Function getProgressData

esm/utils/paths.js:580–654

(rawPath, progress, decoratee, pushToNextIfAtEnd)

} // returns an object {path, segment, segIndex, i, t}

function getProgressData(rawPath, progress, decoratee, pushToNextIfAtEnd) {
  decoratee = decoratee || {};
  rawPath.totalLength || cacheRawPathMeasurements(rawPath);

  if (progress < 0 || progress > 1) {
    progress = _wrapProgress(progress);
  }

  var segIndex = 0,
      segment = rawPath[0],
      samples,
      resolution,
      length,
      min,
      max,
      i,
      t;

  if (!progress) {
    t = i = segIndex = 0;
    segment = rawPath[0];
  } else if (progress === 1) {
    t = 1;
    segIndex = rawPath.length - 1;
    segment = rawPath[segIndex];
    i = segment.length - 8;
  } else {
    if (rawPath.length > 1) {
      //speed optimization: most of the time, there's only one segment so skip the recursion.
      length = rawPath.totalLength * progress;
      max = i = 0;

      while ((max += rawPath[i++].totalLength) < length) {
        segIndex = i;
      }

      segment = rawPath[segIndex];
      min = max - segment.totalLength;
      progress = (length - min) / (max - min) || 0;
    }

    samples = segment.samples;
    resolution = segment.resolution; //how many samples per cubic bezier chunk

    length = segment.totalLength * progress;
    i = segment.lookup.length ? segment.lookup[~~(length / segment.minLength)] || 0 : _getSampleIndex(samples, length, progress);
    min = i ? samples[i - 1] : 0;
    max = samples[i];

    if (max < length) {
      min = max;
      max = samples[++i];
    }

    t = 1 / resolution * ((length - min) / (max - min) + i % resolution);
    i = ~~(i / resolution) * 6;

    if (pushToNextIfAtEnd && t === 1) {