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samples/web/charts/lib/axes/flipped_vertical_axis.dart

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3.6 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.
/// Bar chart 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 flipping the vertical measure axis direction so that larger
/// values render downward instead of the usual rendering up.
///
/// flipVerticalAxis, when set, flips the vertical axis from its default
/// direction.
///
/// Note: primary and secondary may flip left and right positioning when
/// RTL.flipAxisLocations is set.
class FlippedVerticalAxis extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
FlippedVerticalAxis(this.seriesList, {this.animate});
factory FlippedVerticalAxis.withSampleData() {
return new FlippedVerticalAxis(
_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 FlippedVerticalAxis.withRandomData() {
return new FlippedVerticalAxis(_createRandomData());
}
/// Create random data.
static List<charts.Series<RunnerRank, String>> _createRandomData() {
final random = new Random();
const runners = ['Smith', 'Jones', 'Brown', 'Doe'];
// Randomly assign runners, but leave the order of the places.
final raceData = [
new RunnerRank(runners.removeAt(random.nextInt(runners.length)), 1),
new RunnerRank(runners.removeAt(random.nextInt(runners.length)), 2),
new RunnerRank(runners.removeAt(random.nextInt(runners.length)), 3),
new RunnerRank(runners.removeAt(random.nextInt(runners.length)), 4),
];
return [
new charts.Series<RunnerRank, String>(
id: 'Race Results',
domainFn: (RunnerRank row, _) => row.name,
measureFn: (RunnerRank row, _) => row.place,
data: raceData,
),
];
}
// EXCLUDE_FROM_GALLERY_DOCS_END
// Known Issue, the bar chart cannot render negative direction bars at this
// time so the result is an empty chart.
// TODO: Remove this comment
@override
Widget build(BuildContext context) {
return new charts.BarChart(
seriesList,
animate: animate,
flipVerticalAxis: true,
);
}
/// Create series list with multiple series
static List<charts.Series<RunnerRank, String>> _createSampleData() {
final raceData = [
new RunnerRank('Smith', 1),
new RunnerRank('Jones', 2),
new RunnerRank('Brown', 3),
new RunnerRank('Doe', 4),
];
return [
new charts.Series<RunnerRank, String>(
id: 'Race Results',
domainFn: (RunnerRank row, _) => row.name,
measureFn: (RunnerRank row, _) => row.place,
data: raceData),
];
}
}
/// Datum/Row for the chart.
class RunnerRank {
final String name;
final int place;
RunnerRank(this.name, this.place);
}