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趣味绘制 蒲丰投针试验
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-19
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+217
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‎README.md‎

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@@ -25,10 +25,10 @@
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> 当前Flutter 版本
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```
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Flutter 2.10.3 • channel stable • https://github.com/flutter/flutter.git
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Framework • revision 7e9793dee1 (4 weeks ago) • 2022-03-02 11:23:12 -0600
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Engine • revision bd539267b4
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Tools • Dart 2.16.1 • DevTools 2.9.2
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Flutter 2.10.5 • channel stable • https://github.com/flutter/flutter.git
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Framework • revision 5464c5bac7 (10 days ago) • 2022-04-18 09:55:37 -0700
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Engine • revision 57d3bac3dd
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Tools • Dart 2.16.2 • DevTools 2.9.2
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```
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---

‎lib/app/views/navigation/bloc_wrapper.dart‎

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@@ -42,17 +42,13 @@ class _BlocWrapperState extends State<BlocWrapper> {
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providers: [
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BlocProvider<GlobalBloc>(create: (_) => GlobalBloc(storage)..add(const EventInitApp())),
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BlocProvider<WidgetsBloc>(create: (_) => WidgetsBloc(repository: repository)),
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BlocProvider<WidgetDetailBloc>(
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create: (_) => WidgetDetailBloc(repository: repository)),
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BlocProvider<CategoryBloc>(
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create: (_) => categoryBloc),
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BlocProvider<LikeWidgetBloc>(
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create: (_) => LikeWidgetBloc(repository: repository)),
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BlocProvider<WidgetDetailBloc>(create: (_) => WidgetDetailBloc(repository: repository)),
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BlocProvider<CategoryBloc>(create: (_) => categoryBloc),
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BlocProvider<LikeWidgetBloc>(create: (_) => LikeWidgetBloc(repository: repository)),
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BlocProvider<RegisterBloc>(create: (_) => RegisterBloc()),
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BlocProvider<LoginBloc>(create: (_) => LoginBloc(authenticBloc: authBloc)),
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BlocProvider<AuthenticBloc>(create: (_) => authBloc),
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BlocProvider<CategoryWidgetBloc>(
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create: (_) => CategoryWidgetBloc(categoryBloc: categoryBloc)),
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BlocProvider<CategoryWidgetBloc>(create: (_) => CategoryWidgetBloc(categoryBloc: categoryBloc)),
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BlocProvider<PointBloc>(create: (_) => PointBloc()),
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BlocProvider<UpdateBloc>(create: (_) => UpdateBloc()),
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BlocProvider<GalleryUnitBloc>(create: (_) => GalleryUnitBloc()..loadGalleryInfo()),

‎lib/app/views/navigation/unit_navigation.dart‎

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@@ -108,7 +108,6 @@ class _UnitNavigationState extends State<UnitNavigation> {
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// 点击底部按钮事件，切换页面
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void _onTapBottomNav(int index) {
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// _controller.animateToPage(index, duration: const Duration(milliseconds: 200), curve: Curves.linear);
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_controller.jumpToPage(index);
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if(!isDark){

‎lib/painter_system/fun/bufeng/bufeng_panel.dart‎

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import 'package:flutter/material.dart';
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import 'painter.dart';
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import 'config.dart';
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class BufengPanel extends StatefulWidget {
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const BufengPanel({Key? key}) : super(key: key);
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@override
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State<BufengPanel> createState() => _BufengPanelState();
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}
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class _BufengPanelState extends State<BufengPanel> {
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final Config config = Config(
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size: const Size(200, 200),
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);
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void addNeedle({int count = 1}) {
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for (int i = 0; i < count; i++) {
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config.addNeedle();
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}
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}
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@override
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Widget build(BuildContext context) {
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return Stack(
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alignment: Alignment.topCenter,
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children: [
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Padding(
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padding: EdgeInsets.only(top: 10),
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child: CustomPaint(
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painter: PiPainter(config),
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size: config.size,
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),
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),
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Positioned(
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right: 0,
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top: 10,
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child: Row(
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children: [
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IconButton(onPressed: addNeedle, icon: const Icon(Icons.add)),
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IconButton(onPressed: () => addNeedle(count: 100), icon: const Icon(Icons.add_chart)),
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IconButton(onPressed: config.clear, icon: const Icon(Icons.refresh)),
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],
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),
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)
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],
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);
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// Scaffold(
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// appBar: AppBar(
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// title: const Text('蒲丰投针试验'),
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// actions:
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// [
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// IconButton(onPressed: addNeedle, icon: const Icon(Icons.add)),
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// IconButton(onPressed: () => addNeedle(count: 100), icon: const Icon(Icons.add_chart)),
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// IconButton(onPressed: config.clear, icon: const Icon(Icons.refresh)),
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// ],
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// ),
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// body: Center(
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// child: ,
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// ),
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// );
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}
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}

‎lib/painter_system/fun/bufeng/config.dart‎

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import 'dart:math';
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import 'package:flutter/cupertino.dart';
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class Line {
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final Offset p0;
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final Offset p1;
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Line({
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required this.p0,
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required this.p1,
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});
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bool isActive(double gap) {
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int gapIndex0 = p0.dy ~/ gap;
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int gapIndex1 = p1.dy < 0 ? -1 : p1.dy ~/ gap;
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return gapIndex0 != gapIndex1 ||
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p0.dy % gap < 0.000000001 ||
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p1.dy % gap < 0.000000001;
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}
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}
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class Config extends ChangeNotifier {
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int lineCount;
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Size size;
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List<Line> lines = [];
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Config({
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this.lineCount = 8,
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this.size = const Size(200, 200),
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});
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double get gap => size.height / lineCount;
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@override
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String toString() {
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int n = lines.length;
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int m = lines.where((line) => line.isActive(gap)).length;
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double parserPi = m == 0 ? 0 : 2 * n / m;
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return '投针个数: ${lines.length}\n命中个数: $m \n'
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'估算圆周率 : $parserPi';
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}
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void addNeedle() {
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Line line = _createNeedle();
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lines.add(line);
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notifyListeners();
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}
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final Random _random = Random();
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Line _createNeedle() {
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double x = _random.nextDouble() * size.width;
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double y = _random.nextDouble() * size.height;
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double rad = 2 * pi * _random.nextDouble();
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double dx = gap * cos(rad);
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double dy = gap * sin(rad);
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Line line = Line(p0: Offset(x, y), p1: Offset(x + dx, y + dy));
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return line;
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}
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void clear() {
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lines.clear();
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notifyListeners();
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}
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}

‎lib/painter_system/fun/bufeng/painter.dart‎

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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'config.dart';
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class PiPainter extends CustomPainter {
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final Config config;
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PiPainter(this.config) : super(repaint: config);
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@override
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void paint(Canvas canvas, Size size) {
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print(size);
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Paint paint = Paint();
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paint.style = PaintingStyle.stroke;
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final double span = config.gap;
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drawHelpText(
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'$config',
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canvas,
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Offset.zero,
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);
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canvas.translate(0, size.height*0.3);
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canvas.save();
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for (int i = 0; i <= config.lineCount; i++) {
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canvas.drawLine(Offset.zero, Offset(size.width, 0), paint);
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print(span*i);
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canvas.translate(0, span);
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}
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canvas.restore();
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Paint needlePaint = Paint();
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needlePaint.style = PaintingStyle.stroke;
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needlePaint.strokeWidth = 1;
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for (Line line in config.lines) {
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if (line.isActive(config.gap)) {
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needlePaint.color = Colors.red;
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} else {
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needlePaint.color = Colors.green;
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}
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canvas.drawLine(line.p0, line.p1, needlePaint);
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}
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}
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@override
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bool shouldRepaint(covariant PiPainter oldDelegate) {
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return config != oldDelegate.config;
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}
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final TextPainter textPainter = TextPainter(
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textAlign: TextAlign.start,
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textDirection: TextDirection.ltr,
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);
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void drawHelpText(
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String text,
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Canvas canvas,
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Offset offset, {
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Color color = Colors.lightBlue,
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}) {
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textPainter.text = TextSpan(
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text: text,
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style: TextStyle(fontSize: 14, color: color),
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);
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textPainter.layout(maxWidth: 250);
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textPainter.paint(canvas, offset);
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}
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}

‎lib/painter_system/gallery_factory.dart‎

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@@ -22,6 +22,7 @@ import 'base/draw_picture.dart';
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import 'base/n_side/n_side_page.dart';
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import 'base/polar/polar_painter_widget.dart';
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import 'fun/bufeng/bufeng_panel.dart';
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import 'fun/dundun_view.dart';
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import 'fun/random_portrait.dart';
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import 'fun/stemp/stamp_paper.dart';
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srcUrl: '/fun/dundun_view.dart',
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info: "本样例是绘制 2022 年北京冬奥会吉祥物冰墩墩的形体，从中可以学到路径绘制、渐变色等知识。",
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content: DunDunView()),
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FrameShower(
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title: "蒲丰投针试验",
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author: "张风捷特烈",
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srcUrl: '/fun/bufeng',
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info: "本样实现蒲丰投针试验的测试过程，根据概率来估算圆周率。其中可以学习到一些绘制小技巧已经数据的逻辑处理。",
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content: BufengPanel()),
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FrameShower(
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title: "井字棋",
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author: "张风捷特烈",

‎lib/widget_system/widgets/StatefulWidget/AppBar/node2_tab.dart‎

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super.dispose();
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}
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// decoration: const BoxDecoration(
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// image: DecorationImage(
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// image: AssetImage(
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// "assets/images/sabar.webp",
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// ),
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// fit: BoxFit.cover))
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@override
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Widget build(BuildContext context) {
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return SizedBox(

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