void linux

[github]

the green ring, cut through, scanned now and then

distros 56×28 30 fps in colour or one ink 7.2 kB

use it

html

<script type="module" src="https://ascii.rest/ascii.js"></script>

<ascii-art piece="void-linux" options='{"scan":5}'></ascii-art>

No install and no build step. ascii.js defines the <ascii-art> tag, loads the piece from ascii.rest, plays it while it is on screen, and holds the first frame for anyone who prefers reduced motion. Add mono, <ascii-art piece="void-linux" mono>, for one ink.

react

// npm install github:bas3line/ascii
import { Ascii } from "ascii.rest/react";
import { voidLinux } from "ascii.rest/pieces";

<Ascii piece={voidLinux} options={{"scan":5}} />

A client component, so it works in the Next.js app router as it is. Pass the name instead, piece="void-linux", to fetch the piece only when it mounts. Add mono for one ink.

astro

---
// npm install github:bas3line/ascii
import Ascii from "ascii.rest/astro";
---

<Ascii piece="void-linux" options={{"scan":5}} />

Renders the first frame on the server, so the page is whole before any script runs, then plays the piece once it loads. Add mono for one ink.

typescript

// npm install github:bas3line/ascii
import { mount } from "ascii.rest";
import { voidLinux } from "ascii.rest/pieces";

const el = document.querySelector<HTMLCanvasElement>("canvas")!;
const stop = mount(el, voidLinux, {"scan":5});

mount plays a piece in a <pre>, or on a <canvas> for the coloured ones, and returns a function that stops it. Every piece, option and frame is typed. Mount it in a <pre> for one ink.

void-linux.ts

[js] [github] 
/*
 * void linux: the Void Linux logo, a ring cut through, with a scan line
 * running down it every few seconds that scrambles what it passes.
 *
 * Drawn from Simple Icons' voidlinux.svg (CC0): each cell holds the character
 * whose shape best matches the logo's edge through it, and 8 where the logo is
 * solid. On a canvas it takes the logo's colours, lifted on a dark page where
 * they would sink into it; in a <pre> it is one ink, from the same drawing.
 * The logo is a trademark of its owner, shown here to name the distribution.
 */
import type { Frame, Meta } from "../types.ts";

export interface VoidLinuxOptions {
  [key: string]: unknown;
  /** Seconds between scans; 0 keeps the logo still. */
  scan: number;
}

export const meta = {
  name: "void linux",
  category: "distros",
  note: "the green ring, cut through, scanned now and then",
  cols: 56,
  rows: 28,
  fps: 30,
  options: { scan: 5 },
  // The logo's colour for a light page, then for a dark one; each as drawn, then twice lighter for the scan.
  palette: [
    "#478061", "#87ac98", "#c8d9d0", "#478061", "#87ac98", "#c8d9d0",
  ],
} satisfies Meta<VoidLinuxOptions>;

// In a <pre>, in the page's own colour.
const MONO = String.raw`

                  __pppq88888888qqqq__
              __p8888888888888888888888q_,
             d8888888888888888888888888888qq,
              "888888888888888888888888888888q,
                "88888P""''''''""Y8888888888888q,
      __          ""                '"88888888888_
     q88q_                             "8888888888p
    q88888q_                             "888888888p
   )88888888P             .__,             O88888888p
  .88888888P          _pp888888qq,          O88888888,
  q88888888          p888888888888q          88888888p
  88888888P         q88888888888888p         )88888888
  88888888|        |8888888888888888,        |88888888
  88888888|        |8888888888888888|        |88888888
  88888888p         888888888888888P         q88888888
  d88888888,         Y888888888888P         .88888888P
  '88888888p          '"88888888"'          q88888888'
   )88888888q             ''''             d88888888"
    Y88888888q_                             "888888P
     Y888888888q_                             "888P
      "8888888888qq_                __          ""
       'Y888888888888qq__________pp888q_
         'Y88888888888888888888888888888q_
           '"88888888888888888888888888888b
              '"88888888888888888888888P"'
                  '""Y88888888888PP""'

`;

// On a canvas, and the colour of each cell: an index into the logo's colours.
const ART = String.raw`

                  __pppq88888888qqqq__
              __p8888888888888888888888q_,
             d8888888888888888888888888888qq,
              "888888888888888888888888888888q,
                "88888P""''''''""Y8888888888888q,
      __          ""                '"88888888888_
     q88q_                             "8888888888p
    q88888q_                             "888888888p
   )88888888P             .__,             O88888888p
  .88888888P          _pp888888qq,          O88888888,
  q88888888          p888888888888q          88888888p
  88888888P         q88888888888888p         )88888888
  88888888|        |8888888888888888,        |88888888
  88888888|        |8888888888888888|        |88888888
  88888888p         888888888888888P         q88888888
  d88888888,         Y888888888888P         .88888888P
  '88888888p          '"88888888"'          q88888888'
   )88888888q             ''''             d88888888"
    Y88888888q_                             "888888P
     Y888888888q_                             "888P
      "8888888888qq_                __          ""
       'Y888888888888qq__________pp888q_
         'Y88888888888888888888888888888q_
           '"88888888888888888888888888888b
              '"88888888888888888888888P"'
                  '""Y88888888888PP""'

`;
const INK = String.raw`

                  00000000000000000000
              0000000000000000000000000000
             00000000000000000000000000000000
              000000000000000000000000000000000
                000000000000000000000000000000000
      00          00                00000000000000
     00000                             000000000000
    00000000                             00000000000
   0000000000             0000             0000000000
  0000000000          000000000000          0000000000
  000000000          00000000000000          000000000
  000000000         0000000000000000         000000000
  000000000        000000000000000000        000000000
  000000000        000000000000000000        000000000
  000000000         0000000000000000         000000000
  0000000000         00000000000000         0000000000
  0000000000          000000000000          0000000000
   0000000000             0000             0000000000
    00000000000                             00000000
     000000000000                             00000
      00000000000000                00          00
       000000000000000000000000000000000
         000000000000000000000000000000000
           00000000000000000000000000000000
              0000000000000000000000000000
                  00000000000000000000

`;

const START = 0.5; // seconds before the first scan
const PASS = 2; // seconds a scan takes, top to bottom
const HEAD = 2; // rows the line scrambles
const TRAIL = 5; // rows of afterglow behind it
const NOISE = "#$%&*+<=>?@[]{}"; // what the line scrambles the logo into

const lines = (art: string) => art.slice(1, -1).split("\n").map((line) => line.padEnd(meta.cols));

function hash(x: number, y: number, k: number) {
  let h = Math.imul(x, 73856093) ^ Math.imul(y, 19349663) ^ Math.imul(k, 83492791);
  h = Math.imul(h ^ (h >>> 13), 1274126177);
  return (h ^ (h >>> 16)) >>> 0;
}

export default function voidLinux({ scan = meta.options.scan }: Partial<VoidLinuxOptions> = {}): Frame {
  const { cols, rows, fps } = meta;
  const mono = lines(MONO), art = lines(ART), ink = lines(INK);
  const n = meta.palette.length / 6;
  const every = scan > 0 ? Math.max(scan, PASS + 0.5) : 0;
  // The line runs from the logo's first row to past its last, rather than the whole frame.
  let first = rows, last = -1;
  for (const pic of [mono, art])
    pic.forEach((line, y) => {
      if (line.trim()) (first = Math.min(first, y)), (last = Math.max(last, y));
    });
  const span = last - first + 1 + HEAD + TRAIL;

  return (t, { paper = false, color } = {}) => {
    const pic = color ? art : mono;
    const since = t - START;
    const at = every && since >= 0 ? first + (span * (since % every)) / PASS : -Infinity;
    const tick = Math.floor((t * fps) / 2); // the noise changes every other frame
    const out: string[] = [];
    for (let y = 0; y < rows; y++) {
      const d = at - y; // rows since the line reached this one
      const level = d >= 0 && d < HEAD ? 2 : d >= HEAD && d < HEAD + TRAIL ? 1 : 0;
      let line = "";
      for (let x = 0; x < cols; x++) {
        let ch = pic[y][x];
        if (ch !== " ") {
          if (level === 2) {
            const h = hash(x, y, tick);
            if (h % 4) ch = NOISE[(h >>> 2) % NOISE.length];
          }
          if (color) color[y * cols + x] = (paper ? 0 : 3 * n) + level * n + parseInt(ink[y][x], 36);
        }
        line += ch;
      }
      out.push(line);
    }
    return out.join("\n");
  };
}