trackoffical_app/lib/service/game/show_position_controller.dart

import 'package:flutter/animation.dart';
import 'package:get/get.dart';

class ShowPositionController extends GetxController  with GetSingleTickerProviderStateMixin{
  AnimationController? controller;
  Animation<double>? animation;
  final alpha = 0.obs;

  ShowPositionController(){
    controller = AnimationController(
        duration: const Duration(milliseconds: 5000), vsync: this);

    final sequence = TweenSequence<double>([
      TweenSequenceItem(tween: ConstantTween(255), weight: 3),
      TweenSequenceItem(tween: Tween(begin: 255, end: 0), weight: 2)
    ]);

    animation = sequence.animate(controller!)
      ..addListener(() { alpha.value = animation!.value.toInt(); });

  }


  show(){
    controller?.reset();
    controller?.forward();
  }

}