TArrow missing the endpoint

ROOT
1

hi all

i’m using root version 5.27/06b and i’m using TArrow for the first time. when i draw it, though, the endpoint (the triangle) is not draw. i only seem to obtain a line.

here is a test program i use:


// BEGIN
#include "TH1D.h"
#include "TArrow.h"
#include "TCanvas.h"


int main () {

  TH1D* h1 = new TH1D("test", "", 100, -5., 5. );
  h1->FillRandom("gaus", 10000);
  h1->SetFillStyle(3004);
  h1->SetFillColor(39);
  h1->SetLineColor(39);
  h1->SetLineWidth(2.);

  TArrow* arrow_obs = new TArrow( 3.5, 300., 3.5, 0., 0.1, ">" );
  arrow_obs->SetLineColor(46);
  arrow_obs->SetFillColor(46);
  arrow_obs->SetLineWidth(2.);

  TCanvas* c1 = new TCanvas("c1", "", 600, 600);
  c1->cd();

  h1->Draw();
  arrow_obs->Draw("same");

  c1->SaveAs("arrow.eps");

  return 0;

}

// END

and here is the result i get: /afs/cern.ch/user/p/pandolf/public/arrow.eps

i must be doing something wrong. i tried also other options, such as “|->” and “<”, but nothing changed.

can someone help?

thanks
f

2

arrow_obs->Draw();

3

remove the option “same”.