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123 lines
4.3 KiB
123 lines
4.3 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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/// Example of timeseries chart with a custom number of ticks
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///
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/// The tick count can be set by setting the [desiredMinTickCount] and
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/// [desiredMaxTickCount] for automatically adjusted tick counts (based on
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/// how 'nice' the ticks are) or [desiredTickCount] for a fixed tick count.
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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:charts_flutter/flutter.dart' as charts;
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import 'package:flutter/material.dart';
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class CustomMeasureTickCount extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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CustomMeasureTickCount(this.seriesList, {this.animate});
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/// Creates a [TimeSeriesChart] with sample data and no transition.
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factory CustomMeasureTickCount.withSampleData() {
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return new CustomMeasureTickCount(
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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 CustomMeasureTickCount.withRandomData() {
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return new CustomMeasureTickCount(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<MyRow, DateTime>> _createRandomData() {
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final random = new Random();
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final data = [
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new MyRow(new DateTime(2017, 9, 25), random.nextInt(100)),
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new MyRow(new DateTime(2017, 9, 26), random.nextInt(100)),
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new MyRow(new DateTime(2017, 9, 27), random.nextInt(100)),
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new MyRow(new DateTime(2017, 9, 28), random.nextInt(100)),
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new MyRow(new DateTime(2017, 9, 29), random.nextInt(100)),
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new MyRow(new DateTime(2017, 9, 30), random.nextInt(100)),
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new MyRow(new DateTime(2017, 10, 01), random.nextInt(100)),
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new MyRow(new DateTime(2017, 10, 02), random.nextInt(100)),
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new MyRow(new DateTime(2017, 10, 03), random.nextInt(100)),
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new MyRow(new DateTime(2017, 10, 04), random.nextInt(100)),
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new MyRow(new DateTime(2017, 10, 05), random.nextInt(100)),
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];
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return [
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new charts.Series<MyRow, DateTime>(
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id: 'Cost',
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domainFn: (MyRow row, _) => row.timeStamp,
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measureFn: (MyRow row, _) => row.cost,
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data: data,
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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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@override
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Widget build(BuildContext context) {
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return new charts.TimeSeriesChart(seriesList,
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animate: animate,
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/// Customize the measure axis to have 2 ticks,
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primaryMeasureAxis: new charts.NumericAxisSpec(
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tickProviderSpec:
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new charts.BasicNumericTickProviderSpec(desiredTickCount: 2)));
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}
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/// Create one series with sample hard coded data.
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static List<charts.Series<MyRow, DateTime>> _createSampleData() {
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final data = [
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new MyRow(new DateTime(2017, 9, 25), 6),
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new MyRow(new DateTime(2017, 9, 26), 8),
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new MyRow(new DateTime(2017, 9, 27), 6),
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new MyRow(new DateTime(2017, 9, 28), 9),
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new MyRow(new DateTime(2017, 9, 29), 11),
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new MyRow(new DateTime(2017, 9, 30), 15),
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new MyRow(new DateTime(2017, 10, 01), 25),
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new MyRow(new DateTime(2017, 10, 02), 33),
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new MyRow(new DateTime(2017, 10, 03), 27),
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new MyRow(new DateTime(2017, 10, 04), 31),
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new MyRow(new DateTime(2017, 10, 05), 23),
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];
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return [
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new charts.Series<MyRow, DateTime>(
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id: 'Cost',
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domainFn: (MyRow row, _) => row.timeStamp,
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measureFn: (MyRow row, _) => row.cost,
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data: data,
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)
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];
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}
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}
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/// Sample time series data type.
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class MyRow {
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final DateTime timeStamp;
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final int cost;
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MyRow(this.timeStamp, this.cost);
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}
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