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samples/web/charts/lib/time_series_chart/range_annotation.dart

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3.8 KiB

// Copyright 2018 the Charts project authors. Please see the AUTHORS file
// for details.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/// 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.
// EXCLUDE_FROM_GALLERY_DOCS_START
import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class TimeSeriesRangeAnnotationChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
const TimeSeriesRangeAnnotationChart(this.seriesList, {this.animate, Key key})
: super(key: key);
/// Creates a [TimeSeriesChart] with sample data and no transition.
factory TimeSeriesRangeAnnotationChart.withSampleData() {
return TimeSeriesRangeAnnotationChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
// EXCLUDE_FROM_GALLERY_DOCS_START
// This section is excluded from being copied to the gallery.
// It is used for creating random series data to demonstrate animation in
// the example app only.
factory TimeSeriesRangeAnnotationChart.withRandomData() {
return TimeSeriesRangeAnnotationChart(_createRandomData());
}
/// Create random data.
static List<charts.Series<TimeSeriesSales, DateTime>> _createRandomData() {
final random = Random();
final data = [
TimeSeriesSales(DateTime(2017, 9, 19), random.nextInt(100)),
TimeSeriesSales(DateTime(2017, 9, 26), random.nextInt(100)),
TimeSeriesSales(DateTime(2017, 10, 3), random.nextInt(100)),
TimeSeriesSales(DateTime(2017, 10, 10), random.nextInt(100)),
];
return [
charts.Series<TimeSeriesSales, DateTime>(
id: 'Sales',
domainFn: (TimeSeriesSales sales, _) => sales.time,
measureFn: (TimeSeriesSales sales, _) => sales.sales,
data: data,
)
];
}
// EXCLUDE_FROM_GALLERY_DOCS_END
@override
Widget build(BuildContext context) {
return charts.TimeSeriesChart(seriesList, animate: animate, behaviors: [
charts.RangeAnnotation([
charts.RangeAnnotationSegment(DateTime(2017, 10, 4),
DateTime(2017, 10, 15), charts.RangeAnnotationAxisType.domain),
]),
]);
}
/// Create one series with sample hard coded data.
static List<charts.Series<TimeSeriesSales, DateTime>> _createSampleData() {
final data = [
TimeSeriesSales(DateTime(2017, 9, 19), 5),
TimeSeriesSales(DateTime(2017, 9, 26), 25),
TimeSeriesSales(DateTime(2017, 10, 3), 100),
TimeSeriesSales(DateTime(2017, 10, 10), 75),
];
return [
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);
}