[ROOT] No X-window

From: Luis Silva (lsilva@mail.desy.de)
Date: Fri Mar 08 2002 - 13:15:36 MET


	Dear roottalk.

	I'm doing a program that use ROOT's ability to generate
postscripts.

	Essentiailly, this program is called by cron in a machine with no
X-window (no grafical interface).

	The postscripts are gererated from histos.


	So i do something like this:

...
   TFile *f;
   TH1F *histo;
   TCanvas *myc=new TCanvas("c","c",0,0,600,400);

...

 f = new TFile("servers_stats.root","RECREATE");
...

   gStyle->SetOptStat(0);

   for (int i=0;i<nlines;i++) {

       Float_t size=0.0;

       TPostScript *ps = new TPostScript(name[i]+".ps",112);
...

       histo=new TH1F(name[i].Data(),"database server
progression",3000,0,3000);
       histo->SetFillColor(4);
       histo->SetMaximum(2100000);
       int count=0;
       while(rs->Next()) {
	   size = rs->GetFloat(1);
	   histo->Fill(count,size);
	   count++;
       }

...

       if (size>500000.0)
	   myc->SetLogy(0);
	   else myc->SetLogy(1);

       f->Write();

         histo->Draw();

       TF1 *max=new TF1("max","2100000",0,3000);
       max->SetLineColor(6);
       max->Draw("same");

       TF1 *dangerous=new TF1("dangerous","1900000",0,3000);
       dangerous->SetLineColor(2);
       dangerous->Draw("same");

       TLegend Legend(0.8, 0.2, 1.0, 0.4);
       Legend.SetHeader(name[i]+"Kb/hour:");
       Legend.AddEntry(histo, "Growth Size", "f");
       Legend.AddEntry(max, "Maximum File size", "f");
       Legend.AddEntry(dangerous, "Dangerous size level", "f");
       Legend.Draw();
       myc->Update();

       ps->Close();
...

	Is there any way to this like "silent"; in a way that not need the
X-window?. There is, probably, a method to do that. I hope.

	Thanks in advance.

	Best Regards.

	Um abraço,
	Luís Silva.

+*************************+***********************************+
|Luís Silva		  |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
|Colaborator at DESY 	  |Adress:FCUL 	      		      |
|in Hamburg Germany	  |Campo Grande, Edifício C8,room 8518|
|Experiment Hera-b        |1749-016 Lisboa-Portugal           |
|e-mail:Luis.Silva@desy.de|Tel.: +351 21 750 00 00 Ext.:28518 |
+=========================+===================================+



This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:45 MET