edge_detection 1.0.8

A flutter plugin to detect edges of objects, scan paper, detect corner, detect rectangle. It allows cropping of the detected object image and returns the path of the cropped image.

example/lib/main.dart

import 'dart:async';
import 'dart:io';

import 'package:edge_detection/edge_detection.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String? _imagePath;

  @override
  void initState() {
    super.initState();
  }

  Future<void> getImage() async {
    String? imagePath;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      imagePath = (await EdgeDetection.detectEdge);
      print("$imagePath");
    } on PlatformException catch (e) {
      imagePath = e.toString();
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _imagePath = imagePath;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Center(
                child: ElevatedButton(
                  onPressed: getImage,
                  child: Text('Scan'),
                ),
              ),
              SizedBox(height: 20),
              Text('Cropped image path:'),
              Padding(
                padding: const EdgeInsets.only(top: 0, left: 0, right: 0),
                child: Text(
                  _imagePath.toString(),
                  textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 14),
                ),
              ),
              Visibility(
                visible: _imagePath != null,
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Image.file(
                    File(_imagePath ?? ''),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}