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画线到正确的圆圈

tag-icon • tag-icon tikz-pgf
画线到正确的圆圈

我有以下代码

\def\aes{in*0.75}%%
\begin{tikzpicture}[scale=0.34mm]
  \coordinate (A) at (0,0);
  \coordinate (B) at ($(A)+(30:4\aes)$);
  \coordinate (C) at ($(B)+(-90:2.5\aes)$);

  \draw[line width=2pt,gray!60,postaction={draw,black,dashed,line width=1.4pt}] (A) circle (\aeRadiusA);

  \draw[red] (B) circle (\aeRadiusB);
  \draw[blue] (C) circle (\aeRadiusC);

  \coordinate (A1a) at ($(A)+(-20:\aeRadiusA*0.75)$);
  \coordinate (C1a) at ($(C)+(90+20:\aeRadiusC*0.75)$);
  \coordinate (A1b) at ($(A1a)+(3pt,2pt)$);
  \coordinate (C1b) at ($(C1a)+(0pt,-2pt)$);

  \coordinate (A2a) at ($(A)+(30:\aeRadiusA*0.65)$);
  \coordinate (B2a) at ($(B)+(140:\aeRadiusB*0.65)$);
  \coordinate (A2b) at ($(A2a)+(15pt,4pt)$);
  \coordinate (B2b) at ($(B2a)+(-4pt,3pt)$);

 \begin{scope}[rotate=280]
    \fill[red!20] (B2a) circle (4pt);
    \foreach \x in {-3,...,5}{
      \draw[blue,shorten >= rand*15] (B2a) -- (rand*\x:3);
      }      
      \fill[blue] (B2a) circle(2pt);
    \end{scope}

  \node[anchor=north west] at (A) {9-graph};
  \node                    at (B) {4-graph};
  \node                    at (C) {5-graph};
\end{tikzpicture}

它从圆 B 画出一些线到圆 A 中的点。我不确定如何才能将这些线画到圆 C 内的点。有人知道我该怎么做吗？

根据要求，以下图片是我想要的在此处输入图片描述

并实现

\coordinate (A1a) at ($(A)+(-20:\aeRadiusA*0.75)$);
  \coordinate (C1a) at ($(C)+(90+20:\aeRadiusC*0.75)$);
  \coordinate (A1b) at ($(A1a)+(3pt,2pt)$);
  \coordinate (C1b) at ($(C1a)+(0pt,-2pt)$);
  \coordinate (C1c) at ($(C1b)+(5pt,-2pt)$);
  \coordinate (C1d) at ($(C1c)+(10pt,8pt)$); 
  \coordinate (C1e) at ($(C1d)+(10pt,8pt)$);  
  \coordinate (C1f) at ($(C1e)+(-5pt,-2pt)$);  
  \coordinate (C1g) at ($(C1e)+(-45pt,-20pt)$);   


  \coordinate (A2a) at ($(A)+(30:\aeRadiusA*0.65)$);
  \coordinate (B2a) at ($(B)+(140:\aeRadiusB*0.65)$);
  \coordinate (A2b) at ($(A2a)+(15pt,4pt)$);
  \coordinate (B2b) at ($(B2a)+(-4pt,3pt)$);

 \begin{scope}[rotate=100]
    \fill[red!20] (B2a) circle (4pt);

    \draw[blue] (B2a) -- (C1a);
    \draw[red] (B2a)  -- (C1b);
    \draw[blue] (B2a) -- (C1c);
    \draw[red] (B2a)  -- (C1d);
    \draw[blue] (B2a) -- (C1e);
    \draw[red] (B2a)  -- (C1f);
    \draw[blue] (B2a)  -- (C1g);
    \fill[red] (B2a) circle(2pt);
 \end{scope}

正如您所看到的，这些行是硬编码的，不是我想要的。

答案1

如果只是用两种交替的颜色从一个固定点到多个其他点绘制线条，则可以执行以下操作：

\documentclass[tikz, border=5mm]{standalone}

\begin{document}
  \begin{tikzpicture}
    \foreach [count=\i] \x in {a,...,g} {
        % use a mod() for swapping between red and blue
        \pgfmathparse{mod(\i, 2) ? "red" : "blue"}
        % draw from fixed point to point in foreach with color determined by mod()
        \draw [\pgfmathresult] (B2a) -- (C1\x);
    }
  \end{tikzpicture}
\end{document}

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