Disegnare in Flutter con flutter_drawing_board

flutter_drawing_board è un package per Flutter che ci consente di disegnare su schermo.

E' compatibile con tutte le piattaforme.

Per installarlo:

flutter pub add flutter_drawing_board

Qui sotto un esempio di codice:

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  final DrawingController _drawingController = DrawingController();

  Future<void> _getImageData() async {
    print((await _drawingController.getImageData())?.buffer.asInt8List());
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.primary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            SizedBox(
              width: 400,
              height: 400,
              child: DrawingBoard(
                controller: _drawingController,
                background: Container(
                  width: 400,
                  height: 400,
                  color: Colors.white,
                ),
                showDefaultActions: true,
                showDefaultTools: true,
              ),
            ),
            const Spacer(),
            FilledButton(
              onPressed: _getImageData,
              child: const Text('Premi'),
            ),
          ],
        ),
      ),
    );
  }
}

Ovviamente ci stanno diverse opzioni e possibili customizzazioni.

Enjoy!