[ROOT] How do I suppress the canvas ?

From: Harufumi Tsuchiya (harufumi@icrr.u-tokyo.ac.jp)
Date: Fri Feb 01 2002 - 06:47:17 MET 

Hi ROOTers,

I would like to create many postscript files without
showing canvas on display.
What method or option shuld I use to do this ?

Now, I did following precedure in my program.
In this case, postscript files were created. But, 
canvas also appeared on display.

I use ROOT v 3.02/07 on IRIX65 with g++ 2.95.2.

Thank you for your help.


TCanvas *c1;
Int_t nDiv  = 996;
Int_t istep = 12;
Int_t pad_num = 0;
Int_t sch, ech;

for ( Int_t i = 0; i < nDiv; i = i + istep) {
    sch = i; ech = i + istep;
    pad_num = 0;
    c1 = new TCanvas("c1", "", 100, 100, 600, 800);
    c1->Divide(3, 4);
    for ( Int_t j = sch; j  < ech; j++ ) {
      c1->cd(pad_num+1);
      h1[j]->SetXTitle("number of particles");
      h1[j]->SetLineColor(2);
      h1[j]->Draw("");
      gPad->Modified();
      gPad->Update();
      pad_num++;
    }
    c1->Update();
    sprintf(psfile, "ps/ch%d-ch%d_NumOfParDist.ps",  sch, ech);
    c1->Print(psfile);
    cout << " Create ps file : " << psfile << endl;
    c1->Clear();
}

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