页面宽度的颜色框，包括边距

Question

我想要制作如下图所示的标题：

但我不知道如何强制颜色框在边缘溢出。我得到的最好的结果是：

我尝试使用\hspace但它只移动文本：

\documentclass[a4paper,10pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage[francais]{babel}
\usepackage{slantsc}
\usepackage{array}
\usepackage{multirow}
\pagestyle{empty}
\usepackage[T1]{fontenc}

\usepackage[default]{raleway}
\usepackage{amssymb}
\usepackage{layout}

\usepackage{fancyhdr}
\pagestyle{fancyplain}

\usepackage{xcolor}
\definecolor{myblue}{RGB}{0,100,200}

\fboxsep0pt

\setlength{\hoffset}{-26pt}
\setlength{\voffset}{-36pt}
\setlength{\oddsidemargin}{10pt}
\setlength{\topmargin}{10pt}
\setlength{\headheight}{100pt}
\setlength{\headwidth}{451pt}
\setlength{\headsep}{30pt}
\setlength{\textheight}{678pt}
\setlength{\textwidth}{451pt}
\setlength{\marginparsep}{10pt}
\setlength{\marginparwidth}{26pt}
\setlength{\footskip}{10pt}

\lhead{
\colorbox{myblue}{\parbox[b]{21cm}{\Huge Some text in my header.}}
}
\cfoot{}
\renewcommand{\headrulewidth}{0pt}

\begin{document}
\noindent Text of my document.
\end{document}

当我尝试时hspace：

\colorbox{myblue}{\hspace{-50pt}\parbox[b]{21cm}{\Huge Some text in my header.}}

\hspace我之前也尝试过，\colorbox但是在这种情况下，没有效果。

Answer 1

您需要计算您在页面上的位置，以便正确地“跳转”（左/右）。为此，您可以使用以下方法保存当前左边距位置zref的savepos模块。

\documentclass{article}
\usepackage{fancyhdr,xcolor,zref-savepos}
\AtBeginDocument{\zsavepos{lmarginmark}}% Store left margin mark
\fancyhf{}
\makeatletter
\lhead{\leavevmode\rlap{%
  \hspace*{-\zposx{lmarginmark}sp}% Adjust to left side of page
  \colorbox{blue}{% blue box
    \makebox[\dimexpr\pdfpagewidth-2\fboxsep][l]{% blue box width
      \hspace*{\zposx{lmarginmark}sp}% Shift back to left margin
      Some header}}}}
\makeatother
\pagestyle{fancy}
\begin{document}
\noindent Text of my document.
\end{document}

我已经包含了使用 的计算\fboxsep，尽管你似乎将这些设置为0pt

Answer 2

如果您愿意，可以使用该tcolorbox包来解决：

\documentclass[a4paper,10pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage[francais]{babel}
\usepackage{slantsc}
\usepackage{array}
\usepackage{multirow}
\pagestyle{empty}
\usepackage[T1]{fontenc}

\usepackage[default]{raleway}
\usepackage{amssymb}
\usepackage{layout}

\usepackage{fancyhdr}
\pagestyle{fancyplain}

\usepackage{xcolor}
\definecolor{myblue}{RGB}{0,100,200}

\usepackage{tcolorbox}

\fboxsep0pt

\setlength{\hoffset}{-26pt}
\setlength{\voffset}{-36pt}
\setlength{\oddsidemargin}{10pt}
\setlength{\topmargin}{10pt}
\setlength{\headheight}{100pt}
\setlength{\headwidth}{451pt}
\setlength{\headsep}{30pt}
\setlength{\textheight}{678pt}
\setlength{\textwidth}{451pt}
\setlength{\marginparsep}{10pt}
\setlength{\marginparwidth}{26pt}
\setlength{\footskip}{10pt}

\lhead{%
\begin{tcolorbox}[size=tight,oversize,
  sharp corners,
  colback=myblue,
  colframe=myblue,
  left=56pt,
  right=90pt,
  fontupper=\Huge]
Some text in my header.
\end{tcolorbox}}
\cfoot{}
\renewcommand{\headrulewidth}{0pt}

\begin{document}
\noindent Text of my document.
\end{document}

只是为了好玩，我在文本上方和下方做了一个替代方案，并增加了渐变：

\documentclass[a4paper,10pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage[francais]{babel}
\usepackage{slantsc}
\usepackage{array}
\usepackage{multirow}
\pagestyle{empty}
\usepackage[T1]{fontenc}

\usepackage[default]{raleway}
\usepackage{amssymb}
\usepackage{layout}

\usepackage{fancyhdr}
\pagestyle{fancyplain}

\usepackage{xcolor}
\definecolor{myblue}{RGB}{0,100,200}

\usepackage[skins]{tcolorbox}

\fboxsep0pt

\setlength{\hoffset}{-26pt}
\setlength{\voffset}{-36pt}
\setlength{\oddsidemargin}{10pt}
\setlength{\topmargin}{10pt}
\setlength{\headheight}{100pt}
\setlength{\headwidth}{451pt}
\setlength{\headsep}{30pt}
\setlength{\textheight}{678pt}
\setlength{\textwidth}{451pt}
\setlength{\marginparsep}{10pt}
\setlength{\marginparwidth}{26pt}
\setlength{\footskip}{10pt}

\lhead{%
\begin{tcolorbox}[size=tight,oversize,
  sharp corners,
  enhanced,
  interior style={top color=myblue!50!white,bottom color=myblue},
  colframe=myblue,
  colupper=myblue!20!white,
  left=56pt,
  right=90pt,
  bottom=4pt,
  top=20pt,
  fontupper=\Huge]
Some text in my header.
\end{tcolorbox}}
\cfoot{}
\renewcommand{\headrulewidth}{0pt}

\begin{document}
\noindent Text of my document.
\end{document}