LaTex コード〔円錐曲線〕

\begin{tikzpicture}
\drawblack ellipse (2 and 0.5);
\drawblack ellipse (2 and 0.5);
\draw — (-1.05,-2.88);
\draw — (-1.05,2.88);
\draw — (1.05,-2.88);
\draw — (1.05,2.88);

\drawblue, ultra thick ellipse (0.4 and 0.1);
\draw — (-2.2,-0.8);
\draw — (-3.4,-0.4);
\draw — (-2.6,-0.4);
\draw — (-3.3,-0.4);
\draw — (-2.7,-0.4);
\drawdashed — (-3.3,-0.4);
\node[] at (-2,-0.4) {円};

\drawrotate around={20:(-3.26,-1.72)}, blue, ultra thick ellipse (1.2 and 0.2);
\draw — (-1.5,-1.5);
\draw — (-4.4,-1.85);
\draw — (-4.1,-1.7);
\draw — (-2,-0.88);
\draw — (-2.3,-1);
\drawdashed — (-4.1,-1.7);
\node[] at (-1.2,-1.7) {楕円};

\drawblue, ultra thick .. controls (-4.5,1.2) and (-4.2,1.5) .. (-3,2.5);
\drawdotted, blue, thick — (-3,2.5);
\draw — (-4,0.5);
\draw — (-4.1,3.8) coordinate (A);
\draw — (-4.9,2) coordinate (B);
\drawdashed — (B);
\draw — (-4.28,3.4);
\draw — (-4.7,2.45);
\node[] at (-2,2.2) {放物線};

\draw coordinate (A) — (4.5,2.8) coordinate (B);
\drawdashed — (3.1,-2.5) coordinate (C);
\draw — (3.2,3.7) coordinate (D);
\drawdashed — (D);
\drawblue, ultra thick coordinate (E) .. controls (4,-0.9) and (3.8,-0.6) .. (3.3,-2.5) coordinate (F);
\drawdotted, blue, thick — (F);
\drawblue, ultra thick coordinate (G) .. controls (4,1) and (3.8,0.7) .. (3.3,3.5) coordinate (H);
\drawdotted, blue, thick — (H);
\draw — (4.1,-3.43);
\node[] at (2.5,2.2) {双曲線};

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\pgfpathmoveto{\pgfpoint{-5cm}{-3cm}}
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\pgfstroke

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\pgfstroke

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\pgfstroke

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\pgfstroke
\end{tikzpicture}