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121 lines
3.9 KiB
121 lines
3.9 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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/// Example of a percentage bar chart which shows each bar as the percentage of
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/// the total series measure value.
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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:flutter/material.dart';
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import 'package:charts_flutter/flutter.dart' as charts;
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class PercentOfSeriesBarChart extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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PercentOfSeriesBarChart(this.seriesList, {this.animate});
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/// Creates a stacked [BarChart] with sample data and no transition.
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factory PercentOfSeriesBarChart.withSampleData() {
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return new PercentOfSeriesBarChart(
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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 PercentOfSeriesBarChart.withRandomData() {
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return new PercentOfSeriesBarChart(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<OrdinalSales, String>> _createRandomData() {
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final random = new Random();
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final desktopSalesData = [
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new OrdinalSales('2014', random.nextInt(100)),
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new OrdinalSales('2015', random.nextInt(100)),
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new OrdinalSales('2016', random.nextInt(100)),
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new OrdinalSales('2017', random.nextInt(100)),
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new OrdinalSales('2014', random.nextInt(100)),
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new OrdinalSales('2015', random.nextInt(100)),
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new OrdinalSales('2016', random.nextInt(100)),
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new OrdinalSales('2017', random.nextInt(100)),
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];
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return [
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new charts.Series<OrdinalSales, String>(
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id: 'Desktop',
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domainFn: (OrdinalSales sales, _) => sales.year,
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measureFn: (OrdinalSales sales, _) => sales.sales,
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data: desktopSalesData,
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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 new charts.BarChart(
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seriesList,
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animate: animate,
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barGroupingType: charts.BarGroupingType.grouped,
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// Configures a [PercentInjector] behavior that will calculate measure
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// values as the percentage of the total of all data in its series.
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behaviors: [
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new charts.PercentInjector(
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totalType: charts.PercentInjectorTotalType.series)
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],
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// Configure the axis spec to show percentage values.
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primaryMeasureAxis: new charts.PercentAxisSpec(),
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);
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}
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/// Create series list with multiple series
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static List<charts.Series<OrdinalSales, String>> _createSampleData() {
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final desktopSalesData = [
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new OrdinalSales('2011', 5),
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new OrdinalSales('2012', 25),
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new OrdinalSales('2013', 50),
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new OrdinalSales('2014', 75),
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new OrdinalSales('2015', 100),
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new OrdinalSales('2016', 125),
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new OrdinalSales('2017', 200),
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new OrdinalSales('2018', 150),
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];
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return [
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new charts.Series<OrdinalSales, String>(
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id: 'Desktop',
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domainFn: (OrdinalSales sales, _) => sales.year,
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measureFn: (OrdinalSales sales, _) => sales.sales,
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data: desktopSalesData,
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),
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];
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}
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}
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/// Sample ordinal data type.
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class OrdinalSales {
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final String year;
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final int sales;
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OrdinalSales(this.year, this.sales);
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}
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