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124 lines
4.4 KiB
124 lines
4.4 KiB
6 years ago
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// 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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/// Horizontal bar chart with bar label renderer example and hidden domain axis.
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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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5 years ago
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import 'package:flutter/material.dart';
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6 years ago
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class HorizontalBarLabelChart extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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HorizontalBarLabelChart(this.seriesList, {this.animate});
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/// Creates a [BarChart] with sample data and no transition.
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factory HorizontalBarLabelChart.withSampleData() {
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return new HorizontalBarLabelChart(
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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 HorizontalBarLabelChart.withRandomData() {
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return new HorizontalBarLabelChart(_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 data = [
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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: 'Sales',
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domainFn: (OrdinalSales sales, _) => sales.year,
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measureFn: (OrdinalSales sales, _) => sales.sales,
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data: data,
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// Set a label accessor to control the text of the bar label.
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labelAccessorFn: (OrdinalSales sales, _) =>
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'${sales.year}: \$${sales.sales.toString()}')
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];
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}
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// EXCLUDE_FROM_GALLERY_DOCS_END
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// [BarLabelDecorator] will automatically position the label
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// inside the bar if the label will fit. If the label will not fit and the
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// area outside of the bar is larger than the bar, it will draw outside of the
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// bar. Labels can always display inside or outside using [LabelPosition].
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//
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// Text style for inside / outside can be controlled independently by setting
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// [insideLabelStyleSpec] and [outsideLabelStyleSpec].
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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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vertical: false,
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// Set a bar label decorator.
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// Example configuring different styles for inside/outside:
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// barRendererDecorator: new charts.BarLabelDecorator(
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// insideLabelStyleSpec: new charts.TextStyleSpec(...),
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// outsideLabelStyleSpec: new charts.TextStyleSpec(...)),
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barRendererDecorator: new charts.BarLabelDecorator<String>(),
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// Hide domain axis.
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domainAxis:
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new charts.OrdinalAxisSpec(renderSpec: new charts.NoneRenderSpec()),
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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<OrdinalSales, String>> _createSampleData() {
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final data = [
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new OrdinalSales('2014', 5),
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new OrdinalSales('2015', 25),
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new OrdinalSales('2016', 100),
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new OrdinalSales('2017', 75),
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];
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return [
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new charts.Series<OrdinalSales, String>(
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id: 'Sales',
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domainFn: (OrdinalSales sales, _) => sales.year,
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measureFn: (OrdinalSales sales, _) => sales.sales,
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data: data,
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// Set a label accessor to control the text of the bar label.
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labelAccessorFn: (OrdinalSales sales, _) =>
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'${sales.year}: \$${sales.sales.toString()}')
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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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