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samples/web/charts/lib/line_chart/range_annotation.dart

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4.1 KiB

// 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.
/// Line chart with range annotations example.
// EXCLUDE_FROM_GALLERY_DOCS_START
import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class LineRangeAnnotationChart extends StatelessWidget {
final List<charts.Series<dynamic, num>> seriesList;
final bool? animate;
const LineRangeAnnotationChart(this.seriesList, {this.animate, Key? key})
: super(key: key);
/// Creates a [LineChart] with sample data and range annotations.
///
/// The second annotation extends beyond the range of the series data,
/// demonstrating the effect of the [Charts.RangeAnnotation.extendAxis] flag.
/// This can be set to false to disable range extension.
factory LineRangeAnnotationChart.withSampleData() {
return LineRangeAnnotationChart(
_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 LineRangeAnnotationChart.withRandomData() {
return LineRangeAnnotationChart(_createRandomData());
}
/// Create random data.
static List<charts.Series<LinearSales, num>> _createRandomData() {
final random = Random();
final data = [
LinearSales(0, random.nextInt(100)),
LinearSales(1, random.nextInt(100)),
LinearSales(2, random.nextInt(100)),
// Fix one of the points to 100 so that the annotations are consistently
// placed.
LinearSales(3, 100),
];
return [
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 charts.LineChart(seriesList, animate: animate, behaviors: [
charts.RangeAnnotation([
charts.RangeAnnotationSegment(
0.5, 1.0, charts.RangeAnnotationAxisType.domain,
startLabel: 'Domain 1'),
charts.RangeAnnotationSegment(
2, 4, charts.RangeAnnotationAxisType.domain,
endLabel: 'Domain 2', color: charts.MaterialPalette.gray.shade200),
charts.RangeAnnotationSegment(
15, 20, charts.RangeAnnotationAxisType.measure,
startLabel: 'Measure 1 Start',
endLabel: 'Measure 1 End',
color: charts.MaterialPalette.gray.shade300),
charts.RangeAnnotationSegment(
35, 65, charts.RangeAnnotationAxisType.measure,
startLabel: 'Measure 2 Start',
endLabel: 'Measure 2 End',
color: charts.MaterialPalette.gray.shade400),
]),
]);
}
/// Create one series with sample hard coded data.
static List<charts.Series<LinearSales, int>> _createSampleData() {
final data = [
LinearSales(0, 5),
LinearSales(1, 25),
LinearSales(2, 100),
LinearSales(3, 75),
];
return [
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);
}