animation method

@override List<AnimationController> animation()

Implementation

@override
List<AnimationController> animation() {
  List<AnimationController> controllers = [];
  for (int i = 0; i < 8; i++) {
    final controller = AnimationController(
        duration: const Duration(milliseconds: 500), vsync: context);
    final alphaTween = IntTween(begin: 255, end: 77).animate(controller);
    final scaleTween = Tween(begin: 1.0, end: 0.4).animate(controller);

    controller.addListener(() {
      scaleDoubles[i] = scaleTween.value;
      alphas[i] = alphaTween.value;
      postInvalidate();
    });
    controllers.add(controller);
  }
  return controllers;
}