Black rectangle over histograms

ROOT
1

I trying to plot 8 histograms on one canvas, but I am getting black rectangles over almost whole histograms (I put example image into attachement). I have cut out part of the code to reproduce the problem on smaller macro:

[code]#include “TROOT.h”
#include “TStyle.h”
#include “TCanvas.h”
#include “TFile.h”
#include “TString.h”
#include “TH1.h”
#include

void reco_compare_problem_mincode()
{
TObjArray Hlist(0);
TString histname, histitle;
std::ostringstream ss;

// create histograms
TH1F* x_pot_h[8];
for (Int_t i=0; i<8; i++){
	
	ss.str("");
	ss << i;
	
	histname = "pot " + ss.str() + ", \\Delta x[mm] ";
	histitle = "pot " + ss.str() + "; \\Delta x[mm]; dN/dx";
	
	x_pot_h[i] = new TH1F(histname, histitle, 100, -0.2, 0.2);
	Hlist.Add(x_pot_h[i]);
}

// fill histograms
for (Int_t i=0; i<3; i++)
{
	  for (int iPot=0; iPot<8; iPot++){
			x_pot_h[iPot]->Fill(0.0);
		}
}

TFile f("ALFA_control_plots_test.root","recreate");
Hlist.Write();

// draw histograms
TCanvas *c4 = new TCanvas("c4","Root Canvas",1200,760);
c4->Divide(4,2);
gStyle->SetOptStat(1111110);

c4->cd(1);
x_pot_h[0]->Draw();
c4->cd(2);
x_pot_h[2]->Draw();
c4->cd(3);
x_pot_h[4]->Draw();
c4->cd(4);
x_pot_h[6]->Draw();
c4->cd(5);
x_pot_h[1]->Draw();
c4->cd(6);
x_pot_h[3]->Draw();
c4->cd(7);
x_pot_h[5]->Draw();
c4->cd(8);
x_pot_h[7]->Draw();

f.Close();

}[/code]

The rectangles are present in both canvas and histograms stored in the file.
I am running under Atlas Offline (Athena) 19.0.2 on lxplus, I have tried other versions, without change. The problem seems to be related/caused by my style settings in rootlogon.c:

{// Add my own options here: TStyle* mcStyle = new TStyle("mcStyle","Custom style"); mcStyle->SetPalette(1,0); // avoid horrible default color scheme mcStyle->SetOptDate(0); mcStyle->SetLabelSize(15,"xyz"); // size of axis value font mcStyle->SetTitleSize(16,"xyz"); // size of axis title font mcStyle->SetTitleFont(43,"xyz"); // font option mcStyle->SetLabelFont(43,"xyz"); mcStyle->SetTitleOffset(2,"xy"); // default canvas options mcStyle->SetCanvasDefW(500); mcStyle->SetCanvasDefH(500); mcStyle->SetCanvasColor(0); // canvas... mcStyle->SetCanvasBorderMode(0); mcStyle->SetCanvasBorderSize(0); mcStyle->SetPadGridX(0); // grids, tickmarks mcStyle->SetPadGridY(0); mcStyle->SetPadTickX(1); mcStyle->SetPadTickY(1); mcStyle->SetPadBorderMode(0); mcStyle->SetPadColor(0); mcStyle->SetFrameBorderMode(0); gROOT->SetStyle("mcStyle"); cout << "Styles are Set!" << endl; return; }
However, I do not see the problem.
Strange is, this happens only to some sets of histograms (the first few being drawn).

2

The macro you sent me produces the attached plot with both ROOT 5.34 and ROOT 6.
It looks fine… no black rectangles

c4.png1179×586 20 KB

3

Try to run your macro with the line “f.Close();” commented out (i.e. “removed”).

4

@Wile: I ran the macro with the line f.Close() and I do not see the black rectangles.

5

Thank you for trying. Did you try it with rootlogon.c, I posted? Because it seems to be causing the black rectangle. I have been using the style setting for quite some time, however and it was ok until I used the macro in the post.

6

@Wile: I tried to comment out the f.Close() and nothing changed.