pop!_os

[github]

the p! in a teal circle, scanned now and then

distros 56×28 30 fps in colour or one ink 7.3 kB

use it

html

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

<ascii-art piece="pop-os" 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="pop-os" mono>, for one ink.

react

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

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

A client component, so it works in the Next.js app router as it is. Pass the name instead, piece="pop-os", 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="pop-os" 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 { popOs } from "ascii.rest/pieces";

const el = document.querySelector<HTMLCanvasElement>("canvas")!;
const stop = mount(el, popOs, {"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.

pop-os.ts

[js] [github] 
/*
 * pop!_os: the Pop!_OS logo, a p and a ! in a circle, with a scan line running
 * down it every few seconds that scrambles what it passes.
 *
 * Drawn from Simple Icons' popos.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 PopOsOptions {
  [key: string]: unknown;
  /** Seconds between scans; 0 keeps the logo still. */
  scan: number;
}

export const meta = {
  name: "pop!_os",
  category: "distros",
  note: "the p! in a teal circle, 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: [
    "#48b9c7", "#88d2db", "#c8eaee", "#48b9c7", "#88d2db", "#c8eaee",
  ],
} satisfies Meta<PopOsOptions>;

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

                  __pppq88888888qqqq__
              __p8888888888888888888888q_,
           _pp8888888888888888888888888888qq,
         _p88888888P""''""Y888888888888888888q,
       _p888888P"           "888888888888888888q,
      _888888"      __        "888888888888888888_
     q888888|      |888_       )888888888888888888p
    q8888888p       8888p      '8888888888888888888p
   q888888888q      "8888|      8888"    "Y888888888p
  .88888888888q      "888|     )888P      .8888888888,
  q888888888888q      '""     _8888|      p8888888888p
  88888888888888q,          _p88888'     p888888888888
  888888888888888q,      _pp8888888     p8888888888888
  8888888888888888q,     O888888888   .p88888888888888
  88888888888888888q,     888888888  _8888888888888888
  d888888888888888888,    "88888888_p8888888888888888P
  '8888888888888888888,    "8888888888888888888888888'
   )8888888888888888888p    88888"  8888888888888888(
    Y8888888888888888888q__p88888___d88888888888888P
     Y88888888888888888888888888888888888888888888P
      "8888888P                          )8888888"
       'Y88888p,                        .q88888P'
         'Y8888888888888888888888888888888888P'
           '"888888888888888888888888888888"'
              '"88888888888888888888888P"'
                  '""Y888888888888P""'

`;

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

                  __pppq88888888qqqq__
              __p8888888888888888888888q_,
           _pp8888888888888888888888888888qq,
         _p88888888P""''""Y888888888888888888q,
       _p888888P"           "888888888888888888q,
      _888888"      __        "888888888888888888_
     q888888|      |888_       )888888888888888888p
    q8888888p       8888p      '8888888888888888888p
   q888888888q      "8888|      8888"    "Y888888888p
  .88888888888q      "888|     )888P      .8888888888,
  q888888888888q      '""     _8888|      p8888888888p
  88888888888888q,          _p88888'     p888888888888
  888888888888888q,      _pp8888888     p8888888888888
  8888888888888888q,     O888888888   .p88888888888888
  88888888888888888q,     888888888  _8888888888888888
  d888888888888888888,    "88888888_p8888888888888888P
  '8888888888888888888,    "8888888888888888888888888'
   )8888888888888888888p    88888"  8888888888888888(
    Y8888888888888888888q__p88888___d88888888888888P
     Y88888888888888888888888888888888888888888888P
      "8888888P                          )8888888"
       'Y88888p,                        .q88888P'
         'Y8888888888888888888888888888888888P'
           '"888888888888888888888888888888"'
              '"88888888888888888888888P"'
                  '""Y888888888888P""'

`;
const INK = String.raw`

                  00000000000000000000
              0000000000000000000000000000
           0000000000000000000000000000000000
         00000000000000000000000000000000000000
       0000000000           000000000000000000000
      00000000      00        00000000000000000000
     00000000      00000       00000000000000000000
    000000000       00000      000000000000000000000
   00000000000      000000      00000    000000000000
  0000000000000      00000     00000      000000000000
  00000000000000      000     000000      000000000000
  0000000000000000          00000000     0000000000000
  00000000000000000      0000000000     00000000000000
  000000000000000000     0000000000   0000000000000000
  0000000000000000000     000000000  00000000000000000
  00000000000000000000    0000000000000000000000000000
  000000000000000000000    000000000000000000000000000
   000000000000000000000    000000  00000000000000000
    000000000000000000000000000000000000000000000000
     0000000000000000000000000000000000000000000000
      000000000                          000000000
       000000000                        000000000
         00000000000000000000000000000000000000
           0000000000000000000000000000000000
              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 popOs({ scan = meta.options.scan }: Partial<PopOsOptions> = {}): 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");
  };
}