Hi,

The BringIntoView line inside the if (node != null) block never runs because node is null. Even if it did, BringIntoView will have effect only if the node is outside the visible area, so it does not make any sense to call it for the clicked node.

Stoyan

Actually if you call BringIntoView(item, true), the item will be centered even if it's currently visible. If you need to center on a point without having an item there, try this:

private void diagram_Clicked(object sender, DiagramEventArgs e)
{
	var visibleSize = new Rect(0, 0, scrollViewer.ActualWidth, scrollViewer.ActualHeight);
	visibleSize = diagram.ClientToDoc(visibleSize);
	var centeredRect = new Rect(
		e.MousePosition.X - visibleSize.Width / 2,
		e.MousePosition.Y - visibleSize.Height / 2,
		e.MousePosition.X + visibleSize.Width / 2,
		e.MousePosition.Y + visibleSize.Height / 2);
	(diagram.DocumentPlane as FrameworkElement).BringIntoView(centeredRect);
} 

In both cases centering won't work if the ScrollViewer's range does not allow it - e.g. if the point is near the diagram boundaries or the ScrollViewer can't scroll because it already shows the full diagram after zooming out.

I hope that helps,
Stoyan