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samples/web/charts/lib/bar_chart/custom_rounded_bars.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 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 CustomRoundedBars extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
CustomRoundedBars(this.seriesList, {this.animate});
/// Creates a [BarChart] with custom rounded bars.
factory CustomRoundedBars.withSampleData() {
return new CustomRoundedBars(
_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 CustomRoundedBars.withRandomData() {
return new CustomRoundedBars(_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)),
];
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,
defaultRenderer: new charts.BarRendererConfig(
// By default, bar renderer will draw rounded bars with a constant
// radius of 30.
// To not have any rounded corners, use [NoCornerStrategy]
// To change the radius of the bars, use [ConstCornerStrategy]
cornerStrategy: const charts.ConstCornerStrategy(30)),
);
}
/// 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),
];
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);
}