如何使电路居中？

Question

我遇到了以下问题：当我使用 circuitikz 绘制电路时，我无法在电路侧面添加一些图形来使其居中。看看我的代码。问题是环境将电路和红线视为同一个图形，因此 latex 同时将它们居中。我想要做的是将电路置于 \textwidth 中间，然后将红线及其标签放在居中电路的侧面。可以吗？这是代码：

\documentclass[a4 paper]{book}

\usepackage{tikz}
\usepackage{circuitikz}

\begin{document}
This is the circuit This is the circuit This is the circuit This is the circuit 
\begin{figure}[h]
\centering
\begin{circuitikz}
 \draw (0,0) to [sI](0,2)--(3,2)to[generic](3,0)--(0,0);
 \draw[->,red](-0.6,0.5)--(-0.6,1.5)node
  [red, left, midway]{$Current$};
\end{circuitikz}
\end{figure}
\end{document}

Answer 1

当然可以。如果你把东西放在overlay范围内，它不会被考虑在边界框的确定中，因此不会影响电路的位置。从道德上讲，这与samcarter 最近的回答，其中pgfinterruptboundingbox使用了 ，效果相同。为了说明，我还标出了页面的文本区域以及中间部分，并overlay与进行比较overlay。

\documentclass[a4 paper]{book}

\usepackage{tikz}
\usepackage{circuitikz}
\usepackage{tikzpagenodes} % only for illustration
\begin{document}
This is the circuit This is the circuit This is the circuit This is the circuit 
\begin{figure}[h]
\centering
\begin{circuitikz}
 \draw (0,0) to [sI](0,2)--(3,2)to[generic](3,0)--(0,0);
 \begin{scope}[overlay]
 \draw[->,red](-0.6,0.5)--(-0.6,1.5)node
  [red, left, midway]{Current};
 \end{scope} 
\end{circuitikz}
\caption{With \texttt{overlay}.}
\end{figure}

\begin{figure}[h]
\centering
\begin{circuitikz}
 \draw (0,0) to [sI](0,2)--(3,2)to[generic](3,0)--(0,0);
 \draw[->,red](-0.6,0.5)--(-0.6,1.5)node
  [red, left, midway]{Current};
\end{circuitikz}
\caption{Without \texttt{overlay}.}
\end{figure}
% only for illustration
\begin{tikzpicture}[overlay,remember picture]
  \draw[blue] (current page text area.north)  -- (current page text area.south);
  \draw[blue] (current page text area.north west)  rectangle 
  (current page text area.south east);
\end{tikzpicture}

\end{document}