救命！如何在 LaTeX 中绘制此符号？

Question

如何在 LaTeX 中绘制此符号（两条直线和一条圆弧）？真的需要帮助。谢谢！

Answer 1

像这样？这只是一个起点。

\documentclass[margin=3mm]{standalone}
\usepackage{tikz}
\usepackage{tkz-euclide}
\usetikzlibrary{calc}

\tikzset{%
startbutton/.pic = {%
\draw [very thick](0,0)--++(-90:1);
\draw [very thick](0,-2)coordinate(A)--++(-90:1);
\draw [very thick](A)--++(125:1.1)coordinate(B);
\draw [very thick]($(A)!0.45!(B)$)--++(180:0.75)coordinate(C);
\draw [very thick]($(A)!0.55!(B)$)--++(180:0.68)coordinate(D);
\tkzDrawArc[R,thick,fill,black]($(C)!0.5!(D)$, 4pt)(90,270)
}
}

\begin{document}

\begin{tikzpicture}
\pic {startbutton};
\end{tikzpicture}

\end{document}

Answer 2

该符号不在circuitikz，但如果你坚持的话，你可以构建它……或多或少。

\documentclass[border=10pt]{standalone}
\usepackage[siunitx, RPvoltages]{circuitikz}
\begin{document}
\begin{tikzpicture}[]
    \ctikzset{bipoles/cuteswitch/thickness=0.5}
    \draw (0,0) to [cosw, name=sw] ++(0,2);
    \draw[thick, double, -{Arc Barb}] (sw.mid) -- ++(-0.5,0);
\end{tikzpicture}
\end{document}

如果您想要更大的“双线”和/或（感谢@Sebastiano！）您必须做一些棘手的事情：

1. 使用剪辑（嗯，逆剪辑）正确定位双线并仅绘制有用的线；
2. 重新绘制开关以删除难看的剪辑线组合。

\documentclass[border=10pt]{standalone}
\usepackage[siunitx, RPvoltages]{circuitikz}
\begin{document}
%
% Thanks to Symbol1, Paul Gaborit etc. at
% https://tex.stackexchange.com/a/290508/38080
%
\tikzset{
    clip even odd rule/.code={\pgfseteorule}, % Credit to Andrew Stacey
    invclip/.style={
        clip,insert path=
            [clip even odd rule]{
                [reset cm](-\maxdimen,-\maxdimen)rectangle(\maxdimen,\maxdimen)
            }
    }
}
\begin{tikzpicture}[]
    \ctikzset{bipoles/cuteswitch/thickness=0.5}
    \begin{scope}
        \draw (0,0) to [cosw, name=sw, switches/scale=1.5] ++(0,2);
        % this "cuts out" from the path the triangle formed by the switch
        \begin{pgfinterruptboundingbox}
            \clip[invclip] (sw.in) -- ($(sw.in)!2!(sw.mid)$) -- (sw.out) -- cycle;
        \end{pgfinterruptboundingbox}
        \draw[thick, double, double distance=4pt, -{Arc Barb[]}] (sw.mid) ++(0.2,0) -- ++(-1.3,0);
    \end{scope}
    %
    % redraw the switch to avoid the horrible junction!
    %
    \draw (0,0) to [cosw, name=sw, switches/scale=1.5] ++(0,2);
\end{tikzpicture}

\end{document}