record) > 500:
        player1_positions_record = player1_positions_record[-500:]

    # 3. 根据延迟时间查找尾巴应处于的历史位置
    current_time = datetime.now()
    for position_timestamp, (pos_x, pos_y) in player1_positions_record:
        # 找到第一个时间戳大于 (当前时间 - 延迟时间) 的记录
        # 这个记录代表了玩家在“延迟前”的某个位置
        if position_timestamp > current_time - tail_delay:
            tail.x = pos_x
            tail.y = pos_y
            break # 找到后即可退出循环

    # --- 玩家移动逻辑 (与原代码保持一致) ---
    keys = pygame.key.get_pressed()

    # 右移
    if not left and keys[pygame.K_RIGHT] and not keys[pygame.K_UP] and not keys[pygame.K_DOWN]:
        right = True
    if right:
        left = down = up = False
        player1.x += player1.speed

    # 左移
    if not right and keys[pygame.K_LEFT] and not keys[pygame.K_UP] and not keys[pygame.K_DOWN]:
        left = True
    if left:
        right = down = up = False
        player1.x -= player1.speed

    # 上移
    if not down and keys[pygame.K_UP]:
        up = True
    if up:
        down = left = right = False
        player1.y -= player1.speed

    # 下移
    if not up and keys[pygame.K_DOWN]:
        down = True
    if down:
        up = left = right = False
        player1.y += player1.speed

    # 绘制所有元素并更新显示
    draw()
    pygame.display.update()

pygame.quit()