我正在尝试建立线条来显示页面的几何形状。我只想测量current page text area.west和之间的水平分量current page.west。显示距离的线条应current page text area.west current page以水平方式连接，如图所示
\documentclass{elsarticle}
\usepackage{tikz,tikzpagenodes}
\usetikzlibrary{calc,arrows.meta}
\newlength{\widthpageframe}
\setlength{\widthpageframe}{0.1mm}
\newcommand{\opacitypageframe}{0.1}
\newcommand{\pageframeMainText}[2]{%c
\tikz[remember picture,overlay] {
\draw [color=gray, line width=#1, opacity=#2]
(current page text area.south west)
rectangle
(current page text area.north east);
}
}
\begin{document}
\pageframeMainText{\widthpageframe}{\opacitypageframe}
\begin{tikzpicture}[remember picture,overlay, arrows={Latex[length=11pt]}-{Latex[length=11pt]}]
\draw[] let \p1 = ($(current page.west) - (current page text area.west)$), \n1={veclen(\x1,\y1)} in (current page.west) -- node[above, sloped] {\n1} (current page text area.west);
\end{tikzpicture}
\end{document}