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game.py
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game.py
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import numpy as np
import random
from copy import deepcopy
from numba import jitclass, int64, float32, float64
spec = [
("__size_board", int64),
("__seed", int64),
("__board", float64[:, :]),
("__total_score", int64),
("__merged", int64),
("__scores_move", int64),
("__temp_board", float64[:, :]),
("__valid_movements", float64[:]),
]
@jitclass(spec)
class Game2048:
"""Class responsible for game engine."""
def __init__(self, size_board, seed):
self.__size_board = size_board
self.__seed = seed
self.__board = self.__init_board()
self.__total_score = 0
self.__merged = 0
self.__scores_move = 0
self.__temp_board = np.zeros((size_board, size_board))
self.__valid_movements = np.zeros(4)
if self.__seed:
random.seed(self.__seed)
self.__add_two_or_four()
self.__add_two_or_four()
def __init_board(self):
return np.zeros((self.__size_board, self.__size_board))
def __get_empty_spaces_index(self):
# Return empty index
return np.where(self.__board == 0)
def __add_two_or_four(self):
"""Add number two or four in board"""
# Get avaliable index
indexes = self.__get_empty_spaces_index()
# Select one indec
index = np.random.choice(np.arange(len(indexes[0])))
# Select two or four
sample = np.random.rand(1)
if sample[0] >= 0.9:
self.__board[indexes[0][index]][indexes[1][index]] = 4
else:
self.__board[indexes[0][index]][indexes[1][index]] = 2
def __reverse_array(self, array):
temp_array = np.zeros(len(array))
for cell in range(len(array)):
temp_array[cell] = array[len(array) - cell - 1]
return temp_array
def __merge(self, array, reverse):
# Merges two cells in one by sum
# Get cells that are not zero
array = array[array != 0]
temp_array = np.zeros(self.__size_board)
if reverse:
count_index = self.__size_board - 1
else:
count_index = 0
i = 0
while True:
# Verify limits of board
if i >= (len(array) - 1):
if i == (len(array) - 1):
temp_array[count_index] = array[i]
return temp_array
# Verify if cells side by side is equal
if (array[i] == array[i + 1]) and array[i] != 0:
temp_array[count_index] = array[i] + array[i + 1]
self.__scores_move += temp_array[count_index]
self.__merged += 1
i = i + 2
if reverse:
count_index -= 1
else:
count_index += 1
else:
if array[i] != 0:
temp_array[count_index] = array[i]
if reverse:
count_index -= 1
else:
count_index += 1
i = i + 1
def __up(self):
self.__temp_board = np.zeros((self.__size_board, self.__size_board))
for column in range(self.__size_board):
self.__temp_board[:, column] = self.__merge(
self.__board[:, column].copy(), False
)
def __down(self):
self.__temp_board = np.zeros((self.__size_board, self.__size_board))
for column in range(self.__size_board):
self.__temp_board[:, column] = self.__merge(
self.__reverse_array(self.__board[:, column].copy()), True
)
def __right(self):
self.__temp_board = np.zeros((self.__size_board, self.__size_board))
for line in range(self.__size_board):
self.__temp_board[line, :] = self.__merge(
self.__reverse_array(self.__board[line, :].copy()), True
)
def __left(self):
self.__temp_board = np.zeros((self.__size_board, self.__size_board))
for line in range(self.__size_board):
self.__temp_board[line, :] = self.__merge(
self.__board[line, :].copy(), False
)
def __array_equal(self, a, b):
for value_a, value_b in zip(a.flat, b.flat):
if value_a != value_b:
return False
return True
def __check_available_moves(self):
"""Verify valid movements"""
self.__valid_movements = np.zeros(4)
for i in range(4):
self.make_move(i)
if self.__array_equal(self.__board, self.__temp_board) is False:
self.__valid_movements[i] = 1
def make_move(self, move):
"""Select one move"""
self.__merged = 0
self.__scores_move = 0
if move == 0:
self.__up()
if move == 1:
self.__down()
if move == 2:
self.__right()
if move == 3:
self.__left()
def confirm_move(self):
"""Execute movement and get info about merges and scores"""
self.__board = self.__temp_board.copy()
self.__total_score += self.__scores_move
returned_move_scores = self.__scores_move
returned_merged = self.__merged
self.__add_two_or_four()
self.__check_available_moves()
return returned_move_scores, returned_merged, self.__valid_movements
def get_board(self):
"""Return the board of the game."""
return self.__board
def get_total_score(self):
"""Return total score for this episode"""
return self.__total_score
def reset(self):
"""Reset game board and total score"""
self.__board = self.__init_board()
self.__total_score = 0
self.__add_two_or_four()
self.__add_two_or_four()
return self.get_board()