TPad seg fault

From: OKUMURA, Akira <oxon_at_astro.isas.jaxa.jp>
Date: Thu, 2 Sep 2010 15:00:04 -0700

Hello ROOTers,

The following code cause a seg fault because TPad instances seem to be deleted after the 1st loop of j is ended. Would you tell me what the problem is in the code? Using 5.27 and trunk on OS X 10.6 and SL5.

#include "TCanvas.h"
#include "TPad.h"
#include <iostream>

static const Int_t kSegmentN = 3;
static const Int_t kSampleN = 16;

void tmp()
{
  TCanvas* can = new TCanvas("can", "can", 1200, 800);   can->Divide(4, 4, 1e-10, 1e-10);

  TPad* pad_sigma[kSampleN];
  TPad* pad_res[kSampleN];

  for(Int_t i = 0; i < kSampleN; i++){
    pad_sigma[i] = new TPad(Form("pad_sigma%02d", i), Form("pad_sigma%02d", i), 0, 0, 1, 1);     pad_res[i] = new TPad(Form("pad_res%02d", i), Form("pad_res%02d", i), 0, 0, 1, 1);

    can->cd(i + 1);
    gPad->SetBottomMargin(0.5);
    pad_sigma[i]->SetMargin(0.1, 0.1, 0.3, 0.5);     pad_sigma[i]->SetFillStyle(0);

    can->cd(i + 1);
    pad_res[i]->SetMargin(0.1, 0.1, 0.1, 0.7);     pad_res[i]->SetFillStyle(0);
  } // i

  for(Int_t i = 0; i < kSegmentN; i++){
    for(Int_t j = 0; j < kSampleN; j++){

      can->cd(j + 1);
      gPad->DrawFrame(0, 0, 1, i + 1);

      pad_sigma[j]->Draw();
      pad_sigma[j]->cd();
      gPad->DrawFrame(0, 0, 1, i + 1);
      
      pad_res[j]->Draw();
      pad_res[j]->cd();
      gPad->DrawFrame(0, 0, 1, i + 1);

    } // j
    // can->Update();
  } // i
}

Regards,

--
OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
Institute of Space and Astronautical Science (ISAS/JAXA)
Now at KIPAC/SLAC/Stanford
Varian Physics #306
382 Via Pueblo Mall, MC 406 Stanford, CA94305
TEL 650-736-0971/FAX 650-724-5065
Skype : okumura.akira

Received on Fri Sep 03 2010 - 00:00:22 CEST