radial_charts 0.1.3

A collection of customizable radial chart widgets for Flutter. Display ratings and data across multiple categories with variable radius segments, perfect for visualizing assessments, reviews, and mult [...]

Radial Charts

A collection of customizable radial chart widgets for Flutter. Display ratings and data across multiple categories with variable radius segments, perfect for visualizing assessments, reviews, and multi-dimensional data.

Features

✨ Variable Radius Segments - Each category's segment radius represents its rating value 🎨 Highly Customizable - Colors, grid levels, opacity, borders, and more 📦 Predefined Categories - Life balance, skills, product features templates 📊 Legend Support - Optional legend with customizable layout 🚀 Zero Dependencies - Pure Flutter implementation ⚡ Performance Optimized - Efficient CustomPainter rendering

Screenshots

Life Balance	Skills Assessment
Product Features	Custom Example (Weekly Mood)

Installation

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

dependencies:
  radial_charts: ^0.1.3

Then run:

flutter pub get

Usage

Basic Example

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

RadialRatingChart(
  data: [
    CategoryData(
      category: ChartCategory(
        id: 'health',
        name: 'Health',
        color: Colors.green,
        emoji: '🏃',
      ),
      rating: 8,
    ),
    CategoryData(
      category: ChartCategory(
        id: 'career',
        name: 'Career',
        color: Colors.blue,
        emoji: '💼',
      ),
      rating: 6,
    ),
    CategoryData(
      category: ChartCategory(
        id: 'relationships',
        name: 'Relationships',
        color: Colors.pink,
        emoji: '❤️',
      ),
      rating: 9,
    ),
  ],
  config: ChartConfig(size: 300),
  showLegend: true,
)

With Custom Configuration

RadialRatingChart(
  data: yourCategoryData,
  config: ChartConfig(
    size: 320,
    maxRating: 10,
    minRating: 1,
    gridLevels: 10,
    gridColor: Colors.grey.withOpacity(0.3),
    segmentOpacity: 0.7,
    showSegmentBorders: true,
  ),
  showLegend: true,
  legendColumns: 2,
)

Using Predefined Categories

The package includes predefined category sets for common use cases:

// Life Balance
RadialRatingChart(
  data: DefaultCategories.lifeBalance
      .map((cat) => CategoryData(category: cat, rating: 7))
      .toList(),
)

// Skills Assessment
RadialRatingChart(
  data: DefaultCategories.skills
      .map((cat) => CategoryData(category: cat, rating: 8))
      .toList(),
)

// Product Features
RadialRatingChart(
  data: DefaultCategories.productFeatures
      .map((cat) => CategoryData(category: cat, rating: 6))
      .toList(),
)

API Reference

RadialRatingChart

Main widget for displaying the chart.

Property	Type	Default	Description
data	List<CategoryData>	required	List of category data to display
config	ChartConfig?	ChartConfig()	Configuration for chart appearance
showLegend	bool	false	Whether to show legend
legendColumns	int	2	Number of columns in legend
legendSpacing	double	8.0	Spacing between legend items
legendIndicatorSize	double	16.0	Size of color indicator
legendTextStyle	TextStyle?	null	Text style for legend

ChartCategory

Represents a category in the chart.

Property	Type	Required	Description
id	String	✅	Unique identifier
name	String	✅	Display name
color	Color	✅	Segment color
emoji	String?	❌	Optional emoji/icon
description	String?	❌	Optional description

CategoryData

Combines a category with its rating value.

Property	Type	Description
category	ChartCategory	The category being rated
rating	double	Rating value (typically 1-10)

ChartConfig

Configuration for chart appearance.

Property	Type	Default	Description
size	double	280.0	Chart size (width & height)
maxRating	int	10	Maximum rating value
minRating	int	1	Minimum rating value
gridLevels	int	10	Number of concentric circles
gridColor	Color	Color(0x4D000000)	Grid line color
gridStrokeWidth	double	1.0	Grid line width
segmentOpacity	double	0.7	Segment opacity (0.0-1.0)
showSegmentBorders	bool	true	Show segment borders
segmentBorderColor	Color?	null	Border color (auto if null)
segmentBorderWidth	double	0.5	Border width
startAngle	double	-π/2	Start angle in radians
sortCategoriesById	bool	true	Sort categories by ID

Examples

Check out the example folder for complete examples including:

• Life Balance Assessment
• Skills Proficiency Chart
• Product Features Rating
• Custom Data Visualization

Run the example:

cd example
flutter run

Use Cases

• 📊 Life Balance Wheels - Track satisfaction across life areas
• 💼 Skills Assessment - Visualize competency levels
• ⭐ Product Reviews - Display multi-dimensional ratings
• 📈 Performance Metrics - Show KPIs across categories
• 🎯 Goal Tracking - Monitor progress in different areas
• 📝 Survey Results - Present multi-category survey data

How It Works

The Radial Rating Chart is a variation of a pie chart where:

• Each segment represents a category
• The radius of each segment varies based on the rating (unlike traditional pie charts)
• Higher ratings extend further from the center
• The chart includes a grid for easy value reading

This makes it perfect for comparing multiple ratings at a glance, especially when you want to see which areas score higher or lower.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Author

Created by hzfty

Support

If you find this package useful, please give it a ⭐ on GitHub!

For bugs or feature requests, please file an issue on GitHub Issues.

Changelog

See CHANGELOG.md for version history.