getSettings method

@override AnimationSettings getSettings(WidgetRestingEffects effects, AnimationController animationController)

Implementation

@override
AnimationSettings getSettings(
    WidgetRestingEffects effects, AnimationController animationController) {
  AnimationSettings _animationSettings =
      AnimationSettings(animationController: animationController);

  double effectStrength = effects.effectStrength!.clamp(0.3, 300);

  Random rnd = Random();
  int min = (-5 * effectStrength).toInt().clamp(-50, 50);
  int max = (5 * effectStrength).toInt().clamp(-50, 50);

  List<TweenSequenceItem<double>> xList = [];
  List<TweenSequenceItem<double>> yList = [];

  int iterations = (_getRandomNumber(3, 10, rnd)).toInt();
  double nextRandom = 0;
  double currentRandom = _getRandomNumber(min, max, rnd);

  xList.add(
    TweenSequenceItem<double>(
      tween: Tween<double>(begin: 0, end: currentRandom)
          .chain(CurveTween(curve: effects.curve!)),
      weight: 100 / (iterations + 2),
    ),
  );
  for (int i = 0; i < iterations; i++) {
    nextRandom = _getRandomNumber(min, max, rnd);
    xList.add(
      TweenSequenceItem<double>(
        tween: Tween<double>(begin: currentRandom, end: nextRandom)
            .chain(CurveTween(curve: effects.curve!)),
        weight: 100 / (iterations + 2),
      ),
    );
    currentRandom = nextRandom;
  }
  xList.add(
    TweenSequenceItem<double>(
      tween: Tween<double>(begin: currentRandom, end: 0)
          .chain(CurveTween(curve: effects.curve!)),
      weight: 100 / (iterations + 2),
    ),
  );

  iterations = (_getRandomNumber(3, 10, rnd)).toInt();
  nextRandom = 0;
  currentRandom = _getRandomNumber(min, max, rnd);
  yList.add(
    TweenSequenceItem<double>(
      tween: Tween<double>(begin: 0, end: currentRandom)
          .chain(CurveTween(curve: effects.curve!)),
      weight: 100 / (iterations + 2),
    ),
  );
  for (int i = 0; i < iterations; i++) {
    nextRandom = _getRandomNumber(min, max, rnd);
    yList.add(
      TweenSequenceItem<double>(
        tween: Tween<double>(begin: currentRandom, end: nextRandom)
            .chain(CurveTween(curve: effects.curve!)),
        weight: 100 / (iterations + 2),
      ),
    );
    currentRandom = nextRandom;
  }
  yList.add(
    TweenSequenceItem<double>(
      tween: Tween<double>(begin: currentRandom, end: 0)
          .chain(CurveTween(curve: effects.curve!)),
      weight: 100 / (iterations + 2),
    ),
  );

  _animationSettings.offsetXAnimation = TweenSequence<double>(
    <TweenSequenceItem<double>>[for (var x in xList) x],
  ).animate(
      CurvedAnimation(parent: animationController, curve: Curves.linear));

  _animationSettings.offsetYAnimation = TweenSequence<double>(
    <TweenSequenceItem<double>>[for (var y in yList) y],
  ).animate(
      CurvedAnimation(parent: animationController, curve: Curves.linear));

  return _animationSettings;
}