radial_button 0.1.5

The purpose of Radial Button is facilitating the creation for FloatingActionButton and for the purpose that you need, using complete circle, semi-circle.

example/lib/main.dart

import 'package:flutter/material.dart';

import 'home_page.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutterando Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}