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samples/web/charts/example/lib/legends/simple_datum_legend.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.
/// Bar chart with series legend example
// EXCLUDE_FROM_GALLERY_DOCS_START
import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:flutter_web/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;
class SimpleDatumLegend extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
SimpleDatumLegend(this.seriesList, {this.animate});
factory SimpleDatumLegend.withSampleData() {
return new SimpleDatumLegend(
_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 SimpleDatumLegend.withRandomData() {
return new SimpleDatumLegend(_createRandomData());
}
/// Create random data.
static List<charts.Series<LinearSales, int>> _createRandomData() {
final random = new Random();
final data = [
new LinearSales(0, random.nextInt(100)),
new LinearSales(1, random.nextInt(100)),
new LinearSales(2, random.nextInt(100)),
new LinearSales(3, random.nextInt(100)),
];
return [
new charts.Series<LinearSales, int>(
id: 'Sales',
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: data,
)
];
}
// EXCLUDE_FROM_GALLERY_DOCS_END
@override
Widget build(BuildContext context) {
return new charts.PieChart(
seriesList,
animate: animate,
// Add the series legend behavior to the chart to turn on series legends.
// By default the legend will display above the chart.
behaviors: [new charts.DatumLegend()],
);
}
/// Create series list with one series
static List<charts.Series<LinearSales, int>> _createSampleData() {
final data = [
new LinearSales(0, 100),
new LinearSales(1, 75),
new LinearSales(2, 25),
new LinearSales(3, 5),
];
return [
new charts.Series<LinearSales, int>(
id: 'Sales',
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.sales,
data: data,
)
];
}
}
/// Sample linear data type.
class LinearSales {
final int year;
final int sales;
LinearSales(this.year, this.sales);
}