[Tex/LaTex] Title between lines

chaptersrulessectioningtitlesec

So I want to have one line above and one under the title of a chapter in scrreprt, like:

_________________________________________________
1. Introduction
_________________________________________________

But with the same space between the lines and the title.

So this is what I've tried with the package titlesec:

\titleformat{\section}[display]
{}
{}
{}
{\titlerule
  \vspace{0.2pc}%
\thesection\bfseries\hspace{5pt}\filright}
[\vspace{0.1pc}%
  \titlerule]

But it's still not working fine, e.g. at the begining of one chapter on a new page there is a lot of space between the top margin and the chapter name and I only get the number of the chapter in a good position with \hspace{5pt}.

Between: Is there any chance to have the same code for srreprt and scrbook? (after replacing \section by \chapter etc.)

Anybody could help me?

Best Answer

In the MWE below I've used

\titleformat{\chapter}[display]
{\normalfont\Large\bfseries}
{\titlerule
\vspace{1pc}%
\LARGE\thechapter\hskip 9pt#1}
{1pc}
{\titlerule
\vspace{1pc}%
\Huge}

to give

screenshot

and 

\titlespacing{\chapter}{0pt}{*4}{-0.1cm}

to adjust the spacing. you can tweak this necessary :)

\documentclass{scrreprt}

\usepackage[explicit]{titlesec}                     % customize section headings
\usepackage{lipsum}

% custom chapter
\titleformat{\chapter}[display]
{\normalfont\Large\bfseries}
{\titlerule
\vspace{1pc}%
\LARGE\thechapter\hskip 9pt#1}
{1pc}
{\titlerule
\vspace{1pc}%
\Huge}

% custom section
\titleformat{\section}
{\normalfont\Large\bfseries}
{\llap{\thesection\hskip 9pt}#1}
{0pt}
{}

% From the titlesec package
% \titlespacing{command}{left spacing}{before spacing}{after spacing}[right]
% spacing: how to read {12pt plus 4pt minus 2pt}
%           12pt is what we would like the spacing to be
%           plus 4pt means that TeX can stretch it by at most 4pt
%           minus 2pt means that TeX can shrink it by at most 2pt
%       This is one example of the concept of, 'glue', in TeX
\titlespacing{\chapter}{0pt}{*4}{-0.1cm}
\titlespacing\section{0pt}{12pt plus 4pt minus 2pt}{-5pt plus 2pt minus 2pt}
\titlespacing\subsection{0pt}{12pt plus 4pt minus 2pt}{-6pt plus 2pt minus 2pt}
\titlespacing\subsubsection{0pt}{12pt plus 4pt minus 2pt}{-6pt plus 2pt minus 2pt}

\begin{document}

\chapter{Introduction}

\end{document}
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