我正在制作一个显示笛卡尔平面上绘制点的图像。我使用的是axis来自的环境pgfplots。它可以很好地绘制点，但我似乎无法弄清楚将箭头放在哪里以显示运动。我可以尝试计算位置，但似乎应该有更好的方法。
工作部分是：
\usepackage{tikz,pgfplots} %for graphics
\pgfplotsset{compat = newest} %to run newest version
\usetikzlibrary{calc,tikzmark,arrows,arrows.meta,positioning}
\begin{document}
\begin{tikzpicture}
\begin{axis}[xmin=-5, xmax=5, ymin=-5, ymax=5,
axis lines=middle, myaxis, xtick = {-4,-3,-2,-1,0,1,2,3,4}, ytick = {-4,-3,-2,-1,0,1,2,3,4},
xlabel = \(x\), ylabel = \(y\)]
\addplot+[only marks] coordinates {(0,1) (-2,4) (1,-3)};
\end{axis}
\end{tikzpicture}
\end{document}
我试过：
\begin{tikzpicture}
\begin{axis}[xmin=-5, xmax=5, ymin=-5, ymax=5,
axis lines=middle, myaxis, xtick = {-4,-3,-2,-1,0,1,2,3,4}, ytick = {-4,-3,-2,-1,0,1,2,3,4},
xlabel = \(x\), ylabel = \(y\)]
\addplot+[only marks] coordinates {(0,1) (-2,4) (1,-3)};
\end{axis}
\draw[green,-latex, very thick] (0,0) -- (0,1);
\draw[blue,latex-, very thick] (0,0) -- (-2,0);
\draw[blue,-latex, very thick] (-2,0) -- (-2,4);
\draw[gray,-latex, very thick] (0,0) -- (1,0);
\draw[gray,-latex, very thick] (1,0) -- (1,-3);
\end{tikzpicture}
但这却惨遭失败。
答案1
使用axis坐标系来引用图表中的点。为此，\draw需要在axis环境内使用该操作。
现在，您可以使用(axis cs: <x>, <y>)参考点 (X，是) 在您的图表中。
\documentclass[tikz]{standalone}
\usepackage{pgfplots} %for graphics
\pgfplotsset{compat = newest} %to run newest version
\usetikzlibrary{arrows}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xmin=-5, xmax=5, ymin=-5, ymax=5,
axis lines=middle,
%myaxis, % don't know this
xtick = {-4,-3,-2,-1,0,1,2,3,4},
ytick = {-4,-3,-2,-1,0,1,2,3,4},
xlabel = \(x\),
ylabel = \(y\)
]
\addplot+[only marks] coordinates {(0,1) (-2,4) (1,-3)};
\draw[green,-latex, very thick](axis cs: 0,0) -- (axis cs: 0, 1);
\draw[blue,latex-, very thick] (axis cs: 0,0) -- (axis cs:-2, 0);
\draw[blue,-latex, very thick] (axis cs:-2,0) -- (axis cs:-2, 4);
\draw[gray,-latex, very thick] (axis cs: 0,0) -- (axis cs: 1, 0);
\draw[gray,-latex, very thick] (axis cs: 1,0) -- (axis cs: 1,-3);
\end{axis}
\end{tikzpicture}
\end{document}
