Error Bars
The [ObservableObject], [ObservableProperty] and [RelayCommand] attributes come from the
CommunityToolkit.Mvvm package, you can read more about it
here.
This web site wraps every sample using a ContentPage instance, but LiveCharts controls can be used inside any container.
View model
using System;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.Defaults;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Drawing.Geometries;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;
namespace ViewModelsSamples.Error.Basic;
public partial class ViewModel : ObservableObject
{
public ViewModel()
{
// use the ErrorValue type to define the error in Y // mark
var values0 = new ErrorValue[]
{
// (Y, Y+- error) // mark
new(65, 6),
// (Y, Y+ error, Y- error) // mark
new(70, 15, 4),
new(35, 4),
new(70, 6),
new(30, 5),
new(60, 4, 16),
new(65, 6)
};
// When you need to define the error in X and Y use the ErrorPoint type // mark
var values1 = new ErrorPoint[]
{
// (X, Y, Y+- error, Y+- error) // mark
new(0, 50, 0.2, 8),
// (X, Y, X- error, X+ erorr, Y+ error, Y- error) // mark
new(1, 45, 0.1, 0.3, 15, 4),
new(2, 25, 0.3, 4),
new(3, 30, 0.2, 6),
new(4, 70, 0.2, 8),
new(5, 30, 0.4, 4),
new(6, 50, 0.3, 6)
};
Series0 = new ISeries[]
{
new ColumnSeries<ErrorValue>
{
Values = values0,
ErrorPaint = new SolidColorPaint(SKColors.Black),
Padding = 0
},
new ColumnSeries<ErrorPoint>
{
Values = values1,
ErrorPaint = new SolidColorPaint(SKColors.Black),
Padding = 0
}
};
// LineSeries also supports error bars // mark
Series1 = new ISeries[]
{
new LineSeries<ErrorValue, RectangleGeometry>
{
Values = values0,
ErrorPaint = new SolidColorPaint(SKColors.Black),
GeometrySize = 4,
Fill = null
}
};
// You can also use DateTime on the X axis // mark
var now = DateTime.Now;
var values2 = new ErrorDateTimePoint[]
{
// (X, Y, Y+- error, Y+- error) // mark
new(now.AddDays(0), 50, 0.2, 8),
// (X, Y, X- error, X+ erorr, Y+ error, Y- error) // mark
new(now.AddDays(1), 45, 0.1, 0.3, 15, 4),
new(now.AddDays(2), 25, 0.3, 4),
new(now.AddDays(3), 30, 0.2, 6),
new(now.AddDays(4), 70, 0.2, 8),
new(now.AddDays(5), 30, 0.4, 4),
new(now.AddDays(6), 50, 0.3, 6)
};
// ScatterSeries also supports error bars // mark
Series2 = new ISeries[]
{
new ScatterSeries<ErrorDateTimePoint>
{
Values = values2,
ErrorPaint = new SolidColorPaint(SKColors.Black),
GeometrySize = 10
}
};
}
public ISeries[] Series0 { get; set; }
public ISeries[] Series1 { get; set; }
public ISeries[] Series2 { get; set; }
// To get more help about DateTime axes see:
// https://livecharts.dev/docs/{{ platform }}/{{ version }}/samples.axes.dateTimeScaled
public Axis[] DateTimeAxis { get; set; } =
{
new DateTimeAxis(TimeSpan.FromDays(1), date => date.ToString("MMMM dd"))
};
}
XAML
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="MauiSample.Error.Basic.View"
xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:lvc="clr-namespace:LiveChartsCore.SkiaSharpView.Maui;assembly=LiveChartsCore.SkiaSharpView.Maui"
xmlns:vms="clr-namespace:ViewModelsSamples.Error.Basic;assembly=ViewModelsSamples">
<ContentPage.BindingContext>
<vms:ViewModel/>
</ContentPage.BindingContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<lvc:CartesianChart
Grid.Row="0"
Series="{Binding Series0}">
</lvc:CartesianChart>
<lvc:CartesianChart
Grid.Row="1"
Series="{Binding Series1}">
</lvc:CartesianChart>
<lvc:CartesianChart
Grid.Row="2"
Series="{Binding Series2}"
XAxes="{Binding DateTimeAxis}">
</lvc:CartesianChart>
</Grid>
</ContentPage>
