Flutter-charts_flutter chart plugin

pub.dev search charts_flutter

Import dependence

charts_flutter: ^0.8.1

Project Import

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

example

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

class IndexGrowUpScreen extends StatefulWidget {
  @override
  _IndexGrowUpScreenState createState() => _IndexGrowUpScreenState();
}

class _IndexGrowUpScreenState extends State<IndexGrowUpScreen> {

  String _year;
  double _sales;
  //点击柱状图触发的函数
  _onSelectionChanged(charts.SelectionModel model) {
    final selectedDatum = model.selectedDatum;
    print(selectedDatum.first.datum.year);
    print(selectedDatum.first.datum.sales);
    print(selectedDatum.first.series.displayName);
    setState(() {
      //改变两个显示的数值
      _year = selectedDatum.first.datum.year;
      _sales = selectedDatum.first.datum.sales;
    });
  }



  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: <Widget>[
          Row(
            children: <Widget>[
              Expanded(
                child: Container(
                  Alignment: Alignment.center,
                  child: Text( "Date: year $ {_}" ), 
                ), 
              ), 
              Expanded ( 
                Child: Container ( 
                  Alignment: Alignment.center, 
                  Child: the Text ( "numerical value: $ {_} Sales" ), 
                ), 
              ) 
            ] , 
          ), 
          Container ( 
            width: Double .infinity, 
            height: 200.0 , 
            Child: charts.BarChart ( 
              // by obtaining the following data into 
              ChartFlutterBean.createSampleData (),
              // configuration item, and set the trigger function
              selectionModels: [ 
                charts.SelectionModelConfig ( 
                  type: charts.SelectionModelType.info, 
                  changedListener: _onSelectionChanged, 
                ) 
              ], 
            ), 
          ), 
        ], 
      ), 
    ); 
  } 


} 
// at a combination portion of the histogram data 
class OrdinalSales {
   Final String year;
   Final  Double Sales; 

  OrdinalSales ( the this .year, the this .sales); 
} 


class ChartFlutterBean { 

  static List<charts.Series<OrdinalSales, String>> createSampleData() {
    final data = [
      OrdinalSales('日', 114),
      OrdinalSales('一', 115),
      OrdinalSales('二', 116),
      OrdinalSales('三', 117),
      OrdinalSales('四', 118),
      OrdinalSales('五', 119),
      OrdinalSales('六', 120),
      OrdinalSales('日', 121),
    ];

    return [
      new charts.Series<OrdinalSales, String>(
        id: 'Sales',
        colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
        domainFn: (OrdinalSales sales, _) => sales.year,
        measureFn: (OrdinalSales sales, _) => sales.sales,
        data: data,
      )
    ];
  }
}