Plotting the intersection of two data sets as a scatter series.

MainWindow.cs

using Infragistics.Controls.Charts;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication4
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private TestData _testDataA;
        private TestData _testDataB;

        public MainWindow()
        {
            InitializeComponent();
            SetupTestData();

            var intersect = _testDataA.Intersect(_testDataB).ToList();
            var onlyA = _testDataA.Except(intersect).ToList();
            var onlyB = _testDataB.Except(intersect).ToList();

            var xAxis = new NumericXAxis();
            var yAxis = new NumericYAxis();
            var scatter1 = new ScatterSeries()
            {
                Name = "onlyA",
                Title = "Only A",
                ItemsSource = onlyA,
                XMemberPath = "XValue",
                YMemberPath = "YValue",
                XAxis = xAxis,
                YAxis = yAxis
            };
            var scatter2 = new ScatterSeries()
            {
                Name = "onlyB",
                Title = "Only B",
                ItemsSource = onlyB,
                XMemberPath = "XValue",
                YMemberPath = "YValue",
                XAxis = xAxis,
                YAxis = yAxis
            };
            var scatter3 = new ScatterSeries()
            {
                Name = "intersect",
                Title = "A Intersect B",
                ItemsSource = intersect,
                XMemberPath = "XValue",
                YMemberPath = "YValue",
                XAxis = xAxis,
                YAxis = yAxis
            };

            theChart.Axes.Add(xAxis);
            theChart.Axes.Add(yAxis);
            theChart.Series.Add(scatter1);
            theChart.Series.Add(scatter2);
            theChart.Series.Add(scatter3);
            theChart.HorizontalZoomable = true;
            theChart.VerticalZoomable = true;
        }

        private void SetupTestData()
        {
            var testDataA = new TestData();
            var testDataB = new TestData();
            var testDataIntersection = new TestData();

            testDataA.AddRange(testDataIntersection);
            testDataB.AddRange(testDataIntersection);
            _testDataA = testDataA;
            _testDataB = testDataB;
        }
    }

    public class TestDataItem
    {
        public string Label { get; set; }
        public double XValue { get; set; }
        public double YValue { get; set; }

        public override int GetHashCode()
        {
            var ret = Label != null ? Label.GetHashCode() : 0;
            ret = ret + 17 * XValue.GetHashCode();
            ret = ret + 17 * YValue.GetHashCode();
            return ret;
        }

        public override bool Equals(object obj)
        {
            if (obj == null && !(obj is TestDataItem))
            {
                return base.Equals(obj);
            }

            var other = (TestDataItem)obj;
            return other.Label == Label &&
                other.XValue == XValue &&
                other.YValue == YValue;
        }
    }

    public class TestData
        : List<TestDataItem>
    {
        private static Random _rand = new Random();
        public TestData()
        {
            for (var i =0; i < 50; i++)
            {
                Add(new TestDataItem()
                {
                    Label = i.ToString(),
                    XValue = _rand.NextDouble() * 100.0,
                    YValue = _rand.NextDouble() * 100.0
                });
            }
        }
    }
}