# How to add distance between nodes in tikz picture

I am new as a tikz user and I face huge issues to do what I actually want to do ... I have to draw a graph which is parameterized by a value. For example, it means that the number of node at the second node level is between 0 and a value X. For this reason, I cannot draw the full graph, but I have to ellipse some part using \ldots for example.

To do that, I am using arrows and automata tikz libraries but I have an issue at the second node level : the 4 node I want to draw are overlaid... Here is the source:

 \documentclass{standalone}

\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,automata,shapes}
\usepackage[latin1]{inputenc}
\begin{document}
\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node distance=5cm,sibling distance=50cm,
semithick]
\tikzstyle{every state}=[
rounded rectangle,
fill=red,
draw=none,
text=white,
align=center,
inner sep=1pt,
text width=9.5em,
]
\tikzstyle{kernel} = [
inner sep=1pt,
node font=\itshape \small,
]

\node[state]    (A)                     {$A(0:DIM\_X, 0)$};
\node[state]    (B) [below left of=A]   {$A(1, 1)$};
\node[state]    (C) [below right of= A] {$A(DIM\_X-2, 1)$};
\node[state]    (D) [below of=B]        {$A(1, 2)$};
\node[state]    (E) [right of=D]        {$A(2, 2)$};
\node[state]    (F) [below of=C]        {$A(DIM\_X-2, 2)$};
\node[state]    (G) [left  of=F]        {$A(DIM\_X-3, 2)$};

\path (A)   edge node[kernel,swap]      {S(1, 1)}       (B)
edge node[kernel]   {S(DIM\_X-2, 1)}    (C)
;
\path (B)   edge[-,dotted] (C);
\end{tikzpicture}

\end{document}


Thanks for helping me :)

Use the positioning library.

\documentclass{standalone}

\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,automata,shapes,positioning}
\usepackage[latin1]{inputenc}
\begin{document}
\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node distance=5cm,sibling distance=50cm,
semithick]
\tikzstyle{every state}=[
rounded rectangle,
fill=red,
draw=none,
text=white,
align=center,
inner sep=1pt,
text width=9.5em,
]
\tikzstyle{kernel} = [
inner sep=1pt,
node font=\itshape \small,
]

\node[state]    (A)                     {$A(0:DIM\_X, 0)$};
\node[state]    (B) [below left=of A]   {$A(1, 1)$};
\node[state]    (C) [below right=of  A] {$A(DIM\_X-2, 1)$};
\node[state]    (D) [below=of B]        {$A(1, 2)$};
\node[state]    (E) [right=of D]        {$A(2, 2)$};
\node[state]    (F) [below=of C]        {$A(DIM\_X-2, 2)$};
\node[state]    (G) [left=of F]        {$A(DIM\_X-3, 2)$};

\path (A)   edge node[kernel,swap]      {S(1, 1)}       (B)
edge node[kernel]   {S(DIM\_X-2, 1)}    (C)
;
\path (B)   edge[-,dotted] (C);
\end{tikzpicture}

\end{document}