TikZ 中沿弯曲箭头的文本

Question

我想在 TikZ 中沿着弯曲的箭头写一些文字。当我不弯曲箭头时，一切都按预期工作，但是当我添加它时，文本的定位变得荒谬。这是一个 MWE：

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\begin{document}

\begin{frame}{}
  \tikzstyle{leaf}=[shape=circle,draw=black,fill=green!20,minimum size=0.01cm]
  \tikzstyle{pool}=[shape=rectangle,draw=black,fill=blue!20,minimum width=4cm,minimum height=1cm]
  \begin{figure}[t]
    \begin{tikzpicture}[overlay,remember picture]
      \node[pool] (biomass_pool) at (0,-2) {Pool};
      \node[leaf] (leaf_1) at (-5.5,1.5) {$x_1$};
      \draw [{Latex[length=1.5mm]}-] (leaf_1) -- (biomass_pool) node [pos=.5, above, sloped] (TextNode1) {$q_1$};
      \draw [-{Latex[length=1.5mm]},dotted] (leaf_1) to [bend left=5]  (biomass_pool) node [pos=.5, below, sloped] (TextNode2) {$d_1$};
    \end{tikzpicture}
  \end{figure}
\end{frame}

\end{document}

输出：

q_1位置正确，因为箭头没有弯曲，但d_1箭头没有弯曲。有办法解决这个问题吗？或者有什么解决方案可以很好地显示Pool和之间的双重交换x_1？

非常感谢。

Answer 1

我会做这样的事情：

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\begin{document}

    \begin{frame}{}
    \tikzstyle{leaf}=[shape=circle,draw=black,fill=green!20,minimum size=0.01cm]
    \tikzstyle{pool}=[shape=rectangle,draw=black,fill=blue!20,minimum width=4cm,minimum height=1cm]
    \begin{figure}[t]
        \begin{tikzpicture}[overlay,remember picture]
        \node[pool] (biomass_pool) at (0,-2) {Pool};
        \node[leaf] (leaf_1) at (-5.5,1.5) {$x_1$};
        \draw [{Latex[length=1.5mm]}-] (leaf_1) to [bend right=30] node [above, sloped] (TextNode1) {$q_1$} (biomass_pool);
        \draw [-{Latex[length=1.5mm]},dotted] (leaf_1) to [bend left=30]  node [above, sloped]  (TextNode2) {$d_1$} (biomass_pool);
        \end{tikzpicture}
    \end{figure}
\end{frame}

\end{document}

Answer 2

当使用 时to，node必须放在 之后to，而不是 下一个坐标之后，即(a) to node{foo} (b)而不是(a) to (b) node[midway]{foo};。

\tikzstyle顺便说一句，我认为 已被弃用。它仍然有效，但推荐的方法是\tikzset{style A/.style={...}, style B/.style={...}}。

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\begin{document}

\begin{frame}{}
  \tikzset{
      leaf/.style={shape=circle,draw=black,fill=green!20,minimum size=0.01cm},
      pool/.style={shape=rectangle,draw=black,fill=blue!20,minimum width=4cm,minimum height=1cm}
  }
  \begin{figure}[t]
    \begin{tikzpicture}[overlay,remember picture]
      \node[pool] (biomass_pool) at (0,-2) {Pool};
      \node[leaf] (leaf_1) at (-5.5,1.5) {$x_1$};
      \draw [{Latex[length=1.5mm]}-] (leaf_1) -- (biomass_pool) node [pos=.5, above, sloped] (TextNode1) {$q_1$};
      \draw [-{Latex[length=1.5mm]},dotted] (leaf_1) to[bend left=5] node [below, sloped] (TextNode2) {$d_1$} (biomass_pool);
    \end{tikzpicture}
  \end{figure}
\end{frame}

\end{document}

Answer 3

• 您真的需要为边标签命名节点吗？
• 有必要tikzpicture有选择overlay,remember picture吗？
• 图像是否必须在figure环境中（我看不到标题）？

如果答案是否定的，那么我宁愿使用以下解决方案：

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{arrows.meta, quotes}

\begin{document}

\begin{frame}
\frametitle{My image}
\centering
    \begin{tikzpicture}[%overlay,remember picture, % do you really need this?
%
    auto,
    leaf/.style={circle,draw,fill=green!20,minimum size=1mm},
    pool/.style={draw,fill=blue!20,minimum width=4cm,minimum height=1cm},
     Arr/.style={-{Latex[length=1.5mm]}},
                        ]
    \node[pool] (biomass_pool)  at (0,-2) {Pool};
    \node[leaf] (leaf_1)        at (-5.5,1.5) {$x_1$};
    \draw[Arr] (biomass_pool)   to [bend left=30,"$q_1$"] (leaf_1);
    \draw[Arr,dotted] (leaf_1)  to [bend left=30,"$d_1$"]   (biomass_pool);
    \end{tikzpicture}
\end{frame}

\end{document}