关注者
0
被浏览
1k
好久没画图了，手生，将就一下吧
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{intersections,arrows.meta}
\begin{document}
\begin{tikzpicture}[>=Stealth]
\draw[->] (-3,0) -- (3,0);
\foreach \x in{20,30,40}
\draw[->,name path=p\x] (0,0) -- (\x:3);
\draw[name path=p50,domain=-2:2,smooth] plot (\x,0.5*\x*\x);
\draw[name intersections={of=p20 and p50,name=i,total=\t},fill=white]
{(i-2) circle (1pt)};
\draw[name intersections={of=p30 and p50,name=i,total=\t},fill=white]
{(i-2) circle (1pt)};
\draw[name intersections={of=p40 and p50,name=i,total=\t},fill=white]
{(i-2) circle (1pt)};
\draw[name intersections={of=p20 and p50,name=i,total=\t},fill=white]
{(i-1) circle (1pt)};
\end{tikzpicture}
\end{document}
手机
浏览
