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107 lines
3.3 KiB
107 lines
3.3 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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/// Gauge chart example, where the data does not cover a full revolution in the
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/// chart.
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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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import 'package:flutter/material.dart';
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class GaugeChart extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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const GaugeChart(this.seriesList, {this.animate, Key key}) : super(key: key);
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/// Creates a [PieChart] with sample data and no transition.
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factory GaugeChart.withSampleData() {
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return GaugeChart(
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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 GaugeChart.withRandomData() {
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return GaugeChart(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<GaugeSegment, String>> _createRandomData() {
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final random = Random();
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final data = [
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GaugeSegment('Low', random.nextInt(100)),
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GaugeSegment('Acceptable', random.nextInt(100)),
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GaugeSegment('High', random.nextInt(100)),
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GaugeSegment('Highly Unusual', random.nextInt(100)),
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];
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return [
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charts.Series<GaugeSegment, String>(
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id: 'Segments',
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domainFn: (GaugeSegment segment, _) => segment.segment,
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measureFn: (GaugeSegment segment, _) => segment.size,
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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(seriesList,
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animate: animate,
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// Configure the width of the pie slices to 30px. The remaining space in
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// the chart will be left as a hole in the center. Adjust the start
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// angle and the arc length of the pie so it resembles a gauge.
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defaultRenderer: charts.ArcRendererConfig(
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arcWidth: 30, startAngle: 4 / 5 * pi, arcLength: 7 / 5 * pi));
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}
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/// Create one series with sample hard coded data.
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static List<charts.Series<GaugeSegment, String>> _createSampleData() {
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final data = [
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GaugeSegment('Low', 75),
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GaugeSegment('Acceptable', 100),
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GaugeSegment('High', 50),
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GaugeSegment('Highly Unusual', 5),
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];
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return [
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charts.Series<GaugeSegment, String>(
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id: 'Segments',
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domainFn: (GaugeSegment segment, _) => segment.segment,
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measureFn: (GaugeSegment segment, _) => segment.size,
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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 data type.
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class GaugeSegment {
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final String segment;
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final int size;
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GaugeSegment(this.segment, this.size);
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}
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