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samples/web/charts/lib/i18n/rtl_line_chart.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.
/// RTL Line 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 RTLLineChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
const RTLLineChart(this.seriesList, {this.animate, Key key})
: super(key: key);
/// Creates a [LineChart] with sample data and no transition.
factory RTLLineChart.withSampleData() {
return RTLLineChart(
_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 RTLLineChart.withRandomData() {
return RTLLineChart(_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)),
LinearSales(3, random.nextInt(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) {
// Charts will determine if RTL is enabled by checking the directionality by
// requesting Directionality.of(context). This returns the text direction
// from the closest instance of that encloses the context passed to build
// the chart. A [TextDirection.rtl] will be treated as a RTL chart. This
// means that the directionality widget does not have to directly wrap each
// chart. It is show here as an example only.
//
// By default, when a chart detects RTL:
// Measure axis positions are flipped. Primary measure axis is on the right
// and the secondary measure axis is on the left (when used).
// Domain axis' first domain starts on the right and grows left.
return Directionality(
textDirection: TextDirection.rtl,
child: charts.LineChart(
seriesList,
animate: animate,
));
}
/// 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);
}