In the current Root, zooming in a pad is an operation to be
implemented by the application. I should clearly document somewhere
how to implement this function in some examples.
I will probably add (if I can really find a quiet moment) this
function in TPad itself.
Zoom is connected with picking. Some rough indications about picking
are given at http://HowtoPick.html.
In brief, you must implement a class with member functions
DistancetoPrimitive and ExecuteEvent. You must draw an object
of this class in the pad (by Draw, I mean add this object to the pad,
that is what TObject::Draw is doing by default for you).
I know that Pasha has already a very nice example of an event display
with a nice zoom facility included. Pasha, would you be willing
to publish your class?
Rene Brun