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

sample image

View model

using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.Drawing;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Drawing.Geometries;

namespace ViewModelsSamples.Bars.Custom;

public partial class ViewModel : ObservableObject
{
    public ISeries[] Series { get; set; } =
        {
            new ColumnSeries<double>
            {
                Values = new double[] { 2, 1, 4},
            },

            // You can also use SVG paths to draw the geometry
            // LiveCharts already provides some predefined paths in the SVGPoints class.
            new ColumnSeries<double, SVGPathGeometry>
            {
                Values = new double[] { -2, 2, 1 },
                GeometrySvg = SVGPoints.Star
            },

            // you can declare your own gemetry and use the SkiaSharp api to draw it
            new ColumnSeries<double, MyGeometry>
            {
                Values = new double[] { 4, 5, 2 },
            },
        };
}

MyGeometry.cs

using LiveChartsCore.SkiaSharpView.Drawing;
using LiveChartsCore.SkiaSharpView.Drawing.Geometries;
using SkiaSharp;

namespace ViewModelsSamples.Bars.Custom;

public class MyGeometry : SizedGeometry
{
    public override void OnDraw(SkiaSharpDrawingContext context, SKPaint paint)
    {
        var canvas = context.Canvas;
        var y = Y;

        while (y < Y + Height)
        {
            canvas.DrawLine(X, y, X + Width, y, paint);
            y += 5;
        }
    }
}

XAML

<UserControl
    x:Class="UnoWinUISample.Bars.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.Bars.Custom"
    mc:Ignorable="d">

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

Articles you might also find useful:

Cartesian chart control
Column series properties