Custom S V G Scatter Points

View model

using System;
using System.Collections.ObjectModel;
using LiveChartsCore;
using LiveChartsCore.Defaults;
using LiveChartsCore.Drawing;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Drawing.Geometries;

namespace ViewModelsSamples.Scatter.Custom;

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

    public ViewModel()
    {
        var r = new Random();
        var values1 = new ObservableCollection<ObservablePoint>();
        var values2 = new ObservableCollection<ObservablePoint>();
        var values3 = new ObservableCollection<ObservablePoint>();

        for (var i = 0; i < 20; i++)
        {
            values1.Add(new ObservablePoint(r.Next(0, 20), r.Next(0, 20)));
            values2.Add(new ObservablePoint(r.Next(0, 20), r.Next(0, 20)));
            values3.Add(new ObservablePoint(r.Next(0, 20), r.Next(0, 20)));
        }

        Series = [
            // use the second generic parameter to define the geometry to draw
            // there are many predefined geometries in the LiveChartsCore.Drawing namespace
            // for example, the StarGeometry, CrossGeometry, RectangleGeometry and DiamondGeometry
            new ScatterSeries<ObservablePoint, HeartGeometry>
            {
                Values = values1,
                Stroke = null,
                GeometrySize = 40
            },

            // You can also use SVG paths to draw the geometry
            // the VariableSVGPathGeometry can change the drawn path at runtime
            new ScatterSeries<ObservablePoint, VariableSVGPathGeometry>
            {
                Values = values2,
                GeometrySvg = SVGPoints.Pin
            },

            // finally you can also use SkiaSharp to draw your own geometry
            new ScatterSeries<ObservablePoint, MyGeometry>
            {
                Values = values3,
                GeometrySize = 40,
            }
        ];
    }
}

MyGeometry.cs

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

namespace ViewModelsSamples.Scatter.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 += 10;
        }
    }
}

XAML

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="MauiSample.Scatter.Custom.View"
             xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:lvc="clr-namespace:LiveChartsCore.SkiaSharpView.Maui;assembly=LiveChartsCore.SkiaSharpView.Maui"
             xmlns:vms="clr-namespace:ViewModelsSamples.Scatter.Custom;assembly=ViewModelsSamples"
             >
    <ContentPage.BindingContext>
        <vms:ViewModel/>
    </ContentPage.BindingContext>
	<ContentPage.Content>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>

            <lvc:CartesianChart
                Series="{Binding Series}">
            </lvc:CartesianChart>
        </Grid>
    </ContentPage.Content>
</ContentPage>

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