Library for creating animated circular chart widgets with Flutter

A library for creating animated circular chart widgets with Flutter

Overview

Create easily animated pie charts and radial charts by providing them with data objects they can plot into charts and animate between.

Check the examples folder for the source code for the above screenshots.

Installation

Install the latest version from pub.

Getting Started

Import the package:

import 'package:flutter_circular_chart/flutter_circular_chart.dart';

Create a GlobalKey to be able to access the chart and update its data:

final GlobalKey<AnimatedCircularChartState> _chartKey = new GlobalKey<AnimatedCircularChartState>();

Create chart data entry objects:

List<CircularStackEntry> data = <CircularStackEntry>[
  new CircularStackEntry(
    <CircularSegmentEntry>[
      new CircularSegmentEntry(500.0, Colors.red[200], rankKey: 'Q1'),
      new CircularSegmentEntry(1000.0, Colors.green[200], rankKey: 'Q2'),
      new CircularSegmentEntry(2000.0, Colors.blue[200], rankKey: 'Q3'),
      new CircularSegmentEntry(1000.0, Colors.yellow[200], rankKey: 'Q4'),
    ],
    rankKey: 'Quarterly Profits',
  ),
];

Create an AnimatedCircularChart, passing it the _chartKey and initial data:

@override
Widget build(BuildContext context) {
  return new AnimatedCircularChart(
    key: _chartKey,
    size: const Size(300.0, 300.0),
    initialChartData: data,
    chartType: CircularChartType.Pie,
  );
}

Call updateData to animate the chart:

void _cycleSamples() {
  List<CircularStackEntry> nextData = <CircularStackEntry>[
    new CircularStackEntry(
      <CircularSegmentEntry>[
        new CircularSegmentEntry(1500.0, Colors.red[200], rankKey: 'Q1'),
        new CircularSegmentEntry(750.0, Colors.green[200], rankKey: 'Q2'),
        new CircularSegmentEntry(2000.0, Colors.blue[200], rankKey: 'Q3'),
        new CircularSegmentEntry(1000.0, Colors.yellow[200], rankKey: 'Q4'),
      ],
      rankKey: 'Quarterly Profits',
    ),
  ];
  setState(() {
    _chartKey.currentState.updateData(nextData);
  });
}

Customization

Hole Label:

Property	Default
holeLabel	null
labelStyle	Theme.of(context).textTheme.body2

Example:

new AnimatedCircularChart(
  key: _chartKey,
  size: _chartSize,
  initialChartData: <CircularStackEntry>[
    new CircularStackEntry(
      <CircularSegmentEntry>[
        new CircularSegmentEntry(
          33.33,
          Colors.blue[400],
          rankKey: 'completed',
        ),
        new CircularSegmentEntry(
          66.67,
          Colors.blueGrey[600],
          rankKey: 'remaining',
        ),
      ],
      rankKey: 'progress',
    ),
  ],
  chartType: CircularChartType.Radial,
  percentageValues: true,
  holeLabel: '1/3',
  labelStyle: new TextStyle(
    color: Colors.blueGrey[600],
    fontWeight: FontWeight.bold,
    fontSize: 24.0,
  ),
)

---

Segment Edge Style:

Property	Default
edgeStyle	SegmentEdgeStyle.flat

SegmentEdgeStyle	Description
flat (default)	Segments begin and end with a flat edge.
round	Segments begin and end with a semi-circle.

Example:

new AnimatedCircularChart(
  key: _chartKey,
  size: _chartSize,
  initialChartData: <CircularStackEntry>[
    new CircularStackEntry(
      <CircularSegmentEntry>[
        new CircularSegmentEntry(
          33.33,
          Colors.blue[400],
          rankKey: 'completed',
        ),
        new CircularSegmentEntry(
          66.67,
          Colors.blueGrey[600],
          rankKey: 'remaining',
        ),
      ],
      rankKey: 'progress',
    ),
  ],
  chartType: CircularChartType.Radial,
  edgeStyle: SegmentEdgeStyle.round,
  percentageValues: true,
)