带有 `fit=(top)(bottom)` 的 Tikz 节点尺寸略有误差

Question

我喜欢通过 TikZ 创建文本框。我首先使用那灵活示例。是的 :) 我确实创建了文本框。就在这儿。

但我还有二问题..

问题 1

我用来fit在文本框左侧创建浅灰色矩形（参考)。但\node(colm)和\node(colm2)略大于\node(BOXCONTENT)。为什么？有什么想法吗？

第二季度

此外，由于我对如何退出环境的了解甚少，我添加了第二个矩形，以便将文本移到节点内的右侧。mybox有没有更好的方法？（我相信有）我尝试使用类似的东西\setlength{\leftmargini}{2pt}，但我仍然对部分感到困惑

...
(BOXCONTENT) {}\bgroup\rule{0pt}{3ex}
}{%
\egroup;
...

不起作用！以下平均能量损失重现了我的结果。

\documentclass[12pt]{standalone}
\usepackage{tikz}
\thispagestyle{empty}
\usetikzlibrary{positioning,fit}

%Define colors
\definecolor{Ccolm}{gray}{0.6}
\definecolor{Cfill}{gray}{0.8}

\newenvironment{mybox}[2][]{%
    \begin{tikzpicture}[#1]%
      %Get the text
        \node [inner sep=1pt,text width=#2,fill=Ccolm,]
            (BOXCONTENT) {}\bgroup\rule{0pt}{3ex}
}{%
        \egroup;

       %Why they are slighlty bigger than their fit!!!
       \coordinate [left=1em of BOXCONTENT.north west] (top);
       \coordinate [left=1em of BOXCONTENT.south west] (bottom);
        \node(colm)    [fit=(top)(bottom),inner sep=0pt,minimum width=1em,fill=Cfill] {};


      %Because I could not shift the text to the left, not a beatufiul solution
       \coordinate [left=0em of BOXCONTENT.north west] (top1);
       \coordinate [left=1em of BOXCONTENT.south west] (bottom2);
       \node(colm2)  [fit=(top1)(bottom2),inner sep=-0pt,minimum width=1.1em,fill=Ccolm] {};
    \end{tikzpicture}
}
\begin{document}
  \begin{mybox}{15em}
      This is the longer content
      This is the longer content
      This is the longer content
      This is the longer content
      This is the longer content
  \end{mybox}
\end{document}

这个有效。代码来自 qtikz

\usetikzlibrary{positioning,fit}
\xdefinecolor{mycolor}{RGB}{62,96,111} % Neutral Blue

\definecolor{Ccolm}{gray}{0.6}
\definecolor{Cfill}{gray}{0.8}
\colorlet{bancolor}{mycolor}


\newenvironment{mybox}[2][]{%
    \begin{tikzpicture}[#1]%
      %

        \node [inner sep=1pt,text width=#2,fill=Ccolm,]
            (BOXCONTENT) \bgroup\rule{0pt}{3ex}{}
}{%
        \egroup;

       %Why they are slighlty bigger than their fit!!!
       \coordinate [left=1em of BOXCONTENT.north west] (top);
       \coordinate [left=1em of BOXCONTENT.south west] (bottom);
        \node(colm)    [fit=(top)(bottom),inner sep=0pt,minimum width=1em,fill=Cfill] {};


      %Because I could not shift the text to the left, not a beatufiul solution
       \coordinate [left=0em of BOXCONTENT.north west] (top1);
       \coordinate [left=1em of BOXCONTENT.south west] (bottom2);
       \node(colm2)  [fit=(top1)(bottom2),inner sep=-0pt,minimum width=1.1em,fill=Ccolm] {};

    \end{tikzpicture}
}


\begin{mybox}{15em}
    This is the longer content
    This is the longer content
    This is the longer content
    This is the longer content
    This is the longer content
\end{mybox}

Answer 1

你应该为每项工作使用适当的工具；-) 这里是tcolorbox

\documentclass[12pt,border=5]{standalone}
\usepackage[most]{tcolorbox}

\newtcolorbox{mybox}[1][]{
  enhanced,
  colframe=gray!80,
  colback=gray!40,
  left=2em,right=1ex,top=1ex,bottom=1ex,%boxsep=1em,
  leftrule=4pt,
  rightrule=0pt,
  toprule=0pt,
  bottomrule=0pt,
  arc=0pt,
  %breakable,      %% you may like these three lines
%  nobeforeafter,
%  enhanced jigsaw,
  #1}

\begin{document}
  \begin{mybox}[width=15em]
    This is the longer content
      This is the longer content
      This is the longer content
      This is the longer content
      This is the longer content
  \end{mybox}
\end{document}

关于你的代码，我认为你的做法可能会让你付出很大代价。最好不要这样做。但是，你可以通过添加来消除\node(colm)和\node(colm2)之间的大小差异\node(BOXCONTENT)outer sep=0pt

\node [inner sep=1pt,outer sep=0pt,text width=#2,fill=Ccolm,]
            (BOXCONTENT) \bgroup\rule{0pt}{3ex}{}