Cfrgtkky

How do you change the typeface used for the part environment to an Opentype font?

(In the MWE below, I've used a TrueType font, but the method should be the same).

It appears the standard titlesec method for chapter and section headings doesn't work.

Engine is LuaLaTeX.

M(n-)WE:

documentclass[11pt, a4paper]{book}

usepackage[raggedright]{titlesec}

usepackage{fontspec}



newfontfamilypartfont{Verdana.ttf}

titleformat*{part}{partfont}



newfontfamilychapterfont{Verdana.ttf}

titleformat*{chapter}{chapterfont}



begin{document}

    part{Hello world.}

    chapter{Hello again, world.}

end{document}

The part command can't be changed using the “easy” mode. When you compile your code you get this error:

! Package titlesec Error: Not allowed in `easy' settings.



See the titlesec package documentation for explanation.

Type  H <return>  for immediate help.

 ...                                              



l.7 titleformat*{part}{partfont}



? h % < I typed h<return> here

The sectiong command you are trying to redefine

is not handled by the starred variant (eg, part)

? 

You'll have to use the general form of the titleformat macro (i.e. without the *) and replicate the part command from book class. Use this titleformat:

titleformat{part}

  {filcenterhugebfseries} % Format of the section header

  {partnamenobreakspacethepart} % Format of the “Part X” text

  {0pt} % Horizontal space (none, we want vertical)

  {\vspace{20pt}Huge} % Commands before the title part (vertical space of 20 pt and increase in font size

The chapter command allows you to use titleformat*, so your code works.

Now you just have to add in your custom font. I used TeX Gyre Termes for I don't have Verdana.ttf:

documentclass[11pt, a4paper]{book}

usepackage[raggedright]{titlesec}

usepackage{fontspec}



newfontfamilypartfont{Tex Gyre Termes}

titleformat{part}

  {filcenterhugebfseriespartfont}

  {partnamenobreakspacethepart}

  {0pt}

  {\vspace{20pt}Huge}



titleformat{chapter}[display]

{normalfonthugebfseries}{chaptertitlename thechapter}{20pt}{Huge}



newfontfamilychapterfont{Tex Gyre Termes}

titleformat*{chapter}{normalfonthugebfserieschapterfont}



begin{document}

    part{Hello world.}

    chapter{Hello again, world.}

end{document}

Part heading:

Chapter heading: