gui_2.py

import sys
import threading
import tkinter as tk
from os import getenv
from os.path import abspath
from tkinter import messagebox
from typing import Callable, Dict

from PIL import Image, ImageTk

import chess

FEN = chess.STARTING_FEN
SELF_PLAY, COMPUTER_PLAY = 1, 2
THINK_TIME = int(getenv("THINK_TIME")) if getenv("THINK_TIME") else 1

sys.path.append(abspath('searcher'))

from searcher.elephantfish_2 import Searcher
from searcher.tools_2 import parseFEN, search, global_var_2


class ThinkThread(threading.Thread):
    def __init__(self, board: chess.Board, think_time: int, on_finish: Callable):
        threading.Thread.__init__(self)
        self.board = board
        self.think_time = think_time
        self.on_finish = on_finish

    def run(self):
        # 用self.board.fen()把整个棋盘描述出来
        pos = parseFEN(self.board.fen())  # pos存储了当前棋盘和棋盘子力价值
        move, _, _ = search(Searcher(), pos, THINK_TIME)

        from_square, to_square = move
        from_square = chess.SQUARES_180[from_square]
        to_square = chess.SQUARES_180[to_square]
        if self.board.turn == chess.BLACK:
            from_square = 255 - from_square - 1
            to_square = 255 - to_square - 1
        move = chess.Move(from_square, to_square)
        if self.on_finish:
            self.on_finish(move)

    def stop(self):
        self.on_finish = None


class PhotoImage(ImageTk.PhotoImage):
    @classmethod  # 用来指定一个类的方法为类方法，没有此参数指定的类的方法为实例方法
    def open(cls, fp):
        return cls(Image.open(fp))

    @classmethod
    def open_and_crop(cls, fp, x, y, w, h):
        im = Image.open(fp)
        im = im.crop((x, y, x + w, y + h))  # crop 图片截取
        return cls(im)


class Application(tk.Frame):
    # resources: Dict[str, PhotoImage]
    select_square: chess.Square = None
    board: chess.Board

    style = {"start_x": 15, "start_y": 45, "space_x": 60, "space_y": 60}
    rotate = False
    mode = COMPUTER_PLAY
    # mode = SELF_PLAY
    resources: Dict[str, PhotoImage] = {}  # 冒号后为类型注解

    def __init__(self) -> None:  # 箭头->后面注释了函数返回值的类型，这里None为不作要求
        self.computer_side = None
        self.options_frame = None
        self.canvas = None
        self.button0 = None
        self.button1 = None
        self.button2 = None
        self.button3 = None

        self.master = tk.Tk()  # 创建窗口
        super().__init__(self.master)  # 调用父类的 __init__ 方法
        self.load_resources()  # 加载图片
        self.master.title("中国象棋_2")
        self.master.resizable(False, False)  # 设置tkinter窗口大小不可拖拽调整
        self.pack()  # 规定布局，此处默认顶部对齐
        self.create_widgets()
        self.reset()
        if self.mode == COMPUTER_PLAY:
            self.computer_side = tk.BooleanVar(self)

    # 加载图片
    def load_resources(self):
        # self.resources = {}
        self.resources["bg"] = PhotoImage.open("./assets/board.png")
        self.resources["bg_r"] = PhotoImage.open("./assets/board_rotate.png")
        all_pieces = ["R", "N", "B", "A", "K", "C", "P", "r", "n", "b", "a", "k", "c", "p", "red_box", "blue_box"]
        for offset, piece in enumerate(all_pieces):
            self.resources[piece] = PhotoImage.open_and_crop("./assets/pieces.png", 0, offset * 60, 60, 60)
        self.resources["check"] = PhotoImage.open("./assets/check.png")
        self.resources["checkmate"] = PhotoImage.open("./assets/checkmate.png")

    # 创建交互窗口
    def create_widgets(self):
        self.canvas = tk.Canvas(self, bg="white", height=690, width=570, highlightthickness=0)
        # 将handle_click函数绑定到画布上 # "<B1-Motion>"是鼠标左键点击移动事件，"<Button-1>"是左键单击事件
        self.canvas.bind("<Button-1>", self.handle_click)
        # 将响应函数与对应按钮绑定
        self.button0 = tk.Button(self, text="翻转棋盘", command=self.rotate_board)
        self.button1 = tk.Button(self, text="悔棋", command=self.pop)
        self.button2 = tk.Button(self, text="自我对战", command=self.confirm_reset)
        self.button3 = tk.Button(self, text="人机对战", command=self.show_options)
        self.canvas.pack()
        self.button0.pack(side="left", pady=10)
        self.button1.pack(side="left", pady=10)
        self.button2.pack(side="left", pady=10)
        self.button3.pack(side="left", pady=10)

    def show_options(self):
        self.options_frame = tk.Toplevel(self, borderwidth=20)
        x = self.master.winfo_x()
        y = self.master.winfo_y()
        self.options_frame.geometry("+%d+%d" % (x + 200, y + 200))
        self.options_frame.resizable(False, False)
        self.computer_side = tk.BooleanVar(self)

        label = tk.Label(self.options_frame, text="电脑")
        label.grid(row=0, column=0)
        red_button = tk.Radiobutton(self.options_frame, text="红", variable=self.computer_side, value=chess.RED)
        red_button.grid(row=0, column=1)
        black_button = tk.Radiobutton(self.options_frame, text="黑", variable=self.computer_side, value=chess.BLACK)
        black_button.select()
        black_button.grid(row=0, column=2)
        start_button = tk.Button(self.options_frame, text="开始挑战", command=self.start_game)
        start_button.grid(row=1, column=0, columnspan=3)
        self.options_frame.update()

    def start_game(self) -> None:
        self.options_frame.destroy()
        self.mode = COMPUTER_PLAY
        self.reset()
        if self.computer_side.get() == chess.RED:
            self.rotate = True
            self.update_canvas()
            self.computer_move()

    def rotate_board(self) -> None:
        self.rotate = not self.rotate
        self.update_canvas()

    def confirm_reset(self) -> None:
        is_reset = messagebox.askokcancel(message="是否重新开始？")
        if not is_reset:
            return
        self.mode = SELF_PLAY
        self.reset()

    def reset(self):
        self.board = chess.Board(FEN)
        self.select_square = None
        self.update_canvas()

    def pop(self) -> None:
        if self.board.is_checkmate():
            return
        if self.mode == COMPUTER_PLAY and self.board.turn == self.computer_side.get():
            # 电脑思考时不能悔棋
            return
        if self.mode == COMPUTER_PLAY:
            self.board.pop()
        self.board.pop()
        self.select_square = None
        self.update_canvas()

    def computer_move(self) -> None:
        def on_finish(move):
            self.push(move)

        # 开设一个新的线程来进行AI预测,并调用on_finish移动棋子
        # 通过调用父类函数start(),激活当前ThinkThread类的run函数(已经对父类的run函数进行了覆盖)
        ThinkThread(self.board, 1, on_finish).start()

    def handle_click(self, event: tk.Event) -> None:
        if self.board.is_checkmate():
            return
        square = self.get_click_square(event.x, event.y)  # 确定点击的区域
        piece = self.board.piece_at(square)  # 获得当前点击的棋子实例对象

        # 确定当前场上是黑方回合还是白方回合
        if self.mode == SELF_PLAY:
            my_color = self.board.turn
        else:
            my_color = not self.computer_side.get()

        # 判断条件: ①当前点击区域有棋子②该棋子是本方颜色的棋子③当前轮到本方下棋
        if piece and self.board.color_at(square) == my_color and my_color == self.board.turn:
            self.select_square = square
            self.update_canvas()
        elif self.select_square:
            move = chess.Move(self.select_square, square)  # 确定移动前后坐标
            if move in self.board.legal_moves:  # 判断当前移动是否符合规则
                # 移动棋子,然后更改self.board.turn,让下面的COMPUTER_PLAY走棋
                self.push(move)
                if self.mode == COMPUTER_PLAY:
                    self.computer_move()

    def push(self, move: chess.Move):
        # print(self.board.chinese_move(move, full_width=True))  # 打印棋谱
        self.board.push(move)
        self.select_square = None
        self.update_canvas()
        if self.board.is_checkmate():
            self.update_canvas()
        elif self.board.is_check():
            self.update_canvas()
            check_image = self.canvas.create_image(0, 30, image=self.resources["check"], anchor="nw")

            def delete_check_image():
                self.canvas.delete(check_image)

            self.canvas.after(500, delete_check_image)

    def rotate_square(self, square: chess.Square) -> chess.Square:
        return 255 - square - 1

    def create_piece(self, piece: chess.Piece, square: chess.Square) -> None:
        if self.rotate:
            square = self.rotate_square(square)
        x = (
                self.style["start_x"]
                + (chess.square_file(chess.SQUARES_180[square]) - 3) * self.style["space_x"]
        )
        y = (
                self.style["start_y"]
                + (chess.square_rank(chess.SQUARES_180[square]) - 3) * self.style["space_y"]
        )
        self.canvas.create_image(x, y, image=self.resources[piece.symbol()], anchor="nw")

    def create_box(self, square: chess.Square, color="blue"):
        box = "blue_box" if color == "blue" else "red_box"
        if self.rotate:
            square = self.rotate_square(square)
        x = (self.style["start_x"]
             + (chess.square_file(chess.SQUARES_180[square]) - 3) * self.style["space_x"]
             )
        y = (self.style["start_y"]
             + (chess.square_rank(chess.SQUARES_180[square]) - 3) * self.style["space_y"]
             )
        self.canvas.create_image(x, y, image=self.resources[box], anchor="nw")

    def get_click_square(self, x: int, y: int) -> chess.Square:
        file = (x - self.style["start_x"]) // self.style["space_x"] + 3
        rank = (y - self.style["start_y"]) // self.style["space_y"] + 3
        square = chess.msb(chess.BB_FILES[file] & chess.BB_RANKS[rank])
        if self.rotate:
            return self.rotate_square(chess.SQUARES_180[square])
        return chess.SQUARES_180[square]

    def update_canvas(self):
        self.canvas.delete("all")
        if self.rotate:
            self.canvas.create_image(0, 0, image=self.resources["bg_r"], anchor="nw")
        else:
            self.canvas.create_image(0, 0, image=self.resources["bg"], anchor="nw")
        for square in chess.SQUARES_IN_BOARD:
            piece = self.board.piece_at(square)
            if piece:
                self.create_piece(piece, square)
        last_move = self.board.peek()

        if self.select_square:
            self.create_box(self.select_square, color="red")
            for move in filter(lambda x: x.from_square == self.select_square, self.board.legal_moves):
                self.create_box(move.to_square)

        elif last_move:
            self.create_box(last_move.from_square)
            self.create_box(last_move.to_square)

        if self.board.is_checkmate():
            self.canvas.create_image(0, 30, image=self.resources["checkmate"], anchor="nw")


if __name__ == "__main__":
    app = Application()
    app.mainloop()  # mainloop()方法允许程序循环执行，并进入等待和处理事件