[ROOT]: Gui, TCanvas, and mouse events

From: Mathieu Gisselbrecht (gis_mat@maxlab.lu.se)
Date: Wed Jun 19 2002 - 20:57:24 MEST


Hi,

I'm using ROOT for about 2 years in order to develop multi-coincidence
experiments based on Synhrotron Radiation in molecular physics. A part
of the work is to write a User-Friendly-Interface (which is by essence
almost impossible....). So, I used a lot the GUI demo and the root talk
to get answer to my questions... I really thanks everyone for the
impressive work done !!!

However for about 1 month, I can't find a way to get access to mouse
events in a TCanvas embedded in a TGTransientFrame, the so-called
TRootEmbeddedCanvas. My aim is to give the (x,y) value of the mouse in
an histogram (for instance to know the intensity and the position of a
peak just by moving the mouse). With CINT, it is super easy: 
	just create a TCanvas, and validate in the "Options" menu the "Event
Status"
---------> How can I mange the same thing with an embedded canvas ?

By the way, each time I'm going into more sophisticated concept: 
- default parameters for drawing objects (e.g. histogram, text....)
- events control (keyboard, mouse)
I get stuck in the nowhere land : it looks like there are so many
functions to call, and without a complete set of examples, it's not so
easy... Is the latest User Guide deals with those things ? I only have
the v0.7.2. which is a good start but not enough to understand the
complexity of ROOT.

Thanks in advance,

Best regard,

M. Gisselbrecht



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