How can I connect nodes around a circle node?

Question

I want to I connect nodes around a center node. Example could be seen as below:

my approach:

\documentclass[border={10pt}]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,arrows}
\begin{document}
\begin{tikzpicture}
    [%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        node distance=1cm,
        arrow/.style={->, >=stealth, very thick},
        block/.style={rectangle, fill=blue!20, text centered,
                rounded corners, minimum height=1em}
    ]%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \node[block] (A) {A};
    \node[block] (B) [above=of A]  {B};
    \node[block] (K) [right=of B]  {K};
    \node[block] (C) [left=of A]   {C};
    \node[block] (D) [right=of A]  {D};
    \node[block] (E) [below=of A]  {E};
    \node[block] (F) [right=of E]  {F};
    \node[block] (G) [left=of E]  {G};
%connect nodes
\draw [arrow] (B.south) -- ++(0,-0) -| (A.north);
\draw [arrow] (C.east) -- ++(0,-0) -| (A.west);
\draw [arrow] (E.north) -- ++(0,-0) -| (A.south);
\draw [arrow] (D.west) -- ++(0,-0) -| (A.east);
\draw [arrow] (F.north) -- ++(0,-0) -| (A.southeast);
\draw [arrow] (G.north) -- ++(0,-0) -| (A.west);
\draw [arrow] (K.south) -- ++(0,-0) -| (A.east);

\end{tikzpicture}
\end{document}

output:

where I was not able to put nodes into cross locations, in between B - D , D - E , C - E , and B - C.

Related: https://tex.stackexchange.com/a/269910/127048

Answer 1

I wouldn't use positioning for this. Place the A node as you did, then use polar coordinates to place the other nodes. You can set angles and distances however you like for each node.

Since it seems you want straight arrows, don't use -|, which makes your lines horizontal then vertical. Simplify your code and use \draw [arrow] (B) -- (A);

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
    [%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        arrow/.style={->, >=stealth, very thick},
        block/.style={rectangle, fill=blue!20, text centered,
                rounded corners, outer sep=0pt}
    ]%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \node[block] (A) {A};
    \node[block] at (120:2) (B) {B};
    \node[block] at (60:1.5) (K) {K};
    \node[block] at (150:1.5) (C) {C};
    \node[block] at (-10:2) (D) {D};
    \node[block] at (240:2) (E) {E};
    \node[block] at (300:1.5) (F) {F};
    \node[block] at (210:1.5) (G) {G};
%connect nodes
\draw [arrow] (B) -- (A);
\draw [arrow] (C.south east) -- (A.west);
\draw [arrow] ([yshift=2mm]A.west) -- ([yshift=2mm]C.south east);
\draw [arrow] (E) -- (A);
\draw [arrow] (D) -- (A);
\draw [arrow] (F) -- (A);
\draw [arrow] (G) -- (A);
\draw [arrow] (G) -- (C);
\draw [arrow] (K) -- (A);

\end{tikzpicture}
\end{document}