game_of_life.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2014-2023 Richard Hull and contributors
# See LICENSE.rst for details.
# PYTHON_ARGCOMPLETE_OK

"""
Conway's game of life.

Adapted from:
http://codereview.stackexchange.com/a/108121
"""

import time
from random import randint
from demo_opts import get_device
from luma.core.render import canvas


def neighbors(cell):
    x, y = cell
    yield x - 1, y - 1
    yield x, y - 1
    yield x + 1, y - 1
    yield x - 1, y
    yield x + 1, y
    yield x - 1, y + 1
    yield x, y + 1
    yield x + 1, y + 1


def iterate(board):
    new_board = set([])
    candidates = board.union(set(n for cell in board for n in neighbors(cell)))
    for cell in candidates:
        count = sum((n in board) for n in neighbors(cell))
        if count == 3 or (count == 2 and cell in board):
            new_board.add(cell)
    return new_board


def main():
    text = "Game of Life"
    scale = 3
    cols = device.width // scale
    rows = device.height // scale
    initial_population = int(cols * rows * 0.33)

    while True:
        board = set((randint(0, cols), randint(0, rows)) for _ in range(initial_population))

        for i in range(500):
            with canvas(device, dither=True) as draw:
                for x, y in board:
                    left = x * scale
                    top = y * scale
                    if scale == 1:
                        draw.point((left, top), fill="white")
                    else:
                        right = left + scale
                        bottom = top + scale
                        draw.rectangle((left, top, right, bottom), fill="white", outline="black")

                if i == 0:
                    left, top, right, bottom = draw.textbbox((0, 0), text)
                    w, h = right - left, bottom - top

                    left = (device.width - w) // 2
                    top = (device.height - h) // 2
                    draw.rectangle((left - 1, top, left + w + 1, top + h), fill="black", outline="white")
                    draw.text((left + 1, top), text=text, fill="white")

            if i == 0:
                time.sleep(3)

            board = iterate(board)


if __name__ == "__main__":
    try:
        device = get_device()
        main()
    except KeyboardInterrupt:
        pass