ipycanvas - Game of Life

environment.yml

name: ipycanvas
channels:
  - conda-forge
dependencies:
  - branca
  - ipycanvas
  - voila

gol.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# John Conway's Game Of Life: Threaded Edition"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Some of the following code is adapted from https://jakevdp.github.io/blog/2013/08/07/conways-game-of-life/"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from time import sleep\n",
    "from threading import Thread\n",
    "\n",
    "import numpy as np\n",
    "\n",
    "from ipycanvas import MultiCanvas, hold_canvas"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def life_step(x):\n",
    "    \"\"\"Game of life step\"\"\"\n",
    "    nbrs_count = sum(np.roll(np.roll(x, i, 0), j, 1)\n",
    "                     for i in (-1, 0, 1) for j in (-1, 0, 1)\n",
    "                     if (i != 0 or j != 0))\n",
    "    return (nbrs_count == 3) | (x & (nbrs_count == 2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def draw(x, canvas, color='black'):\n",
    "    with hold_canvas(canvas):\n",
    "        canvas.clear()\n",
    "        canvas.fill_style = color\n",
    "\n",
    "        r = 0\n",
    "        for row in x:\n",
    "            c = 0\n",
    "            for value in row:\n",
    "                if value:\n",
    "                    canvas.fill_rect(r * n_pixels, c * n_pixels, n_pixels, n_pixels)\n",
    "\n",
    "                c += 1\n",
    "            r += 1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "glider_gun =\\\n",
    "[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0],\n",
    " [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0],\n",
    " [0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1],\n",
    " [0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1],\n",
    " [1,1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0],\n",
    " [1,1,0,0,0,0,0,0,0,0,1,0,0,0,1,0,1,1,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0],\n",
    " [0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0],\n",
    " [0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],\n",
    " [0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]\n",
    "\n",
    "x = np.zeros((50, 70), dtype=bool)\n",
    "x[1:10,1:37] = glider_gun"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "n_pixels = 10\n",
    "\n",
    "multi = MultiCanvas(2, size=(x.shape[1] * n_pixels, x.shape[0] * n_pixels))\n",
    "multi[0].fill_style = '#FFF0C9'\n",
    "multi[0].fill_rect(0, 0, multi.size[0], multi.size[1])\n",
    "\n",
    "multi"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "draw(x, multi[1], '#5770B3')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "class GameOfLife(Thread):\n",
    "    def __init__(self, x, canvas):\n",
    "        self.x = x\n",
    "        self.canvas = canvas\n",
    "        super(GameOfLife, self).__init__()\n",
    "\n",
    "    def run(self):\n",
    "        for _ in range(1_000):\n",
    "            self.x = life_step(self.x)\n",
    "            draw(self.x, self.canvas, '#5770B3')\n",
    "\n",
    "            sleep(0.1)\n",
    "\n",
    "GameOfLife(x, multi[1]).start()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### The game is now running in a separate thread, nothing stops you from changing the background color:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "multi[0].fill_style = '#D0FFB3'\n",
    "multi[0].fill_rect(0, 0, multi.size[0], multi.size[1])"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.7.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}

jupyter_config.json

{
    "VoilaConfiguration": {
        "enable_nbextensions": true
    }
}