Customize Visuals

View Model

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

namespace ViewModelsSamples.General.MapPoints;

public partial class ViewModel : ObservableObject
{
    public ViewModel()
    {
        var paints = new SolidColorPaint[]
        {
            new(SKColors.Red),
            new(SKColors.Green),
            new(SKColors.Blue),
            new(SKColors.Yellow)
        };

        var series = new ColumnSeries<int>
        {
            Values = new[] { 2, 5, 4, 6, 8, 3, 2, 4, 6 },
            DataLabelsPaint = new SolidColorPaint(new SKColor(30, 30, 30)),
            DataLabelsPosition = DataLabelsPosition.Top
        }
        .OnPointMeasured(point =>
        {
            // this method is called for each point in the series
            // we can customize the visual here

            if (point.Visual is null) return;

            // get a paint from the array
            var paint = paints[point.Index % paints.Length];
            // set the paint to the visual
            point.Visual.Fill = paint;
        });

        Series = new ISeries[] { series };
    }

    public ISeries[] Series { get; set; }
}

XAML

<UserControl
    x:Class="UnoWinUISample.General.MapPoints.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.General.MapPoints"
    mc:Ignorable="d">

    <UserControl.DataContext>
        <vms:ViewModel/>
    </UserControl.DataContext>

    <lvc:CartesianChart Series="{Binding Series}"></lvc:CartesianChart>

</UserControl>

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