segmentation_renderer 1.0.2

A collection of painters to help render segmentation maps, which will help you visualize contours or bounding shapes on images.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:segmentation_renderer/lib.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Segmentation Renderer Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Segmentation Renderer Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: const Center(
          // Center is a layout widget. It takes a single child and positions it
          // in the middle of the parent.
          child: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          ImageWithContoursWithLoading(
            imagePath: "assets/test_image.jpeg",
            contoursPath: "assets/test_image_contours.txt",
          ),
          SizedBox(width: 20),
          ImageWithContoursWithLoading(
            imagePath: "assets/test_image2.jpeg",
            contoursPath: "assets/test_image2_contours.txt",
          ),
        ],
      )),
    );
  }
}

class ImageWithContoursWithLoading extends StatefulWidget {
  final String imagePath;
  final String contoursPath;
  const ImageWithContoursWithLoading(
      {super.key, required this.imagePath, required this.contoursPath});

  @override
  State<ImageWithContoursWithLoading> createState() =>
      _ImageWithContoursWithLoadingState();
}

class _ImageWithContoursWithLoadingState
    extends State<ImageWithContoursWithLoading> {
  List<Contour> contours = [];
  ValueNotifier<bool> isLoading = ValueNotifier(false);
  @override
  void initState() {
    Future.microtask(() async {
      isLoading.value = true;
      try {
        contours =
            await ContoursReader.readContoursFromAssetFile(widget.contoursPath);
      } catch (e) {
        print(e);
      }
      isLoading.value = false;
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<bool>(
      valueListenable: isLoading,
      builder: (context, value, child) {
        if (value) {
          return const CircularProgressIndicator();
        } else {
          return ImageWithContours(
            image: Image.asset(widget.imagePath),
            contours: contours,
            renderType: RenderType.boundingBox,
          );
        }
      },
    );
  }
}