community_charts

Range Annotation Time Series Charts Example

Example:

/// Time series chart with range 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:community_charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';

class TimeSeriesRangeAnnotationChart extends StatelessWidget {
  final List<charts.Series> seriesList;
  final bool animate;

  TimeSeriesRangeAnnotationChart(this.seriesList, {this.animate});

  /// Creates a [TimeSeriesChart] with sample data and no transition.
  factory TimeSeriesRangeAnnotationChart.withSampleData() {
    return new TimeSeriesRangeAnnotationChart(
      _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.RangeAnnotationSegment(new DateTime(2017, 10, 4),
            new DateTime(2017, 10, 15), charts.RangeAnnotationAxisType.domain),
      ]),
    ]);
  }

  /// 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);
}