Method tick

src/core/core.animation.js:76–103

(date)

  }

  tick(date) {
    const elapsed = date - this._start;
    const duration = this._duration;
    const prop = this._prop;
    const from = this._from;
    const loop = this._loop;
    const to = this._to;
    let factor;

    this._active = from !== to && (loop || (elapsed < duration));

    if (!this._active) {
      this._target[prop] = to;
      this._notify(true);
      return;
    }

    if (elapsed < 0) {
      this._target[prop] = from;
      return;
    }

    factor = (elapsed / duration) % 2;
    factor = loop && factor > 1 ? 2 - factor : factor;
    factor = this._easing(Math.min(1, Math.max(0, factor)));

    this._target[prop] = this._fn(from, to, factor);
  }

  wait() {
    const promises = this._promises || (this._promises = []);