Re: Bug in DrawPanel

Rene Brun (Rene.Brun@cern.ch)
Mon, 02 Jun 1997 16:28:24 +0200

Rudi Lutter wrote:
>
> Dear roots,
>
> I think there is bug in "DrawPanel":
> Try the following:
> (1) run "hsimple" to produce a histogram
> (2) click on the curve to get the DrawPanel for "hpx"
> (3) use the slider to select a region
> (4) click on the curve once more to get "FitPanel"
> (5) do a gaussian fit for example
> (6) click on the fitted curve to get a DrawPanel again
> (7) the above DrawPanel (2) will then be reassigned to "gauss"
> (8) trying to use the slider causes "segment violation"
> (9) the original histogram "hpx" vanishes
>
> It seems that some "hpx" defs are left in the DrawPanel when it is reused
> for the "gauss" curve.
>

Thanks for reporting this problem.
I have protected the class TDrawPanelHist to prevent zooming
when the DrawPanel is invoked from a function fitted on top
of an histogram. To zoom, select the histogram, not the fitted
function.

Rene Brun