large-grid.js

var neopixelWrite = require('ESP8266').neopixelWrite;
var count = 256;
var pixels = new Uint8Array(count * 3);
function update() {
  neopixelWrite(14, pixels);
}
function dampen(p) {
  var i = (p % count) * 3;
  pixels[i]>>>=1;
  pixels[++i]>>>=1;
  pixels[++i]>>>=1;
}
function rgb(p, r, g, b) {
  var i = (p % count) * 3;
  pixels[i] = g;
  pixels[++i] = r;
  pixels[++i] = b;
}
function hue(p, h, d) {
  h = (h + count) % 768;
  d = d || 0;
  if (h < 256) return rgb(p, h >> d, (255-h) >> d, 0);
  if (h < 512) return rgb(p, (511-h)>>d,0,(h-256)>>d);
  return rgb(p, 0, (h-512)>>d, (767-h)>>d);
}
function rand(x) {
  return Math.floor(Math.random() * x);
}
var bugs = [];
function Bug() {
  var x, y, h, l, d, p = 0;
  function init() {
    x = rand(16);
    y = rand(16);
    h = rand(768);
    l = rand(400);
    d = rand(4);
  }
  function update() {
    rgb(p, 0, 0, 0, 0);
    if (d === 0) x = (x + 1) % 16;
    else if (d === 1) y = (y + 1) % 16;
    else if (d === 2) x = (x + 15) % 16;
    else y = (y + 15) % 16;
    p = (y % 2 ? x : 15 - x) + y * 16;
    h =(h + 1) % 768;
    hue(p, h, 0);
    if ((l % 13) === 0) d = rand(4);
    if (!(--l)) {
      /*
      for (i = 1; i < 4; i++) {
        h += 27;
        var b = i * 2;
        hue(p + i, h, b);
        hue(p - i, h, b);
        hue(p + i * 16, h, b);
        hue(p - i * 16, h, b);
        h += 27;
        b++;
        hue(p + i * 17, h, b);
        hue(p + i * 15, h, b);
        hue(p - i * 17, h, b);
        hue(p - i * 15, h, b);
      }
      */
      init();
    }
  }
  init();
  bugs.push(update);
}

for (var i = 0; i < 10; i++) Bug();

var x = 0;
setInterval(function () {
  var i;
  // global dampen
  /*
  for (i = 0; i < count * 3; i++) {
    pixels[i] = (pixels[i] * 230) >> 8;
  }
  */
  for (i = 0; i < 4; i++) {
    x = (x + 1) % bugs.length;
    bugs[x]();
  }
  update();
}, 33);