[Tex/LaTex] How to change the chapter header font/layout

fontssectioning

I'm trying to make a chapter header style to mimic the image as follows:

enter image description here

I've got the following code currently, but not sure how to get the line in the middle, and the title of the chapter to be below the chapter number.

\documentclass{book}
\usepackage{titlesec, blindtext, color}

\usepackage{titlesec}
\titleformat{\chapter}{\Huge}{\Large CHAPTER \Huge\thechapter\newline}{0pt}{\Huge}

\begin{document}
    \chapter{Turing Machines}
\end{document}

Also related to this task: I'd like to know if there's any way to selectively customize the font of a section header without having to change the default font of the whole document. I'm using pdflatex on Windows via MiKTeX, and one package I tried – I forget the name of it now, but I think it might have been fontspec – wouldn't work with pdflatex.

Best Answer

I have a little code that I took from a German website some times ago (I can not find it to reference sadly). With a little modification it is partially similar to what you are looking for. Maybe it can be a good starting point:

\documentclass{scrbook}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{xcolor}
\colorlet{chapter}{cyan}

\addtokomafont{chapter}{\color{chapter}}

\makeatletter
\renewcommand*{\chapterformat}{
  \begingroup
  \setlength{\unitlength}{1mm}
    \begin{picture}(40,30)(0,5)
        \setlength{\fboxsep}{0pt}
        \put(0,15){\line(1,0){\dimexpr
                \textwidth-1\unitlength\relax\@gobble}}
            \put(40,15){\makebox(\dimexpr
            \textwidth-20\unitlength\relax\@gobble,\ht\strutbox\@gobble)[l]{
            \ \normalsize\color{cyan}\chapapp~\thechapter\autodot
          }}
    \end{picture}
  \endgroup
}
\makeatother

\begin{document}
    \chapter{Alan Turing}
\end{document}

enter image description here

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