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```
\documentclass{standalone}
\usepackage{tikz,amsmath,osno}
\usetikzlibrary{patterns}
\begin{document}
\begin{tikzpicture}
\draw -latex,thick—(4,0) node [below] {\large $x$};
\draw -latex,thick—(0,5) node [left] (0,5) {\large $y$};
\draw [smooth,very thick, domain=-2.5:2.5] plot (\x, {0.5\x\x});
\draw [smooth,very thick, domain=-5:1] plot (\x, {0.5*(\x+2)^2-2});
\foreach \x in{-5,-4,-3,-2,-1,0,1,2,3 }{ \draw (\x,0.15)—(\x,0);
}
\foreach \y in{-4,-3,-2,-1,0,1,2,3,4}{ \draw (0.15,\y)—(0,\y);
}
\draw [thick,densely dashed] (-2,4)—(-2,-3);
\node [below right] at (0,0) {\large $O$};
\end{tikzpicture}
\end{document}
```
3 回答
1
就不能把代码放到代码块里么？
```tex
\documentclass{standalone}
\usepackage{tikz,amsmath}
\usetikzlibrary{patterns}
\begin{document}
\begin{tikzpicture}
\draw [-latex,thick](-5.5,0)--(4,0) node [below] {\large $x$};
\draw [-latex,thick](0,-4.5)--(0,5) node [left] {\large $y$};
\draw [smooth,very thick, domain=-2.5:2.5] plot (\x, {0.5*\x*\x});
\draw [smooth,very thick, domain=-5:1] plot (\x, {0.5*(\x+2)^2-2});
\foreach \x in{-5,-4,-3,-2,-1,1,2,3 }{ \draw (\x,0.15)--(\x,0)node[below]{$\x$};
}
\foreach \y in{-4,-3,-2,-1,1,2,3,4}{ \draw (0.15,\y)--(0,\y)node[left]{$\y$};
}
\draw [thick,densely dashed] (-2,4)--(-2,-3);
\node [below right] at (0,0) {\large $O$};
\fill[gray,opacity=0.6](0,0) parabola (-2,2)--(-2,-2) parabola(0,0);
\node at (-2,2) [left]{$Q$};
\node at (-2,-2)[below left]{$P$};
\end{tikzpicture}
\end{document}
```
-
桔子大哥，我就太佩服了。 – chaisu 2019-12-04 22:15 回复
0
参考[如何用tikz填充不规则图形的颜色](https://wenda.latexstudio.net/q-1341.html "如何用tikz填充不规则图形的颜色")
0
看看这个贴子里给出的链接：[https://wenda.latexstudio.net/article-5035.html](https://wenda.latexstudio.net/article-5035.html "https://wenda.latexstudio.net/article-5035.html")
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