[ROOT] Saving a canvas

From: Rajat Bhatnagar (rajb@SLAC.stanford.edu)
Date: Tue Jul 30 2002 - 21:47:06 MEST 

Hi,

I've been writing a macro that saves the canvas pointed to by gPad and all
objects on it.  I've run into two problems.

1. When histogram color is changed through hist->SetLineColor(kRed) this
change isn't saved when you do hist->Write();  Are there any ways to get
around this?

2. The draw options for histograms (like col or lego) as well as the
canvas options (like logy) are not saved either when you use Write().  How
would one extract and save this information?

I'm running v.3.02/07 on red hat 6.2.  The code I've been using is pasted
below:

Thanks,
Rajat Bhatnagar

#include <iostream.h>
#include "TH1.h"
#include "TPaveLabel.h"
#include "TCanvas.h"
#include "TFile.h"
#include "TKey.h"
#include "TROOT.h"
#include "TStyle.h"

void SaveCanvas(TFile* f)
{
  TList* t0 = gPad->GetListOfPrimitives();
  TObject* obj;

  if (!f->IsWritable())
    cout << "Error: file not writeable.\n";

  if (t0) {
    TListIter next(t0);
    while ((obj=next())) {
      cout << "Saving: " << obj->GetName() << endl;
      obj->Write();
    }
  }
}


void ReadCanvas(TFile* f)
{
  TList* t0 = f->GetListOfKeys();
  TObject *key, *obj;
  int firsttime = 1;

  if (t0) {
    TListIter next(t0);
    while ((key=next())) {
      obj = ((TKey*) key)->ReadObj();
      cout << "Reading: " << obj->GetName() << endl;
      if (obj->InheritsFrom("TH1") && firsttime) {
	obj->Draw();
	firsttime = 0;
      }
      else if  (obj->InheritsFrom("TH1"))
	obj->Draw("same");
      else
	obj->Draw();
    }
  }

}

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