如何在矩形内指定位置绘制标签？

Question

如何在左下角矩形内的指定位置绘制标签？目标是实现这一点（标签“A1”）：

Answer 1

这是使用和锚点的选项fit：

\documentclass[border=10pt]{standalone}
\usepackage[T1]{fontenc}
\usepackage[siunitx, RPvoltages]{circuitikz}
\usetikzlibrary{fit}
\begin{document}
\begin{tikzpicture}[]
    % suppose this is the part of circuit of interest
    \draw (0,3) -- ++(2,0)  (0,0) -- ++(2,0);
    \draw (1,3) coordinate(up) to[generic, name=z1, *-*] (1,0) coordinate(down);
    \node [font=\footnotesize] at (z1.center){$Z_1$};
    % add an auto-fitting node for the dashed part
    \node [draw, dashed, fit=(up) (down) (z1), inner xsep=0.5cm,
        inner ysep=0.8cm](dashed box){};
    % notice that `above right` is the same as `anchor=south west`
    \node [draw, thick, font=\tiny\ttfamily, outer sep=1mm, above right]
        at (dashed box.south west) {A1};
\end{tikzpicture}
\end{document}

Answer 2

像这样：

代码：

\documentclass[border=10pt]{standalone}

\usepackage{tikz}

\begin{document}
    \begin{tikzpicture}
        \draw[dashed] (-3.25,-5.25) rectangle (3.25,5.25);
        \draw[line width=2pt] (-4,4)--(4,4);
        \draw[line width=2pt] (4,4.2)--(4,3.8);
        \draw[line width=2pt] (-4,-4)--(4,-4);
        \filldraw[line width=2pt] (0,-4) circle(3pt)--(0,4) circle(3pt);
        \filldraw[fill=white,draw,line width=2pt] (-.5,-1) rectangle (.5,1);
        \draw (0,0) node () {\Large \bfseries $Z_1$};
        \draw[line width=2pt] (-3,-5) rectangle (-2,-4.25);
        \draw (-2.5,-4.6) node () {\Large \bfseries $A1$};
    \end{tikzpicture}
\end{document}