pubspec.yaml

name: singlepathpuzzle
description: SinglePathPuzzle

# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.8+9

environment:
  sdk: ">=2.17.3 <3.0.0"

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^2.0.15
  just_audio: ^0.9.25
  flutter_svg: ^1.1.0
  google_mobile_ads: ^1.3.0
  flutter_localizations:    #多言語ライブラリの本体
    sdk: flutter
  intl: ^0.17.0   #多言語やフォーマッタなどの関連ライブラリ
  package_info_plus: ^1.4.2

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.5

dev_dependencies:
  flutter_test:
    sdk: flutter

  flutter_launcher_icons: ^0.9.3
  flutter_native_splash: ^2.2.3+1

  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^2.0.1

flutter_icons:
  android: "launcher_icon"
  ios: true
  image_path: "assets/icon/icon.png"
  adaptive_icon_background: "assets/icon/icon_back.png"
  adaptive_icon_foreground: "assets/icon/icon_fore.png"

flutter_native_splash:
  color: '#ffcd40'
  image: 'assets/image/splash.png'
  color_dark: '#ffcd40'
  image_dark: 'assets/image/splash.png'
  fullscreen: true
  android_12:
    icon_background_color: '#ffcd40'
    image: 'assets/image/splash.png'
    icon_background_color_dark: '#ffcd40'
    image_dark: 'assets/image/splash.png'


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter packages.
flutter:
  assets:
    - assets/sound/
    - assets/icon/
    - assets/image/
  generate: true    #自動生成フラグの有効化

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

lib/main.dart

///
/// single path puzzle
///
/// @author akira ohmachi
/// @copyright ao-system, Inc.
/// @date 2022-06-20
/// @date 2022-06-26
///

import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:flutter_svg/svg.dart';
import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:just_audio/just_audio.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';
import 'dart:math';
import 'dart:async';
import 'dart:io';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp, //縦固定
  ]);
  MobileAds.instance.initialize();
  runApp(const MainApp());
}

class MainApp extends StatefulWidget {
  const MainApp({super.key});
  @override
  State<MainApp> createState() => _MainAppState();
}

class Pref {
  static const String keyDifficulty = "keyDifficulty";
  static const String keySound = "keySound";
  static const String keyLanguage = "keyLanguage";
}

class LanguageChoice {
  final Map<String,String> langMap = {
    'en': 'English',
    'bg': 'български език',
    'cs': 'Čeština',
    'da': 'dansk',
    'de': 'Deutsch',
    'el': 'Ελληνικά',
    'es': 'Español',
    'et': 'eesti keel',
    'fi': 'Suomen kieli',
    'fr': 'Français',
    'hu': 'magyar nyelv',
    'it': 'Italiano',
    'ja': '日本語',
    'lt': 'lietuvių kalba',
    'lv': 'Latviešu',
    'nl': 'Nederlands',
    'pl': 'Polski',
    'pt': 'Português',
    'ro': 'limba română',
    'ru': 'русский',
    'sk': 'Slovenčina',
    'sv': 'svenska',
    'th': 'ภาษาไทย',
    'zh': '中文',
  };
  List<String> languageList() {
    List<String> languages = [];
    langMap.forEach((key, value) {
      languages.add(key);
    });
    return languages;
  }
  String getLanguageName(String str) {
    if (langMap.containsKey(str)) {
      return langMap[str]!;
    }
    return '';
  }
  List<Locale> localeList() {
    List<Locale> locales = [];
    langMap.forEach((key, value) {
      locales.add(Locale(key));
    });
    return locales;
  }
}

class PieceWay {
  static const int nothing = -1;
  static const int plain = 0;
  static const int center = 1;
  static const int up = 2;
  static const int down = 3;
  static const int left = 4;
  static const int right = 5;
  static const int upDown = 6;
  static const int leftRight = 7;
  static const int upLeft = 8;
  static const int upRight = 9;
  static const int downLeft = 10;
  static const int downRight = 11;
}

class DifficultyLevel {
  static const List<int> levels = [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
}

class ColorDesign {
  static const Color appBackground = Color.fromARGB(255, 12, 20, 94);
  static const Color appHeader = Color.fromARGB(255, 21, 38, 168);
  static const Color appHeaderLine = Color.fromARGB(255, 53, 80, 209);
  static const Color appHeaderText = Color.fromARGB(255, 255, 255, 255);
  static const Color appBody = Color.fromARGB(255, 255, 255, 255);
  static const Color canvasClose = Color.fromARGB(255, 247, 247, 247);
  static const Color canvasOpen = Color.fromARGB(255, 16, 157, 62);
  static const Color pieceClose = Color.fromARGB(255, 32, 220, 95);
  static const Color pieceOpen = Color.fromARGB(255, 32, 220, 95);
  static const Color pieceLine = Color.fromARGB(255, 77, 51, 22);
  static const Color pieceLineSoil = Color.fromARGB(255, 114, 68, 26);
}

class RandomDouble {
  static final List<double> staticNum = [
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
    Random().nextDouble(),
  ];
}

class AudioPlay {
  static const int soundOff = 1;
  static const int soundOn = 2;
  final String _audioStart = 'assets/sound/start.mp3';
  final String _audioRetry = 'assets/sound/retry.mp3';
  final String _audioComplete = 'assets/sound/complete.mp3';
  final String _audioBack = 'assets/sound/back.mp3';
  final List<String> _audioForward = [
    'assets/sound/forward0.mp3',
    'assets/sound/forward1.mp3',
    'assets/sound/forward2.mp3',
    'assets/sound/forward3.mp3',
    'assets/sound/forward4.mp3',
    'assets/sound/forward5.mp3',
    'assets/sound/forward6.mp3',
    'assets/sound/forward7.mp3',
    'assets/sound/forward8.mp3',
    'assets/sound/forward9.mp3',
  ];
  static final List<AudioPlayer> _audioPlayerStart = [
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
  ];
  static final List<AudioPlayer> _audioPlayerRetry = [
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
  ];
  static final List<AudioPlayer> _audioPlayerComplete = [
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
  ];
  static final List<AudioPlayer> _audioPlayerBack = [
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
  ];
  static final List<AudioPlayer> _audioPlayerForward = [
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
    AudioPlayer(),
  ];
  int _sound = soundOn;
  int _audioPlayerStartPtr = 0;
  int _audioPlayerRetryPtr = 0;
  int _audioPlayerCompletePtr = 0;
  int _audioPlayerBackPtr = 0;
  int _audioPlayerForwardPtr = 0;
  AudioPlay() { //constructor
    constructor();
  }
  void constructor() async {
    for (int i = 0; i < _audioPlayerStart.length; i++) {
      await _audioPlayerStart[i].setAsset(_audioStart);
    }
    for (int i = 0; i < _audioPlayerRetry.length; i++) {
      await _audioPlayerRetry[i].setAsset(_audioRetry);
    }
    for (int i = 0; i < _audioPlayerComplete.length; i++) {
      await _audioPlayerComplete[i].setAsset(_audioComplete);
    }
    for (int i = 0; i < _audioPlayerBack.length; i++) {
      await _audioPlayerBack[i].setAsset(_audioBack);
    }
    for (int i = 0; i < _audioPlayerForward.length; i++) {
      await _audioPlayerForward[i].setAsset(_audioForward[i % 10]);
    }
  }
  void dispose() {
    for (int i = 0; i < _audioPlayerStart.length; i++) {
      _audioPlayerStart[i].dispose();
    }
    for (int i = 0; i < _audioPlayerRetry.length; i++) {
      _audioPlayerRetry[i].dispose();
    }
    for (int i = 0; i < _audioPlayerComplete.length; i++) {
      _audioPlayerComplete[i].dispose();
    }
    for (int i = 0; i < _audioPlayerBack.length; i++) {
      _audioPlayerBack[i].dispose();
    }
    for (int i = 0; i < _audioPlayerForward.length; i++) {
      _audioPlayerForward[i].dispose();
    }
  }
  void setSoundMode(int soundMode) {
    _sound = soundMode;
  }
  int getSoundMode() {
    return _sound;
  }
  String getSoundModeStr(dynamic context) {
    if (_sound == soundOff) {
      return AppLocalizations.of(context)!.off;
    } else if (_sound == soundOn) {
        return AppLocalizations.of(context)!.on;
    }
    return '';
  }
  void playSoundStart() async {
    if (_sound != soundOn) {
      return;
    }
    _audioPlayerStartPtr += 1;
    if (_audioPlayerStartPtr >= _audioPlayerStart.length) {
      _audioPlayerStartPtr = 0;
    }
    await _audioPlayerStart[_audioPlayerStartPtr].pause();
    await _audioPlayerStart[_audioPlayerStartPtr].seek(Duration.zero);
    await _audioPlayerStart[_audioPlayerStartPtr].play();
  }
  void playSoundRetry() async {
    if (_sound != soundOn) {
      return;
    }
    _audioPlayerRetryPtr += 1;
    if (_audioPlayerRetryPtr >= _audioPlayerRetry.length) {
      _audioPlayerRetryPtr = 0;
    }
    await _audioPlayerRetry[_audioPlayerRetryPtr].pause();
    await _audioPlayerRetry[_audioPlayerRetryPtr].seek(Duration.zero);
    await _audioPlayerRetry[_audioPlayerRetryPtr].play();
  }
  void playSoundComplete() async {
    if (_sound != soundOn) {
      return;
    }
    _audioPlayerCompletePtr += 1;
    if (_audioPlayerCompletePtr >= _audioPlayerComplete.length) {
      _audioPlayerCompletePtr = 0;
    }
    await _audioPlayerComplete[_audioPlayerCompletePtr].pause();
    await _audioPlayerComplete[_audioPlayerCompletePtr].seek(Duration.zero);
    await _audioPlayerComplete[_audioPlayerCompletePtr].play();
  }
  void playSoundBack() async {
    if (_sound != soundOn) {
      return;
    }
    _audioPlayerBackPtr += 1;
    if (_audioPlayerBackPtr >= _audioPlayerBack.length) {
      _audioPlayerBackPtr = 0;
    }
    await _audioPlayerBack[_audioPlayerBackPtr].pause();
    await _audioPlayerBack[_audioPlayerBackPtr].seek(Duration.zero);
    await _audioPlayerBack[_audioPlayerBackPtr].play();
  }
  void playSoundForward() async {
    if (_sound != soundOn) {
      return;
    }
    _audioPlayerForwardPtr += 1;
    if (_audioPlayerForwardPtr >= _audioPlayerForward.length) {
      _audioPlayerForwardPtr = 0;
    }
    await _audioPlayerForward[_audioPlayerForwardPtr].pause();
    await _audioPlayerForward[_audioPlayerForwardPtr].seek(Duration.zero);
    await _audioPlayerForward[_audioPlayerForwardPtr].play();
  }
}

class AppCondition {
  static const int ready = 0;
  static const int playing = 1;
  static const int complete = 2;
  static const int answering = 3;
  double _canvasWidth = 0;
  int _difficulty = 0;
  int _gameCondition = 0;
  AppCondition() { //constructor
    _gameCondition = ready;
  }
  double getCanvasWidth() {
    return _canvasWidth;
  }
  void setCanvasWidth(double w) {
    _canvasWidth = w;
  }
  int getDifficulty() {
    return _difficulty;
  }
  void setDifficulty(int n) {
    _difficulty = n;
  }
  int getGameCondition() {
    return _gameCondition;
  }
  void setGameCondition(int cond) {
    _gameCondition = cond;
  }
  Color stageColor() {
    if (_gameCondition == ready) {
      return ColorDesign.appBody;
    } else if (_gameCondition == playing) {
      return ColorDesign.canvasClose;
    } else if (_gameCondition == complete) {
      return ColorDesign.canvasOpen;
    }
    return ColorDesign.appBody;
  }
  Color bgColor() {
    if (_gameCondition == ready) {
      return ColorDesign.appBody;
    } else if (_gameCondition == playing) {
      return ColorDesign.appBody;
    } else if (_gameCondition == complete) {
      return ColorDesign.canvasOpen;
    }
    return ColorDesign.appBody;
  }
}

class MascotImage {
  static const String mole = 'assets/image/mole.svg';
  static const String left = 'assets/image/mole_left.svg';
  static const String right = 'assets/image/mole_right.svg';
  static const String up = 'assets/image/mole_up.svg';
  static const String down = 'assets/image/mole_down.svg';
  String getImageStr(int currentX, int currentY, int beforeX, int beforeY) {
    if (currentY < beforeY) {
      return up;
    } else if (currentY > beforeY) {
        return down;
    } else if (currentX > beforeX) {
      return right;
    } else if (currentX < beforeX) {
      return left;
    }
    return left;
  }
}

class AdMob {
  late BannerAd _adMobBanner;
  bool _isAdMob = false;
  AdMob() { //constructor
    String adBannerUnitId = '';
    if (!kIsWeb && Platform.isAndroid) {
      adBannerUnitId = 'ca-app-pub-0000000000000000/0000000000';
      _isAdMob = true;
    } else if (!kIsWeb && Platform.isIOS) {
      adBannerUnitId = 'ca-app-pub-0000000000000000/0000000000';
      _isAdMob = true;
    }
    if (_isAdMob) {
      _adMobBanner = BannerAd(
        adUnitId: adBannerUnitId,
        size: AdSize.banner,
        request: const AdRequest(),
        listener: const BannerAdListener(),
      );
    }
  }
  void load() {
    if (_isAdMob) {
      _adMobBanner.load();
    }
  }
  Widget getAdBannerWidget() {
    if (_isAdMob) {
      return Container(
        alignment: Alignment.center,
        width: _adMobBanner.size.width.toDouble(),
        height: _adMobBanner.size.height.toDouble(),
        child: AdWidget(ad: _adMobBanner),
      );
    } else {
      return Container(height: 150);
    }
  }
  double getAdBannerHeight() {
    if (_isAdMob) {
      return _adMobBanner.size.height.toDouble();
    } else {
      return 150;  //for web
    }
  }
}

//-------------------------------------------------

class _MainAppState extends State<MainApp> {
  Locale locale = AppLocalizations.supportedLocales.first;
  @override
  Widget build(BuildContext context) {
    final LanguageChoice languageChoice = LanguageChoice();
    final List<Locale> localeList = languageChoice.localeList();
    return MaterialApp(
      localizationsDelegates: const [
        AppLocalizations.delegate,
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: localeList,
      locale: locale,
      home: const MainPage(),
    );
  }
}

class MainPage extends StatefulWidget {
  const MainPage({Key? key}) : super(key: key);
  @override
  State<MainPage> createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  final GlobalKey<ScaffoldState> _key = GlobalKey<ScaffoldState>();
  String _version = '';
  List<int> _pieceState = []; //ピースの状態
  List<int> _pieceRoute = []; //問題制作時の道筋(回答例)
  List<int> _userRoute = [];  //ユーザー操作
  int _retryCount = 10; //リトライ数
  final AppCondition appCondition = AppCondition();
  final AdMob adMob = AdMob();
  final AudioPlay audioPlay = AudioPlay();
  final MascotImage mascotImage = MascotImage();
  @override
  void initState() {
    super.initState();
    getVersion();
    adMob.load();
  }
  @override
  void dispose() {
    audioPlay.dispose();
    super.dispose();
  }
  Future getVersion() async {
    PackageInfo packageInfo = await PackageInfo.fromPlatform();
    setState(() {
      _version = packageInfo.version;
    });
  }
  void getAppCanvasWidth() {
    SchedulerBinding.instance.addPostFrameCallback((_) {
      final double w = _key.currentContext!.size!.width - 16;
      final double h = _key.currentContext!.size!.height - 16 - 56 - adMob.getAdBannerHeight(); //56はheader高さ
      final double appWidth = (w < h) ? w : h;
      setState(() {
        appCondition.setCanvasWidth(appWidth);
      });
    });
  }
  void _clearPieceState() {
    _pieceState = [];
    for (int i = 0; i < appCondition.getDifficulty() * appCondition.getDifficulty(); i++) {
      _pieceState.add(PieceWay.nothing);
    }
    _userRoute = [];
  }
  void _loadLanguage() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    final String lang = prefs.getString(Pref.keyLanguage) ?? 'en';
    if (!mounted) {
      return;
    }
    context.findAncestorStateOfType<_MainAppState>()!
      ..locale = Locale(lang)
      ..setState(() {});
  }
  void _saveLanguage(String lang) async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    prefs.setString(Pref.keyLanguage, lang);
  }
  void _loadDifficulty() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    setState(() {
      appCondition.setDifficulty(prefs.getInt(Pref.keyDifficulty) ?? 5);
    });
    _clearPieceState();
  }
  void _saveDifficulty() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    setState(() {
      prefs.setInt(Pref.keyDifficulty, appCondition.getDifficulty());
    });
    _clearPieceState();
  }
  void _loadSound() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    setState(() {
      audioPlay.setSoundMode(prefs.getInt(Pref.keySound) ?? AudioPlay.soundOn);
    });
  }
  void _saveSound() async {
    final SharedPreferences prefs = await SharedPreferences.getInstance();
    setState(() {
      prefs.setInt(Pref.keySound, audioPlay.getSoundMode());
    });
  }
  void _onClickStartButton() {
    audioPlay.playSoundStart();
    appCondition.setGameCondition(AppCondition.playing);
    setState(() {
      _retryCount = 10;
      _clearPieceState();
      _makeWay();
    });
  }
  void _onClickRetryButton() {
    audioPlay.playSoundRetry();
    appCondition.setGameCondition(AppCondition.playing);
    final int startPos = _userRoute[0];
    _userRoute = [];
    _userRoute.add(startPos);
    for (int i = 0; i < _pieceState.length; i++) {
      if (_pieceState[i] != PieceWay.nothing) {
        _pieceState[i] = PieceWay.plain;
      }
    }
    _pieceState[startPos] = PieceWay.center;
    setState(() {
      _retryCount -= 1;
      if (_retryCount < 0) {
        _retryCount = 0;
      }
    });
  }
  void _onClickAnswerButton() {
    audioPlay.playSoundRetry();
    appCondition.setGameCondition(AppCondition.playing);
    final int startPos = _userRoute[0];
    _userRoute = [];
    _userRoute.add(startPos);
    for (int i = 0; i < _pieceState.length; i++) {
      if (_pieceState[i] != PieceWay.nothing) {
        _pieceState[i] = PieceWay.plain;
      }
    }
    _pieceState[startPos] = PieceWay.center;
    setState(() {});
    Timer(const Duration(milliseconds: 600), (){  //既に実行されているAnswerが停止するのを待つ
      appCondition.setGameCondition(AppCondition.answering);
      _answerRecursion(0);
    });
  }
  void _answerRecursion(int pieceRoutePtr) async {
    if (appCondition.getGameCondition() != AppCondition.answering) {
      return;
    }
    _pieceTouchAction(_pieceRoute[pieceRoutePtr]);
    if (pieceRoutePtr < _pieceRoute.length - 1) {
      Timer(const Duration(milliseconds: 500), (){_answerRecursion(pieceRoutePtr + 1);});
    }
  }

  //-----------------------------------------------

  void _makeWay() {
    final int difficulty = appCondition.getDifficulty();
    List<int> maxPieceRoute = [];
    for (int j = 0; j < 300; j++) {
      int currentPosition = Random().nextInt(difficulty * difficulty);
      _pieceRoute = [];
      _pieceRoute.add(currentPosition);
      for (int i = 0; i < 999; i++) {
        currentPosition = _nextPosition(currentPosition);
        if (currentPosition == -1) {
          break; //動けなくなった
        }
        _pieceRoute.add(currentPosition);
      }
      if (maxPieceRoute.length < _pieceRoute.length) {
        maxPieceRoute = [..._pieceRoute]; //最大長さを更新
      }
      if (maxPieceRoute.length > (difficulty * difficulty * 0.7)) {
        break;  //目標の長さを超えた
      }
    }
    _pieceRoute = [...maxPieceRoute]; //最大長さを採用
    for (int num in _pieceRoute) {
      _pieceState[num] = PieceWay.plain;
    }
    _userRoute.add(_pieceRoute[0]); //スタート地点
    _pieceState[_pieceRoute[0]] = PieceWay.center; //スタート地点
  }

  int _nextPosition(int currentPosition) {
    final int difficulty = appCondition.getDifficulty();
    List<int> movePossible = [];
    if (currentPosition - difficulty > 0 && _pieceRoute.contains(currentPosition - difficulty) == false) {
      movePossible.add(currentPosition - difficulty);  //上が可能
    }
    if (currentPosition + difficulty < difficulty * difficulty && _pieceRoute.contains(currentPosition + difficulty) == false) {
      movePossible.add(currentPosition + difficulty);  //下が可能
    }
    if (currentPosition % difficulty != 0 && _pieceRoute.contains(currentPosition - 1) == false) {
      movePossible.add(currentPosition - 1);  //左が可能
    }
    if ((currentPosition + 1) % difficulty != 0 && _pieceRoute.contains(currentPosition + 1) == false) {
      movePossible.add(currentPosition + 1);  //右が可能
    }
    if (movePossible.isEmpty) {
      return -1;  //end
    }
    movePossible.shuffle();
    return movePossible[0];
  }

  void _pieceTouchAction(int touchPos) {
    final int difficulty = appCondition.getDifficulty();
    if (_userRoute.length >= 2 && touchPos == _userRoute[_userRoute.length - 2]) {  //戻る
      setState(() {
        audioPlay.playSoundBack();
        _pieceState[_userRoute[_userRoute.length - 1]] = PieceWay.plain;
        _userRoute.removeLast();
      });
      return;
    }
    if (_pieceState[touchPos] != PieceWay.plain) {  //ルートが移動可能ではない
      return;
    }
    bool continuousFlag = false;
    if (_userRoute[_userRoute.length - 1] - difficulty == touchPos) {  //上へ移動
      continuousFlag = true;
    } else if (_userRoute[_userRoute.length - 1] + difficulty == touchPos) {  //下へ移動
      continuousFlag = true;
    } else if (_userRoute[_userRoute.length - 1] - 1 == touchPos) {  //左へ移動
      continuousFlag = true;
    } else if (_userRoute[_userRoute.length - 1] + 1 == touchPos) {  //右へ移動
      continuousFlag = true;
    }
    if (continuousFlag == false) {  //ルートの連続性が無い
      return;
    }
    final int lastTouchPos = _userRoute[_userRoute.length - 1];
    int last2TouchPos = -1;
    if (_userRoute.length >= 2) {
      last2TouchPos = _userRoute[_userRoute.length - 2];
    }
    _userRoute.add(touchPos);
    audioPlay.playSoundForward();
    setState(() {
      if (lastTouchPos - difficulty == touchPos) { //上に移動
        if (last2TouchPos == -1) {  //start位置
          _pieceState[lastTouchPos] = PieceWay.up;
        } else if (last2TouchPos - difficulty == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.upDown;
        } else if (last2TouchPos - 1 == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.upRight;
        } else if (last2TouchPos + 1 == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.upLeft;
        }
        _pieceState[touchPos] = PieceWay.down;
      } else if (lastTouchPos + difficulty == touchPos) { //下に移動
        if (last2TouchPos == -1) {  //start位置
          _pieceState[lastTouchPos] = PieceWay.down;
        } else if (last2TouchPos + difficulty == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.upDown;
        } else if (last2TouchPos - 1 == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.downRight;
        } else if (last2TouchPos + 1 == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.downLeft;
        }
        _pieceState[touchPos] = PieceWay.up;
      } else if (lastTouchPos - 1 == touchPos) { //左に移動
        if (last2TouchPos == -1) {  //start位置
          _pieceState[lastTouchPos] = PieceWay.left;
        } else if (last2TouchPos - 1 == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.leftRight;
        } else if (last2TouchPos + difficulty == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.upLeft;
        } else if (last2TouchPos - difficulty == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.downLeft;
        }
        _pieceState[touchPos] = PieceWay.right;
      } else if (lastTouchPos + 1 == touchPos) { //右に移動
        if (last2TouchPos == -1) {  //start位置
          _pieceState[lastTouchPos] = PieceWay.right;
        } else if (last2TouchPos + 1 == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.leftRight;
        } else if (last2TouchPos + difficulty == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.upRight;
        } else if (last2TouchPos - difficulty == lastTouchPos) {
          _pieceState[lastTouchPos] = PieceWay.downRight;
        }
        _pieceState[touchPos] = PieceWay.left;
      }
    });
    if (_userRoute.length == _pieceRoute.length) {
      audioPlay.playSoundComplete();
      appCondition.setGameCondition(AppCondition.complete);
    }
  }

  //-----------------------------------------------

  Widget _startButton() {
    return ElevatedButton(
      onPressed: _onClickStartButton,
      style: ElevatedButton.styleFrom(
        elevation: 0,
        primary: ColorDesign.appHeader,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(0.0)),
        side: const BorderSide(width: 0.5, color: ColorDesign.appHeaderLine),
        padding: const EdgeInsets.all(8.0),
      ),
      child: Text(AppLocalizations.of(context)!.start, style: const TextStyle(color: ColorDesign.appHeaderText)),
    );
  }
  Widget _retryButton() {
    if (appCondition.getGameCondition() == AppCondition.ready) {
      return Container();
    } else {
      final String retryString = _retryCount > 0 ? '${AppLocalizations.of(context)!.retry}: $_retryCount' : AppLocalizations.of(context)!.retry;
      return ElevatedButton(
        onPressed: _onClickRetryButton,
        style: ElevatedButton.styleFrom(
          elevation: 0,
          primary: ColorDesign.appHeader,
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(0.0)),
          side: const BorderSide(width: 0.5, color: ColorDesign.appHeaderLine),
          padding: const EdgeInsets.all(8.0),
        ),
        child: Text(retryString,
          style: const TextStyle(color: ColorDesign.appHeaderText),
        ),
      );
    }
  }
  Widget _answerButton() {
    if (_retryCount > 0) {
      return Container();
    } else {
      return ElevatedButton(
        onPressed: _onClickAnswerButton,
        style: ElevatedButton.styleFrom(
          elevation: 0,
          primary: ColorDesign.appHeader,
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(0.0)),
          side: const BorderSide(width: 0.5, color: ColorDesign.appHeaderLine),
          padding: const EdgeInsets.all(8.0),
        ),
        child: Text(AppLocalizations.of(context)!.answer,
          style: const TextStyle(
            color: ColorDesign.appHeaderText,
          ),
        ),
      );
    }
  }
  Widget _dialogDifficulty() {
    final int difficulty = appCondition.getDifficulty();
    return SimpleDialog(
      title: Text('${AppLocalizations.of(context)!.difficulty}: $difficulty'),
      children: List.generate(DifficultyLevel.levels.length,(index) {
        return SimpleDialogOption(
          child: Text(DifficultyLevel.levels[index].toString()),
          onPressed: () {
            setState(() {
              appCondition.setDifficulty(DifficultyLevel.levels[index]);
              appCondition.setGameCondition(AppCondition.ready);
            });
            _saveDifficulty();
            Navigator.pop(context);
          }
        );
      }),
    );
  }
  Widget _dialogSound() {
    return SimpleDialog(
      title: Text('${AppLocalizations.of(context)!.sound}: ${audioPlay.getSoundModeStr(context)}'),
      children: <Widget>[
        SimpleDialogOption(
            child: Text(AppLocalizations.of(context)!.off),
            onPressed: () {
              setState(() {
                audioPlay.setSoundMode(AudioPlay.soundOff);
              });
              _saveSound();
              Navigator.pop(context);
            }
        ),
        SimpleDialogOption(
            child: Text(AppLocalizations.of(context)!.on),
            onPressed: () {
              setState(() {
                audioPlay.setSoundMode(AudioPlay.soundOn);
              });
              _saveSound();
              Navigator.pop(context);
            }
        ),
      ],
    );
  }
  Widget _dialogLanguage() {
    final LanguageChoice languageChoice = LanguageChoice();
    final List<String> langList = languageChoice.languageList();
    return SimpleDialog(
      title: Text(AppLocalizations.of(context)!.language),
      children: List.generate(langList.length,(index) {
        return SimpleDialogOption(
          child: Row(
              children:[
                SizedBox(
                  width: 25,
                  child: Text(langList[index])
                ),
                Text('- ${languageChoice.getLanguageName(langList[index])}')
              ]
          ),
          onPressed: () {
            _saveLanguage(langList[index]);
            context.findAncestorStateOfType<_MainAppState>()!
              ..locale = Locale(langList[index])
              ..setState((){});
            Navigator.pop(context);
          }
        );
      }),
    );
  }
  Widget _hamburgerMenu() {
    final int difficulty = appCondition.getDifficulty();
    return Drawer(
      child: ListView(
        padding: EdgeInsets.zero,
        children: [
          SizedBox(
            height: 190,
            child: DrawerHeader(
              decoration: const BoxDecoration(color: Colors.blue),
              child: Column(children:[
                Row(children:[
                  SvgPicture.asset(MascotImage.mole, width: 80, height: 80),
                  const SizedBox(width: 8),
                  Flexible(child: Text(AppLocalizations.of(context)!.appName,style: const TextStyle(color: Colors.white))),
                ]),
                Text(AppLocalizations.of(context)!.usage,style: const TextStyle(fontSize: 11,color: Colors.white)),
              ]),
            )
          ),
          ListTile(
            leading: const CircleAvatar(
              child: Icon(
                Icons.flag,
              ),
            ),
            title: Text('${AppLocalizations.of(context)!.difficulty}: $difficulty'),
            trailing: const Icon(
              Icons.arrow_circle_right_outlined,
            ),
            onTap: () {
              showDialog(
                  context: context,
                  barrierDismissible: true,
                  builder: (_) {
                    return _dialogDifficulty();
                  }
              );
            },
          ),
          Container(
            padding: const EdgeInsets.only(left: 15,right: 15,bottom: 20),
            child: Text(AppLocalizations.of(context)!.difficulty1,style: const TextStyle(fontSize: 11,color: Colors.black54)),
          ),
          ListTile(
            leading: const CircleAvatar(
              child: Icon(
                Icons.audiotrack,
              ),
            ),
            title: Text('${AppLocalizations.of(context)!.sound}: ${audioPlay.getSoundModeStr(context)}'),
            trailing: const Icon(
              Icons.arrow_circle_right_outlined,
            ),
            onTap: () {
              showDialog(
                  context: context,
                  barrierDismissible: true,
                  builder: (_) {
                    return _dialogSound();
                  }
              );
            },
          ),
          Container(
            padding: const EdgeInsets.only(left: 15,right: 15,bottom: 20),
            child: Text(AppLocalizations.of(context)!.sound1,style: const TextStyle(fontSize: 11,color: Colors.black54)),
          ),
          ListTile(
            leading: const CircleAvatar(
              child: Icon(
                Icons.language,
              ),
            ),
            title: Text(AppLocalizations.of(context)!.language),
            trailing: const Icon(
              Icons.arrow_circle_right_outlined,
            ),
            onTap: () {
              showDialog(
                  context: context,
                  barrierDismissible: true,
                  builder: (_) {
                    return _dialogLanguage();
                  }
              );
            },
          ),
          Container(
            padding: const EdgeInsets.only(left: 15,right: 15,top: 50),
            child: Text('v $_version',style: const TextStyle(fontSize: 11,color: Colors.black45)),
          ),
        ],
      ),
    );
  }
  Widget _settingButton() {
    return IconButton(
      icon: const Icon(Icons.menu,color: ColorDesign.appHeaderText),
      tooltip: AppLocalizations.of(context)!.setting,
      onPressed: () {
        _key.currentState?.openDrawer();
      },
    );
  }
  Widget _menuBar() {
    final int difficulty = appCondition.getDifficulty();
    if (difficulty == 0) {  //アプリ起動初回のみ
      _loadDifficulty();
      _loadSound();
      _loadLanguage();
    }
    return Container(
      height: 56.0, // in logical pixels
      padding: const EdgeInsets.symmetric(horizontal: 8.0),
      decoration: const BoxDecoration(color: ColorDesign.appHeader),
      child: Row(
        children: <Widget> [
          _startButton(),
          const SizedBox(width: 8),
          _retryButton(),
          const SizedBox(width: 8),
          _answerButton(),
          const Expanded(
            child: SizedBox(width: 8),
          ),
          _settingButton(),
        ],
      ),
    );
  }
  Widget _boxCanvas() {
    final int difficulty = appCondition.getDifficulty();
    final double canvasWidth = appCondition.getCanvasWidth();
    if (appCondition.getGameCondition() == AppCondition.ready) {
      return InkWell(
        onTap: () {
          _onClickStartButton();
        },
        child: Center(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              SvgPicture.asset(MascotImage.mole, width: 200, height: 200),
            ]
          )
        )
      );
    }
    List<Widget> pieceWidget = <Widget>[];
    for (int y = 0; y < difficulty; y++) {
      for (int x = 0; x < difficulty; x++) {
        final int pieceStatePtr = y * difficulty + x;
        pieceWidget.add(
          CustomPaint(
            painter: _PiecePainter(canvasWidth, difficulty, x, y, _pieceState[pieceStatePtr]),
            child: Container(),
          )
        );
      }
    }
    void _pieceTouch(localPosition) {
      final int x = (localPosition.dx / (canvasWidth / difficulty)).floor();
      final int y = (localPosition.dy / (canvasWidth / difficulty)).floor();
      if (x < 0 || y < 0 || x >= difficulty || y >= difficulty) {
        return;
      }
      _pieceTouchAction(y * difficulty + x);
    }
    return GestureDetector(
      onTapDown: (details) {
        _pieceTouch(details.localPosition);
      },
      onPanUpdate: (details) {
        _pieceTouch(details.localPosition);
      },
      child: Stack(
          children: [
            Stack(children: pieceWidget),
            _mascot(),
          ]
      ),
    );
  }
  Widget _mascot() {
    final double canvasWidth = appCondition.getCanvasWidth();
    final int difficulty = appCondition.getDifficulty();
    final int currentRoutePosition = _userRoute.isEmpty ? _pieceRoute[0] : _userRoute[_userRoute.length - 1];
    final int currentRoutePositionX = currentRoutePosition % difficulty;
    final int currentRoutePositionY = (currentRoutePosition / difficulty).floor();
    final int beforeRoutePosition = (_userRoute.length < 2) ? _pieceRoute[0] : _userRoute[_userRoute.length - 2];
    final int beforeRoutePositionX = beforeRoutePosition % difficulty;
    final int beforeRoutePositionY = (beforeRoutePosition / difficulty).floor();
    final String mascotImgStr = mascotImage.getImageStr(currentRoutePositionX,currentRoutePositionY,beforeRoutePositionX,beforeRoutePositionY);
    final double imageW = canvasWidth / difficulty * 0.8;
    final double imageH = canvasWidth / difficulty * 0.8;
    final double marginLeft = (canvasWidth / difficulty) * currentRoutePositionX + (canvasWidth / difficulty * 0.1);
    final double marginTop = (canvasWidth / difficulty) * currentRoutePositionY + (canvasWidth / difficulty * 0.1);
    return Container(
      margin: EdgeInsets.only(left: marginLeft, top: marginTop),
      child: SvgPicture.asset(
        mascotImgStr,
        semanticsLabel: 'mascot',
        width: imageW,
        height: imageH,
      ),
    );
  }
  @override
  Widget build(BuildContext context) {
    getAppCanvasWidth();
    return Scaffold(
      key: _key,
      appBar: null,
      drawer: _hamburgerMenu(),
      backgroundColor: ColorDesign.appBackground,
      body: SafeArea(
        child: Center(
          child: Column(
            children: [
              _menuBar(),
              Expanded(
                child: Container(
                  color: appCondition.bgColor(),
                  padding: const EdgeInsets.symmetric(horizontal: 8.0,vertical: 8.0),
                  child: Center(
                    child: AspectRatio(
                      aspectRatio: 1 / 1,
                      child: AnimatedContainer(
                        duration: const Duration(milliseconds: 1000),
                        width: double.infinity,
                        height: double.infinity,
                        color: appCondition.stageColor(),
                        child: _boxCanvas(),
                      ),
                    ),
                  ),
                ),
              ),
              Container(
                width: double.infinity,
                color: appCondition.bgColor(),
                child: adMob.getAdBannerWidget(),
              ),
            ]
          ),
        ),
      ),
    );
  }
}

class _PiecePainter extends CustomPainter {
  final double canvasWidth;
  final int difficulty;
  final int x;
  final int y;
  final int direction;
  const _PiecePainter(this.canvasWidth,this.difficulty,this.x,this.y,this.direction);
  @override
  void paint(Canvas canvas, Size size) {
    if (direction == PieceWay.nothing) {
      return;
    }
    final double pieceWidth = canvasWidth / difficulty;
    final double pieceWidthHalf = pieceWidth / 2;
    const int pieceGap = 1;
    const int pieceGapDouble = pieceGap * 2;
    final double pieceLineWidth = pieceWidth / 3;
    final double pieceLineWidthHalf = pieceLineWidth / 2;
    final double piecePosX = x * pieceWidth;
    final double piecePosY = y * pieceWidth;
    if (direction == PieceWay.plain) {
      final paint = Paint()..color = ColorDesign.pieceClose;
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceGap, piecePosY + pieceGap, pieceWidth - pieceGapDouble , pieceWidth - pieceGapDouble), paint);
      return;
    }
    final paintPiece = Paint()..color = ColorDesign.pieceOpen;
    final paintLine = Paint()..color = ColorDesign.pieceLine;
    final paintLineSoil = Paint()..color = ColorDesign.pieceLineSoil;
    canvas.drawRect(Rect.fromLTWH(piecePosX + pieceGap, piecePosY + pieceGap, pieceWidth - pieceGapDouble , pieceWidth - pieceGapDouble), paintPiece);
    if (direction == PieceWay.center) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
    } else if (direction == PieceWay.up) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceGap, pieceLineWidth , pieceWidthHalf - pieceGap), paintLine);
    } else if (direction == PieceWay.down) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceWidthHalf, pieceLineWidth, pieceWidthHalf - pieceGap), paintLine);
    } else if (direction == PieceWay.left) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceGap, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidthHalf - pieceGap, pieceLineWidth), paintLine);
    } else if (direction == PieceWay.right) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidthHalf - pieceGap, pieceLineWidth), paintLine);
    } else if (direction == PieceWay.upDown) {
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceGap, pieceLineWidth , pieceWidth - pieceGapDouble), paintLine);
    } else if (direction == PieceWay.leftRight) {
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceGap, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidth - pieceGapDouble, pieceLineWidth), paintLine);
    } else if (direction == PieceWay.upLeft) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceGap, pieceLineWidth , pieceWidthHalf - pieceGap), paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceGap, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidthHalf - pieceGap, pieceLineWidth), paintLine);
    } else if (direction == PieceWay.upRight) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceGap, pieceLineWidth , pieceWidthHalf - pieceGap), paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidthHalf - pieceGap, pieceLineWidth), paintLine);
    } else if (direction == PieceWay.downLeft) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceWidthHalf, pieceLineWidth, pieceWidthHalf - pieceGap), paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceGap, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidthHalf - pieceGap, pieceLineWidth), paintLine);
    } else if (direction == PieceWay.downRight) {
      canvas.drawCircle(Offset(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf), pieceLineWidthHalf, paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf - pieceLineWidthHalf, piecePosY + pieceWidthHalf, pieceLineWidth, pieceWidthHalf - pieceGap), paintLine);
      canvas.drawRect(Rect.fromLTWH(piecePosX + pieceWidthHalf, piecePosY + pieceWidthHalf - pieceLineWidthHalf, pieceWidthHalf - pieceGap, pieceLineWidth), paintLine);
    }
    for (int i = 0; i < 3; i++) {
      final int pos = y * difficulty + x;
      final double rndNum1 = RandomDouble.staticNum[(i + pos) % RandomDouble.staticNum.length];
      final double rndNum2 = RandomDouble.staticNum[(i + pos + 1) % RandomDouble.staticNum.length];
      final double rndNum3 = RandomDouble.staticNum[(i + pos + 2) % RandomDouble.staticNum.length];
      final double soilX = piecePosX + pieceWidthHalf + ((rndNum1 - 0.5) * pieceWidth * 0.8);
      final double soilY = piecePosY + pieceWidthHalf + ((rndNum2 - 0.5) * pieceWidth * 0.8);
      final double soilR = (rndNum3 + 0.4) * pieceWidth * 0.03;
      canvas.drawCircle(Offset(soilX, soilY), soilR, paintLineSoil);
    }
  }
  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return true;
  }
}