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修改现有的 CircuiTikZ 符号

tag-icon • tag-icon circuitikz
修改现有的 CircuiTikZ 符号

我想在电路中使用可变电容二极管。但是，由于我的符号相当小，可变电容线太靠近会产生问题，从而产生难看的结果：

在此处输入图片描述

我无法找到两条线的距离的配置选项，因此我将无容二极管的代码复制到我的文档的前言中。

\makeatletter
\pgfcircdeclarebipole{
  \anchor{strokepathstart}{
      \northeast
        \pgf@y=0cm
        \pgf@x=.8\pgf@x
    }
  \anchor{strokepathend}{
    \northeast
    \pgf@y=0cm
  }
  }{\ctikzvalof{bipoles/varcap/height}}{emptyvarcap}{\ctikzvalof{bipoles/varcap/height}}{\ctikzvalof{bipoles/varcap/width}}{

  \pgfsetlinewidth{\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgfstartlinewidth}
  \pgfscope
    \pgftransformxshift{\pgf@circ@res@left}
    \pgfpathmoveto{\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@left}{0pt}}
    \pgfpathlineto{\pgfpoint{0pt}{\pgf@circ@res@up}}
    \pgfpathlineto{\pgfpoint{0pt}{\pgf@circ@res@down}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@left}{0pt}}
    \pgfusepath{draw}

    \pgfpathmoveto{\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@left}{\pgf@circ@res@down}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@left}{\pgf@circ@res@up}}
    \pgfpathmoveto{\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@left}{\pgf@circ@res@down}}  %%%% MODIFIED HERE
    \pgfpathlineto{\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@left}{\pgf@circ@res@up}}    %%%% AND HERE
    \pgfusepath{draw}

  \endpgfscope
}
\makeatother

我修改了标有 %%%% 的两行，并插入了因子 1.3，然后得出以下结果：

在此处输入图片描述

在我看来，这看起来好多了。但是，我如何才能更改连接线开始的锚点？正如我们所见，下一条线有一个小“尾巴”。

答案1

回答您的问题：在这种情况下，正确的锚点是 strokpathstart/strokpathend，因为您使用的是描边二极管符号。

尽管如此，这种情况不应该发生，我将根据上述答案调整 circuitikz 上的符号。

顺便说一句，如果您想使用描边符号，您应该使用此代码（更改了 strokepathstart 锚点）

\pgfcircdeclarebipole{
\anchor{strokepathstart}{
        \northeast
            \pgf@y=0cm
            \advance\pgf@x by -\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgflinewidth
            \advance\pgf@x by -\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgflinewidth
}
\anchor{strokepathend}{
    \northeast
    \pgf@y=0cm
}   
}{\ctikzvalof{bipoles/varcap/height}}{emptyvarcap}{\ctikzvalof{bipoles/varcap/height}}{\ctikzvalof{bipoles/varcap/width}}{
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgfstartlinewidth
  \pgfsetlinewidth{\pgf@circ@res@temp}
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{0pt}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{0pt}}
  \pgfusepath{draw}
 %
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{\pgf@circ@res@up}}
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}
  \pgfusepath{draw}
}

谨致问候，Stefan

答案2

双极子的连接点始终位于\pgf@circ@res@left和\pgf@circ@res@right，因此您需要将所有东西都安装在这些限制之内。

后来我想到，通过使间隙的大小与线条的粗细相同，两条线就永远不会重叠。

\documentclass[border=2mm]{standalone} 
\usepackage{circuitikz}

\makeatletter
\pgfcircdeclarebipole{
  \anchor{strokepathstart}{
      \northeast
        \pgf@y=0cm
        \pgf@x=.8\pgf@x
    }
  \anchor{strokepathend}{
    \northeast
    \pgf@y=0cm
  }
  }{\ctikzvalof{bipoles/varcap/height}}{emptyvarcap}{\ctikzvalof{bipoles/varcap/height}}{\ctikzvalof{bipoles/varcap/width}}{

  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/bipoles/thickness}\pgfstartlinewidth
  \pgfsetlinewidth{\pgf@circ@res@temp}
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{0pt}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{0pt}}
  \pgfusepath{draw}
%
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@right-2\pgf@circ@res@temp}{\pgf@circ@res@up}}
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}
  \pgfusepath{draw}
}
\makeatother

\begin{document}
\begin{circuitikz}
\draw (0,0) to[VCo] (2,0) to[VCo] (2,2) to[VCo] (0,0);
\begin{scope}[xshift=3cm,scale=0.5,circuitikz/bipoles/length=.5cm]
\draw (0,0) to[VCo] (2,0) to[VCo] (2,2) to[VCo] (0,0);
\end{scope}
\begin{scope}[xshift=4.5cm,very thin,scale=0.5,circuitikz/bipoles/length=.5cm]
\draw (0,0) to[VCo] (2,0) to[VCo] (2,2) to[VCo] (0,0);
\end{scope}
\end{circuitikz}
\end{document}

演示

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