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120 lines
4.3 KiB
120 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 that has a measure axis that does NOT include
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/// zero. It starts at 100 and goes to 140.
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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 NonzeroBoundMeasureAxis extends StatelessWidget {
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final List<charts.Series> seriesList;
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final bool animate;
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NonzeroBoundMeasureAxis(this.seriesList, {this.animate});
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/// Creates a [TimeSeriesChart] with sample data and no transition.
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factory NonzeroBoundMeasureAxis.withSampleData() {
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return new NonzeroBoundMeasureAxis(
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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 NonzeroBoundMeasureAxis.withRandomData() {
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return new NonzeroBoundMeasureAxis(_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) + 100),
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new MyRow(new DateTime(2017, 9, 26), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 9, 27), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 9, 28), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 9, 29), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 9, 30), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 10, 01), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 10, 02), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 10, 03), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 10, 04), random.nextInt(100) + 100),
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new MyRow(new DateTime(2017, 10, 05), random.nextInt(100) + 100),
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];
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return [
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new charts.Series<MyRow, DateTime>(
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id: 'Headcount',
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domainFn: (MyRow row, _) => row.timeStamp,
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measureFn: (MyRow row, _) => row.headcount,
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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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// Provide a tickProviderSpec which does NOT require that zero is
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// included.
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primaryMeasureAxis: new charts.NumericAxisSpec(
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tickProviderSpec:
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new charts.BasicNumericTickProviderSpec(zeroBound: false)));
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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), 106),
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new MyRow(new DateTime(2017, 9, 26), 108),
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new MyRow(new DateTime(2017, 9, 27), 106),
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new MyRow(new DateTime(2017, 9, 28), 109),
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new MyRow(new DateTime(2017, 9, 29), 111),
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new MyRow(new DateTime(2017, 9, 30), 115),
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new MyRow(new DateTime(2017, 10, 01), 125),
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new MyRow(new DateTime(2017, 10, 02), 133),
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new MyRow(new DateTime(2017, 10, 03), 127),
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new MyRow(new DateTime(2017, 10, 04), 131),
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new MyRow(new DateTime(2017, 10, 05), 123),
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];
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return [
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new charts.Series<MyRow, DateTime>(
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id: 'Headcount',
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domainFn: (MyRow row, _) => row.timeStamp,
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measureFn: (MyRow row, _) => row.headcount,
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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 headcount;
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MyRow(this.timeStamp, this.headcount);
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}
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