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使用 TikZ 箭头指示两张图片之间的循环--缺少箭头

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使用 TikZ 箭头指示两张图片之间的循环--缺少箭头

我正在尝试绘制两个箭头，它们应该表示神经网络在两个状态之间循环。按照 Petri 网教程，我使用 pgfonlayer、fit 和范围将两个网络并排对齐。但是，出于某种原因，我无法让箭头出现。以下是代码

\begin{tikzpicture}[auto]
\node[excited] (middle)                  {-2.5};
\node[inhibited]   (west)  [left=of middle]   {0.5}
    edge node {-1} (middle);
\node[inhibited]   (east)  [right=of middle]  {0.5}
    edge node {-1} (middle);
\node[excited] (north) [above=of middle]  {0.5}
    edge node       {1}  (east)
    edge node[swap] {1}  (west)
    edge node       {-1} (middle);
\node[excited]   (south) [below=of middle]  {0.5}
    edge node        {-1} (middle)
    edge node        {1}  (west)
    edge node [swap] {1}  (east);
\begin{scope}[xshift=6cm]
\node[excited] (middle1)                  {-2.5};
\node[excited]   (west1)  [left=of middle1]   {0.5}
    edge node {-1} (middle1);
\node[excited]   (east1)  [right=of middle1]  {0.5}
    edge node {-1} (middle1);
\node[inhibited] (north1) [above=of middle1]  {0.5}
    edge node       {1}  (east1)
    edge node[swap] {1}  (west1)
    edge node       {-1} (middle1);
\node[inhibited]   (south1) [below=of middle1]  {0.5}
    edge node        {-1} (middle1)
    edge node        {1}  (west1)
    edge node [swap] {1}  (east1);
\end{scope}
\begin{pgfonlayer}{background}
    \node (n1) [fit=(west) (middle) (east) (south) (north)] {};
    \node (n2) [fit=(west1) (middle1) (east1) (south1) (north1)] {};
    \draw [shorten >=5mm,shorten <=5mm,bend left=45,<-]
        (north) to (north1);
    \draw [shorten >=5mm,shorten <=5mm,bend right=45,->]
        (south) to (south1);
\end{pgfonlayer}
\end{tikzpicture}

而结果，无论我是否<-在命令->中\draw。 结果

有人知道为什么会发生这种情况吗？

谢谢您的帮助。

答案1

这就是你想要的吗？你的代码不完整，这个解决方案添加了一些代码以获得你发布的输出。

在此处输入图片描述

代码

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,intersections,calc,fit}

\tikzset{
 excited/.style={circle,thick,draw=black,fill=blue!50,minimum size=6mm},
 inhibited/.style={circle,thick,draw,fill=none,minimum size=6mm},
 every fit/.append style=text badly centered   % to get rid of underfull bad box
 }

\begin{document}

\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}

\begin{tikzpicture}[auto]
\node[excited] (middle)                  {-2.5};
\node[inhibited]   (west)  [left=of middle]   {0.5}
    edge node {-1} (middle);
\node[inhibited]   (east)  [right=of middle]  {0.5}
    edge node {-1} (middle);
\node[excited] (north) [above=of middle]  {0.5}
    edge node       {1}  (east)
    edge node[swap] {1}  (west)
    edge node       {-1} (middle);
\node[excited]   (south) [below=of middle]  {0.5}
    edge node        {-1} (middle)
    edge node        {1}  (west)
    edge node [swap] {1}  (east);
\begin{scope}[xshift=6cm]
\node[excited] (middle1)                  {-2.5};
\node[excited]   (west1)  [left=of middle1]   {0.5}
    edge node {-1} (middle1);
\node[excited]   (east1)  [right=of middle1]  {0.5}
    edge node {-1} (middle1);
\node[inhibited] (north1) [above=of middle1]  {0.5}
    edge node       {1}  (east1)
    edge node[swap] {1}  (west1)
    edge node       {-1} (middle1);
\node[inhibited]   (south1) [below=of middle1]  {0.5}
    edge node        {-1} (middle1)
    edge node        {1}  (west1)
    edge node [swap] {1}  (east1);
\end{scope}
\begin{pgfonlayer}{background}
    \node (n1) [fit=(west) (middle) (east) (south) (north)] {};
    \node (n2) [fit=(west1) (middle1) (east1) (south1) (north1)] {};
    \draw [shorten >=5mm,shorten <=5mm,bend left=45,<-]
        (north) to (north1);
    \draw [shorten >=5mm,shorten <=5mm,bend right=45,->]
        (south) to (south1);
\end{pgfonlayer}
\end{tikzpicture}

\end{document}

答案2

我决定将此作为答案，因为如果其他人使用与我相同的 PDF 查看器（evince），他们可能会遇到同样的问题。

我注意到，当我在 Chrome 中查看 PDF 时，箭头会出现。在 100% 缩放时，没有箭头。如果我放大到大约 250%，它们就会出现。我不确定为什么会发生这种情况，但如果其他人遇到这个问题，好吧；这不是什么大问题。

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