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tikz 箭头包定义箭头底部（起点）的位置

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tikz 箭头包定义箭头底部（起点）的位置

我在尝试让 tikz 根据箭头底部而不是中心来定位箭头时遇到了麻烦。似乎中心是默认的。我该如何覆盖该默认设置？

以下是 MWE：\

documentclass{article}
\usepackage{pgfplots}
\usepackage{tikz}
\usetikzlibrary[shapes.arrows]
\pgfplotsset{compat=newest}
\usepgfplotslibrary{fillbetween}

\begin{document}

\begin{figure}
  \centering
  \begin{tikzpicture}[scale=1.7, every node/.style={single arrow, draw=none}]
    \begin{axis}[ xmin=-1.0,xmax=1.0,
        ymin=-0.2,ymax=6.7,
      ]
      \plot[name path=A, thick,samples=100,domain=-1:1] {4- sin(180*x)};
      \plot[name path=B,thick,samples=100,domain=-1:1] {1+x^2};
      \addplot[fill=gray,opacity=0.4] fill between [of=A and B];
      \draw[dotted] (-1,0)--(-1,2);
      \draw[dotted] (1,0)--(1,2);
      \node [fill=green, single arrow head indent=1ex,minimum height=5cm,
      minimum width=2cm,rotate=90] at (-0.5,1.25) {};
      \node[] at (-0.5,1.25) {Start Here!};
      
    \end{axis}
  \end{tikzpicture}
  \caption{I need the arrwo to start in the bottom curve}
  \label{subfig1}
\end{figure}

\end{document}

这里是图片： 请将箭头向上移动

答案1

添加anchor=west到节点选项。您需要的是west锚点，而不是south，因为节点是旋转的，并且节点的锚点也会随之旋转。

如果你的目的是在两个函数之间画一个粗箭头，那么最好使用类似

  \draw [line width=5mm,
         -{Stealth[width=15mm, length=10mm, inset=1mm]},
         blue]
         (-0.5, {G(-0.5)}) -- (-0.5, {F(-0.5)});

我认为，其中F和G是用定义的函数declare function。（不过您不必这样做，您可以直接在坐标中编写函数表达式，用替换x。-0.5）Stealth箭头来自arrows.meta库，因此必须加载。

在此处输入图片描述

\documentclass{article}
\usepackage{pgfplots} % loads tikz, you don't have to do it explicitly
\usetikzlibrary{shapes.arrows, arrows.meta}
\pgfplotsset{compat=newest}
\usepgfplotslibrary{fillbetween}

\begin{document}

\begin{figure}
  \centering
  \begin{tikzpicture}[
     every node/.style={single arrow, draw=none},
     declare function={
       F(\x) = 4- sin(180*\x);
       G(\x) = 1+\x*\x;
       }
     ]
    \begin{axis}[
        xmin=-1.0,xmax=1.0,
        ymin=-0.2,ymax=6.7,
        width=10cm,
        samples=100,
        domain=-1:1
      ]
      \addplot[name path=A, thick] {F(x)};
      \addplot[name path=B,thick] {G(x)};
      \addplot[fill=gray,opacity=0.4] fill between [of=A and B];
      \draw[dotted] (-1,0)--(-1,2);
      \draw[dotted] (1,0)--(1,2);
      \node [fill=green, single arrow head indent=1ex,minimum height=5cm,
      minimum width=2cm,rotate=90, anchor=west] at (-0.5,1.25) {};
      
      \draw [line width=5mm,
             -{Stealth[width=15mm, length=10mm, inset=1mm]},
             blue]
             (-0.5, {G(-0.5)}) -- (-0.5, {F(-0.5)});
      
    \end{axis}
  \end{tikzpicture}
  \caption{I need the arrwo to start in the bottom curve}
  \label{subfig1}
\end{figure}

\end{document}

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