Radial Area

sample image

View model

using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace ViewModelsSamples.Polar.RadialArea;

public class ViewModel
{
    public ISeries[] Series { get; set; }
        = {
            new PolarLineSeries<int>
            {
                Values = new[] { 7, 5, 7, 5, 6 },
                LineSmoothness = 0,
                GeometrySize= 0,
                Fill = new SolidColorPaint(SKColors.Blue.WithAlpha(90))
            },
            new PolarLineSeries<int>
            {
                Values = new[] { 2, 7, 5, 9, 7 },
                LineSmoothness = 1,
                GeometrySize = 0,
                Fill = new SolidColorPaint(SKColors.Red.WithAlpha(90))
            }
        };

    public PolarAxis[] AngleAxes { get; set; }
        = {
            new PolarAxis
            {
                LabelsRotation = LiveCharts.TangentAngle,
                Labels = new[] { "first", "second", "third", "forth", "fifth" }
            }
        };
}

XAML

<UserControl x:Class="WinUISample.Polar.RadialArea.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.Polar.RadialArea"
            mc:Ignorable="d">
    <UserControl.DataContext>
        <vms:ViewModel/>
    </UserControl.DataContext>
    <lvc:PolarChart Series="{Binding Series}" AngleAxes="{Binding AngleAxes}" InitialRotation="-45" />
</UserControl>

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Polar chart control
Polar series properties