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如何提高 tikz 中图片的分辨率？

tag-icon • tag-icon tikz-pgf
如何提高 tikz 中图片的分辨率？

当我尝试在 tikz 中绘制抛物线时，我使用了 Geogebra。但图片的分辨率不如直接使用 tikz 时那么好。Geogebra 生成的代码是，

\documentclass[10pt]{article}
\usepackage{pgf,tikz}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
\definecolor{uuuuuu}{rgb}{0.26666666666666666,0.26666666666666666,0.26666666666666666}
\definecolor{xdxdff}{rgb}{0.49019607843137253,0.49019607843137253,1.}
\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
\draw[->,color=black] (-4.546,0.) -- (18.454,0.);
\foreach \x in {-4.,-3.,-2.,-1.,1.,2.,3.,4.,5.,6.,7.,8.,9.,10.,11.,12.,13.,14.,15.,16.,17.,18.}
\draw[shift={(\x,0)},color=black] (0pt,2pt) -- (0pt,-2pt) node[below] {\footnotesize $\x$};
\draw[->,color=black] (0.,-5.582) -- (0.,6.178);
\foreach \y in {-5.,-4.,-3.,-2.,-1.,1.,2.,3.,4.,5.,6.}
\draw[shift={(0,\y)},color=black] (2pt,0pt) -- (-2pt,0pt) node[left] {\footnotesize $\y$};
\draw[color=black] (0pt,-10pt) node[right] {\footnotesize $0$};
\clip(-4.546,-5.582) rectangle (18.454,6.178);
\draw (0.,-5.582) -- (0.,6.178);
\draw [domain=-4.546:18.454] plot(\x,{(-0.-0.*\x)/2.72});
\draw [samples=50,rotate around={-90.:(0.72,0.)},xshift=0.72cm,yshift=0.cm,domain=-11.519999999999998:11.519999999999998)] plot (\x,{(\x)^2/2/1.4399999999999997});
\draw (1.44,-5.582) -- (1.44,6.178);
\begin{scriptsize}
\draw [fill=xdxdff] (0.,0.) circle (1.5pt);
\draw[color=xdxdff] (0.134,0.278) node {$A$};
\draw[color=black] (0.214,6.038) node {$a$};
\draw[color=black] (-4.386,0.338) node {$b$};
\draw [fill=xdxdff] (1.44,0.) circle (1.5pt);
\draw[color=xdxdff] (1.574,0.278) node {$B$};
\draw [fill=uuuuuu] (1.44,1.44) circle (1.5pt);
\draw[color=uuuuuu] (1.574,1.718) node {$C$};
\draw [fill=uuuuuu] (0.72,0.) circle (1.5pt);
\draw[color=uuuuuu] (0.854,0.278) node {$D$};
\draw [fill=uuuuuu] (1.44,-1.44) circle (1.5pt);
\draw[color=uuuuuu] (1.574,-1.162) node {$E$};
\end{scriptsize}
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案1

我猜你指的是抛物线的分辨率。那么，只需替换samples=50为samples=501或类似值即可。

答案2

为了得到 pgfplots 建议的答案其中一条评论对于你的问题，我编写了以下代码。我必须感谢杰克感谢他的善意建议他的回答相关问题我在这里问过。

在此处输入图片描述

%pdfLaTeX
\documentclass[border=1mm]{standalone}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}

\begin{axis}
    [
    axis lines = center,
    grid=both,
    minor tick num=1,
    xlabel=$x$,ylabel=$y$,
    samples=50,
    domain=-3:3,
    ]

    \addplot [] (x^2+0.8, x);
    \addplot [dashed] (1.5,x);

    \addplot [red, mark = o] coordinates {( 1.5, 0)};
    \addplot [red, mark = o] coordinates {( 1.5, +0.837)};
    \addplot [red, mark = o] coordinates {( 1.5, -0.837)};
    \addplot [red, mark = o] coordinates {( 0, 0)};

\end{axis}

\end{tikzpicture}
\end{document}

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