Pygame平滑跟随运动实现教程

    if down:
       #-- the tail red change directions
        tail.y = player1.y - 80
        tail.x = player1.x
    # ... 其他方向类似

import pygame
from datetime import datetime, timedelta

pygame.init()

# 尾部跟随的延迟时间（秒）
tail_delay = timedelta(seconds=0.3) 

# 窗口设置
# 注意：原始代码中width和height在set_mode时可能被交换，这里进行修正
SCREEN_WIDTH = 750
SCREEN_HEIGHT = 500
window = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption("Pygame Smooth Following Movement")

# 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：rect的width和height应与传入参数一致
        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)

# 初始化玩家和尾部
player_color = (255, 255, 255) # 白色
tail_color = (176, 58, 46)     # 红色

player1 = Player(SCREEN_WIDTH // 2 - 25, SCREEN_HEIGHT // 2 - 25, 50, 50, player_color)
tail = Player(player1.x, player1.y, 50, 50, tail_color) # 尾部初始位置与玩家相同

# 背景图片加载 (请确保 '2.png' 存在于项目目录)
try:
    bg = pygame.image.load('2.png')
    bg = pygame.transform.scale(bg, (SCREEN_WIDTH, SCREEN_HEIGHT)) # 缩放背景以适应窗口
except pygame.error:
    print("Warning: Background image '2.png' not found or could not be loaded. Using black background.")
    bg = None

def draw_elements():
    if bg:
        window.blit(bg, (0, 0))
    else:
        window.fill((0, 0, 0)) # 黑色背景

    player1.draw()
    tail.draw()
    pygame.display.update()

# 运动状态标志
right = False
left = False
up = False
down = False

# 存储玩家历史位置的列表
# 每个元素是一个元组：(时间戳, (x坐标, y坐标))
player1_positions_record = []

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

    # 记录玩家当前位置及时间戳
    player1_positions_record.append((datetime.now(), (player1.x, player1.y)))

    # 限制历史记录的长度，避免内存占用过大
    # 假设每秒帧数约为60，0.3秒的延迟，记录500个点足够覆盖几秒内的历史
    if len(player1_positions_record) > 500: 
        player1_positions_record = player1_positions_record[-500:] # 只保留最新的500个记录

    # 计算尾部应跟随的过去位置
    right_now = datetime.now()
    found_tail_pos = False
    # 从最老的记录开始查找，直到找到第一个时间戳在 (当前时间 - 延迟时间) 之后的记录
    for position_timestamp, (px, py) in player1_positions_record:
        if position_timestamp > right_now - tail_delay:
            tail.x = px
            tail.y = py
            found_tail_pos = True
            break

    # 如果记录太少，可能找不到足够的历史位置，此时让尾部停留在当前玩家位置
    if not found_tail_pos and player1_positions_record:
        # 如果没有找到足够老的点，就用最早的那个点
        _, (px, py) = player1_positions_record[0]
        tail.x = px
        tail.y = py

    # 检查按键并更新玩家位置
    keys = pygame.key.get_pressed()

    # 玩家移动逻辑 (原始代码的简化版，避免多余的布尔判断)
    # 这里的逻辑可以根据实际游戏需求进行优化，例如处理对角线移动或更精细的按键组合
    if keys[pygame.K_LEFT]:
        player1.x -= player1.speed
        left, right, up, down = True, False, False, False
    elif keys[pygame.K_RIGHT]:
        player1.x += player1.speed
        left, right, up, down = False, True, False, False
    elif keys[pygame.K_UP]:
        player1.y -= player1.speed
        left, right, up, down = False, False, True, False
    elif keys[pygame.K_DOWN]:
        player1.y += player1.speed
        left, right, up, down = False, False, False, True
    else: # 如果没有按键，停止移动（可选，取决于游戏设计）
        left, right, up, down = False, False, False, False

    # 绘制所有元素
    draw_elements()

pygame.quit()