Ways to modify chapter titles in KOMA-class

Question

I am using KOMA-class. Let's say I want my chapter titles to look like this:

However the closest thing I can get is this:

The code I used is this:

\documentclass{scrbook}

\usepackage{kantlipsum} %providing dummy text
\usepackage{adforn} %providing ornaments

\RedeclareSectionCommand[style=section,indent=0pt,beforeskip=2\baselineskip]{chapter}
\setkomafont{chapter}{\normalfont\large\scshape}
\renewcommand*{\raggedsection}{\centering}
\renewcommand*{\chapterformat}{\adforn{36}\enskip\thechapter.\ }

\begin{document}

    \kant[1]

    \chapter{An Interesting Chapter Title}

    \kant[2]

    \begin{center}
        \vspace{\baselineskip}
        \scshape\large \adforn{36}\enskip 1. An Interesting Chapter Title\enskip\adforn{36}
        \\
        \rule{2em}{1pt}
    \end{center}

    \noindent\kant[3]


\end{document}

Things I already modified:

1. The font for the chapter title.
2. Centering.
3. Not starting a new page.
4. Vertical space before the title.

But I don't know how to add characters or even a new line after the actual chapter title is printed.

I would also like to know about further ways than those I already used, KOMA-classes provide to change chapter titles (whether it makes sense to use them is another thing).

Edit: As schtandard remarked, one has to make a decision how the title should look when it takes several lines. So let's see for example if we can get the following to work:

My code (which is certainly terrible):

    \begin{center}
        \vspace{\baselineskip}
        \scshape\large
        \adforn{36}\hspace{-1em}
        \parbox{11cm}{\centering 1. An Interesting Chapter Title Which is Way Too Long to Fit in One Line}
        \hspace{-1em}\adforn{36}
        \\[\baselineskip]
        \rule{2em}{1pt}
    \end{center}

Note that here the box has a fixed length of 11cm which is fine for taking the picture, but in practice, one should be able to specify a maximal width so that the box becomes shorter if the title is short.

Answer 1

If you use style=section for chapters then you have to redefine \sectionlinesformat to change the layout for chapter titles:

\documentclass{scrbook}
\usepackage{kantlipsum} %providing dummy text
\usepackage{adforn} %providing ornaments

\RedeclareSectionCommand[style=section,indent=0pt,beforeskip=-2\baselineskip]{chapter}
\setkomafont{chapter}{\normalfont\large\scshape}
\renewcommand*{\raggedchapter}{\centering}

\usepackage{varwidth}
\makeatletter
\renewcommand\sectionlinesformat[4]{%
  \ifstr{#1}{chapter}
    {%
      \raggedchapter
      \adforn{36}\enskip
      \begin{varwidth}{\dimexpr\textwidth-6em\relax}
        \raggedchapter#3#4%
      \end{varwidth}%
      \enskip\adforn{36}%
      \par\nobreak
      \strut\rule{2em}{1pt}%
      \par
    }
    {\@hangfrom{\hskip#2#3}{#4}}% original definition for other section levels
}
\makeatother

\begin{document}
\kant[1]
\chapter{An Interesting Chapter Title}
\kant[2]
\chapter{An Interesting Chapter Title Which is Way Too Long to Fit in One Line}
\kant[3]
\end{document}

Answer 2

\documentclass{scrbook}

\usepackage{etoolbox}

\usepackage{kantlipsum} %providing dummy text
\usepackage{adforn} %providing ornaments

\makeatletter
    % \RedeclareSectionCommand[beforeskip=2\baselineskip]{chapter} % <-- this seems too little
    \setkomafont{chapter}{\normalfont\large\scshape}
    \renewcommand*{\raggedchapter}{\centering}
    \renewcommand*{\chapterformat}{\thechapter.\ }
    \patchcmd\scr@startchapter{\if@openright\cleardoublepage\else\clearpage\fi}{}{}{}

    \newbox\@chapter@heading@testbox
    \renewcommand\chapterlinesformat[3]{%
        \savebox\@chapter@heading@testbox{#2#3}%
        \ifdim\wd\@chapter@heading@testbox>\dimexpr\linewidth-6em\relax
            \raggedchapter
            \adforn{36}\hskip 1em%
            \parbox{\dimexpr\linewidth-6em}{%
                \raggedchapter
                #2#3
            }%
            \hskip 1em\adforn{36}
            \@@par
        \else
            \parbox{\linewidth}{%
                \raggedchapter%
                \adforn{36}\hskip 1em%
                {\let\@@par\relax
                    #2#3%
                }%
                \hskip 1em\adforn{36}%
            }%
            \@@par
        \fi
        \raggedchapter\strut\rule{2em}{.4pt}\par%
    }
\makeatother

\begin{document}

\kant[1]

\chapter{An Interesting Chapter Title}

\kant[2]

\chapter{An Interesting Chapter Title Which is Way Too Long to Fit in One Line}

\kant[3]

\end{document}

What is happening here?

• Chapter is not redeclared to be of type section.
• The pagebreaks are instead avoided by removing the appropriate code from \scr@startchapger using \patchcmd from etoolbox.
• We now use \chapterlinesformat to format the chapter heading (#2 contains the formatted chapter number, #3 the formatted chapter title).
• We first check if the heading is longer than one line and then typeset it accordingly.
• #3 contains a \@@par. Since we want to have the second ornament on the same line as the title, we need to deactivate it before typesetting in the case of a single line heading.
• The \strut on the line with the \rule makes sure it has the correct distance from the heading in the case of multiple lines.

Please note that as a consequence of centering your headings, the second (and subsequent) lines of the chapter title may flow below the chapter number.

Answer 3

A bit of a hack, but one thing that worked for me for single line titles was adding

\newcommand{\mychapter}[1]{%
    \addtocounter{chapter}{1}%
    \chapter*{\chapterformat #1\enskip\adforn{36}}%
    \addcontentsline{toc}{chapter}{\thechapter.\ #1}
    \vspace{-2\baselineskip}%
    \begin{center}
        \rule{2em}{1pt}
    \end{center}
}

after '\renewcommand{\chapterformat}...'. And then of course use \mychapter instead of \chapter.
But I feel there must be a better way... (adding the formatting in a "\renewcommand{chapterlinesformat}" did not have any effect for me)

From what I've found, packages that allow adapting headers are usually limited to selecting fonts and font styles, they do not provide for modification of the chapter title contents, which is what you need here for the second leaf.