radial_slider 0.0.2

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  • Changelog
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radial_slider #

A radial slider widget.

Getting Started #

For help getting started with Flutter, view our online documentation.

For help on editing package code, view the documentation.

[0.0.1] - TODO: Add release date.

  • TODO: Describe initial release.


import 'dart:math';
import 'package:flutter/material.dart';
import 'package:radial_slider/radial_slider.dart';

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

class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
        accentColor: Colors.red,
        brightness: Brightness.light,
      home: Scaffold(
          appBar: AppBar(
            title: Text('Flutter Demo')
          body: AppBody(),

const double START_ANGLE = - pi / 2;

class AppBody extends StatefulWidget {
  _AppBodyState createState() => _AppBodyState();

class _AppBodyState extends State<AppBody> {
  double angle = START_ANGLE;

  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
          height: 60.0,
          child: Center(child: Text('Angle: ${angle.toStringAsFixed(2)}'))
          flex: 1,
          child: RadialSlider(
            color: Colors.yellow,
            backgroundColor: Colors.blue,
            backgroundGradient: null,
            radius: 120.0,
            initialAngle: angle,
            maxAngle: pi * 2 - START_ANGLE,
            onChange: (a) {
              setState(() {
                angle = a;
            onChanging: (a) {
              setState(() {
                angle = a;
          height: 30.0,

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  radial_slider: ^0.0.2

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:radial_slider/radial_slider.dart';
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Learn more about scoring.

We analyzed this package on Oct 11, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.5.1
  • pana: 0.12.21
  • Flutter: 1.9.1+hotfix.4


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Health suggestions

Fix lib/src/radial_slider.dart. (-0.50 points)

Analysis of lib/src/radial_slider.dart reported 1 hint:

line 4 col 7: This class (or a class which this class inherits from) is marked as '@immutable', but one or more of its instance fields are not final: RadialSlider.radius, RadialSlider.minAngle, RadialSlider.maxAngle, RadialSlider.initialAngle, RadialSlider.background, RadialSlider.color, RadialSlider.backgroundColor, RadialSlider.backgroundGradient, RadialSlider.onChange, RadialSlider.onChanging

Maintenance suggestions

The package description is too short. (-20 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

Package is getting outdated. (-6.85 points)

The package was last published 55 weeks ago.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.19.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies