<Window x:Class="TestClick828374.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel Margin="10">
        <ContentControl Content="{Binding TheImage}"
            MouseDown="ContentControl_MouseDown"
            MouseMove="ContentControl_MouseMove"
            Margin="0 0 0 10"/>

        <StackPanel Orientation="Horizontal">
            <TextBlock Text="mouse-click X = "/>
            <TextBlock Text="{Binding HorizontalClickPoint}"/>
        </StackPanel>
        <StackPanel Orientation="Horizontal" Margin="0 0 0 5">
            <TextBlock Text="mouse-click Y = "/>
            <TextBlock Text="{Binding VerticalClickPoint}"/>
        </StackPanel>

        <StackPanel Orientation="Horizontal">
            <TextBlock Text="mouseover X = "/>
            <TextBlock Text="{Binding HorizontalMouseOverPoint}"/>
        </StackPanel>
        <StackPanel Orientation="Horizontal" Margin="0 0 0 5">
            <TextBlock Text="mouseover Y = "/>
            <TextBlock Text="{Binding VerticalMouseOverPoint}"/>
        </StackPanel>
    </StackPanel>
</Window>

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.ComponentModel;

namespace TestClick828374
{
    public partial class Window1 : Window, INotifyPropertyChanged
    {
        #region ViewModelProperty: TheImage
        private Image _theImage;
        public Image TheImage
        {
            get
            {
                return _theImage;
            }

            set
            {
                _theImage = value;
                OnPropertyChanged("TheImage");
            }
        }
        #endregion test

        #region ViewModelProperty: HorizontalClickPoint
        private double _horizontalClickPoint;
        public double HorizontalClickPoint
        {
            get
            {
                return _horizontalClickPoint;
            }

            set
            {
                _horizontalClickPoint = value;
                OnPropertyChanged("HorizontalClickPoint");
            }
        }
        #endregion test

        #region ViewModelProperty: VerticalClickPoint
        private double _verticalClickPoint;
        public double VerticalClickPoint
        {
            get
            {
                return _verticalClickPoint;
            }

            set
            {
                _verticalClickPoint = value;
                OnPropertyChanged("VerticalClickPoint");
            }
        }
        #endregion test

        #region ViewModelProperty: HorizontalMouseOverPoint
        private double _horizontalMouseOverPoint;
        public double HorizontalMouseOverPoint
        {
            get
            {
                return _horizontalMouseOverPoint;
            }

            set
            {
                _horizontalMouseOverPoint = value;
                OnPropertyChanged("HorizontalMouseOverPoint");
            }
        }
        #endregion test

        #region ViewModelProperty: VerticalMouseOverPoint
        private double _verticalMouseOverPoint;
        public double VerticalMouseOverPoint
        {
            get
            {
                return _verticalMouseOverPoint;
            }

            set
            {
                _verticalMouseOverPoint = value;
                OnPropertyChanged("VerticalMouseOverPoint");
            }
        }
        #endregion test

        public Window1()
        {
            InitializeComponent();
            DataContext = this;

            TheImage = new Image();
            TheImage.Source = new BitmapImage(new Uri(@"c:testrectangle.png"));
            TheImage.Stretch = Stretch.None;
            TheImage.HorizontalAlignment = HorizontalAlignment.Left;

        }

        #region INotifiedProperty Block
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion test

        private void ContentControl_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            Point clickPoint = e.GetPosition(TheImage);
            HorizontalClickPoint = clickPoint.X;
            VerticalClickPoint = clickPoint.Y;
        }

        private void ContentControl_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
        {
            Point clickPoint = e.GetPosition(TheImage);
            HorizontalMouseOverPoint = clickPoint.X;
            VerticalMouseOverPoint = clickPoint.Y;
        }
    }
}