Flutter 颤振图日期时间图概括日期太多
我在我的项目()中使用了一个颤振图,在我的数据库中,我有非常精确的时间,但是软件包将其简化,并将日期概括得比我想要的更多。我能想到两个选择,但我都不知道怎么做。1:将程序包设置为打印更精确的时间,或2:隐藏或删除x轴标签,以便生成自己的时间。谢谢您的帮助,谢谢Flutter 颤振图日期时间图概括日期太多,flutter,dart,Flutter,Dart,我在我的项目()中使用了一个颤振图,在我的数据库中,我有非常精确的时间,但是软件包将其简化,并将日期概括得比我想要的更多。我能想到两个选择,但我都不知道怎么做。1:将程序包设置为打印更精确的时间,或2:隐藏或删除x轴标签,以便生成自己的时间。谢谢您的帮助,谢谢 使用domainAxis属性并设置TimeFormatterSpec 下图显示了transitionFormat:'dd MM'和transitionFormat:'dd MMM' 您可以复制粘贴运行下面的完整代码 代码片段 @overr
使用
domainAxis
属性并设置TimeFormatterSpec
下图显示了
transitionFormat:'dd MM'
和transitionFormat:'dd MMM'
您可以复制粘贴运行下面的完整代码代码片段
@override
Widget build(BuildContext context) {
return new charts.TimeSeriesChart(
seriesList,
animate: animate,
// Optionally pass in a [DateTimeFactory] used by the chart. The factory
// should create the same type of [DateTime] as the data provided. If none
// specified, the default creates local date time.
dateTimeFactory: const charts.LocalDateTimeFactory(),
domainAxis: charts.DateTimeAxisSpec(
tickFormatterSpec: charts.AutoDateTimeTickFormatterSpec(
day: charts.TimeFormatterSpec(
format: 'dd',
transitionFormat: 'dd MMM',
),
),
),
);
}
演示dd-MM和dd-MMM
完整代码
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class SimpleTimeSeriesChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
SimpleTimeSeriesChart(this.seriesList, {this.animate});
/// Creates a [TimeSeriesChart] with sample data and no transition.
factory SimpleTimeSeriesChart.withSampleData() {
return new SimpleTimeSeriesChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
return new charts.TimeSeriesChart(
seriesList,
animate: animate,
// Optionally pass in a [DateTimeFactory] used by the chart. The factory
// should create the same type of [DateTime] as the data provided. If none
// specified, the default creates local date time.
dateTimeFactory: const charts.LocalDateTimeFactory(),
domainAxis: charts.DateTimeAxisSpec(
tickFormatterSpec: charts.AutoDateTimeTickFormatterSpec(
day: charts.TimeFormatterSpec(
format: 'dd',
transitionFormat: 'dd MMM',
),
),
),
);
}
/// Create one series with sample hard coded data.
static List<charts.Series<TimeSeriesSales, DateTime>> _createSampleData() {
final data = [
new TimeSeriesSales(new DateTime(2017, 9, 19), 5),
new TimeSeriesSales(new DateTime(2017, 9, 26), 25),
new TimeSeriesSales(new DateTime(2017, 10, 3), 100),
new TimeSeriesSales(new DateTime(2017, 10, 10), 75),
];
return [
new charts.Series<TimeSeriesSales, DateTime>(
id: 'Sales',
colorFn: (_, __) => charts.MaterialPalette.blue.shadeDefault,
domainFn: (TimeSeriesSales sales, _) => sales.time,
measureFn: (TimeSeriesSales sales, _) => sales.sales,
data: data,
)
];
}
}
/// Sample time series data type.
class TimeSeriesSales {
final DateTime time;
final int sales;
TimeSeriesSales(this.time, this.sales);
}
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(flex: 5, child: SimpleTimeSeriesChart.withSampleData()),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
import'包:图表_flatter/flatter.dart'作为图表;
进口“包装:颤振/材料.省道”;
类SimpleTimesRiesChart扩展了无状态小部件{
最终清单系列清单;
最后的布尔动画;
SimpleTimeSeriesChart(this.seriesList,{this.animate});
///创建带有样本数据且无转换的[TimeSeriesChart]。
工厂SimpleTimeriesChart.with采样数据(){
返回新的SimpleTimeriesChart(
_createSampleData(),
//禁用图像测试的动画。
动画:假,
);
}
@凌驾
小部件构建(构建上下文){
返回新图表。TimeSeriesChart(
系列列表,
动画制作:动画制作,
//可选地传入图表使用的[DateTimeFactory]。工厂
//应创建与提供的数据相同类型的[DateTime]。如果没有
//指定时,默认值将创建本地日期时间。
dateTimeFactory:const charts.LocalDateTimeFactory(),
domainAxis:charts.DateTimeAxisSpec(
tickFormatterSpec:charts.AutoDateTimeTickFormatterSpec(
日期:charts.TimeFormatterSpec(
格式:'dd',
转换格式:“dd MMM”,
),
),
),
);
}
///使用示例硬编码数据创建一个系列。
静态列表_createSampleData(){
最终数据=[
新时间系列(新日期时间(2017年9月19日),5),
新时间系列(新日期时间(2017年9月26日),25日),
新时间系列(新日期时间(2017年10月3日),100),
新时间系列(新日期时间(2017,10,10,75),
];
返回[
新图表系列(
id:'销售',
颜色fn:(u,uu)=>charts.materialpalete.blue.shadedfault,
domainFn:(TimeSeriesSales sales,)=>sales.time,
measureFn:(TimeSeriesSales sales,)=>sales.sales,
数据:数据,
)
];
}
}
///时间序列数据类型示例。
课堂时间体验{
最终日期时间;
最终销售;
TimeSeriesSales(this.time,this.sales);
}
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
//此小部件是应用程序的根。
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
//这是应用程序的主题。
//
//尝试使用“flutter run”运行应用程序。您将看到
//应用程序有一个蓝色工具栏。然后,在不退出应用程序的情况下,重试
//将下面的primarySwatch更改为Colors.green,然后调用
//“热重新加载”(在运行“颤振运行”的控制台中按“r”,
//或者只需将更改保存到颤振IDE中的“热重新加载”。
//请注意,计数器没有重置回零;应用程序
//未重新启动。
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
//此小部件是应用程序的主页。它是有状态的,表示
//它有一个状态对象(定义如下),其中包含影响
//看起来怎么样。
//此类是状态的配置。它保存值(在此
//案例名称)由家长(在本例中为应用程序小部件)提供,以及
//由State的build方法使用。小部件子类中的字段包括
//始终标记为“最终”。
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
int _计数器=0;
void _incrementCounter(){
设置状态(){
//这个对setState的调用告诉颤振框架,某些东西
//已在此状态下更改,这将导致它重新运行下面的生成方法
//以便显示能够反映更新的值。如果我们更改
//_计数器,而不调用setState(),则生成方法将不可用
//再打一次电话,似乎什么也没发生。
_计数器++;
});
}
@凌驾
小部件构建(构建上下文){
//每次调用setState时都会重新运行此方法,例如,按done
//通过上面的_incrementCounter方法。
//
//对颤振框架进行了优化,以制定重新运行的构建方法
//快速,这样你就可以重建任何需要更新的东西
//而不是必须单独更改小部件的实例。
返回脚手架(
appBar:appBar(
//在这里,我们从MyHomePage对象中获取由创建的值
//使用App.build方法,并使用它设置appbar标题。
标题:文本(widget.title),
),
正文:中(
//中心是一个布局小部件。它接受一个子元素并对其进行定位
/在父母的中间。
子:列(
//Column也是一个布局小部件,它包含一系列子项和子项
//垂直排列。默认情况下,它会调整自身大小以适应其位置
//孩子们水平移动,并试图和父母一样高。
//
//调用“调试绘制”(在控制台中按“p”,选择
//“切换调试痛苦