Text Formatting ⇒ Center a very long chapter tile

[Mimi]

Hello!

Below is my MWE.

Code: Select all

\documentclass{report}

\usepackage{titlesec}
\titleformat{\chapter}[hang]
{\normalfont\normalsize\bfseries\centering}{\chaptertitlename\ \thechapter:}{2mm}{}

\begin{document}
\chapter{The big black bug bit the big black bear, but the big black bear bit the big black bug back!}
\end{document}

I would like to have the second line of the chapter title to be in the center of the page.

[Johannes_B]

Both are typeset in different boxes, so you manually need to break the lines.

Code: Select all

\documentclass{report}

\usepackage{showframe}
\usepackage{titlesec}
\titleformat{\chapter}[hang]
{\normalfont\normalsize\bfseries\centering}{\chaptertitlename\
\thechapter:}{2mm}{}
\newlength{\chapterindent}
\newcommand{\gethalfwidth}{\settowidth{\chapterindent}{\bfseries\chaptertitlename\
\thechapter:}%
\addtolength{\chapterindent}{2mm}
}
\begin{document}
\newcommand{\breakline}{\\\gethalfwidth\hspace{-\chapterindent}\ignorespaces}
\chapter{The big black bug bit the big
	black bear, but the big\breakline
bear bit the big black bug back!}

\setcounter{chapter}{20}
\chapter{The fox, and the duck, and another small animal,
but\breakline also a big red elephant are walking down the road
to\breakline happiness}
\end{document}

[Mimi]

谢谢你的帮助!

[Johannes_B]

If google translate works properly; i respond to that with: No problem