Custom

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 UserControl instance, but LiveCharts controls can be used inside any container.

sample image

View model

using System.Collections.Generic;
using LiveChartsCore;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;
using System;
using LiveChartsCore.SkiaSharpView.Extensions;

namespace ViewModelsSamples.Pies.Custom;

public partial class ViewModel : ObservableObject
{
    public ViewModel()
    {
        var outer = 0;
        var data = new[] { 6, 5, 4, 3 };

        // you can convert any array, list or IEnumerable<T> to a pie series collection:
        Series = data.AsPieSeries((value, series) =>
        {
            // this method is called once per element in the array, so:

            // for the series with the value 6, we set the OuterRadiusOffset to 0
            // for the series with the value 5, the OuterRadiusOffset is 50
            // for the series with the value 4, the OuterRadiusOffset is 100
            // for the series with the value 3, the OuterRadiusOffset is 150

            series.OuterRadiusOffset = outer;
            outer += 50;

            series.DataLabelsPaint = new SolidColorPaint(SKColors.White)
            {
                SKTypeface = SKTypeface.FromFamilyName("Arial", SKFontStyle.Bold)
            };

            series.ToolTipLabelFormatter =
                point =>
                {
                    var pv = point.Coordinate.PrimaryValue;
                    var sv = point.StackedValue!;

                    var a = $"{pv}/{sv.Total}{Environment.NewLine}{sv.Share:P2}";
                    return a;
                };

            series.DataLabelsFormatter =
                point =>
                {
                    var pv = point.Coordinate.PrimaryValue;
                    var sv = point.StackedValue!;

                    var a = $"{pv}/{sv.Total}{Environment.NewLine}{sv.Share:P2}";
                    return a;
                };
        });
    }

    public IEnumerable<ISeries> Series { get; set; }
}

XAML

<UserControl x:Class="UnoWinUISample.Pies.Custom.View"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:lvc="using:LiveChartsCore.SkiaSharpView.WinUI"
            xmlns:vms="using:ViewModelsSamples.Pies.Custom"
            mc:Ignorable="d">
    <UserControl.DataContext>
        <vms:ViewModel/>
    </UserControl.DataContext>
    <lvc:PieChart Series="{Binding Series}" InitialRotation="-90"/>
</UserControl>

Articles you might also find useful:

Pie chart control
pie series properties