How to get Zoom value in scroll viewer in C# wpf Kinect SDK 2.0?

This has nothing to do with Kinect SDK, this is more of a ScrollViewer zooming issue. There is no k:KinectRegion.ZoomFactor because zooming doesn't change the actual size of the image, it only performs some layout transformations, therefore you can get the zooming factor from LayoutTransform property of your Image.

Something like the following code should get the zooming factor:

UserControl.Code:

    public NavigationImage()    {        InitializeComponent();        DataContext = this;        _zoom = 1.0;    }    double _zoom;    public string ZoomPercentage    {        get        {            return _zoom * 100 + "%";        }    }    private void scrollViewer_MouseWheel(object sender, MouseWheelEventArgs e)    {        if (e.Delta > 0)        {            _zoom += 0.1;        }        else        {            _zoom -= 0.1;        }        ScaleTransform scale = new ScaleTransform(_zoom, _zoom);        navigationImage.LayoutTransform = scale;        OnPropertyChanged("ZoomPercentage");        e.Handled = true;    }

UserControl.Xaml:

<UserControl x:Class="ImageNav.NavigationImage"  ...    >    <Grid Grid.RowSpan="2">        <ScrollViewer Name="scrollViewer" Grid.Row="0" PreviewMouseWheel="scrollViewer_MouseWheel"        ....                      HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"                      k:KinectRegion.IsHorizontalRailEnabled="true" k:KinectRegion.IsVerticalRailEnabled="true"                      k:KinectRegion.ZoomMode="Enabled"                      >            <Image Name="navigationImage" RenderTransformOrigin="0.5, 0.5"/>        </ScrollViewer>        <TextBox x:Name="ZoomTextBox" Grid.Row="1" Text="{Binding ZoomPercentage, Mode=OneWay}" .... />    </Grid></UserControl>