private void Image_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
TranslateTransform tt;
ImageView.CaptureMouse();
if (!(ImageView.RenderTransform is TransformGroup))
{
var st = new ScaleTransform();
tt = new TranslateTransform();
var group = new TransformGroup();
group.Children.Add(st);
group.Children.Add(tt);
ImageView.RenderTransform = group;
}
tt = (TranslateTransform)((TransformGroup)ImageView.RenderTransform).Children.First(tr =>
tr is TranslateTransform);
_start = e.GetPosition(ImageDock);
_origin = new Point(tt.X, tt.Y);
}