自動在兩個 tikz 路徑之間劃分文本

Question

我製作了一個自訂形狀，我需要在其中添加文字。但問題是我的文字不適合裝飾路徑的長度。因此，我需要一種方法來自動在兩個或三個路徑之間劃分文字。

所以，這是我的形狀，裡面的線條是我想放置文字的地方：

我使用以下程式碼產生此形狀：

\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}

我計劃使用路徑裝飾將文字新增至此行：

\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);

但如果文字很長，則無法容納所提供的空間。

所以我必須找到一種方法來計算提供的空間，然後將文字劃分在幾個路徑之間。有什麼建議麼？

Answer 1

您可以使用單一路徑（具有多個段）。（注意“bug”：TikZ 以相反的順序使用每個段落......）

\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}

這是一個完整的解決方案，沒有reverse path選項（以避免“錯誤”）和沒有(0,0)（以適應邊界框中的形狀）。

\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}