gapspt

// Origin: https://github.com/ivanfratric/polypartition
// Commit: 5dcc93c9c023a2296610ec98539e2377f4285d30

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;

using tppl_float = System.Double;
using TPPLPolyList = System.Collections.Generic.LinkedList<TPPLPoly>;

gapspt

function addOverlayImage(url, scale) {
    let e = document.createElement('img');
    e.style.visibility = 'hidden';
    e.src = url;
    let w, h, r = 0;
    function setSize() {
        if (r) {
            let winR = window.innerWidth / window.innerHeight;
            let s = scale * (r > winR ? window.innerWidth / w : window.innerHeight / h);
            e.width = w * s;

gapspt

// Adapted from https://makandracards.com/makandra/46681-javascript-how-to-query-the-state-of-a-promise
function promiseState(promise, callback) {
  const uniqueValue = /unique/;
  Promise.race([promise, Promise.resolve(uniqueValue)])
    .then(
      (value) => callback(value === uniqueValue ? 'pending' : 'fulfilled'),
      (reason) => callback(`rejected (${reason})`));
}
function debugPromiseState(promise) {
  promiseState(promise, (state) => {