Graphics, Figures & Tables ⇒ Vertical Alignment in Nodes

[SAKDOSS]

Hello,

I am quite new in tikZ and I have two alignment problems with the following code:

Code: Select all

  \begin{tikzpicture}
    % Styles
    \tikzstyle{cluster}=[
      thick,
      densely dashed,
      fill=gray!20,
      ellipse,
      text width=0.3cm,
      text height=0.6cm,
      text centered,
      draw
    ]
    \tikzstyle{arrow}=[->,>=latex]

    % Clusters
    \node[cluster] (c1) at (0,0){$ $};
    \node[cluster] (c2) at (1.6cm,0){$b$};
    
    % Arrow
    \draw[arrow] (c1) to[out=-25, in=-155] (c2) 
       node[midway]{$a$};
  \end{tikzpicture}

It gives the following picture

tikZ-alignment.png (5.16 KiB) Viewed 8550 times

I don't understand;

1. why b is not vertically centered in the ellipse on the right;
2. why a is not centered on the arrow.

Do you know what is wrong in my code ?

Thanks in advance !

[alainremillard]

1. why b is not vertically centered in the ellipse on the right;

In your definition of cluster, replace text height=0.6cm with minimum height=1.4cm. The 1.4cm might need some adjustment. With minimum height, you specify the height of the node itself.

2. why a is not centered on the arrow.

If you want to put a node on an arrow, the command must be place between the arrow description and the destination. This should do the trick

Code: Select all

\draw[arrow] (c1) to[out=-25, in=-155] node[midway]{$a$} (c2) ;

Have a nice day
Alain Rémillard

[SAKDOSS]

Perfect, thanks !