swift

[github]

the swift on an orange square, glinting now and then

logos 58×28 30 fps in colour or one ink 7.5 kB

use it

html

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

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

react

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

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

A client component, so it works in the Next.js app router as it is. Pass the name instead, piece="swift", 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="swift" 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 github:bas3line/ascii
import { mount } from "ascii.rest";
import { swift } from "ascii.rest/pieces";

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

swift.ts

[js] [github] 
/*
 * swift: the Swift logo, a swift on an orange square, with a glint crossing it
 * every few seconds.
 *
 * Drawn from devicon's swift-original.svg (MIT): 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 swift-plain.svg. The
 * logo is a trademark of its owner, shown here to name the language.
 */
import type { Frame, Meta } from "../types.ts";

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

export const meta = {
  name: "swift",
  category: "logos",
  note: "the swift on an orange square, glinting now and then",
  cols: 58,
  rows: 28,
  fps: 30,
  options: { shine: 5 },
  // The logo's 2 colours for a light page, then for a dark one; each as drawn, then twice lighter for the glint.
  palette: [
    "#f05138", "#fefefe", "#f58e7e", "#fefefe", "#fbcbc3", "#ffffff",
    "#f05138", "#fefefe", "#f58e7e", "#fefefe", "#fbcbc3", "#ffffff",
  ],
} satisfies Meta<SwiftOptions>;

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

       ._pppq8888888888888888888888888888888qqqq__
     _p88888888888888888888888888888888888888888888q,
   .p888888888888888888888888888888888888888888888888q
  .d88888888888888888888888888888888888888888888888888q
  q888888888888888888888888888888("88888888888888888888p
  88888888888888888888888888888888p "8888888888888888888
  888888888888888q)8888888888888888p  '88888888888888888
  8888888888q/88888_"888888888888888,   "888888888888888
  888888888888q'Y888q,"8888888888888b    '88888888888888
  88888888888888_ "Y88q,'"88888888888,     8888888888888
  888888888888888q_  "88_  "Y88888888:      888888888888
  88888888888888888q,   "b_   "888888       "88888888888
  8888888888888888888q,    '     "88P        88888888888
  888888888888888888888q_                    d8888888888
  88888888888888888888888q_                  d8888888888
  888888/8888888888888888888q,              .88888888888
  8888888q,""Y888888888888888P'              Y8888888888
  888888888q,   '"""""""""'                   "888888888
  88888888888q_,                               )88888888
  88888888888888qq_                   .___q__  '88888888
  888888888888888888qq___,       ___pp88888888q,88888888
  )8888888888888888888888888888888888888888888888888888P
   888888888888888888888888888888888888888888888888888P
    Y888888888888888888888888888888888888888888888888P
     'Y88888888888888888888888888888888888888888888P'
        '"Y88888888888888888888888888888888888PP"'

`;

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

       ._pppq8888888888888888888888888888888qqqq__
     _p88888888888888888888888888888888888888888888q,
   .p888888888888888888888888888888888888888888888888q
  .d88888888888888888888888888888888888888888888888888q
  q8888888888888888888888888888888888888888888888888888p
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  888888888888888888888888888888888888888888888888888888
  )8888888888888888888888888888888888888888888888888888P
   888888888888888888888888888888888888888888888888888P
    Y888888888888888888888888888888888888888888888888P
     'Y88888888888888888888888888888888888888888888P'
        '"Y88888888888888888888888888888888888PP"'

`;
const INK = String.raw`

       0000000000000000000000000000000000000000000
     000000000000000000000000000000000000000000000000
   000000000000000000000000000000000000000000000000000
  00000000000000000000000000000000000000000000000000000
  000000000000000000000000000000001000000000000000000000
  000000000000000000000000000000000110000000000000000000
  000000000000000000000000000000000011100000000000000000
  000000000001000001100000000000000011111000000000000000
  000000000000010000011000000000000001111100000000000000
  000000000000001110000111000000000001111110000000000000
  000000000000000011110011110000000001111111000000000000
  000000000000000000111110111110000001111111100000000000
  000000000000000000001111111111110001111111100000000000
  000000000000000000000011111111111111111111100000000000
  000000000000000000000000111111111111111111100000000000
  000000000000000000000000001111111111111111100000000000
  000000001110000000000000000011111111111111100000000000
  000000000011111111111111111111111111111111111000000000
  000000000000111111111111111111111111111111111000000000
  000000000000000111111111111111111111111111111100000000
  000000000000000000001111111111111100000000000100000000
  000000000000000000000000000000000000000000000000000000
   0000000000000000000000000000000000000000000000000000
    00000000000000000000000000000000000000000000000000
     000000000000000000000000000000000000000000000000
        000000000000000000000000000000000000000000

`;

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 swift({ shine = meta.options.shine }: Partial<SwiftOptions> = {}): 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");
  };
}