我想修改这个笛卡尔平面，通过绘制垂直线 x = -2 并添加 0 和图中所示的线条，但我无法修复它们。您能帮帮我吗？
\documentclass[margin=20pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplots} %%%%%
\usepackage{lxfonts}
\begin{document}
\begin{tikzpicture}[
dot/.style={
circle,fill,draw,minimum size=2mm,inner sep=0
}]
\begin{axis}[
axis equal image,
max space between ticks=20, % This is one way of getting a tick for every integer
ticklabel style={font=\scriptsize},
axis lines = middle,
xmin=-5.5, xmax=5.5, % The range over which the x axis is drawn
ymin=-4.5, ymax=6.0, % The range over which the y axis is drawn
domain=-6:5.5, % The range over which the function is evaluated
grid=both,
xlabel=$x$, ylabel=$y$
]
\addplot [very thick, blue, smooth] {-(0)*x+1};
\coordinate [label=above right:$0$] t (0.0,0.0);
\draw [color=black,fill=black,fill opacity=1.0] (a) circle (0.15cm);
\coordinate [label=above right:$y=1$] at (-4.0,2.0);
\coordinate [label=above right:$x=-2$] at (-4.0,-3.0);
\end{axis}
\end{tikzpicture}
\end{document}
答案1
我添加了一个建议（并修复了一些小错误）。
\documentclass[margin=20pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usepackage{pgfplots} %%%%%
\pgfplotsset{compat=1.16}
%\usepackage{lxfonts}
\begin{document}
\begin{tikzpicture}[
dot/.style={
circle,fill,draw,minimum size=2mm,inner sep=0
}]
\begin{axis}[
axis equal image,
max space between ticks=20, % This is one way of getting a tick for every integer
ticklabel style={font=\scriptsize},
axis lines = middle,
xmin=-5.5, xmax=5.5, % The range over which the x axis is drawn
ymin=-4.5, ymax=6.0, % The range over which the y axis is drawn
domain=-6:5.5, % The range over which the function is evaluated
grid=both,
xlabel=$x$, ylabel=$y$
]
\addplot [very thick, blue] {-(0)*x+1} node[above left,font=\small]{$y=1$};
\addplot [very thick, red,domain=6:-3.5] (-2,{x}) node[below,font=\small]{$x=-2$};
\node[dot,label={[font=\small]above right:$0$}] (a) at (0,0){};
\end{axis}
\end{tikzpicture}
\end{document}
