Rotate label of a TH1D

ROOT
1

ROOT Version: 6.08.06-c8fb4
Platform: lxplus machines
Compiler: x86_64-slc6-gcc62-opt

Dear ROOT experts,
I am drawing a TH1D and I have defined x-labels with :

hist.GetXaxis().SetBinLabel(i_bin,my_string)

Then when I look at the plot, I see several labels overlapping and I would like to play with the angle of the label to avoid such overlaps.
After several tests of things found in the TAxis class or google, I am not able to modify the angle with

hist.GetXaxis().ChangeLabel(i_bin, -60., -1., -1, -1, -1, my_string)

(I see no changes in the display)
and I am not happy with the display I get from

h.LabelsOption(“v”)

What is the solution to my problem ?
Cheers, David.

2 

root [0] auto h = new TH1D("h","h",10,0.,1.)
(TH1D *) @0x7ffeef30a798
root [1] h->Draw()
Info in <TCanvas::MakeDefCanvas>:  created default TCanvas with name c1
root [2] h->GetXaxis()->ChangeLabel(2,30,-1,-1,-1,-1,"Label with angle")
root [3] gPad->Update(); gPad->Modified();

45
Screenshot 2019-01-17 at 13.07.45.jpg1396×964 71.3 KB

3

It seems that I have a conflict when using

hist.GetXaxis().SetBinLabel(i_bin,my_str)
hist.GetXaxis().ChangeLabel(i_bin, -60., -1., -1, -1, -1, my_string)

if I use the ChangeLabel() alone I can rotate. But when both SetBinLabel() and ChangeLabel() are used, the ChangeLabel() is not applied.
I can close this ticket.
Thanks for your help.

4

Ah yes that could be. Change labels apply on numerical axis only.

5

I understand. Good to know. Thanks again.

6

It is simply not implemented. It could be if there is some real need.