Change in text size between ROOT versions

[vepadulano]

Check duplicate issues.

• Checked for duplicates

Description

The reproducer creates an image with a different size of the axis labels depending on the ROOT version. The size is set via SetTextSize(tsize) where tsize==21. With this parameter:

• ROOT 6.38 shows a reasonable label size

• ROOT master shows a huge text size such that the labels become invisible in the canvas

• For context, in ROOT master a somewhat reasonable text size can be achieved with SetTextSize(0.05), but see also the wrong positioning of the labels in the attached image

Note

If in the reproducer below one comments out the lines

  // style.SetLabelFont(font, "x");
  // style.SetTitleFont(font, "x");
  // style.SetLabelFont(font, "y");
  // style.SetTitleFont(font, "y");
  // style.SetLabelFont(font, "z");
  // style.SetTitleFont(font, "z");

Then the huge labels appear also in 6.38.

Reproducer

#include <iostream>

#include <TH1D.h>
#include <TStyle.h>
#include <TCanvas.h>
#include <TROOT.h>

void repro()
{
  TStyle style{"MyStyle", "MyStyle"};

  // use plain black on white colors
  Int_t icol = 0; // WHITE
  style.SetFrameBorderMode(icol);
  style.SetFrameFillColor(icol);
  style.SetCanvasBorderMode(icol);
  style.SetCanvasColor(icol);
  style.SetPadBorderMode(icol);
  style.SetPadColor(icol);
  style.SetStatColor(icol);

  // set the paper & margin sizes
  style.SetPaperSize(20, 26);

  // set margin sizes
  style.SetPadTopMargin(0.05);
  style.SetPadRightMargin(0.05);
  style.SetPadBottomMargin(0.16);
  style.SetPadLeftMargin(0.16);

  // set title offsets (for axis label)
  style.SetTitleXOffset(1.4);
  style.SetTitleYOffset(1.4);

  // use large fonts
  Int_t font = 43;
  Double_t tsize = 21;
  style.SetTextFont(font);
  style.SetTextSize(tsize);

  style.SetLabelFont(font, "x");
  style.SetTitleFont(font, "x");
  style.SetLabelFont(font, "y");
  style.SetTitleFont(font, "y");
  style.SetLabelFont(font, "z");
  style.SetTitleFont(font, "z");

  style.SetLabelSize(tsize, "x");
  style.SetTitleSize(tsize, "x");
  style.SetLabelSize(tsize, "y");
  style.SetTitleSize(tsize, "y");
  style.SetLabelSize(tsize, "z");
  style.SetTitleSize(tsize, "z");

  style.SetLegendFont(font);

  // use bold lines and markers
  style.SetMarkerStyle(20);
  style.SetMarkerSize(1.2);
  style.SetHistLineWidth(2.);
  style.SetLineStyleString(2, "[12 12]"); // postscript dashes

  // get rid of X error bars
  // get rid of error bar caps
  style.SetEndErrorSize(0.);

  // do not display any of the standard histogram decorations
  style.SetOptTitle(0);
  style.SetOptStat(0);
  style.SetOptFit(0);

  // put tick marks on top and RHS of plots
  style.SetPadTickX(1);
  style.SetPadTickY(1);

  gROOT->SetStyle("MyStyle");
  gROOT->ForceStyle();
  gStyle->SetErrorX(0.5);

  TH1D h("", "", 1, 0, 1);
  h.Fill(0.5);

  TCanvas c("", "", 800, 600);

  auto size = h.GetXaxis()->GetLabelSize();
  std::cout << "label size: " << size << "\n";

  h.Draw("HIST");
  c.SaveAs("h.png");
}

int main()
{
  repro();
}

ROOT version

master

Installation method

Any

Operating system

Any

Additional context

No response

[linev]

Was a typo. Should be fixed in #22197