设计一个章节样式

怎么设计下面的章节样式：

设计代码：

\documentclass[twoside]{book}
\usepackage{xparse,ifthen}
\usepackage[calcwidth]{titlesec}
\usepackage{changepage}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{fancyhdr}
\usepackage{marginnote}
\usepackage{lettrine}
\usepackage{lipsum}
 
\newlength\mylen
 
\DeclareDocumentCommand\ChapIma{omm}
{\let\cleardoublepage\relax
\ifthenelse{\isodd{\value{page}}}
{\mbox{}\clearpage}{\mbox{}\clearpage\mbox{}\clearpage}%
\resizebox{.9\textwidth}{.9\textheight}{\includegraphics{#3}}
\mbox{}\thispagestyle{empty}\clearpage
\IfNoValueTF{#1}{\chapter{#2}}{\chapter[#1]{#2}}
}
 
\DeclareDocumentCommand\Caption{om}
{\marginnote{\parbox{\marginparwidth}{%
\captionsetup[figure]{labelformat=empty}
\IfNoValueTF{#1}{\captionof{figure}{#2}}{\captionof{figure}[#1]{#2}}
}%
}%
}
 
\titleformat{\chapter}[display]
{\Huge\normalfont\sffamily}{}{2pc}
{\setlength\mylen{0pt}%
\addtolength\mylen{\marginparwidth}%
\addtolength\mylen{\marginparsep}\raggedleft
}
[\vspace{-20pt}%
{%
\begin{adjustwidth}{}{-\mylen}
\makebox[\linewidth][r]{%
\rule{\dimexpr\titlewidth+\mylen\relax}{0.4pt}%
}%
\end{adjustwidth}%
}%
]
\titlespacing*{\chapter}{0pt}{1cm}{7cm}
 
\renewcommand\chaptermark[1]{\markboth{#1}{}}
 
\fancypagestyle{plain}{%
\fancyhf{}
\fancyfoot[OR]{\sffamily\small\MakeUppercase{\leftmark}~~\oldstylenums{\thepage}}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
\fancyfootoffset[OR]{\dimexpr\marginparsep+\marginparwidth\relax}
}
 
\fancyhf{}
\fancyfootoffset[OR]{\dimexpr\marginparsep+\marginparwidth\relax}
\fancyfootoffset[EL]{\dimexpr\marginparsep+\marginparwidth\relax}
\fancyfoot[OR]{\small\sffamily\MakeUppercase{\leftmark}~~\oldstylenums{\thepage}}
\fancyfoot[EL]{\small\sffamily\oldstylenums{\thepage}~~\MakeUppercase{\rightmark}}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
\pagestyle{fancy}
 
\renewcommand\chaptermark[1]{\markboth{#1}{}}
\renewcommand\sectionmark[1]{\markright{#1}}
 
\begin{document}
 
\tableofcontents
 
\ChapIma{Preface}{ctanlion}
\lettrine{T}{his} is some initial text\Caption{This is the caption for the figure; this is just some test text}
\lipsum[1-5]
\ChapIma{Introduction}{ctanlion}
\lipsum[1]
\section{Qu'ran manuscripts}
\lipsum[1-14]
 
\end{document}

选自：http://tex.stackexchange.com/questions/37170/how-can-i-produce-a-fancy-chapter-heading-like-this-one