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116 lines
3.6 KiB
116 lines
3.6 KiB
// Copyright 2018 the Charts project authors. Please see the AUTHORS file
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// for details.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/// Bar chart example
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// EXCLUDE_FROM_GALLERY_DOCS_START
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import 'dart:math';
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// EXCLUDE_FROM_GALLERY_DOCS_END
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import 'package:flutter/material.dart';
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import 'package:charts_flutter/flutter.dart' as charts;
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/// Example of flipping the vertical measure axis direction so that larger
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/// values render downward instead of the usual rendering up.
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///
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/// flipVerticalAxis, when set, flips the vertical axis from its default
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/// direction.
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///
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/// Note: primary and secondary may flip left and right positioning when
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/// RTL.flipAxisLocations is set.
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class FlippedVerticalAxis extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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const FlippedVerticalAxis(this.seriesList, {this.animate, Key key})
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: super(key: key);
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factory FlippedVerticalAxis.withSampleData() {
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return FlippedVerticalAxis(
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_createSampleData(),
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// Disable animations for image tests.
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animate: false,
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);
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}
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// EXCLUDE_FROM_GALLERY_DOCS_START
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// This section is excluded from being copied to the gallery.
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// It is used for creating random series data to demonstrate animation in
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// the example app only.
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factory FlippedVerticalAxis.withRandomData() {
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return FlippedVerticalAxis(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<RunnerRank, String>> _createRandomData() {
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final random = Random();
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const runners = ['Smith', 'Jones', 'Brown', 'Doe'];
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// Randomly assign runners, but leave the order of the places.
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final raceData = [
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RunnerRank(runners.removeAt(random.nextInt(runners.length)), 1),
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RunnerRank(runners.removeAt(random.nextInt(runners.length)), 2),
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RunnerRank(runners.removeAt(random.nextInt(runners.length)), 3),
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RunnerRank(runners.removeAt(random.nextInt(runners.length)), 4),
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];
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return [
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charts.Series<RunnerRank, String>(
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id: 'Race Results',
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domainFn: (RunnerRank row, _) => row.name,
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measureFn: (RunnerRank row, _) => row.place,
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data: raceData,
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),
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];
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}
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// EXCLUDE_FROM_GALLERY_DOCS_END
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// Known Issue, the bar chart cannot render negative direction bars at this
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// time so the result is an empty chart.
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// TODO: Remove this comment
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@override
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Widget build(BuildContext context) {
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return charts.BarChart(
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seriesList,
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animate: animate,
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flipVerticalAxis: true,
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);
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}
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/// Create series list with multiple series
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static List<charts.Series<RunnerRank, String>> _createSampleData() {
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final raceData = [
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RunnerRank('Smith', 1),
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RunnerRank('Jones', 2),
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RunnerRank('Brown', 3),
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RunnerRank('Doe', 4),
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];
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return [
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charts.Series<RunnerRank, String>(
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id: 'Race Results',
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domainFn: (RunnerRank row, _) => row.name,
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measureFn: (RunnerRank row, _) => row.place,
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data: raceData),
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];
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}
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}
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/// Datum/Row for the chart.
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class RunnerRank {
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final String name;
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final int place;
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RunnerRank(this.name, this.place);
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}
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