自动设置 tikz 路径长度

Question

我有以下 MWE：

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\usetikzlibrary{shapes.arrows}
\usetikzlibrary{calc}
\usetikzlibrary{circuits.logic.US,positioning}

\begin{document}
    \begin{tikzpicture}[circuit logic US]

    \node[rectangle, draw] (R) at (0,0){$R$};
    \draw node[xor gate, right of=R](X){};

    % How to automatically set this condition such that the end point touches border of R?
    \path[black, draw] (X.input 1) -- ($(X.input 1)+(-.3,0)$); 

    \end{tikzpicture}
\end{document}

输出：

R我需要帮助来设置连接和的路径X，以使其接触R。

Answer 1

你可以使用

\path[black, draw] (X.input 1) -- (X.input 1-|R.east);

代码：

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{circuits.logic.US}

\begin{document}
\begin{tikzpicture}[circuit logic US]

  \node[rectangle, draw] (R) at (0,0){$R$};
  \draw node[xor gate, right of=R](X){};

  \path[black, draw] (X.input 1) -- (X.input 1-|R.east);% <- changed

\end{tikzpicture}
\end{document}