GameOfLife.cpp

//============================================================================
// Name        : Game.cpp
// Author      : Hasan Rasulov
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>
#include<random>
#include<array>
#include<SFML/Graphics.hpp>
using namespace std;

enum class State
	:size_t {
		dead = 0, alive = 1
};

constexpr size_t w = 600;
constexpr size_t h = 400;
constexpr size_t res = 5;
constexpr size_t cols = w / res;
constexpr size_t rows = h / res;
using Grid=array<array<State,rows>,cols>;

size_t get_count(Grid& grid, size_t x, size_t y) {

	size_t count = 0;

	for (int i = -1; i < 2; ++i)

		for (int j = -1; j < 2; j++)

			count += static_cast<size_t>(grid[(x + i + cols) % cols][(y + j
					+ rows) % rows]);

	count -= static_cast<size_t>(grid[x][y]);

	return count;
}

Grid generate(Grid& old_grid) {

	Grid new_grid;

	for (size_t i = 0; i < cols; ++i) {

		for (size_t j = 0; j < rows; j++) {

			size_t count_neighbours = get_count(old_grid, i, j);

			if (old_grid[i][j] == State::dead && count_neighbours == 3) {
				new_grid[i][j] = State::alive;
			} else if (old_grid[i][j] == State::alive
					&& (count_neighbours < 2 || count_neighbours > 3)) {
				new_grid[i][j] = State::dead;
			} else {
				new_grid[i][j] = old_grid[i][j];
			}

		}
	}

	return new_grid;
}

int main() {

	sf::RenderWindow window(sf::VideoMode(w, h), "Game of Life",
			sf::Style::Default);

	sf::RectangleShape zero(sf::Vector2f(res, res));
	zero.setFillColor(sf::Color::White);
	sf::RectangleShape one(sf::Vector2f(res, res));
	one.setFillColor(sf::Color::Black);

	Grid grid;

	std::random_device rd;
	mt19937 gen(rd());
	std::bernoulli_distribution dist(0.1);

	for (size_t i = 0; i < cols; ++i) {

		for (size_t j = 0; j < rows; j++) {

			grid[i][j] = dist(gen) ? State::alive : State::dead;

		}
	}

	while (window.isOpen()) {

		sf::Event e;

		while (window.pollEvent(e)) {

			if (e.type == sf::Event::Closed)
				window.close();

		}

		for (size_t i = 0; i < cols; ++i) {

			for (size_t j = 0; j < rows; j++) {

				if (grid[i][j] == State::alive) {

					one.setPosition(i * res, j * res);
					window.draw(one);

				} else {

					zero.setPosition(i * res, j * res);
					window.draw(zero);
				}

			}
		}

		grid = generate(grid);
		window.display();

	}

	return 0;
}