将标签与节点对齐的正确方法 tikz

Question

考虑以下代码：

\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{calc}

\begin{document}
\begin{tikzpicture}

\coordinate (A) at (1,1);
\coordinate (B) at (2,2);

\draw[->] (A) -- (B);

\draw[dashed] (0,0) rectangle (3,3) node (C) {};

\draw [solid] ($(A.south west)-(0,1.5)$) -- ++(0.5, 0) node [label =right:Signalling] {};

\end{tikzpicture}
\end{document}

我如何才能以自动化的方式正确地将标签的末端与矩形的边缘对齐？

Answer 1

两个选择；

使用 TikZ，您可以使用节点的名称以供以后在此上下文中使用；

\documentclass[tikz]{standalone}
\begin{document}

\begin{tikzpicture}
\coordinate (A) at (1,1);
\coordinate (B) at (2,2);
\draw[->] (A) -- (B);
\draw[dashed] (0,0) rectangle (3,3) node (C) {};

\draw node[% Note that we are inside a path not inside a node declaration
     anchor=east,
     append after command={([xshift=-2mm]\tikzlastnode.west) -- ++ (-0.5,0)}, 
     inner sep=0] at (3,-0.5) {Signalling};

\end{tikzpicture}
\end{document}

或者通过pgfplots实际绘制一个函数而不是将其作为路径给出；

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
axis line style=dashed,
xtick=\empty,
ytick=\empty,
legend pos={south east}
]
\addplot[->,domain=1:2] {x};\addlegendentry{Signalling}
\end{axis}
\end{tikzpicture}
\end{document}