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samples/web/charts/lib/axes/short_tick_length_axis.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.
/// Custom Tick Style Example
// EXCLUDE_FROM_GALLERY_DOCS_START
import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:flutter/material.dart';
import 'package:charts_flutter/flutter.dart' as charts;
/// Example of using a custom primary measure axis replacing the default
/// gridline rendering with a short tick rendering. It also turns on the axis
/// line so that the ticks have something to line up against.
///
/// There are many axis styling options in the SmallTickRenderer allowing you
/// to customize the font, tick lengths, and offsets.
class ShortTickLengthAxis extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
const ShortTickLengthAxis(this.seriesList, {this.animate, Key key})
: super(key: key);
factory ShortTickLengthAxis.withSampleData() {
return ShortTickLengthAxis(
_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 ShortTickLengthAxis.withRandomData() {
return ShortTickLengthAxis(_createRandomData());
}
/// Create random data.
static List<charts.Series<OrdinalSales, String>> _createRandomData() {
final random = Random();
final globalSalesData = [
OrdinalSales('2014', random.nextInt(100) * 100),
OrdinalSales('2015', random.nextInt(100) * 100),
OrdinalSales('2016', random.nextInt(100) * 100),
OrdinalSales('2017', random.nextInt(100) * 100),
];
return [
charts.Series<OrdinalSales, String>(
id: 'Global Revenue',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: globalSalesData,
),
];
}
// EXCLUDE_FROM_GALLERY_DOCS_END
@override
Widget build(BuildContext context) {
return charts.BarChart(
seriesList,
animate: animate,
/// Customize the primary measure axis using a small tick renderer.
/// Note: use String instead of num for ordinal domain axis
/// (typically bar charts).
primaryMeasureAxis: const charts.NumericAxisSpec(
renderSpec: charts.SmallTickRendererSpec(
// Tick and Label styling here.
)),
);
}
/// Create series list with single series
static List<charts.Series<OrdinalSales, String>> _createSampleData() {
final globalSalesData = [
OrdinalSales('2014', 5000),
OrdinalSales('2015', 25000),
OrdinalSales('2016', 100000),
OrdinalSales('2017', 750000),
];
return [
charts.Series<OrdinalSales, String>(
id: 'Global Revenue',
domainFn: (OrdinalSales sales, _) => sales.year,
measureFn: (OrdinalSales sales, _) => sales.sales,
data: globalSalesData,
),
];
}
}
/// Sample ordinal data type.
class OrdinalSales {
final String year;
final int sales;
OrdinalSales(this.year, this.sales);
}