TikZでパスグラフを描くのに苦労しています

Question

TikZ を学ぶ初心者として、次のことを試しました。

\documentclass[border=0.2cm]{standalone}
\usepackage{tikz}
\usetikzlibrary{automata, positioning}

\begin{document}
\begin{tikzpicture} [draw=black,
node distance = 3cm, 
on grid, 
auto,
every loop/.style={stealth-}]

\node (e1) [state] {$E$};
\node (c1) [state, right = of e1] {$C$};
\node (a1) [state, right = of c1] {$A$};
\node (t1) [state, below = of c1] {$T1$};
\node (a2) [state, right = of a1] {$A$};
\node (c2) [state, right = of a2] {$C$};
\node (e2) [state, right = of c2] {$E$};    
\node (t2) [state, below = of c2] {$T2$};

% Arrows
\path [-stealth, thick]
(e1) edge node {$e^2$}   (t1)
(c1) edge node {$c^2$}   (t1)
(a1) edge node {$h^2$}   (t1)
(e1) edge [loop above]  node {1}()
(c1) edge [loop above]  node {1}()
(a1) edge [loop above]  node {1}()
(e2) edge node {$e^2$}   (t2)
(c2) edge node {$c^2$}   (t2)
(a2) edge node {$h^2$}   (t2)
(e2) edge [loop above]  node {1}()
(c2) edge [loop above]  node {1}()
(a2) edge [loop above]  node {1}()
(a1) edge [bend left]  node {1}(a2)
(c1) edge [bend left]  node {1}(c2);
\end{tikzpicture}
\end{document}

そしてこれが現在の結果です:

改善が必要な点:

1. 2 つの曲げパスを双方向矢印の付いたものに変更します。
2. 重なりを避けるために、長い曲げパスを少し高く上げます。
3. 下部の 2 つのノード T1 と T2 を円から長方形に変更します。
4. これらの 6 つのラベル (e^2、c^2、h^2、...) を水平に揃えます。

ありがとう！

Answer 1

どうぞ！

\documentclass[border=0.2cm]{standalone}
% https://tex.stackexchange.com/questions/678743/struggling-in-drawing-a-path-graph-in-tikz

\usepackage{tikz}
\usetikzlibrary{automata, positioning}

\begin{document}
\begin{tikzpicture} [draw=black,
node distance = 3cm, 
on grid, 
auto,
every loop/.style={stealth-},
myrect/.style={rectangle,draw,inner sep=8pt}]

\node (e1) [state] {$E$};
\node (c1) [state, right = of e1] {$C$};
\node (a1) [state, right = of c1] {$A$};
\node (t1) [myrect, below = of c1] {$T1$};
\node (a2) [state, right = of a1] {$A$};
\node (c2) [state, right = of a2] {$C$};
\node (e2) [state, right = of c2] {$E$};    
\node (t2) [myrect, below = of c2] {$T2$};

% Arrows
\path [-stealth, thick]
(e1) edge node[midway,right=3pt] {$e^2$}   (t1)
(c1) edge node[midway,right] {$c^2$}   (t1)
(a1) edge node[midway,right] {$h^2$}   (t1)
(e1) edge [loop above]  node {1}()
(c1) edge [loop above]  node {1}()
(a1) edge [loop above]  node {1}()
(e2) edge node[midway,right] {$e^2$}   (t2)
(c2) edge node[midway,right] {$c^2$}   (t2)
(a2) edge node[midway,right=2pt] {$h^2$}   (t2)
(e2) edge [loop above]  node {1}()
(c2) edge [loop above]  node {1}()
(a2) edge [loop above]  node {1}()
(a1) edge [<->,bend left]  node {1}(a2)
(c1) edge [<->,bend left=50]  node {1}(c2);
\end{tikzpicture}
\end{document}