Crosshairs

This sample uses C# 13 preview features such as partial properties, it also uses features from the CommunityToolkit.Mvvm package, you can learn more about it here.

sample image

View model

using System;

namespace ViewModelsSamples.Axes.Crosshairs;

public class ViewModel
{
    public double[] Values { get; set; } =
        [200, 558, 458, 249, 457, 339, 587];

    public Func<double, string> LabelFormatter { get; set; } =
        value => value.ToString("N2");
}

XAML

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="MauiSample.Axes.Crosshairs.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.Axes.Crosshairs;assembly=ViewModelsSamples"
    x:DataType="vms:ViewModel">

    <ContentPage.BindingContext>
        <vms:ViewModel/>
    </ContentPage.BindingContext>

    <lvc:CartesianChart>

        <lvc:CartesianChart.Series>
            <lvc:SeriesCollection>
                <lvc:XamlLineSeries Values="{Binding Values}" />
            </lvc:SeriesCollection>
        </lvc:CartesianChart.Series>

        <lvc:CartesianChart.XAxes>
            <lvc:AxesCollection>
                <lvc:XamlAxis
                    CrosshairLabelsBackground="#FF8C00"
                    CrosshairLabelsPaint="#8B0000"
                    CrosshairPaint="#FF8C00"
                    Labeler="{Binding LabelFormatter}"/>
            </lvc:AxesCollection>
        </lvc:CartesianChart.XAxes>
        
        <lvc:CartesianChart.YAxes>
            <lvc:AxesCollection>
                <lvc:XamlAxis
                    CrosshairLabelsBackground="#FF8C00"
                    CrosshairLabelsPaint="#8B0000"
                    CrosshairPaint="#FF8C00"
                    CrosshairSnapEnabled="True"
                    Labeler="{Binding LabelFormatter}"/>
            </lvc:AxesCollection>
        </lvc:CartesianChart.YAxes>

    </lvc:CartesianChart>
</ContentPage>

Articles you might also find useful:

Cartesian chart control
Axes properties
Line series properties