Re: [ROOT] 1D histogram/stack coordinates

From: Rene Brun (Rene.Brun@cern.ch)
Date: Fri Sep 06 2002 - 09:13:17 MEST


Hi Ed,

do:
  new TLine(xcut,gPad->GetUymin(),xcut,gPad->GetUymax());

Rene Brun

On Thu, 5 Sep 2002, Edward Chen wrote:

> Hi - yet another question:
> 
> I'm trying to draw TLines on top of either TH1F's or THStack's.  The lines
> are vertical lines which indicate the position of a cut, for example.  I'd
> like the line to extend from the low horizontal edge of the histo box to
> the upper horizontal edge of the histo box.
> 
> The lower edge will always have a Y coordinate of 0, so that's no problem.
> 
> But I can't seem to figure out a way to get automatically the Y coordinate
> of the upper edge.  For example using THStack::getMaximum seems to return
> the maximum, but not the coordinate of the upper horizontal edge.  Using
> TH1F::getMaximum or TH1F::getMaximumStored also doesn't give satisfactory
> results either.
> 
> Thanks in advance,
> 
> -Ed
> 



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