自动在两个 tikz 路径之间划分文本

Question

我制作了一个自定义形状，需要在里面放一段文字。但问题是我的文字不适合装饰路径的长度。因此，我需要一种方法来自动将文字划分为两条或三条路径。

所以，这是我的形状，里面的线条是我想要放置文本的地方：

我使用以下代码生成此形状：

\begin{tikzpicture}

% shape
\draw (0,0) ++ (45:3) arc (45:135:3);
\draw (0,0) ++ (45:5) arc (45:135:5);
\draw (45:3) -- (45:5);
\draw (135:3) -- (135:5);

%lines for text
\draw (0,0) ++ (50:3.5) arc (50:130:3.5);
\draw (0,0) ++ (50:4) arc (50:130:4);
\draw (0,0) ++ (50:4.5) arc (50:130:4.5);

\end{tikzpicture}

我计划使用路径修饰将文本添加到此行：

\path[
  postaction={
    decorate,
    decoration={
      text along path,
      reverse path=true,
      text={very long long text, which don't fit the shape boundaries}
    }
  }
] (0,0) ++ (50:4.5) arc (50:130:4.5);

但如果文本很长，它就不适合提供的空间。

因此，我必须找到一种方法来计算提供的空间，然后将文本划分到几条路径之间。有什么建议吗？

Answer 1

您可以使用单一路径（包含多段）。（请注意“错误”：TikZ 以相反的顺序使用每个段......）

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.text}
\begin{document}
\begin{tikzpicture}
% shape
\draw (0,0) ++ (45:3) arc (45:135:3);
\draw (0,0) ++ (45:5) arc (45:135:5);
\draw (45:3) -- (45:5);
\draw (135:3) -- (135:5);

%lines for text
\draw[blue] (0,0) ++ (50:3.5) arc (50:130:3.5);
\draw (0,0) ++ (50:4) arc (50:130:4);
\draw (0,0) ++ (50:4.5) arc (50:130:4.5);

% text along path
\path[
postaction={
  decorate,
  decoration={
    text along path,
    reverse path=true,
    text={Very long long text, which don't fit the shape boundaries
      and so on. Very long long text... Very long text...}
  }
}
]
(0,0) ++ (50:3.5) arc (50:130:3.5)
(0,0) ++ (50:4) arc (50:130:4)
(0,0) ++ (50:4.5) arc (50:130:4.5);
\end{tikzpicture}
\end{document}

这里有一个完整的解决方案，没有reverse path选项（以避免“错误”）并且没有(0,0)（使形状适合边界框）。

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.text}
\begin{document}
\begin{tikzpicture}
  % shape
  \draw (45:3) arc (45:135:3)
  -- (135:5)  arc (135:45:5)
  -- cycle;

  % lines for text
  \draw
  (50:3.5) arc (50:130:3.5)
  (50:4) arc (50:130:4)
  (50:4.5) arc (50:130:4.5);

  % text along path
  \path[postaction={decorate,decoration={
      text along path,
      text={Very long long text, which don't fit the shape boundaries
        and so on. Very long long text... Very long text...}
    }}]
  (130:4.5) arc (130:50:4.5)
  (130:4) arc (130:50:4)
  (130:3.5) arc (130:50:3.5);
\end{tikzpicture}
\end{document}