Function startCreating

index.js:171–246

()

let metadataList = [];
// Create generative art by using the canvas api
const startCreating = async () => {
  console.log('##################');
  console.log('# Generative Art');
  console.log('# - Create your NFT collection');
  console.log('##################');

  console.log();
  console.log('start creating NFTs.')

  // clear meta data from previous run
  writeMetaData("");

  // prepare dnaList object
  rarityWeights.forEach((rarityWeight) => {
    dnaListByRarity[rarityWeight.value] = [];
  });

  // create NFTs from startEditionFrom to editionSize
  let editionCount = startEditionFrom;
  while (editionCount <= editionSize) {
    console.log('-----------------')
    console.log('creating NFT %d of %d', editionCount, editionSize);

    // get rarity from to config to create NFT as
    let rarity = getRarity(editionCount);
    console.log('- rarity: ' + rarity);

    // calculate the NFT dna by getting a random part for each layer/feature 
    // based on the ones available for the given rarity to use during generation
    let newDna = createDna(layers, rarity);
    while (!isDnaUnique(dnaListByRarity[rarity], newDna)) {
      // recalculate dna as this has been used before.
      console.log('found duplicate DNA ' + newDna.join('-') + ', recalculate...');
      newDna = createDna(layers, rarity);
    }
    console.log('- dna: ' + newDna.join('-'));

    // propagate information about required layer contained within config into a mapping object
    // = prepare for drawing
    let results = constructLayerToDna(newDna, layers, rarity);
    let loadedElements = [];

    // load all images to be used by canvas
    results.forEach((layer) => {
      loadedElements.push(loadLayerImg(layer));
    });

    // elements are loaded asynchronously
    // -> await for all to be available before drawing the image
    await Promise.all(loadedElements).then((elementArray) => {
      // create empty image
      ctx.clearRect(0, 0, width, height);
      // draw a random background color
      drawBackground();
      // store information about each layer to add it as meta information
      let attributesList = [];
      // draw each layer
      elementArray.forEach((element) => {