更改标题中文本框的形状

Question

我对以下代码有疑问：

    \documentclass[a4paper]{book}
    \setlength\headheight{0cm}

    \usepackage{xcolor}
    \colorlet{headbgcolor}{green!50!blue!70}
    \setlength{\topmargin}{-1.5cm}
    \usepackage{fancyhdr}
    \pagestyle{fancy}
    \renewcommand\chaptermark[1]{\markboth{\chaptername\ \thechapter:\enskip#1}{}}
    \fancyhf{}

    \fancyhead[LE]{%
    \makebox[0pt][r]{
    \colorbox{headbgcolor}{\makebox[\textwidth][r]{\bfseries\textcolor{white}{\thepage}\enskip}}\hspace*{1em}}%
    {\itshape\leftmark}\hspace*{1em}\headrulefill%
    }
    \fancyhead[RO]{%
    \mbox{}\headrulefill \hspace*{1em}{\itshape\leftmark}%
    \makebox[0pt][l]{%
    \hspace*{1em}\colorbox{headbgcolor}{\makebox[\textwidth][l]{\enskip  \bfseries\textcolor{white}{\thepage}}}}%
     }
     \renewcommand\headrulewidth{0pt}

     \def\headrulefill{\leaders\hrule width 0pt height 3pt depth -2.8pt \hfill}

     \usepackage{blindtext}% dummy text

     \fancypagestyle{plain}{
     \fancyhf{}
     \fancyhead[LE]{%
     \makebox[0pt][r]{
     \colorbox{headbgcolor}{\makebox[\textwidth][r]{\bfseries \textcolor{white}{\thepage}\enskip}}\hspace*{1em}}%
{\itshape\leftmark}\hspace*{1em}\headrulefill%
     }
     \fancyhead[RO]{%
     \mbox{}\headrulefill \hspace*{1em}{\itshape\leftmark}%
     \makebox[0pt][l]{%
     \hspace*{1em}\colorbox{headbgcolor}{\makebox[\textwidth][l]{\enskip\bfseries\textcolor{white}{\thepage}}}}%
     }
     }
     \usepackage{mathptmx} 
     \begin{document}
     \blinddocument
     \end{document}

此代码的目的是在每页的页眉中给出一个填充的水平矩形，其中包含页码（矩形所在的页面边会根据页面是奇数页还是偶数页而变化）。我想知道是否有人可以建议对代码进行一些修改，这样，页码就不再位于矩形内，而是位于五边形内，如图所示

Answer 1

以下是具有 TikZ 形状的部分解决方案signal。您必须调整信号长度以达到页面边界。

    \documentclass[a4paper]{book}
    \usepackage{tikz}
    \usetikzlibrary{shapes.symbols}

    \setlength\headheight{0cm}

    \usepackage{xcolor}
    \colorlet{headbgcolor}{green!50!blue!70}
    \setlength{\topmargin}{-1.5cm}
    \usepackage{fancyhdr}
    \pagestyle{fancy}
    \renewcommand\chaptermark[1]{\markboth{\chaptername\ \thechapter:\enskip#1}{}}
    \fancyhf{}

    \fancyhead[LE]{%
    \makebox[0pt][r]{\tikz[baseline] \node[anchor=base, signal, font=\bfseries, text=white, signal to=east, fill=headbgcolor, text width=\marginparwidth, align=right]{\thepage};
\hspace*{1em}}%
    {\itshape\leftmark}\hspace*{1em}\headrulefill%
    }

    \fancyhead[RO]{%
    \mbox{}\headrulefill \hspace*{1em}{\itshape\leftmark}%
    \makebox[0pt][l]{%
    \hspace*{1em}\tikz[baseline] \node[anchor=base, signal, font=\bfseries, text=white, signal to=west, fill=headbgcolor, text width=\marginparwidth, align=left]{\thepage};}%
     }
     \renewcommand\headrulewidth{0pt}

     \def\headrulefill{\leaders\hrule width 0pt height 3pt depth -2.8pt \hfill}

     \usepackage{blindtext}% dummy text

     \fancypagestyle{plain}{
     \fancyhf{}
     \fancyhead[LE]{%
     \makebox[0pt][r]{
     \tikz[baseline] \node[anchor=base, signal, font=\bfseries, text=white, signal to=east, fill=headbgcolor, text width=\marginparwidth, align=right]{\thepage};\hspace*{1em}}%
{\itshape\leftmark}\hspace*{1em}\headrulefill%
     }
     \fancyhead[RO]{%
     \mbox{}\headrulefill \hspace*{1em}{\itshape\leftmark}%
     \makebox[0pt][l]{%
     \hspace*{1em}\tikz[baseline] \node[anchor=base, signal, font=\bfseries, text=white, signal to=west, fill=headbgcolor, text width=\marginparwidth, align=left]{\thepage};}%
     }
     }
     \usepackage{mathptmx} 
     \begin{document}
     \blinddocument
     \end{document}