ChangeLabel in jsroot

O² O2 Analysis
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1

Dear expert, I am trying to change the label of a 2d histo’s using

auto xax = mLayers[iLayer]->GetXaxis();
    xax->SetNdivisions(-5);
        xax->CenterLabels();
     xax->SetTickLength(0);
     for(Int_t i =0; i<5;i++)  xax->ChangeLabel(i+1,-1,-1,-1,-1,-1,Form("%i",i));
    
    auto yax = mLayers[iLayer]->GetYaxis();
    yax->SetNdivisions(-18);
    yax->CenterLabels();
    for (int iSec = 0; iSec < 18; ++iSec)  yax->ChangeLabel(iSec+1,-1,-1,-1,-1,-1,Form("%i",iSec));

plot in local root file is good .
Canvas_1
as I expected.
but in qcg its wired, have a look

canvas
canvas573×504 47.5 KB

https://qcg-test.cern.ch/?page=objectView&objectName=qc/TRD/MO/TrackletsTask/TrackletsPerLayer/layer0look at the label it able to draw label for three-tick only.

Any suggestion?

2

Hi @namalik ,

Thank you for the question!

The generated plot by QCG is the one intented by the task generating the ROOT Object. If you take a closer look at the object stored in CCDB: http://ccdb-test.cern.ch:8080/latest/qc/TRD/MO/TrackletsTask/TrackletsPerLayer/layer0 , you will see that there are 2 parameters stored in the database: drawOptions - COLZ and displayHints - logz

These parameters are generated through QC tasks (more info: QualityControl/Advanced.md at master · AliceO2Group/QualityControl · GitHub )
QCG takes those parameters and applies them before plotting the ROOT object.

If you would like to ignore these parameters, you will need to:

  1. Create a layout
  2. Add the object to your layout
  3. Edit layout and select object and select option Ignore defaults
  4. Save the layout

I created an example layout with comparisons for you: https://qcg-test.cern.ch/?page=layoutShow&layoutId=62ffa5d432332505759f139e

Please let me know if you have further questions!

Have a nice weekend,
George

3

@graduta
I think you miss-understood my question . I am talking about label of x-axis and y-axis, as you see in above figures , first figure was drawn in local-root browser the label is good as according to defined in above script, but the second figure , that is from qcg-testweb browser, the label in both x-axis and y-axis not draw all label .