[ROOT] Number of SubPads in a Pad ?

From: Frederic Sarazin (sarazin@triumf.ca)
Date: Fri Feb 15 2002 - 00:09:42 MET 

Hello,

I'm looking for the method which would give me the number of
subpads which are attached to a given pad...

I tried:

TCanvas* Current = gPad->GetCanvas(); (From this I get a pointer to the
Canvas in which my gPad is)

then:

int_t Total_Number_of_Pads = ((TList*)
Current->GetListOfPrimitives())->GetSize();

This happen to give me a number which is actually the number of pads
attached to the canvas... however, when
I take a random Pad in this canvas and divide it into subpads (lets say
4 = (2,2)) and with the following
recursive program I try to put all of the 1D spectra in a LinY scale:

Linyall()
{

  // Auto Lin in Y direction for all Pads belonging
  // to the canvas in which gPad is active

  Int_t Current_Pad = 0, Pads = 0;
  TCanvas* Current = gPad->GetCanvas();
  Int_t Pad_Number = gPad->GetNumber();

  Pads = ((TList*) Current->GetListOfPrimitives())->GetSize();
  Current->cd(Current_Pad);

  if (Pads==0)
    {
      gPad->SetLogy(0);
      gPad->Modified();
    }
  else gPad->cd(Current_Pad++);

  while (Pads>0)
    {
      Pads = 0 ;
      Pads = ((TList*) gPad->GetListOfPrimitives())->GetSize();
      if (Pads==0)
 {
   gPad->SetLogy(0);
   gPad->Modified();
 }

      else
 {
   Current_Pad=0;
   gPad->cd(Current_Pad++);
 }
    }

  Current->cd(Pad_Number);
  gPad->Modified();
}

The program seems to loop endlessly, the reason is in fact that the
command:

 Pads = ((TList*) gPad->GetListOfPrimitives())->GetSize();

  doesn't give the number of Subpads in the Pads anymore... So, I
suspect there is
a method that I missed which return the number of SubPads into a given
Pad.

Thanks for any help !

Fred (TRIUMF - Canada)

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