Flutter Chart

最近要在一个flutter的应用上实现图表,在官方的库里找到了一个现成的chart library。







使用前,请先在项目根目录下使用pub get进行安装:

flutter pub add charts_flutter


charts_flutter: ^0.12.0


我在lib文件夹下新建了一个pie.dart 的文件:

import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';

class SimplePieChart extends StatelessWidget {
final Listcharts.Series> seriesList; final bool animate;
SimplePieChart(this.seriesList, {this.animate});
/// Creates a [PieChart] with sample data and no transition. factory SimplePieChart.withSampleData() {
return new SimplePieChart(
_createSampleData(), // Disable animations for image tests. animate: false, ); }

factory SimplePieChart.withInputData(seriesList) {
return new SimplePieChart(seriesList, animate: true); }

@override Widget build(BuildContext context) {
return Container(
child: new charts.PieChart(seriesList, animate: animate), ); }

/// Create one series with sample hard coded data. static List> _createSampleData() {
final data = [
new LinearSales(0, 1), new LinearSales(1, 99), ];
return [
new charts.SeriesLinearSales, int>(
id: 'Sales',
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: data,
]; }

/// Sample linear data type.
class LinearSales {
final int year; final double sales;
LinearSales(this.year, this.sales);



import 'package:flutter/material.dart';
import 'pie.dart';
import 'package:charts_flutter/flutter.dart' as charts;

void main() {

class MyApp extends StatelessWidget {
// This widget is the root of your application.
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Chart',
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,
home: MyHomePage(title: '图表'),

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;

_MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends StateMyHomePage> {
double p = 50.0;
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(
child: Column(crossAxisAlignment: CrossAxisAlignment.start,

// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
children: [
flex: 3,
child: new SimplePieChart.withInputData([
new charts.SeriesLinearSales, int>(
id: 'Sales',
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: [
new LinearSales(0, 100 - p),
new LinearSales(1, p),





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