https://bernhardfritz.github.io/p8g/editor/c165238765751acc81778b8615c47f19

sketch.js

import p8g, {
  background,
  createCanvas,
  height,
  line,
  noSmooth,
  random,
} from 'https://unpkg.com/p8g.js';

const gaps = [701, 301, 132, 57, 23, 10, 4, 1];

const shellSort = (a) => {
  const n = a.length;
  for (const gap of gaps) {
    for (let i = gap; i < n; i++) {
      const temp = a[i];
      let j;
      for (j = i; j > gap - 1 && a[j - 1] > temp; j -= gap) {
        a[j] = a[j - gap];
      }
      a[j] = temp;
    }  
  }
  return a;
};

const fisherYatesShuffle = (a) => {
  const n = a.length;
  for (let i = 0; i < n - 2; i++) {
    const j = Math.floor(random(i, n));
    [a[i], a[j]] = [a[j], a[i]];
  }
  return a;
};

function* makeIterator(fn, a) {
  const steps = [];
  const handler = {
    set(target, p, newValue) {
      steps.push([p, newValue]);
      target[p] = newValue;
      return true;
    },
  };
  const proxy = new Proxy([...a], handler);
  fn(proxy);
  for (const step of steps) {
    yield step;
  }
}

const n = 100;
const sorted = [...Array(n).keys()];
let it, a;
const init = () => {
  const unsorted = fisherYatesShuffle(sorted);
  it = makeIterator(shellSort, unsorted);
  a = [...unsorted];
};
init();

p8g.draw = () => {
  background(255);
  noSmooth();
  a.forEach((y, x) => {
    line(x, height, x, height - y);
  });
  const { value, done } = it.next();
  if (done) {
    init();
  } else {
    const [x, y] = value;
    a[x] = y;
  }
};

createCanvas(n, n);