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Just as the title, how to draw a figure eight curve using tikz ? Or more general, how to use tikz to draw a parametric curve with the given parametrization ? I knew how to draw basic things by tikz like straight lines, vector, the curves using \draw .. controls or \draw to[in=, out=], and the parametric curves is something new to me. Thanks

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    I do not really understand, what you are asking (maybe because my English is not good enough). What do you mean with “figure eight curve”? An octagon (eight-sided figure)? Or something like this but with 8 instead of 9 points? Can you show, what you've tried?
    – cabohah
    Commented Mar 28 at 8:58
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    I think you should spend some time here, which you can use to express x(t) and y(t) by parameter t etc. ... tikz.dev/dv
    – MS-SPO
    Commented Mar 28 at 8:59
  • @cabohah a figure-eight curve is a curve with the shape of the number eight, in math we usually call it "figure-eight curve", just like in the answer below.
    – PermQi
    Commented Mar 28 at 9:56
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    You might Google Lissajous figure, also called Bowditch Curve. Commented Mar 29 at 1:59

1 Answer 1

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Here's something:

\documentclass{article}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
    % Figure Eight Curve
    \draw[domain   = 0:360,
          samples  = 200,
          variable = \t,
          smooth, blue, thick]
    plot ({2*cos(\t)},{2*sin(2*\t)});
\end{tikzpicture}

\end{document}

Which generates this:

Test

Hope this is useful. Next time, please consider trying something out and showing where you failed rather than a bare-bones question.

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  • Thank you really much. this really helpful to me.
    – PermQi
    Commented Mar 28 at 10:04

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