74 lines
2.5 KiB
Dart
74 lines
2.5 KiB
Dart
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/// Donut chart with labels example. This is a simple pie chart with a hole in
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/// the middle.
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import 'package:charts_flutter/flutter.dart' as charts;
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import 'package:flutter/material.dart';
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class DonutAutoLabelChart extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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DonutAutoLabelChart(this.seriesList, {this.animate});
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/// Creates a [PieChart] with sample data and no transition.
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factory DonutAutoLabelChart.withSampleData() {
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return new DonutAutoLabelChart(
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_createSampleData(),
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// Disable animations for image tests.
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animate: true,
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);
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}
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@override
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Widget build(BuildContext context) {
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return new charts.PieChart(seriesList,
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animate: animate,
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// Configure the width of the pie slices to 60px. The remaining space in
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// the chart will be left as a hole in the center.
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//
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// [ArcLabelDecorator] will automatically position the label inside the
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// arc if the label will fit. If the label will not fit, it will draw
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// outside of the arc with a leader line. Labels can always display
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// inside or outside using [LabelPosition].
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//
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// Text style for inside / outside can be controlled independently by
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// setting [insideLabelStyleSpec] and [outsideLabelStyleSpec].
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//
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// Example configuring different styles for inside/outside:
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// new charts.ArcLabelDecorator(
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// insideLabelStyleSpec: new charts.TextStyleSpec(...),
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// outsideLabelStyleSpec: new charts.TextStyleSpec(...)),
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defaultRenderer: new charts.ArcRendererConfig(
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arcWidth: 60,
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arcRendererDecorators: [new charts.ArcLabelDecorator()]));
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}
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/// Create one series with sample hard coded data.
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static List<charts.Series<LinearSales, String>> _createSampleData() {
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final data = [
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new LinearSales("Other", 17),
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new LinearSales("Mars", 26),
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new LinearSales("Morecambe", 35),
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new LinearSales("Lancaster", 48),
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];
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return [
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new charts.Series<LinearSales, String>(
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id: 'Sales',
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domainFn: (LinearSales sales, _) => sales.key,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: data,
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// Set a label accessor to control the text of the arc label.
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labelAccessorFn: (LinearSales row, _) => '${row.key}: ${row.sales}',
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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 String key;
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final int sales;
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LinearSales(this.key, this.sales);
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}
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