ChangeLabel-JSROOT

[nmmalikroot]

Dear expert,
I am trying to change the label of axis, here i pasted demo script

void can()
{
    THttpServer* serv = new THttpServer("http:8080");
	  TCanvas *c2 = new TCanvas("c2","param");
	  c2->cd();
	  	serv->Register("/", c2);
   TH1F *h;
   h = new TH1F("histo","",100,-5.0,5.0);
   h->FillRandom("gaus",10000);
   h->GetXaxis()->SetTitle("x axis");
   h->GetYaxis()->SetTitle("y axis");
    auto xax = h->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));}
   h->Draw();
     //http://localhost:8080/
  } 
 

It works fine in local-root-browser ,it show all the 5 label

but in web-root browsershow 2 label only i.e 0 and 1

any suggestion?

lease read tips for efficient and successful posting and posting code_

_ROOT Version:ROOT@v6-26-04
Platform: Not Provided
Compiler: Not Provided

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[linev]

Hi,

I will check problem once I am back from vacations end of August.

Regards,
Sergey

[linev]

Hi,

I can reproduce the problem.

It is due to the fact that ROOT and JSROOT uses different algorithms to produce TAxis ticks.

In your particular case these are [-5, -3, -1, 1, 3] and [-5, 0].

TAxis::ChangeLabel changes not the specific label but just label for the tick by its number.
Therefore you see “0” and “1” in case of JSROOT.

The only solution for you - always use JSROOT. Then see which ticks created there and try to change labels for them. Be aware, that after zooming labels will be screwed up anyway.

By the way, you can try to run root --web to use JSROOT for TCanvas.
In that case you do not need to start THttpServer by yourself.

Regards,
Sergey