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我怎样才能让箭头位于带有大头针的正方形的一侧？

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我怎样才能让箭头位于带有大头针的正方形的一侧？

我用大头针将箭头放在正方形的一侧，但是我不能用大头针 (S_2)。

\documentclass[12pt]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\usetikzlibrary{patterns}
\pgfplotsset{compat=1.9}
\usepackage{fouriernc}
\begin{document}
\begin{tikzpicture}

\begin{axis}
    [
    declare function={Y(\x)=\x^3 -6 * \x^2+9*\x;},
axis line style = very thick,
    axis lines = center,
    xlabel=$x$,ylabel=$y$,
        domain=-0.5:5,
        ymin=-0.5,
        ymax=4.5,
        xmin=-1.2,
        xmax=4.95,
        ytick={4},
    samples=100,xtick distance=1,ytick distance=1
,unit vector ratio*=1 1 1,
    width=11cm,
    grid=major,
    grid style={gray!30}]
\addplot [black,  thick,name path =A] {Y(x)};
       \addplot [black, mark=*,only marks,samples at={0,1,3,4}] {Y(x)};
       \node at (axis cs:-0.25, -0.25) {$O$} ;
       \addplot [ thick] coordinates {(4, 0) (4, 4) (0,4)};
\addplot[name path =C,domain=0:4] {4};
\addplot[name path =D,domain=0:4] {0};
\addplot[pattern=north east lines,  domain=0:1,samples=1000] fill between[of=A and D,soft clip={domain=3:4},];
\addplot[pattern=north east lines,  domain=0:1,samples=1000] fill between[of=A and C,soft clip={domain=0:1},];
\begin{scope}[
  every pin edge/.style={thick,<-,>=latex},
  pin distance=1.5cm
]
\node[pin=60:{$S_2$},] at (axis cs:4.001,1.3) {};
\node[pin=-150:{$S_1$},] at (axis cs:0.1,2) {};
\end{scope}
\end{axis}
\end{tikzpicture}
\end{document}

在此处输入图片描述

我该如何改正它们？

答案1

我怀疑你喜欢实现这样的目标：

在此处输入图片描述

为此，您需要制作节点inner sep=0，或使用以下等效解决方案：

\documentclass[12pt]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\usetikzlibrary{patterns}
\pgfplotsset{compat=1.9}
\usepackage{fouriernc}
\begin{document}
    \begin{tikzpicture}
\begin{axis}
    [
    declare function={Y(\x)=\x^3 -6 * \x^2+9*\x;},
axis line style = very thick,
    axis lines = center,
    xlabel=$x$,ylabel=$y$,
        domain=-0.5:5,
        ymin=-0.5,
        ymax=4.5,
        xmin=-1.2,
        xmax=4.95,
        ytick={4},
    samples=100,xtick distance=1,ytick distance=1
,unit vector ratio*=1 1 1,
    width=11cm,
    grid=major,
    grid style={gray!30}]
\addplot [black,  thick,name path =A] {Y(x)};
       \addplot [black, mark=*,only marks,samples at={0,1,3,4}] {Y(x)};
       \node at (axis cs:-0.25, -0.25) {$O$} ;
       \addplot [ thick] coordinates {(4, 0) (4, 4) (0,4)};
\addplot[name path =C,domain=0:4] {4};
\addplot[name path =D,domain=0:4] {0};
\addplot[pattern=north east lines,  domain=0:1,samples=1000] fill between[of=A and D,soft clip={domain=3:4},];
\addplot[pattern=north east lines,  domain=0:1,samples=1000] fill between[of=A and C,soft clip={domain=0:1},];
\begin{scope}[
  every pin edge/.style={thick,latex-},
  pin distance=1.5cm
]
\node[coordinate,pin=  60:{$S_2$}] at (axis cs:4,1.3) {};
\node[coordinate,pin=-150:{$S_1$}] at (axis cs:0,2) {};
\end{scope}
\end{axis}
\end{tikzpicture}
\end{document}

笔记： 请考虑升级pgfplots到最新版本 (1.14)，以便更简单地设置坐标。例如，对于具有以下特征的节点pin：

\node[coordinate,pin=  60:{$S_2$}] at (4,1.3) {};
\node[coordinate,pin=-150:{$S_1$}] at (0,2) {};

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