charts
Grouped Fill Color Bar Chart Example
Example:
/// Bar chart example
import 'package:flutter/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;
/// Example of a grouped bar chart with three series, each rendered with
/// different fill colors.
class GroupedFillColorBarChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
GroupedFillColorBarChart(this.seriesList, {this.animate});
factory GroupedFillColorBarChart.withSampleData() {
return new GroupedFillColorBarChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
return new charts.BarChart(
seriesList,
animate: animate,
// Configure a stroke width to enable borders on the bars.
defaultRenderer: new charts.BarRendererConfig(
groupingType: charts.BarGroupingType.grouped, strokeWidthPx: 2.0),
);
}
/// Create series list with multiple series
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
final desktopSalesData = [
new OrdinalSales('2014', 5),
new OrdinalSales('2015', 25),
new OrdinalSales('2016', 100),
new OrdinalSales('2017', 75),
];
final tableSalesData = [
new OrdinalSales('2014', 25),
new OrdinalSales('2015', 50),
new OrdinalSales('2016', 10),
new OrdinalSales('2017', 20),
];
final mobileSalesData = [
new OrdinalSales('2014', 10),
new OrdinalSales('2015', 50),
new OrdinalSales('2016', 50),
new OrdinalSales('2017', 45),
];
return [
// Blue bars with a lighter center color.
new charts.Series<OrdinalSales, String>(
id: 'Desktop',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: desktopSalesData,
colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
fillColorFn: (_, __) =>
charts.MaterialPalette.blue.shadeDefault.lighter,
),
// Solid red bars. Fill color will default to the series color if no
// fillColorFn is configured.
new charts.Series<OrdinalSales, String>(
id: 'Tablet',
measureFn: (OrdinalSales sales, _) => sales.sales,
data: tableSalesData,
colorFn: (_, __) => charts.MaterialPalette.red.shadeDefault,
domainFn: (OrdinalSales sales, _) => sales.year,
),
// Hollow green bars.
new charts.Series<OrdinalSales, String>(
id: 'Mobile',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: mobileSalesData,
colorFn: (_, __) => charts.MaterialPalette.green.shadeDefault,
fillColorFn: (_, __) => charts.MaterialPalette.transparent,
),
];
}
}
/// Sample ordinal data type.
class OrdinalSales {
final String year;
final int sales;
OrdinalSales(this.year, this.sales);
}