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