调整箭头的位置

Question

可以看出，箭头的定位不正确。我可以通过指示 7.95 而不是 8 来改进。有没有更可靠的方法？

   \documentclass[border=10pt]{standalone}
   \usepackage{pgfplots}
   \pgfplotsset{compat=newest}
   \usetikzlibrary{arrows,decorations.markings}
   \usetikzlibrary{arrows.meta}
   \begin{document}
   \begin{tikzpicture}
      [extended line/.style={shorten >=-#1,shorten <=-#1},
       /pgf/declare function={f(\x)=6*\x;},
       /pgf/declare function={g(\x)=4*\x + 16;}]  
   \begin{axis}[
     restrict x to domain=-1:14, xmax=14, xmin=-1,
     restrict y to domain=-10:100, ymax=100, ymin=-10,
     x=1cm,
     y=0.1cm,
     axis x line=middle,
     axis y line=middle,
     major tick style=black,
     axis line style = very thick,
     tick align=outside,
     tickwidth=0.12cm,
     tick style=thick,
     grid=both,
     xtick={0,1,...,13},
     ytick={0,10,...,90},
     extra x ticks={-1,14},
     extra x tick label={\null},
     extra y ticks={-10,100},
     extra y tick label={\null},
     extra tick style={tick style={draw=none}},
     xlabel=$x$,ylabel=$y$,
     every axis x label/.style={
     at={(ticklabel* cs:1.01)},anchor=west},
     every axis y label/.style={
     at={(ticklabel* cs:1.01)}, anchor=south},
     x tick label style={
     /pgf/number format/1000 sep={},
     },
     y tick label style={
     /pgf/number format/1000 sep={},
     }, 
     samples=2000,
     axis on top=false,
     >=stealth]
     \addplot [very thick,domain=0:14] {f(x)};
     \addplot [very thick,domain=0:14] {g(x)};
     \addplot [very thick,domain=8:14,red] {f(x)};

     \draw[red,dashed,thick](8,0) -- (8,{f(8)}) -- (0,{f(8)});
     \draw[arrows={Bracket[reversed,line join=miter]->},red,very thick]
     (8,0) -- (14,0); 
     \node[below left=2pt] at (0,0) {0};
    \end{axis}                  
    \end{tikzpicture}
    \end{document}

Answer 1

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{decorations.markings}
\begin{document}
\begin{tikzpicture}[>=stealth]
\draw[help lines] grid (4,2);
\draw[arrows={Bracket[reversed,line join=miter]->},red,very thick] (1,2) -- (3,2); % initial example
\draw[postaction={decorate},red,very thick, decoration={
markings,% switch on markings
mark=at position -0.001cm with {\arrow[red,very thick]{>}},
mark=at position 0pt with {\arrow[red,very thick]{Bracket[]}}
}] (1,1) -- (3,1); % all purpose solution
\draw[postaction={decorate},red,very thick,decoration={
markings,% switch on markings
mark=at position -0.001cm with {\arrow[red,very thick]{>}},
mark=at position 1.1pt with {\arrow[red,very thick]{Bracket[]}}
},shorten >=1.2pt] (1,0) -- (3,0); % better looking but not self-adapting to different marking sizes
\end{tikzpicture}
\end{document}

两种解决方案，均不完美：

• 在第二行，括号现在有点太靠左了，不符合我的口味，并且段的方角现在稍微突出了尖端。

• 第三行，看起来不错，但如果你改变装饰的尺寸，它不会自适应