mirror of https://github.com/flutter/samples.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
146 lines
5.1 KiB
146 lines
5.1 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.
|
|
|
|
/// Example of setting an initial viewport for ordinal axis.
|
|
///
|
|
/// This allows for specifying the specific range of data to show that differs
|
|
/// from what was provided in the series list.
|
|
///
|
|
/// In this example, the series list has ordinal data from year 2014 to 2030,
|
|
/// but we want to show starting at 2018 and we only want to show 4 values.
|
|
/// We can do this by specifying an [OrdinalViewport] in [OrdinalAxisSpec].
|
|
|
|
// 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 OrdinalInitialViewport extends StatelessWidget {
|
|
final List<charts.Series> seriesList;
|
|
final bool animate;
|
|
|
|
OrdinalInitialViewport(this.seriesList, {this.animate});
|
|
|
|
/// Creates a [BarChart] with sample data and no transition.
|
|
factory OrdinalInitialViewport.withSampleData() {
|
|
return new OrdinalInitialViewport(
|
|
_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 OrdinalInitialViewport.withRandomData() {
|
|
return new OrdinalInitialViewport(_createRandomData());
|
|
}
|
|
|
|
/// Create random data.
|
|
static List<charts.Series<OrdinalSales, String>> _createRandomData() {
|
|
final random = new Random();
|
|
|
|
final data = [
|
|
new OrdinalSales('2014', random.nextInt(100)),
|
|
new OrdinalSales('2015', random.nextInt(100)),
|
|
new OrdinalSales('2016', random.nextInt(100)),
|
|
new OrdinalSales('2017', random.nextInt(100)),
|
|
new OrdinalSales('2018', random.nextInt(100)),
|
|
new OrdinalSales('2019', random.nextInt(100)),
|
|
new OrdinalSales('2020', random.nextInt(100)),
|
|
new OrdinalSales('2021', random.nextInt(100)),
|
|
new OrdinalSales('2022', random.nextInt(100)),
|
|
new OrdinalSales('2023', random.nextInt(100)),
|
|
new OrdinalSales('2024', random.nextInt(100)),
|
|
new OrdinalSales('2025', random.nextInt(100)),
|
|
new OrdinalSales('2026', random.nextInt(100)),
|
|
new OrdinalSales('2027', random.nextInt(100)),
|
|
new OrdinalSales('2028', random.nextInt(100)),
|
|
new OrdinalSales('2029', random.nextInt(100)),
|
|
new OrdinalSales('2030', random.nextInt(100)),
|
|
];
|
|
|
|
return [
|
|
new charts.Series<OrdinalSales, String>(
|
|
id: 'Sales',
|
|
colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
|
|
domainFn: (OrdinalSales sales, _) => sales.year,
|
|
measureFn: (OrdinalSales sales, _) => sales.sales,
|
|
data: data,
|
|
)
|
|
];
|
|
}
|
|
// EXCLUDE_FROM_GALLERY_DOCS_END
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return new charts.BarChart(
|
|
seriesList,
|
|
animate: animate,
|
|
// Set the initial viewport by providing a new AxisSpec with the
|
|
// desired viewport: a starting domain and the data size.
|
|
domainAxis: new charts.OrdinalAxisSpec(
|
|
viewport: new charts.OrdinalViewport('2018', 4)),
|
|
// Optionally add a pan or pan and zoom behavior.
|
|
// If pan/zoom is not added, the viewport specified remains the viewport.
|
|
behaviors: [new charts.PanAndZoomBehavior()],
|
|
);
|
|
}
|
|
|
|
/// Create one series with sample hard coded data.
|
|
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
|
|
final data = [
|
|
new OrdinalSales('2014', 5),
|
|
new OrdinalSales('2015', 25),
|
|
new OrdinalSales('2016', 100),
|
|
new OrdinalSales('2017', 75),
|
|
new OrdinalSales('2018', 33),
|
|
new OrdinalSales('2019', 80),
|
|
new OrdinalSales('2020', 21),
|
|
new OrdinalSales('2021', 77),
|
|
new OrdinalSales('2022', 8),
|
|
new OrdinalSales('2023', 12),
|
|
new OrdinalSales('2024', 42),
|
|
new OrdinalSales('2025', 70),
|
|
new OrdinalSales('2026', 77),
|
|
new OrdinalSales('2027', 55),
|
|
new OrdinalSales('2028', 19),
|
|
new OrdinalSales('2029', 66),
|
|
new OrdinalSales('2030', 27),
|
|
];
|
|
|
|
return [
|
|
new charts.Series<OrdinalSales, String>(
|
|
id: 'Sales',
|
|
colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
|
|
domainFn: (OrdinalSales sales, _) => sales.year,
|
|
measureFn: (OrdinalSales sales, _) => sales.sales,
|
|
data: data,
|
|
)
|
|
];
|
|
}
|
|
}
|
|
|
|
/// Sample ordinal data type.
|
|
class OrdinalSales {
|
|
final String year;
|
|
final int sales;
|
|
|
|
OrdinalSales(this.year, this.sales);
|
|
}
|