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https://github.com/kuhyx/WUT_Computer_Science.git
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244 lines
9.0 KiB
Python
244 lines
9.0 KiB
Python
import re
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"""
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Program that plays draughts (checkers) with user on 8x8 board using min-max with alpha-beta prunning
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"""
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class Game:
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"""Game"""
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def __init__(self, size):
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self.board_size = size
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self.white_positions = self.initialize_white()
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self.black_positions = self.initialize_black()
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# print(self.white_positions)
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# print(self.black_positions)
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def initialize_white(self):
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"""Initialize white pieces"""
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white_positions = []
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for y_coordinate in range(3):
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for x_coordinate in range(self.board_size):
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if y_coordinate % 2 == 0:
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if x_coordinate % 2 == 1:
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white_positions.append(
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(x_coordinate, y_coordinate, False))
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else:
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if x_coordinate % 2 == 0:
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white_positions.append(
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(x_coordinate, y_coordinate, False))
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return white_positions
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def initialize_black(self):
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"""Initialize black pieces"""
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black_positions = []
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for y_coordinate in range(self.board_size - 3, self.board_size):
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for x_coordinate in range(self.board_size):
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if y_coordinate % 2 == 0:
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if x_coordinate % 2 == 1:
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black_positions.append(
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(x_coordinate, y_coordinate, False))
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else:
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if x_coordinate % 2 == 0:
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black_positions.append(
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(x_coordinate, y_coordinate, False))
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return black_positions
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def check_move_out_of_bounds(self, from_, to):
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"""Check if the move destination is out of the bounds of the board"""
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if to[0] < 0 or to[0] >= self.board_size:
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print(
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f"Illegal move! Final x coordinate must be between 0 and {self.board_size-1}!")
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if to[1] < 0 or to[1] >= self.board_size:
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print(
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f"Illegal move! Final y coordinate must be between 0 and {self.board_size-1}!")
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return True
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return False
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def check_piece_exists(self, coords, color):
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"""Check if a piece of given color exists at a given spot"""
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if color == "white":
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if any(piece in self.white_positions for piece in ((*coords, False), (*coords, False))):
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return True
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else:
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if any(piece in self.black_positions for piece in ((*coords, False), (*coords, False))):
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return True
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return False
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def check_piece_king(self, coords, color):
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"""Check if a piece of in a given spot and of a given color is a king. Return false if no piece is found"""
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if color == "white":
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return (*coords, True) in self.white_positions
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else:
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return (*coords, True) in self.black_positions
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# https://stackoverflow.com/a/2191707
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def check_move_piece_capable(self, from_, to, color):
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"""Check if the move is exactly one square diagonally"""
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if abs(to[0] - from_[0]) == 1:
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if self.check_piece_king(from_, color):
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return True
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else:
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if color == "white":
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return to[1] == from_[1] + 1
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elif color == "black":
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return to[1] == from_[1] - 1
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return False
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def check_capture(self, from_, to, color):
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"""Check if a piece was captured for a given move. Return captured piece coordinates or None"""
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# captures can only happen if the player moved twice-diagonally
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if (abs(to[0]-from_[0]) != 2 or abs(to[1]-from_[1] != 2)):
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return None
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middle = (abs(to[0]-from_[0])//2, abs(to[1]-from_[1])//2)
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if color == "white" and self.check_piece_exists(middle, "black"):
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return middle
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elif color == "black" and self.check_piece_exists(middle, "white"):
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return middle
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return None
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def check_move_legal(self, from_, to, color):
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"""Check if a move is legal. Return a boolean or coordinates of captured piece"""
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if self.check_move_out_of_bounds(from_, to):
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print("Illegal move! Final position is out of the bounds of the board")
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return False
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if not self.check_piece_exists(from_, color):
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print(
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"Illegal move! There is no piece on the starting position that belongs to the player")
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return False
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if self.check_piece_exists(to, "white") or self.check_piece_exists(to, "black"):
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print("Illegal move! Cannot move to position taken by another piece")
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return False
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capture = self.check_capture(from_, to, color)
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if capture == None:
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if self.check_move_piece_capable(from_, to, color):
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return True
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else:
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print('Illegal move!')
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return False
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return capture
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def make_move(self, from_, to, color):
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"""Move a piece on the board and remove any captured pieces"""
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move_legal = self.check_move_legal(from_, to, color)
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if move_legal == False:
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return False
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capture = move_legal if type(move_legal) is tuple else None
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king = self.check_piece_king(from_, color)
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if (color == "white"):
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self.white_positions.remove((*from_, king))
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self.white_positions.append((*to, king))
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if (capture):
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captured_king = self.check_piece_king(capture, "black")
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self.black_positions.remove((*move_legal, captured_king))
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else:
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self.black_positions.remove((*from_, king))
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self.black_positions.append((*to, king))
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if (capture):
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captured_king = self.check_piece_king(capture, "white")
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self.white_positions.remove((*move_legal, captured_king))
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return True
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def print_board(self):
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"""Print the board in the console"""
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print(" ", end="")
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for x in range(self.board_size):
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print(f" {chr(ord('a')+x)} ", end="")
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print(" ")
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line = 0
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for y in range(self.board_size*4):
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for x in range(self.board_size):
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bg = "#" if x % 2 == (y//4) % 2 else " "
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checker = bg
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if ((x, y//4, False) in self.white_positions):
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checker = "w"
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elif ((x, y//4, True) in self.white_positions):
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checker = "W"
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elif ((x, y//4, False) in self.black_positions):
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checker = "b"
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elif ((x, y//4, True) in self.black_positions):
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checker = "B"
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if (x == 0):
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if (line % 4 == 2):
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print('{:3d}'.format(y//4), end="")
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else:
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print(" ", end="")
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match line % 4:
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case 0:
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print("+---", end="")
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case 1 | 3:
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print(f"|{3*bg}", end="")
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case 2:
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print(f"|{bg}{checker}{bg}", end="")
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if (line % 4 == 0):
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print("+")
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else:
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print(f"|{y//4}" if line % 4 == 2 else "|")
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line += 1
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print(" ", end="")
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for x in range(self.board_size):
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print("+---", end="")
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print("+\n ", end="")
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for x in range(self.board_size):
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print(f" {chr(ord('a')+x)}", end=" ")
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print()
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# Ran first in the code
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def get_possible_moves(color):
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# toDo: get possible moves for single piece, then iterate through all pieces
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# if color == "white":
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# for s
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pass
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def evaluate(self):
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white_score = 0
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black_score = 0
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for white_position in self.white_positions:
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if white_position[2]:
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white_score += 2
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else:
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white_score += 2
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for black_position in self.black_positions:
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if black_position[2]:
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black_score += 2
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else:
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black_score += 2
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return black_score - white_score
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def input_to_coordinates(self, input):
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pos_x = ord(input[0])-ord('a')
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pos_y = int(input[1::])
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return pos_x, pos_y
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def handle_player_move(self, color):
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has_moved = False
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while not has_moved:
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user_input = input('How do you want to move? (format: d6 e5)\n')
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regex = r"^[A-Za-z]\d+\s[A-Za-z]\d+$"
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match = re.search(regex, user_input)
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if not match:
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print('Invalid input, try again')
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continue
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[move_from, move_to] = user_input.split(' ')
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from_coordinates = self.input_to_coordinates(move_from)
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to_coordinates = self.input_to_coordinates(move_to)
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has_moved = self.make_move(
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from_coordinates, to_coordinates, color)
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self.print_board()
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if __name__ == "__main__":
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game = Game(8)
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game.print_board()
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game.handle_player_move('black')
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