pgfplot 腳位長度

Question

請考慮手冊中的以下範例pgfplot。

\begin{tikzpicture}
  \tikzset{
    every pin/.style={fill=yellow!50!white,rectangle,rounded corners=3pt,font=\tiny},
    small dot/.style={fill=black,circle,scale=0.3}
  }
  \begin{axis}[
    clip=false,
    title=How \texttt{axis description cs} works
  ]
  \addplot {x};

  \node[small dot,pin=120:{$(0,0)$}]
  \node[small dot,pin=-30:{$(1,1)$}]
  \node[small dot,pin=-90:{$(1.03,0.5)$}]
  \node[small dot,pin=125:{$(0.5,0.5)$}]
  \end{axis}
\end{tikzpicture}

該代碼給出了下圖

我想要改變但在手冊中找不到的是改變引腳的長度。例如，使中間的圖釘文字看起來更接近 y 軸的值 5，並使連接線延伸到該點。我想要的結果如下圖。

這有可能嗎？

Answer 1

您可以使用pin distance：

\documentclass{article}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
  \tikzset{
    every pin/.style={fill=yellow!50!white,rectangle,rounded corners=3pt,font=\tiny},
    small dot/.style={fill=black,circle,scale=0.3}
  }
  \begin{axis}[
    clip=false,
    title=How \texttt{axis description cs} works
  ]
  \addplot {x};

  \node[small dot,pin=120:{$(0,0)$}] at (axis description cs:0,0) {};
  \node[small dot,pin=-30:{$(1,1)$}] at (axis description cs:1,1) {};
  \node[small dot,pin={[pin distance=2cm]125:{$(0.5,0.5)$}}] at (axis description cs:0.5,0.5) {};
  \end{axis}
\end{tikzpicture}

\end{document}