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106 lines
3.0 KiB
106 lines
3.0 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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/// Bar chart with series legend example
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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 SimpleDatumLegend extends StatelessWidget {
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final List<charts.Series<dynamic, int>> seriesList;
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final bool? animate;
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const SimpleDatumLegend(this.seriesList, {this.animate, Key? key})
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: super(key: key);
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factory SimpleDatumLegend.withSampleData() {
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return SimpleDatumLegend(
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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 SimpleDatumLegend.withRandomData() {
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return SimpleDatumLegend(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<LinearSales, int>> _createRandomData() {
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final random = Random();
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final data = [
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LinearSales(0, random.nextInt(100)),
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LinearSales(1, random.nextInt(100)),
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LinearSales(2, random.nextInt(100)),
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LinearSales(3, random.nextInt(100)),
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];
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return [
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charts.Series<LinearSales, int>(
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id: 'Sales',
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales 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.PieChart(
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seriesList,
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animate: animate,
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// Add the series legend behavior to the chart to turn on series legends.
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// By default the legend will display above the chart.
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behaviors: [charts.DatumLegend()],
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);
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}
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/// Create series list with one series
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static List<charts.Series<LinearSales, int>> _createSampleData() {
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final data = [
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LinearSales(0, 100),
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LinearSales(1, 75),
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LinearSales(2, 25),
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LinearSales(3, 5),
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];
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return [
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charts.Series<LinearSales, int>(
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id: 'Sales',
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales 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 linear data type.
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class LinearSales {
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final int year;
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final int sales;
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LinearSales(this.year, this.sales);
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}
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