aistudio-wpf-diagram/Live-Charts-master/Examples/Wpf/CartesianChart/SectionsMouseMove/SectionMouseMoveSample.xaml.cs

using System.Windows.Controls;
using System.Windows.Input;
using LiveCharts;
using LiveCharts.Helpers;
using LiveCharts.Wpf;

namespace Wpf.CartesianChart.SectionsMouseMove
{
	/// <summary>
	/// Interaction logic for SectionMouseMoveSample.xaml
	/// </summary>
	public partial class SectionMouseMoveSample : UserControl
	{
		public SectionMouseMoveSample()
		{
			InitializeComponent();
		}

	    private void UIElement_OnMouseMove(object sender, MouseEventArgs e)
	    {
	        var vm = (ViewModel) DataContext;
	        var chart = (LiveCharts.Wpf.CartesianChart) sender;

            //lets get where the mouse is at our chart
	        var mouseCoordinate = e.GetPosition(chart);

            //now that we know where the mouse is, lets use
            //ConverToChartValues extension
            //it takes a point in pixes and scales it to our chart current scale/values
            var p = chart.ConvertToChartValues(mouseCoordinate);
            
            //in the Y section, lets use the raw value
	        vm.YPointer = p.Y;

            //for X in this case we will only highlight the closest point.
            //lets use the already defined ClosestPointTo extension
            //it will return the closest ChartPoint to a value according to an axis.
            //here we get the closest point to p.X according to the X axis
	        var series = chart.Series[0];
            var closetsPoint = series.ClosestPointTo(p.X, AxisOrientation.X);

            vm.XPointer = closetsPoint.X;
	    }
	}
}