greptile

[github]

the g folded into a cube, in green, glinting now and then

companies 49×28 30 fps in colour or one ink 6.2 kB [report a bug]

use it

html

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

<ascii-art piece="greptile" options='{"shine":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="greptile" mono>, for one ink.

react

// npm install ascii.rest
import { Ascii } from "ascii.rest/react";
import { greptile } from "ascii.rest/pieces";

<Ascii piece={greptile} options={{"shine":5}} />

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

astro

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

<Ascii piece="greptile" options={{"shine":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 ascii.rest
import { mount } from "ascii.rest";
import { greptile } from "ascii.rest/pieces";

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

terminal

npx ascii.rest greptile

Plays it in your terminal, in colour, until you press a key. Add --mono for the terminal's own colour. Add --light for a light terminal. Add --seconds 5 to stop it on its own; npx ascii.rest list shows every piece. In a CLI of your own, play("greptile", { seconds: 2 }) from ascii.rest/terminal shows it as a splash screen.

readme

<picture>
  <source media="(prefers-color-scheme: dark)" srcset="https://ascii.rest/svg/greptile.dark.svg">
  <img alt="greptile" src="https://ascii.rest/svg/greptile.svg" width="245">
</picture>
greptile, as a light README shows it
light, greptile.svg
greptile, as a dark README shows it
dark, greptile.dark.svg

An animated SVG that needs no script, so it plays in a GitHub README, which runs none. GitHub shows the dark one in its dark theme. It holds still for anyone who prefers reduced motion.

greptile.ts

[js] [github] 
/*
 * greptile: the Greptile logo, a G folded into an open cube, with a glint
 * crossing it every few seconds.
 *
 * Drawn from Greptile's own mark, from greptile.com: 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 colour, and a deeper
 * shade of it on a light page, where it would fade 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 company.
 */
import type { Frame, Meta } from "../types.ts";

export interface GreptileOptions {
  [key: string]: unknown;
  /** Seconds between glints; 0 keeps the logo still. */
  shine: number;
}

export const meta = {
  name: "greptile",
  category: "companies",
  note: "the g folded into a cube, in green, glinting now and then",
  cols: 49,
  rows: 28,
  fps: 30,
  options: { shine: 5 },
  // The logo's colour for a light page, then for a dark one; each as drawn, then twice lighter for the glint.
  palette: [
    "#11a96f", "#64c7a1", "#b8e5d4", "#28e99f", "#73f1c1", "#bff8e2",
  ],
} satisfies Meta<GreptileOptions>;

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

                       _pq_
                    ._88888q_
                  _p888888888q_
                _p888888888888P'
             ._8888888888888P' _88_,
           _p8888888888888" _p888888q,
         _p888888888888P" _p8888888888q,
      ._8888888888888P"   'O888888888888q_
    _p8888888888888P'       'Y888888888888q_
  \p8888888888888"            'Y888888888888q_
   "8888888888888q,           .p8888888888888P'
  8q,"8888888888888q,       _p8888888888888"'_p
  888q,'Y888888888888q_   _p8888888888888" _p88
  88888q,'Y888888888888qp8888888888888P" _p8888
  8888888q_'"88888888888888888888888"'_p8888888
  888888888q_ "888888888888888888P" _p888888888
  "8888888888q_ "88888888888888P" _p8888888888P
    'Y8888888888_ "8888888888"'.p88888888888"
      'Y8888888888q,"88888P" _p8888888888P"
         "8888888888q,'YP" _p8888888888P"
           "8888888888q, _88888888888P'
             "888888888| 8888888888"
               "8888888| 8888888P"
                 "88888| 88888P'
                   'Y88| 888"
                     'Y| P"

`;

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

                       _pq_
                    ._88888q_
                  _p888888888q_
                _p888888888888P'
             ._8888888888888P' _88_,
           _p8888888888888" _p888888q,
         _p888888888888P" _p8888888888q,
      ._8888888888888P"   'O888888888888q_
    _p8888888888888P'       'Y888888888888q_
  \p8888888888888"            'Y888888888888q_
   "8888888888888q,           .p8888888888888P'
  8q,"8888888888888q,       _p8888888888888"'_p
  888q,'Y888888888888q_   _p8888888888888" _p88
  88888q,'Y888888888888qp8888888888888P" _p8888
  8888888q_'"88888888888888888888888"'_p8888888
  888888888q_ "888888888888888888P" _p888888888
  "8888888888q_ "88888888888888P" _p8888888888P
    'Y8888888888_ "8888888888"'.p88888888888"
      'Y8888888888q,"88888P" _p8888888888P"
         "8888888888q,'YP" _p8888888888P"
           "8888888888q, _88888888888P'
             "888888888| 8888888888"
               "8888888| 8888888P"
                 "88888| 88888P'
                   'Y88| 888"
                     'Y| P"

`;
const INK = String.raw`

                       0000
                    000000000
                  0000000000000
                0000000000000000
             00000000000000000 00000
           0000000000000000 0000000000
         0000000000000000 00000000000000
      00000000000000000   0000000000000000
    00000000000000000       0000000000000000
  0000000000000000            0000000000000000
   0000000000000000           00000000000000000
  0000000000000000000       0000000000000000000
  000000000000000000000   0000000000000000 0000
  00000000000000000000000000000000000000 000000
  000000000000000000000000000000000000000000000
  00000000000 000000000000000000000 00000000000
  0000000000000 00000000000000000 0000000000000
    0000000000000 000000000000000000000000000
      0000000000000000000000 00000000000000
         00000000000000000 00000000000000
           0000000000000 00000000000000
             00000000000 00000000000
               000000000 000000000
                 0000000 0000000
                   00000 0000
                     000 00

`;

const START = 0.5; // seconds before the first glint
const PASS = 2; // seconds a glint takes to cross
const HALF = 5; // half its width, in cells
const LEAN = 0.9; // cells it shifts left a row down, so it leans like a slash
const SOLID = "8dbqpPYOo0"; // what the glint turns to slashes; thin edges keep their shape

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

export default function greptile({ shine = meta.options.shine }: Partial<GreptileOptions> = {}): Frame {
  const { cols, rows } = meta;
  const mono = lines(MONO), art = lines(ART), ink = lines(INK);
  const n = meta.palette.length / 6;
  const every = shine > 0 ? Math.max(shine, PASS + 0.5) : 0;
  // The glint crosses the logo's ink, edge to edge, rather than the whole frame.
  let lo = Infinity, hi = -Infinity;
  for (const pic of [mono, art])
    pic.forEach((line, y) => {
      for (let x = 0; x < cols; x++) if (line[x] !== " ") (lo = Math.min(lo, x + LEAN * y)), (hi = Math.max(hi, x + LEAN * y));
    });
  const span = hi - lo + 2 * HALF;

  return (t, { paper = false, color } = {}) => {
    const pic = color ? art : mono;
    const since = t - START;
    const at = every && since >= 0 ? lo - HALF + (span * (since % every)) / PASS : -Infinity;
    const out: string[] = [];
    for (let y = 0; y < rows; y++) {
      let line = "";
      for (let x = 0; x < cols; x++) {
        let ch = pic[y][x];
        if (ch !== " ") {
          const d = Math.abs(x + LEAN * y - at);
          let k = d < HALF ? 1 - d / HALF : 0;
          k = k * k * (3 - 2 * k);
          if (k > 0.55 && SOLID.includes(ch)) ch = "/";
          if (color) color[y * cols + x] = (paper ? 0 : 3 * n) + (k > 0.6 ? 2 : k > 0.25 ? 1 : 0) * n + parseInt(ink[y][x], 36);
        }
        line += ch;
      }
      out.push(line);
    }
    return out.join("\n");
  };
}