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samples/web/charts/lib/bar_chart/horizontal_bar_label.dart

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// 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.
/// Horizontal bar chart with bar label renderer example and hidden domain axis.
// 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 HorizontalBarLabelChart extends StatelessWidget {
final List<charts.Series<dynamic, String>> seriesList;
final bool? animate;
const HorizontalBarLabelChart(this.seriesList, {this.animate, Key? key})
: super(key: key);
/// Creates a [BarChart] with sample data and no transition.
factory HorizontalBarLabelChart.withSampleData() {
return HorizontalBarLabelChart(
_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 HorizontalBarLabelChart.withRandomData() {
return HorizontalBarLabelChart(_createRandomData());
}
/// Create random data.
static List<charts.Series<OrdinalSales, String>> _createRandomData() {
final random = Random();
final data = [
OrdinalSales('2014', random.nextInt(100)),
OrdinalSales('2015', random.nextInt(100)),
OrdinalSales('2016', random.nextInt(100)),
OrdinalSales('2017', random.nextInt(100)),
];
return [
charts.Series<OrdinalSales, String>(
id: 'Sales',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: data,
// Set a label accessor to control the text of the bar label.
labelAccessorFn: (OrdinalSales sales, _) =>
'${sales.year}: \$${sales.sales.toString()}')
];
}
// EXCLUDE_FROM_GALLERY_DOCS_END
// [BarLabelDecorator] will automatically position the label
// inside the bar if the label will fit. If the label will not fit and the
// area outside of the bar is larger than the bar, it will draw outside of the
// bar. Labels can always display inside or outside using [LabelPosition].
//
// Text style for inside / outside can be controlled independently by setting
// [insideLabelStyleSpec] and [outsideLabelStyleSpec].
@override
Widget build(BuildContext context) {
return charts.BarChart(
seriesList,
animate: animate,
vertical: false,
// Set a bar label decorator.
// Example configuring different styles for inside/outside:
// barRendererDecorator: new charts.BarLabelDecorator(
// insideLabelStyleSpec: new charts.TextStyleSpec(...),
// outsideLabelStyleSpec: new charts.TextStyleSpec(...)),
barRendererDecorator: charts.BarLabelDecorator<String>(),
// Hide domain axis.
domainAxis:
const charts.OrdinalAxisSpec(renderSpec: charts.NoneRenderSpec()),
);
}
/// Create one series with sample hard coded data.
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
final data = [
OrdinalSales('2014', 5),
OrdinalSales('2015', 25),
OrdinalSales('2016', 100),
OrdinalSales('2017', 75),
];
return [
charts.Series<OrdinalSales, String>(
id: 'Sales',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: data,
// Set a label accessor to control the text of the bar label.
labelAccessorFn: (OrdinalSales sales, _) =>
'${sales.year}: \$${sales.sales.toString()}')
];
}
}
/// Sample ordinal data type.
class OrdinalSales {
final String year;
final int sales;
OrdinalSales(this.year, this.sales);
}