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Added the sample
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‎SfChartMultipleTrackball/SfChartMultipleTrackball.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.11.35327.3
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SfChartMultipleTrackball", "SfChartMultipleTrackball\SfChartMultipleTrackball.csproj", "{E5B30519-D065-42FC-B89A-B435C07011D9}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{E5B30519-D065-42FC-B89A-B435C07011D9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{E5B30519-D065-42FC-B89A-B435C07011D9}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E5B30519-D065-42FC-B89A-B435C07011D9}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E5B30519-D065-42FC-B89A-B435C07011D9}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {0CA07FB0-0F65-49F3-AFCC-11C28CE1D119}
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EndGlobalSection
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EndGlobal

‎SfChartMultipleTrackball/SfChartMultipleTrackball/App.xaml‎

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<Application x:Class="SfChartMultipleTrackball.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:SfChartMultipleTrackball"
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StartupUri="MainWindow.xaml">
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<Application.Resources>
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</Application.Resources>
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</Application>

‎SfChartMultipleTrackball/SfChartMultipleTrackball/App.xaml.cs‎

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using System.Configuration;
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using System.Data;
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using System.Windows;
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namespace SfChartMultipleTrackball
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{
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/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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{
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}
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}

‎SfChartMultipleTrackball/SfChartMultipleTrackball/AssemblyInfo.cs‎

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using System.Windows;
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[assembly: ThemeInfo(
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ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
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//(used if a resource is not found in the page,
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// or application resource dictionaries)
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ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
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//(used if a resource is not found in the page,
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// app, or any theme specific resource dictionaries)
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)]

‎SfChartMultipleTrackball/SfChartMultipleTrackball/MainWindow.xaml‎

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<Window x:Class="SfChartMultipleTrackball.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:local="clr-namespace:SfChartMultipleTrackball"
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mc:Ignorable="d"
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Title="MainWindow" Height="450" Width="800"
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xmlns:chart="clr-namespace:Syncfusion.UI.Xaml.Charts;assembly=Syncfusion.SfChart.WPF">
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<Grid>
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<chart:SfChart x:Name="chart" Header="Server CPU load by Day">
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<chart:SfChart.PrimaryAxis>
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<chart:CategoryAxis ShowTrackBallInfo="True"/>
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</chart:SfChart.PrimaryAxis>
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<chart:SfChart.SecondaryAxis>
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<chart:NumericalAxis ShowTrackBallInfo="True" Minimum="0" Maximum="100"/>
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</chart:SfChart.SecondaryAxis>
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<chart:SfChart.Resources>
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<Style TargetType="chart:ChartTrackBallControl" x:Key="trackballStyle1">
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<Setter Property="Background" Value="GreenYellow"/>
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<Setter Property="Height" Value="10"/>
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<Setter Property="Width" Value="10"/>
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</Style>
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<Style TargetType="Line" x:Key="lineStyle1">
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<Setter Property="Stroke" Value="Black"/>
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<Setter Property="StrokeThickness" Value="1.5"/>
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</Style>
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<Style TargetType="chart:ChartTrackBallControl" x:Key="trackballStyle2">
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<Setter Property="Background" Value="Orange"/>
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<Setter Property="Height" Value="10"/>
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<Setter Property="Width" Value="10"/>
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</Style>
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<Style TargetType="Line" x:Key="lineStyle2">
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<Setter Property="Stroke" Value="Black"/>
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<Setter Property="StrokeThickness" Value="1.5"/>
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</Style>
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</chart:SfChart.Resources>
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<chart:SfChart.Behaviors>
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<local:ChartTrackBallBehaviorExt x:Name="trackball1" ChartTrackBallStyle="{StaticResource trackballStyle1}" UseSeriesPalette="True" LineStyle="{StaticResource lineStyle1}"/>
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<local:ChartTrackBallBehaviorExt x:Name="trackball2" ChartTrackBallStyle="{StaticResource trackballStyle2}" UseSeriesPalette="True" LineStyle="{StaticResource lineStyle2}"/>
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</chart:SfChart.Behaviors>
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<chart:LineSeries ItemsSource="{Binding Data}" XBindingPath="Day" YBindingPath="CPULoad" StrokeThickness="3" Interior="OrangeRed">
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<chart:LineSeries.AdornmentsInfo>
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<chart:ChartAdornmentInfo Symbol="Ellipse" SymbolInterior="White" SymbolStroke="OrangeRed"/>
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</chart:LineSeries.AdornmentsInfo>
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</chart:LineSeries>
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</chart:SfChart>
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</Grid>
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<Window.DataContext>
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<local:ViewModel/>
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</Window.DataContext>
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</Window>

‎SfChartMultipleTrackball/SfChartMultipleTrackball/MainWindow.xaml.cs‎

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using Syncfusion.UI.Xaml.Charts;
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using System.Reflection;
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using System.Windows;
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using System.Windows.Input;
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namespace SfChartMultipleTrackball
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{
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/// <summary>
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/// Interaction logic for MainWindow.xaml
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/// </summary>
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public partial class MainWindow : Window
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{
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public MainWindow()
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{
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InitializeComponent();
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trackball1.SfChart = this.chart;
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trackball2.SfChart = this.chart;
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}
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protected override void OnContentRendered(EventArgs e)
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{
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base.OnContentRendered(e);
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// Run the ShowTrackball method asynchronously
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Task.Run(async () =>
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{
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await ShowTrackball();
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});
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}
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async Task ShowTrackball()
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{
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// Wait for 1 second before executing the rest of the method
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await Task.Delay(1000);
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Application.Current.Dispatcher.Invoke(() =>
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{
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// Calculated positions for the first trackball
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float xPosition = (float)chart.ValueToPoint(chart.PrimaryAxis, 1);
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float yPosition = (float)chart.ValueToPoint(chart.SecondaryAxis, 169);
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// Calculated positions for the second trackball
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float xPosition1 = (float)chart.ValueToPoint(chart.PrimaryAxis, 6);
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float yPosition1 = (float)chart.ValueToPoint(chart.SecondaryAxis, 170);
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// Display the first trackball
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trackball1.Display(xPosition, yPosition);
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// Display the second trackball
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trackball2.Display(xPosition1, yPosition1);
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});
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}
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}
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public class Model
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{
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public string Day { get; set; }
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public double CPULoad { get; set; }
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}
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public class ViewModel
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{
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public List<Model> Data { get; set; }
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public ViewModel()
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{
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Data = new List<Model>
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{
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new Model { Day = "Monday", CPULoad = 35 },
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new Model { Day = "Tuesday", CPULoad = 42 },
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new Model { Day = "Wednesday", CPULoad = 18 },
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new Model { Day = "Thursday", CPULoad = 30 },
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new Model { Day = "Friday", CPULoad = 64 },
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new Model { Day = "Saturday", CPULoad = 22 },
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new Model { Day = "Sunday", CPULoad = 10 }
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};
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}
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}
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public class ChartTrackBallBehaviorExt : ChartTrackBallBehavior
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{
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private bool isTrackballActive = false;
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public SfChart SfChart { get; set; }
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public double X { get; set; }
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public double Y { get; set; }
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protected override void OnMouseEnter(MouseEventArgs e)
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{
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// Get the position of the mouse pointer
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var touchPoint = e.GetPosition(null);
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// Find the nearest trackball to the mouse pointer
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var trackball = FindNearestTrackball(touchPoint);
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// Activate the trackball if it is the nearest one
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if (trackball == this)
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{
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isTrackballActive = true;
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base.OnMouseEnter(e);
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}
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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// Check if the trackball is activated
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if (isTrackballActive)
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{
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// Get the position of the mouse pointer
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var touchPoint = e.GetPosition(null);
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// Display the trackball at the current mouse position
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Display((float)touchPoint.X, (float)touchPoint.Y);
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base.OnMouseMove(e);
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}
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}
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protected override void OnMouseLeave(MouseEventArgs e)
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{
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// Deactivate the trackball
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isTrackballActive = false;
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}
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private ChartTrackBallBehavior FindNearestTrackball(Point touchPoint)
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{
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ChartTrackBallBehavior nearestTrackball = null;
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double minDistance = double.MaxValue;
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// Iterate through all trackball behaviors to find the nearest one
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foreach (var trackballBehaviour in SfChart.Behaviors)
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{
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if (trackballBehaviour is ChartTrackBallBehaviorExt trackball)
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{
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// Calculate the distance between the trackball and the touch point
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double distance = Math.Sqrt(Math.Pow(trackball.X - touchPoint.X, 2) + Math.Pow(trackball.Y - touchPoint.Y, 2));
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// Update the nearest trackball if the current one is closer
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if (distance < minDistance)
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{
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minDistance = distance;
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nearestTrackball = trackball;
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}
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}
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}
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return nearestTrackball;
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}
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public void Display(float x, float y)
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{
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X = x; Y = y;
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IsActivated = true;
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var point = new Point(x, y);
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// Set the internal property for the current point
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SetInternalProperty(typeof(ChartTrackBallBehavior), this, point, "CurrentPoint");
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// Trigger the pointer position changed event
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base.OnPointerPositionChanged();
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// Activate the trackball
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InvokeInternalMethod(typeof(ChartTrackBallBehavior), this, "Activate", IsActivated);
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}
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// Sets an internal property of an object using reflection.
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internal static void SetInternalProperty(Type type, object obj, object value, string propertyName)
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{
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var properties = type.GetRuntimeProperties();
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foreach (var item in properties)
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{
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if (item.Name == propertyName)
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{
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item.SetValue(obj, value);
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break;
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}
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}
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}
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// Invokes an internal method of an object using reflection.
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internal static object? InvokeInternalMethod(Type type, object obj, string methodName, params object[] args)
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{
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var method = type.GetTypeInfo().GetDeclaredMethod(methodName);
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return method?.Invoke(obj, args);
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}
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}
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}

‎SfChartMultipleTrackball/SfChartMultipleTrackball/Model/Model.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace SfChartMultipleTrackball
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{
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public class Model
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{
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public string? Day { get; set; }
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public double CPULoad { get; set; }
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}
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}

‎SfChartMultipleTrackball/SfChartMultipleTrackball/SfChartMultipleTrackball.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>WinExe</OutputType>
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<TargetFramework>net8.0-windows</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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<UseWPF>true</UseWPF>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Syncfusion.SfChart.WPF" Version="*" />
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</ItemGroup>
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</Project>

‎SfChartMultipleTrackball/SfChartMultipleTrackball/SfChartMultipleTrackball.csproj.user‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup />
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<ItemGroup>
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<ApplicationDefinition Update="App.xaml">
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<SubType>Designer</SubType>
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</ApplicationDefinition>
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</ItemGroup>
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<ItemGroup>
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<Page Update="MainWindow.xaml">
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<SubType>Designer</SubType>
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</Page>
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</ItemGroup>
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</Project>

‎SfChartMultipleTrackball/SfChartMultipleTrackball/ViewModel/ViewModel.cs‎

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namespace SfChartMultipleTrackball
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{
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public class ViewModel
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{
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public List<Model> Data { get; set; }
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public ViewModel()
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{
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Data = new List<Model>
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{
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new Model { Day = "Monday", CPULoad = 35 },
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new Model { Day = "Tuesday", CPULoad = 42 },
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new Model { Day = "Wednesday", CPULoad = 18 },
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new Model { Day = "Thursday", CPULoad = 30 },
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new Model { Day = "Friday", CPULoad = 64 },
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new Model { Day = "Saturday", CPULoad = 22 },
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new Model { Day = "Sunday", CPULoad = 10 }
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};
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}
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}
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}

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