Re: ZOOM by mouse

Rene Brun (Rene.Brun@cern.ch)
Tue, 22 Jun 1999 15:54:12 +0000

Hi Hongquan,
If you want to see in the same canvas both the zoomed and unzoomed
histogram h,
proceed as follow:
- h.Draw(); // draw histogram in the canvas
- create a new pad in this canvas (editor or command)
- cd to this new pad. (click with middle mouse button in the new pad)
- h.DrawCopy(); // draw a copy of h in the new pad

Now, you can zoom independently the histogram in both pads.

Rene Brun

Hongquan Niu wrote:
>
> Hi,
>
> I know we can use mouse to zoom in the existing histogram
> and create a maybe smaller pad or something else with zoomed in
> histogram. So both histgrams appear on the canvas. I tried
> but never success. Can anyone tell me how to do that?
>
> Thanks,
> Hongquan
>
> On Tue, 22 Jun 1999, Rene Brun wrote:
>
> > Hi Valeri,
> > You are probably clicking on the wrong place.
> > You must see the "hand cursor" if you really point to an axis.
> > You can also try clicking with the right mouse button to check that
> > the pop-up menu refers to a TAxis object.
> >
> > Rene Brun
> >
> > Tioukov Valeri wrote:
> > >
> > > Hi rooters,
> > >
> > > I tried to zoom the histogram by mouse as was anounceed in
> > >
> > > http://root.cern.ch/cgi-bin/print_hit_bold.pl/root/roottalk/roottalk98/2349.html
> > > "Note that in the version 2.20, I have added an automatic zoom
> > > facility. You can click with the left button on the position
> > > where you want to start zooming and release the button where
> > > you want to end zooming."
> > >
> > > by Rene, but without success: left mouse button has no actions in case of
> > > 2-d histogram and has "move histogram" action in 1-d case.
> > >
> > > What is wrong?
> > >
> > > I use root 2.22/04 on RH6.0
> > >
> > > Regards
> > > Valeri
> >