import turtle
import random
import time

# 设置屏幕
screen = turtle.Screen()
screen.title("贪吃蛇小游戏")
screen.bgcolor("lightgreen")
screen.setup(width=600, height=600)
screen.tracer(0)  # 关闭自动刷新

# 创建蛇头
head = turtle.Turtle()
head.shape("square")
head.color("black")
head.penup()
head.goto(0, 0)
head.direction = "stop"

# 创建食物
food = turtle.Turtle()
food.shape("circle")
food.color("red")
food.penup()
food.goto(100, 100)

# 创建蛇的身体
segments = []

# 设置得分
score = 0
high_score = 0

# 记分板
pen = turtle.Turtle()
pen.hideturtle()
pen.penup()
pen.goto(0, 260)
pen.write("得分: 0  最高得分: 0", align="center", font=("Arial", 18, "normal"))

# 控制方向的函数
def go_up():
    if head.direction != "down":
        head.direction = "up"

def go_down():
    if head.direction != "up":
        head.direction = "down"

def go_left():
    if head.direction != "right":
        head.direction = "left"

def go_right():
    if head.direction != "left":
        head.direction = "right"

# 移动函数
def move():
    if head.direction == "up":
        head.sety(head.ycor() + 20)
    if head.direction == "down":
        head.sety(head.ycor() - 20)
    if head.direction == "left":
        head.setx(head.xcor() - 20)
    if head.direction == "right":
        head.setx(head.xcor() + 20)

# 键盘绑定
screen.listen()
screen.onkey(go_up, "Up")
screen.onkey(go_down, "Down")
screen.onkey(go_left, "Left")
screen.onkey(go_right, "Right")

# 主游戏循环
while True:
    screen.update()

    # 碰撞边界
    if abs(head.xcor()) > 290 or abs(head.ycor()) > 290:
        time.sleep(1)
        head.goto(0, 0)
        head.direction = "stop"

        for segment in segments:
            segment.goto(1000, 1000)
        segments.clear()
        score = 0
        pen.clear()
        pen.write(f"得分: {score}  最高得分: {high_score}", align="center", font=("Arial", 18, "normal"))

    # 吃到食物
    if head.distance(food) < 20:
        # 随机移动食物
        x = random.randint(-14, 14) * 20
        y = random.randint(-14, 14) * 20
        food.goto(x, y)

        # 增加身体
        new_segment = turtle.Turtle()
        new_segment.shape("square")
        new_segment.color("gray")
        new_segment.penup()
        segments.append(new_segment)

        # 更新分数
        score += 10
        if score > high_score:
            high_score = score
        pen.clear()
        pen.write(f"得分: {score}  最高得分: {high_score}", align="center", font=("Arial", 18, "normal"))

    # 移动身体部分
    for i in range(len(segments) - 1, 0, -1):
        x = segments[i - 1].xcor()
        y = segments[i - 1].ycor()
        segments[i].goto(x, y)
    if segments:
        segments[0].goto(head.xcor(), head.ycor())

    move()

    # 蛇碰到自己
    for segment in segments:
        if head.distance(segment) < 20:
            time.sleep(1)
            head.goto(0, 0)
            head.direction = "stop"

            for segment in segments:
                segment.goto(1000, 1000)
            segments.clear()
            score = 0
            pen.clear()
            pen.write(f"得分: {score}  最高得分: {high_score}", align="center", font=("Arial", 18, "normal"))

    time.sleep(0.1)
