Flutter手写文字识别插件intl_script_recognizer的使用

intl_script_recognizer 是一个 Flutter 插件，用于在应用程序中识别手写文字。它支持多种语言的文字识别，并且可以处理不同语言的混合识别。以下是如何在 Flutter 项目中使用 intl_script_recognizer 的基本步骤：

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 intl_script_recognizer 依赖：

dependencies:
  flutter:
    sdk: flutter
  intl_script_recognizer: ^1.0.0  # 使用最新版本

然后运行 flutter pub get 来获取依赖。

2. 初始化识别器

在使用识别器之前，你需要先初始化它。通常，你可以在应用的 initState 方法中进行初始化。

import 'package:intl_script_recognizer/intl_script_recognizer.dart';

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late IntlScriptRecognizer _recognizer;

  [@override](/user/override)
  void initState() {
    super.initState();
    _recognizer = IntlScriptRecognizer();
    _recognizer.initialize();
  }

  [@override](/user/override)
  void dispose() {
    _recognizer.dispose();
    super.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Handwriting Recognition'),
        ),
        body: Center(
          child: Text('Handwriting Recognition Example'),
        ),
      ),
    );
  }
}

3. 捕获手写输入

你可以使用 Flutter 的 GestureDetector 或 Canvas 来捕获用户的手写输入。然后，将这些输入传递给 intl_script_recognizer 进行处理。

import 'package:flutter/material.dart';
import 'package:intl_script_recognizer/intl_script_recognizer.dart';

class HandwritingScreen extends StatefulWidget {
  [@override](/user/override)
  _HandwritingScreenState createState() => _HandwritingScreenState();
}

class _HandwritingScreenState extends State<HandwritingScreen> {
  late IntlScriptRecognizer _recognizer;
  List<Offset> points = [];

  [@override](/user/override)
  void initState() {
    super.initState();
    _recognizer = IntlScriptRecognizer();
    _recognizer.initialize();
  }

  [@override](/user/override)
  void dispose() {
    _recognizer.dispose();
    super.dispose();
  }

  void _onPanUpdate(DragUpdateDetails details) {
    setState(() {
      points = List.from(points)..add(details.localPosition);
    });
  }

  void _clearCanvas() {
    setState(() {
      points = [];
    });
  }

  Future<void> _recognizeText() async {
    if (points.isNotEmpty) {
      final recognizedText = await _recognizer.recognize(points);
      print('Recognized Text: $recognizedText');
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Handwriting Recognition'),
      ),
      body: Column(
        children: [
          Expanded(
            child: GestureDetector(
              onPanUpdate: _onPanUpdate,
              child: CustomPaint(
                painter: HandwritingPainter(points),
              ),
            ),
          ),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
              ElevatedButton(
                onPressed: _clearCanvas,
                child: Text('Clear'),
              ),
              ElevatedButton(
                onPressed: _recognizeText,
                child: Text('Recognize'),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

class HandwritingPainter extends CustomPainter {
  final List<Offset> points;

  HandwritingPainter(this.points);

  [@override](/user/override)
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.black
      ..strokeCap = StrokeCap.round
      ..strokeWidth = 4.0;

    for (int i = 0; i < points.length - 1; i++) {
      if (points[i] != null && points[i + 1] != null) {
        canvas.drawLine(points[i], points[i + 1], paint);
      }
    }
  }

  [@override](/user/override)
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return true;
  }
}