[ROOT] 1D histogram/stack coordinates

From: Edward Chen (edward@SLAC.stanford.edu)
Date: Fri Sep 06 2002 - 08:55:44 MEST


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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