lottie-web/player/js/elements/helpers/shapes/ShapeTransformManager.js

After Effects plugin for exporting animations to SVG + JavaScript or canvas + JavaScript

import Matrix from '../../../3rd_party/transformation-matrix';

function ShapeTransformManager() {
  this.sequences = {};
  this.sequenceList = [];
  this.transform_key_count = 0;
}

ShapeTransformManager.prototype = {
  addTransformSequence: function (transforms) {
    var i;
    var len = transforms.length;
    var key = '_';
    for (i = 0; i < len; i += 1) {
      key += transforms[i].transform.key + '_';
    }
    var sequence = this.sequences[key];
    if (!sequence) {
      sequence = {
        transforms: [].concat(transforms),
        finalTransform: new Matrix(),
        _mdf: false,
      };
      this.sequences[key] = sequence;
      this.sequenceList.push(sequence);
    }
    return sequence;
  },
  processSequence: function (sequence, isFirstFrame) {
    var i = 0;
    var len = sequence.transforms.length;
    var _mdf = isFirstFrame;
    while (i < len && !isFirstFrame) {
      if (sequence.transforms[i].transform.mProps._mdf) {
        _mdf = true;
        break;
      }
      i += 1;
    }
    if (_mdf) {
      sequence.finalTransform.reset();
      for (i = len - 1; i >= 0; i -= 1) {
        sequence.finalTransform.multiply(sequence.transforms[i].transform.mProps.v);
      }
    }
    sequence._mdf = _mdf;
  },
  processSequences: function (isFirstFrame) {
    var i;
    var len = this.sequenceList.length;
    for (i = 0; i < len; i += 1) {
      this.processSequence(this.sequenceList[i], isFirstFrame);
    }
  },
  getNewKey: function () {
    this.transform_key_count += 1;
    return '_' + this.transform_key_count;
  },
};

export default ShapeTransformManager;