Приближение к курсору мышки при масштабирование canvas

private ScaleTransform st = new ScaleTransform();
public MainWindow()
{
InitializeComponent();
cnv.LayoutTransform = st;
}
private void canvas1_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
coordinate_X = (e.GetPosition(cnv).X );
 
if (e.Delta > 0)
{
st.ScaleX *= 1.1;
}
if (e.Delta < 0)
{
st.ScaleX /= 1.1;
 
}
 
st.ScaleY = st.ScaleX;
 
}

public ScaleTransform strf = new ScaleTransform();
 
public MainWindow()
        {
            InitializeComponent();
            myPicture.LayoutTransform = strf;
         }
 
private void canvas1_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
     Point Point = e.GetPosition(myPicture);
                        position = myPicture.Margin;
                        if (e.Delta > 0) { strf.ScaleX *= 1.1; position.Left -= Point.X * 0.1 * strf.ScaleX;  position.Top -= Point.Y * 0.1 * strf.ScaleY; }
                        if (e.Delta < 0) { strf.ScaleX /= 1.1;  position.Left += Point.X * 0.1 * strf.ScaleX; position.Top += Point.Y * 0.1 * strf.ScaleY;  }
                        myPicture.Margin = position;
                        strf.ScaleY = strf.ScaleX;
}