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Zooming in/out on canvas: how to leave some children unscaled?

Posted By: Posted Date: September 27, 2010 Points: 0 Category :WPF

I'm working with Visual Studio 2008 and I have created a window with a Canvas in a ScrollViewer. On the canvas, I've placed an image and the code I've written places buttons on the canvas at certain locations. So far, so good, but I'm trying to implement a zooming method which scales the canvas and the image, but leaves the buttons intact in terms of size and content -- however, their location should scale together with the image and the canvas.
What I have thusfar is this:

private void zoomIn(Object sender, MouseButtonEventArgs e)
{
  mapCanvas.Width *= ZoomFactor;
  mapCanvas.Height *= ZoomFactor;
  Zoom *= ZoomFactor;
  TransformGroup transform = new TransformGroup();
  transform.Children.Add(new ScaleTransform(Zoom, Zoom));
  transform.Children.Add(new TranslateTransform(0, 0));
  mapCanvas.RenderTransform = transform;
}

This, together with an analogue zoomOut method, works like a charm, but the buttons are scaled as well, obviously because RenderTransform is applied to every child of the canvas as well.

My question is: how can I leave the buttons unscaled?

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