import turtle

# 设置屏幕和画笔
screen = turtle.Screen()
screen.title("简易井字棋")
pen = turtle.Turtle()
pen.hideturtle()
pen.speed(0)
pen.pensize(3)

# 当前玩家（X 先手）
current_player = "X"
# 保存每格的内容（3x3）
board = [["" for _ in range(3)] for _ in range(3)]

# 画井字棋的格子
def draw_board():
    for i in range(0, 3):  # 画2条竖线
        pen.penup()
        pen.goto(-100 + i * 100, -150)
        pen.pendown()
        pen.goto(-100 + i * 100, 150)
    for i in range(0, 3):  # 画2条横线
        pen.penup()
        pen.goto(-150, -100 + i * 100)
        pen.pendown()
        pen.goto(150, -100 + i * 100)

# 在某个格子画 X 或 O
def draw_symbol(row, col, symbol):
    x = -150 + col * 100 + 50
    y = 150 - row * 100 - 90
    pen.penup()
    pen.goto(x, y)
    pen.write(symbol, align="center", font=("Arial", 36, "bold"))

# 处理点击事件
def click(x, y):
    global current_player
    # 将坐标转换为格子位置
    if not (-150 < x < 150 and -150 < y < 150):
        return
    col = int((x + 150) // 100)
    row = int((150 - y) // 100)
    if board[row][col] == "":
        board[row][col] = current_player
        draw_symbol(row, col, current_player)
        # 切换玩家
        current_player = "O" if current_player == "X" else "X"

# 运行程序
draw_board()
screen.onclick(click)
screen.mainloop()