[ROOT] Secondary axis labels

From: Guillaume Blanc (gblanc@hep.saclay.cea.fr)
Date: Fri Oct 04 2002 - 18:22:06 MEST


Hello,

When I plot a secondary X axis on a histogram, using a TF1 formula to get
the ticks positions; it's works quite well, but for the labels, which are
not in front of the major ticks, but between, with a lot of training
decimals.

Here is the piece of code I use:

  // X axis is linear from 0 to 11.
  c1->Update();
  TF1 *magax = new TF1("magax","0.62*x",0,gPad->GetUxmax()*0.62);
  TGaxis *axe = new TGaxis(gPad->GetUxmin(), gPad->GetUymax(),
                           gPad->GetUxmax(),
                           gPad->GetUymax(), "magax" ,510,"-");
  axe->Draw();

The result of this is ticks well positionned, but labels are:

0 - 1.1367 - 2.2733 - 3.41 - 4.5467 - 5.6833 - 6.82

The last number, 6.82 correponds to gPad->GetUxmax()*0.62.

Instead of what I would espect: 0 - 1 - 2 - 3 - 4 - 5 - 6

Is there a way to ask to TGaxis to put labels on major ticks and not
between them ?

Thanks for your help.

              Guillaume Blanc



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