Example:
/// Example of a stacked area chart.
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class StackedAreaLineChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
StackedAreaLineChart(this.seriesList, {this.animate});
/// Creates a [LineChart] with sample data and no transition.
factory StackedAreaLineChart.withSampleData() {
return new StackedAreaLineChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
return new charts.LineChart(seriesList,
defaultRenderer:
new charts.LineRendererConfig(includeArea: true, stacked: true),
animate: animate);
}
/// Create one series with sample hard coded data.
static List<charts.Series<LinearSales, int>> _createSampleData() {
final myFakeDesktopData = [
new LinearSales(0, 5),
new LinearSales(1, 25),
new LinearSales(2, 100),
new LinearSales(3, 75),
];
var myFakeTabletData = [
new LinearSales(0, 10),
new LinearSales(1, 50),
new LinearSales(2, 200),
new LinearSales(3, 150),
];
var myFakeMobileData = [
new LinearSales(0, 15),
new LinearSales(1, 75),
new LinearSales(2, 300),
new LinearSales(3, 225),
];
return [
new charts.Series<LinearSales, int>(
id: 'Desktop',
colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: myFakeDesktopData,
),
new charts.Series<LinearSales, int>(
id: 'Tablet',
colorFn: (_, __) => charts.MaterialPalette.red.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: myFakeTabletData,
),
new charts.Series<LinearSales, int>(
id: 'Mobile',
colorFn: (_, __) => charts.MaterialPalette.green.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: myFakeMobileData,
),
];
}
}
/// Sample linear data type.
class LinearSales {
final int year;
final int sales;
LinearSales(this.year, this.sales);
}