cam_frame_scanner 2.0.0

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:path/path.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.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();
    getPermission();
  }

  // get permission
  void getPermission() async {
    bool isCameraGranted = await Permission.camera.request().isGranted;
    if (!isCameraGranted) {
      isCameraGranted =
          await Permission.camera.request() == PermissionStatus.granted;
    }

    if (!isCameraGranted) {
      // Have not permission to camera
      return;
    }
  }

  Future<void> getImageFromCamera() async {
    bool isCameraGranted = await Permission.camera.request().isGranted;
    if (!isCameraGranted) {
      isCameraGranted =
          await Permission.camera.request() == PermissionStatus.granted;
    }

    if (!isCameraGranted) {
      // Have not permission to camera
      return;
    }

    // Generate filepath for saving
    String imagePath = join((await getApplicationSupportDirectory()).path,
        "${(DateTime.now().millisecondsSinceEpoch / 1000).round()}.jpeg");

    bool success = false;

    try {
      //Make sure to await the call to detectEdge.
      success = await EdgeDetection.detectEdge(
        imagePath,
        canUseGallery: true,
        androidScanTitle: 'Scanning', // use custom localizations for android
        androidCropTitle: 'Crop',
        androidCropBlackWhiteTitle: 'Black White',
        androidCropReset: 'Reset',
      );
      print("success: $success");
    } catch (e) {
      print(e);
    }

    // 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(() {
      if (success) {
        _imagePath = imagePath;
      }
    });
  }

  Future<void> getImageFromGallery() async {
    // Generate filepath for saving
    String imagePath = join((await getApplicationSupportDirectory()).path,
        "${(DateTime.now().millisecondsSinceEpoch / 1000).round()}.jpeg");

    bool success = false;
    try {
      //Make sure to await the call to detectEdgeFromGallery.
      success = await EdgeDetection.detectEdgeFromGallery(
        imagePath,
        androidCropTitle: 'Crop', // use custom localizations for android
        androidCropBlackWhiteTitle: 'Black White',
        androidCropReset: 'Reset',
      );
      print("success: $success");
    } catch (e) {
      print(e);
    }

    // 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(() {
      if (success) {
        _imagePath = imagePath;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Builder(builder: (context) {
        return Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: SingleChildScrollView(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Center(
                  child: ElevatedButton(
                    onPressed: getImageFromCamera,
                    child: Text('Scan'),
                  ),
                ),
                SizedBox(height: 20),
                Center(
                  child: ElevatedButton(
                    onPressed: getImageFromGallery,
                    child: Text('Upload'),
                  ),
                ),
                SizedBox(height: 20),
                Center(
                  child: ElevatedButton(
                    onPressed: () {
                      Navigator.push(
                        context,
                        MaterialPageRoute(
                          builder: (context) => const CameraView(),
                        ),
                      ).then((value) {
                        if (value != null) {
                          setState(() {
                            _imagePath = value as String;
                          });
                        }
                      });
                    },
                    child: Text('Scan with Widget'),
                  ),
                ),
                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 ?? ''),
                    ),
                  ),
                ),
              ],
            ),
          ),
        );
      }),
    );
  }
}

class CameraView extends StatefulWidget {
  const CameraView({Key? key}) : super(key: key);

  @override
  State<CameraView> createState() => _CameraViewState();
}

class _CameraViewState extends State<CameraView> {
  final EdgeDetectionCameraController _controller = EdgeDetectionCameraController();
  String? _savePath;

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

  Future<void> _initSavePath() async {
    final path = join((await getApplicationSupportDirectory()).path,
        "${(DateTime.now().millisecondsSinceEpoch / 1000).round()}.jpeg");
    setState(() {
      _savePath = path;
    });
  }

  @override
  Widget build(BuildContext context) {
    if (_savePath == null) return const Scaffold(body: Center(child: CircularProgressIndicator()));

    return Scaffold(
      appBar: AppBar(title: const Text('Edge Detection Camera')),
      body: Stack(
        children: [
          EdgeDetectionCamera(
            controller: _controller,
            saveTo: _savePath!,
            autoCapture: true,
            onCapture: (path) {
              print("Captured to: $path");
              Navigator.pop(context, path);
            },
            scanFrameBorderColor: "#19a55c",
            scanFrameBodyColor: "#44ccebda",
          ),
          Align(
            alignment: Alignment.bottomCenter,
            child: Padding(
              padding: const EdgeInsets.all(20.0),
              child: FloatingActionButton(
                onPressed: () => _controller.capture(),
                child: const Icon(Icons.camera_alt),
              ),
            ),
          ),
        ],
      ),
    );
  }
}