3

I've just started getting the following warning (or rather, two warnings) on my console:

** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.

What do they mean?

More precisely, typesetting:

%!TEX TS-program = xelatex
\documentclass[a4paper]{report}
\usepackage{amsmath,mathtools,xparse}
%%Greek letters
\makeatletter
\ExplSyntaxOn
\NewDocumentCommand{\@dg}{O{0.88}oO{}}
{\str_if_eq:nnTF{#1}{n}
        {\IfValueTF{#2}
            {#2{\scalebox{0.88}[0.88]{$#3\delta$}}}
            {\errmessage{Too few arguments}\errhelp{If you specify `n' as the first argument, the second optional argument must be specified, otherwise use a number as the first argument or specify no optional argument.}}
        }{\str_if_eq:nnTF{#1}{e}
            {\IfValueTF{#2}
                {#2{\scalebox{0.65}[0.65]{$#3\delta$}}}
                {\scalebox{0.65}[0.65]{$#3\delta$}}
        }{\str_if_eq:nnTF{#1}{b}
                {\IfValueTF{#2}
                    {#2{#3\delta}}
                    {{#3\delta}}
         }{\IfValueTF{#2}
                    {#2{\scalebox{#1}[#1]{$#3\delta$}}}
                    {\scalebox{#1}[#1]{$#3\delta$}}
}}}}
\newcommand{\dg}{\@dg}
\makeatother
\ExplSyntaxOff

\begin{document}
$$\overbracket[0.01pt]{\underline{E_{ii}^2}}^{E_{ii}}+\overbracket[0.01pt]{E_{ii}E_{kk}}^{\dg[n][][\scriptstyle]_{ik}E_{ik}}-\overbracket[0.01pt]{E_{ii}E_{ik}}^{E_{ik}}-\overbracket[0.01pt]{E_{ii}E_{ki}}^{\dg[n][][\scriptstyle]_{ik}E_{ii}}+\overbracket[0.01pt]{E_{kk}E_{ii}}^{\dg[n][][\scriptstyle]_{ik}E_{ki}}+$$
\end{document}

gives:

This is XeTeX, Version 3.1415926-2.5-0.9999.3 (TeX Live 2013)
 restricted \write18 enabled.
entering extended mode
(./gunguMWE.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 78 languages loaded.
(/usr/local/texlive/2013/texmf-dist/tex/latex/base/report.cls
Document Class: report 2007/10/19 v1.4h Standard LaTeX document class
(/usr/local/texlive/2013/texmf-dist/tex/latex/base/size10.clo))
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amstext.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsgen.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsopn.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/mh/mathtools.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/tools/calc.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/mh/mhsetup.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/expl3.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3names.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3bootstrap.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/etex-pkg/etex.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3basics.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3expan.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3tl.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3seq.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3int.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3quark.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3prg.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3clist.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3token.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3prop.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3msg.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3file.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3skip.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3keys.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3fp.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3box.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3coffins.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3color.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3luatex.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3candidates.sty)
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/ifpdf.sty)))
(./gunguMWE.aux)
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/latexconfig/graphics.cfg)
(/usr/local/texlive/2013/texmf-dist/tex/xelatex/xetex-def/xetex.def))
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/graphicx.sty) [1]
(./gunguMWE.aux)
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: height=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: height=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: height=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: height=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: height=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
** WARNING ** Too thin line: width=655 (0.00995717 bp)
** WARNING ** Please consider using "-d" option.
 )
Output written on gunguMWE.pdf (1 page).
SyncTeX written on gunguMWE.synctex.gz.
Transcript written on gunguMWE.log.

Interestingly enough, with pdfTeX I get:

This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013)
 restricted \write18 enabled.
entering extended mode
(./gunguMWE.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 78 languages loaded.
(/usr/local/texlive/2013/texmf-dist/tex/latex/base/report.cls
Document Class: report 2007/10/19 v1.4h Standard LaTeX document class
(/usr/local/texlive/2013/texmf-dist/tex/latex/base/size10.clo))
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amstext.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsgen.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/amsmath/amsopn.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/mh/mathtools.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/tools/calc.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/mh/mhsetup.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/expl3.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3names.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3bootstrap.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/etex-pkg/etex.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3basics.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3expan.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3tl.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3seq.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3int.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3quark.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3prg.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3clist.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3token.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3prop.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3msg.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3file.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3skip.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3keys.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3fp.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3box.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3coffins.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3color.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3luatex.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/l3kernel/l3candidates.sty)
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/ifpdf.sty)))
(./gunguMWE.aux)
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/local/texlive/2013/texmf-dist/tex/latex/latexconfig/graphics.cfg)
(/usr/local/texlive/2013/texmf-dist/tex/latex/pdftex-def/pdftex.def
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/infwarerr.sty)
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/ltxcmds.sty)
(/usr/local/texlive/2013/texmf-dist/tex/context/base/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
))) (/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/pdftexcmds.sty
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/ifluatex.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/oberdiek/epstopdf-base.sty
(/usr/local/texlive/2013/texmf-dist/tex/latex/oberdiek/grfext.sty
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/kvdefinekeys.sty))
(/usr/local/texlive/2013/texmf-dist/tex/latex/oberdiek/kvoptions.sty
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/kvsetkeys.sty
(/usr/local/texlive/2013/texmf-dist/tex/generic/oberdiek/etexcmds.sty)))
(/usr/local/texlive/2013/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))
(/usr/local/texlive/2013/texmf-dist/tex/latex/graphics/graphicx.sty) [1{/usr/lo
cal/texlive/2013/texmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./gunguMWE.aux
) )</usr/local/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi10.pf
b></usr/local/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi5.pfb>
</usr/local/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi7.pfb></
usr/local/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb></us
r/local/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm/cmr7.pfb></usr/l
ocal/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy10.pfb>
Output written on gunguMWE.pdf (1 page, 46192 bytes).
SyncTeX written on gunguMWE.synctex.gz.
Transcript written on gunguMWE.log.

that's to say, the warnings vanish. Since I've given all the console messages, could you tell me also what ll. 2-3 mean? And am I right in guessing the last lines in the pdfTeX version, just before Output written on, have to do with font definitions? And how are they dealt with with XeTeX?

Martin Schröder
  • 15,156
MickG
  • 5,426
  • 4
    Minimal example, please. – egreg Apr 20 '14 at 16:00
  • 1
    What are you trying to achieve by specifying a line width of 0.01pt (which gets "translated" to 0.00995717 bp in the typesetting run -- for the overbracket lines? – Mico Apr 20 '14 at 16:57
  • I want very thin lines. Is there any problem in that? Shouldn't the conversion be 0.01pt = 0.0099626400000099626403...bp or something like that? – MickG Apr 20 '14 at 17:06
  • 3
    @MickG: Please show us a device that can display such thin lines (you want lines that are 0,0035mm wide). Anyway: It's just a warning. – Martin Schröder Apr 20 '14 at 17:14
  • @MartinSchröder OK I exaggerated. And I know it's just a warning, as the title of the question clearly states. But since TeX is trying to tell me something, I'd like to understand its language. The exaggeration is probably due to the fact I don't have a clear idea of what a pt is. How many cm is a pt? And what is the -d option? Thx for the answer anyway. – MickG Apr 20 '14 at 17:21
  • 1
    Regarding units: http://tex.stackexchange.com/questions/8260/what-are-the-various-units-ex-em-in-pt-bp-dd-pc-expressed-in-mm – Torbjørn T. Apr 20 '14 at 17:22

1 Answers1

4

The warning comes from (x)dvipdfmx. The code in question is

if (width > height) {
  /* NOTE:
   *  A line width of 0 denotes the thinnest line that can be rendered at
   *  device resolution. See, PDF Reference Manual 4th ed., sec. 4.3.2,
   *  "Details of Graphics State Parameters", p. 185.
   */
  if (height < dev_unit.min_bp_val) {
    WARN("Too thin line: height=%ld (%g bp)", height, width_in_bp);
    WARN("Please consider using \"-d\" option.");
  }
  len += dev_sprint_line(format_buffer+len,
                         height,
                         xpos,
                         ypos + height/2,
                         xpos + width,
                         ypos + height/2);
} else {
  if (width < dev_unit.min_bp_val) {
    WARN("Too thin line: width=%ld (%g bp)", width, width_in_bp);
    WARN("Please consider using \"-d\" option.");
  }
  len += dev_sprint_line(format_buffer+len,
                         width,
                         xpos + width/2,
                         ypos,
                         xpos + width/2,
                         ypos + height);
}

from pdftex.dev.

So you are trying to draw a line that's too thin to be printable. The message also hints at the -d option:

-d number       Set PDF decimal digits (0-5) [2]

So the number is also too small for dvipdfmx to print since it needs more digits than currently configured; -d 5 might help (I don't know how to set that with xetex).

Martin Schröder
  • 15,156