Dear Enterria David
On 22 Jul 98 at 1:47, you wrote:
> I am interested in storing into a vector the (x,y) values of a
> histogram point by clicking on it with the mouse. i.e. I want to
> know if there exists something in ROOT equivalent to the PAW
> instructions:
>
> vloca x y *
> aa=x(1)
> bb=y(1)
> ...
>
The "equivalent" of that PAW command us a method
http://root.cern.ch/root/html/TGXW.html#TGXW:RequestLocator
But I would not recommend this approach to do what you want.
The recommended way is expressed on
http://root.cern.ch/root/HowtoPick.html
Please read this page.
To implement your own histogram picking you may regard writing
your own derived class with only method ExecuteEvent overloaded as
follows:
MyPickedHistogram.h:
class MyPickedHistogram : public TH1 {
public:
void ExecuteEvent(Int_t event, Int_t px, Int_t py):
}
Very likely you will want to use TH1F (or some other particular "histogram" class)
instead of the base TH1.
MyPickedHistogram.cxx:
void MyPickedHistogram:: ExecuteEvent(Int_t event, Int_t px, Int_t py)
{
// Don't forget to call the "native" ExecuteEvent" to preserv the "native" functionality
TH1::ExecuteEvent(event,px,py);
// Put your own actions below
// < your own action> (see TButton.h for the event values)
}
Look "http://root.cern.ch/root/html/src/TH1.cxx.html#TH1:ExecuteEvent" up
and use it as example.
=================================================================
Dr. Valeri Faine (Fine)
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