Re: Zooming problem with TGraph

In attachement, see a new version of your script that will work correctly with unzooming. It uses a function DrawFrame that is a copy of the updated function TPad::DrawFrame now in CVS.

Rene Brun

On Sat, 29
Apr 2006, Marco Calviani wrote:

> Hi Rene,
> thanks for your reply.
>
> 2006/4/29, Rene Brun <Rene.Brun_at_cern.ch>:
>> The zoom precision corresponds to the number of bins along x or y.
>> In case of log scales and a big range (in your case 1e-2 to 1e6)
>> the current algorithm may fail if the number of bins is too small.
>> I habve modified your program to be able to zoom more deeply in
>> your graph. see below.
>>
>
> i've done how you told me but i'm encountering two problems:
> 1) When i zoom on the Y axis, the minimum does not longer stay
> blocked, but unfortunately when i try to unzoom the following error
> appears:
>
> Error in <THistPainter::PaintInit>: log scale is requested but maximum
> is less or equal 0 (0.000000)
>
> 2) Along the X axis the correct zooming process is allowed only if the
> lower limit is set to 5-6. If lower than this the minimum is always
> 10e-2.
>
> Regards,
> MC
>