charts
Line Annotation Time Series Charts Example
Example:
/// Time series chart with line annotation example
///
/// The example future range annotation extends beyond the range of the series
/// data, demonstrating the effect of the [Charts.RangeAnnotation.extendAxis]
/// flag. This can be set to false to disable range extension.
///
/// Additional annotations may be added simply by adding additional
/// [Charts.RangeAnnotationSegment] items to the list.
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class TimeSeriesLineAnnotationChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
TimeSeriesLineAnnotationChart(this.seriesList, {this.animate});
/// Creates a [TimeSeriesChart] with sample data and no transition.
factory TimeSeriesLineAnnotationChart.withSampleData() {
return new TimeSeriesLineAnnotationChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
return new charts.TimeSeriesChart(seriesList, animate: animate, behaviors: [
new charts.RangeAnnotation([
new charts.LineAnnotationSegment(
new DateTime(2017, 10, 4), charts.RangeAnnotationAxisType.domain,
startLabel: 'Oct 4'),
new charts.LineAnnotationSegment(
new DateTime(2017, 10, 15), charts.RangeAnnotationAxisType.domain,
endLabel: 'Oct 15'),
]),
]);
}
/// Create one series with sample hard coded data.
static List<charts.Series<TimeSeriesSales, DateTime>> _createSampleData() {
final data = [
new TimeSeriesSales(new DateTime(2017, 9, 19), 5),
new TimeSeriesSales(new DateTime(2017, 9, 26), 25),
new TimeSeriesSales(new DateTime(2017, 10, 3), 100),
new TimeSeriesSales(new DateTime(2017, 10, 10), 75),
];
return [
new charts.Series<TimeSeriesSales, DateTime>(
id: 'Sales',
domainFn: (TimeSeriesSales sales, _) => sales.time,
measureFn: (TimeSeriesSales sales, _) => sales.sales,
data: data,
)
];
}
}
/// Sample time series data type.
class TimeSeriesSales {
final DateTime time;
final int sales;
TimeSeriesSales(this.time, this.sales);
}