charter 0.0.1-alpha-3

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charter #

A collection of chart implementations for Flutter.

So far this supports the following:

  • PolarAreaChart

Screenshots #

polar-area-chart-example.png

QuickStart #

Add Dependency #

dependencies:
	charter: 0.0.1-alpha-2

Update Packages #

$ flutter pub get

Import Package #

import 'package:charter/charter.dart';

Add the following code snippet and tweak

PolarAreaChart.basic(
  grid: [5,10,15], // Scale for the whole chart
  features: [
    "broccoli",
    "cheese",
    "salmon",
    "potato",
    "carrot",
    "rice",
    "lentils",
    "covfefe",
    "pasta",
    "beef",
    "grains"
  ],
  // Features and data must be same length
  data: [3,1,5,14,6,2,9,13,5,6,10],
  featuresTextStyle: TextStyle (
    fontWeight: FontWeight.bold,
    fontSize: 12
  ),
  drawSegmentDividers: true,
  // Colours are repeated if less than data.length
  featureColors: [
    Colors.green,
    Colors.blue,
    Colors.red,
    Colors.orange,
    Colors.yellow,
    Colors.pink,
    Colors.brown
  ]
)

[0.0.1-alpha-3] - 2020-05-07 #

  • Accept Color objects instead of just MaterialColor

[0.0.1-alpha-2] - 2020-05-07 #

  • Added missing dispose() and update text x coord to take into account newlines

[0.0.1-alpha-1] - 2020-05-07 #

  • Added Polar Area Chart

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:charter/charter.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: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();

}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Expanded(
                child: PolarAreaChart.basic(
                  grid: [5,10,15], // Scale for the whole chart
                  features: [
                    "broccoli",
                    "cheese",
                    "salmon",
                    "potato",
                    "carrot",
                    "rice\ngammonamon",
                    "lentils",
                    "covfefe",
                    "pasta",
                    "beef",
                    "grains"
                  ],
                  data: [3,1,5,14,6.5,2,9.8,13,5,6,10],
                  featuresTextStyle: TextStyle (
                    fontWeight: FontWeight.bold,
                    fontSize: 12
                  ),
                  drawSegmentDividers: true,
                  featureColors: [
                    Colors.green,
                    Colors.blue,
                    Colors.red,
                    Colors.orange,
                    Colors.yellow,
                    Colors.pink,
                    Colors.brown,
                    Color(0xff374ABE),
                    Colors.red[600]
                  ]
                )
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Use this package as a library

1. Depend on it

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


dependencies:
  charter: ^0.0.1-alpha-3

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:charter/charter.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
34
Health:
Code health derived from static analysis. [more]
99
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
80
Overall:
Weighted score of the above. [more]
63
Learn more about scoring.

We analyzed this package on Jul 2, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.8.4
  • pana: 0.13.13
  • Flutter: 1.17.5

Analysis suggestions

Package not compatible with SDK dart

because of import path [charter] that is in a package requiring null.

Health suggestions

Fix lib/charter.dart. (-1 points)

Analysis of lib/charter.dart reported 2 hints:

line 5 col 8: Unused import: 'dart:developer'.

line 9 col 39: The name max is shown, but isn’t used.

Maintenance suggestions

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 pre-release. (-5 points)

Pre-release versions should be used with caution; their API can change in breaking ways.

Homepage URL is insecure. (-5 points)

Update the homepage field and use a secure (https) URL.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.7.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.12 1.14.13
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6 1.2.0
vector_math 2.0.8
Dev dependencies
flutter_test