pskink

class RotaryDial extends StatefulWidget {
  @override
  _RotaryDialState createState() => _RotaryDialState();
}

class _RotaryDialState extends State<RotaryDial> with SingleTickerProviderStateMixin {
  final numbers = List.generate(10, (i) => i != 0? 10 - i : i);
  final turns = ProxyAnimation();
  final stackKey = GlobalKey();
  late AnimationController controller;

pskink

import 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';

// sample code
/*
class CornerDecorationTest extends StatefulWidget {
  @override
  _CornerDecorationTestState createState() => _CornerDecorationTestState();
}