Hi,

After changing ZoomFactor, call diagram.BringIntoView(node, true) to set the scroll position in such a way that the node is at the center of the currently visible area. This also depends on the scroll range of the ScrollViewer that contains the diagram, and the node might not appear exactly at the center if it's near the diagram border.

You can't set the zoom center, but you could call ZoomToRect to zoom and center the view on the specified rectangle. That will let you zoom towards some point by creating a rectangle with that point at the center. Zooming in can be done by setting the rectangle size to be smaller than the currently visible area, and zooming out - by setting a larger size.

For another ways to zoom at a specified point, use the Search link at the top of the forum page and search for 'MouseWheel'.

I hope that helps,
Stoyan