Titles disappear for font precision 3

[klieret]

Hi!

When I use font precision 3 (to give absolute font sizes), the title (of TH1Fs etc.) does no longer show up.

Here’s a quick example:

// -------- SET FONT --------

int font = 43;  // arial, precision 3

gStyle->SetTextFont(font);

gStyle->SetTitleFont(font, "");
gStyle->SetTitleFont(font, "x");
gStyle->SetTitleFont(font, "y");
gStyle->SetTitleFont(font, "z");

gStyle->SetLabelFont(font, "");
gStyle->SetLabelFont(font, "x");
gStyle->SetLabelFont(font, "y");
gStyle->SetLabelFont(font, "z");

gStyle->SetStatFont(font);
gStyle->SetLegendFont(font);

// -------- SET SIZE --------

int size_px = 13;

gStyle->SetTextSize(size_px);

gStyle->SetTitleSize(size_px, "");
gStyle->SetTitleSize(size_px, "x");
gStyle->SetTitleSize(size_px, "y");
gStyle->SetTitleSize(size_px, "z");

gStyle->SetLabelSize(size_px, "");
gStyle->SetLabelSize(size_px, "x");
gStyle->SetLabelSize(size_px, "y");
gStyle->SetLabelSize(size_px, "z");

gStyle->SetStatFontSize(size_px);
gStyle->SetLegendTextSize(size_px);

gStyle->SetTitleFontSize(size_px);

// -------- DRAW SOMETHING --------

auto h = new TH1F("h","test",100,-3,3);
h->FillRandom("gaus",3000);
h->Draw();

Am I doing something wrong?

Any help or just confirming that this is strange/ also happens with other ROOT versions would be much appreciated

Best regards,
Kilian

---

_ROOT Version: _ 6.06/08
Platform: Linux version 4.13.0-45-generic 16.04.1-Ubuntu
Compiler: Not Provided

---

[Wile_E_Coyote]

@couet It seems to me that there is a bug in the calculation of the “Y1” for the “TPaveText title” (in ROOT 5 and 6). From “c1->ls();”, one gets “Y1=-1495.495335” (another coordinates are o.k.). After running the “quick example” macro, try to execute:

gPad->Update(); ((TPaveText*)(gPad->GetPrimitive("title")))->SetY1(gPad->GetUymax()); gPad->Modified(); gPad->Update();

[couet]

I see the problem too. I will check.

[couet]

The following is enough to show the problem:

{
   int font = 43;  // arial, precision 3
   gStyle->SetTitleFont(font, "");

   int size_px = 13;
   gStyle->SetTitleSize(size_px, "");

   auto h = new TH1F("h","Title test",100,-3,3);
   h->FillRandom("gaus",3000);
   h->Draw();
}

[klieret]

@Wile_E_Coyote Thank you for your quick reply! Substituting gPad->GetUymax() for the y coordinate, ((TPaveText*) c1->GetPrimitive("title")))->SetY1(gPad->GetUymax()); c1->Modified(); c1->Update(); seems like a pretty stable workaround. Thank you!

@couet Thanks for confirming that!

Cheers,
Kilian

[couet]

I am fixing this now. Right now the case of “pixel fonts” is ignored when painting the title.

[couet]

This is now fixed in the ROOT master. Thanks for reporting.

[klieret]

Thank you for fixing this!