get element translation / previous location with iupdater

[patricklee9FSMF]

Hi all, I'm trying to create a iupdater to move element A if element B is moved by a certain translation manually. However I'm wondering how can I get that translation vector after a move command? 

My approach is to create a parameter to store its latest location by another iupdater, then I can do calculations with the previous and latest location point. But are there any simpler ways to do this?

[jeremy_tammik]

Very good question. No good answer, unfortunately. The updater will only provide the new, updated element data. If the original, old data is important for you, you will have to store it somewhere yourself. For instance, you could store the element location in extensible storage data on the element itself. Then the difference between your stored data and the current would give you what you need. There is a wish list item for this in the Revit Idea Station. You should vote for it.