I try to describe the scenario that I would like to obtain.
A page contains a map linked to some provider(in example open street map).
Externally exist a "tool box" that contains some tools, in example "circle".
User can drag "circle into the map" so a circle appears, now user can move, resize it.
Various problems appears on drag/resize interaction with base pan events.
And I don't find documentation about how to add a svg layer where I can put shapes.