Radial Gradients

View Model

using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace ViewModelsSamples.Design.RadialGradients;

public partial class ViewModel : ObservableObject
{
    // radial gradients are based on SkiaSharp circular gradients
    // for more info please see:
    // https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/effects/shaders/circular-gradients

    private static readonly SKColor[] s_colors =
    {
        new SKColor(179, 229, 252),
        new SKColor(1, 87, 155)
        // ...

        // you can add as many colors as you require to build the gradient
        // by default all the distance between each color is equal
        // use the colorPos parameter in the constructor of the RadialGradientPaint class
        // to specify the distance between each color
    };

    public ISeries[] Series { get; set; } =
    {
        new PieSeries<int>
        {
            Name = "Maria",
            Values = new []{ 7 },
            Stroke = null,
            Fill = new RadialGradientPaint(s_colors),
            Pushout = 10,
            OuterRadiusOffset = 20
        },
        new PieSeries<int>
        {
            Name = "Charles",
            Values = new []{ 3 },
            Stroke = null,
            Fill = new RadialGradientPaint(new SKColor(255, 205, 210), new SKColor(183, 28, 28))
        }
    };
}

XAML

<UserControl
    x:Class="UnoWinUISample.Design.RadialGradients.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.Design.RadialGradients"
    mc:Ignorable="d">

    <UserControl.DataContext>
        <vms:ViewModel/>
    </UserControl.DataContext>
    <Grid>
        <lvc:PieChart Series="{Binding Series}" LegendPosition="Right"></lvc:PieChart>
    </Grid>
    
</UserControl>