General ⇒ my content is missing when I create a graph by tikz package

[fxpfxp]

Hi,
Recently, I create a graph by tikz package. But my content is not visible anymore. Is anyone can help me?
Thanks very much.

Here is the source file: (my contend "Hello world" is missing)

\documentclass{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{10pt}%
%%%
\usetikzlibrary{arrows,shapes,positioning,shadows,trees}

\tikzset{
basic/.style = {draw, text width=2cm, drop shadow, font=\sffamily, rectangle},
root/.style = {basic, rounded corners=2pt, thin, align=center,
fill=green!30},
level 2/.style = {basic, rounded corners=6pt, thin,align=center, fill=green!60,
text width=8em},
level 3/.style = {basic, thin, align=left, fill=pink!60, text width=6.5em}
}

\begin{document}

Hello world!


\begin{tikzpicture}[
level 1/.style={sibling distance=40mm},
edge from parent/.style={->,draw},
>=latex]

% root of the the initial tree, level 1
\node[root] {Drawing diagrams}
% The first level, as children of the initial tree
child {node[level 2] (c1) {Defining node and arrow styles}}
child {node[level 2] (c2) {Positioning the nodes}}
child {node[level 2] (c3) {Drawing arrows between nodes}};

% The second level, relatively positioned nodes
\begin{scope}[every node/.style={level 3}]
\node [below of = c1, xshift=15pt] (c11) {Setting shape};
\node [below of = c11] (c12) {Choosing color};
\node [below of = c12] (c13) {Adding shading};

\node [below of = c2, xshift=15pt] (c21) {Using a Matrix};
\node [below of = c21] (c22) {Relatively};
\node [below of = c22] (c23) {Absolutely};
\node [below of = c23] (c24) {Using overlays};

\node [below of = c3, xshift=15pt] (c31) {Default arrows};
\node [below of = c31] (c32) {Arrow libraryhfvkjvjlljljhlhjlglkjhlklhlkjlkjkhj;klj;lj};
\node [below of = c32] (c33) {Resizing tips};
\node [below of = c33] (c34) {Shortening};
\node [below of = c34] (c35) {Bending};
\end{scope}

% lines from each level 1 node to every one of its "children"
\foreach \value in {1,2,3}
\draw[->] (c1.195) |- (c1\value.west);

\foreach \value in {1,...,4}
\draw[->] (c2.195) |- (c2\value.west);

\foreach \value in {1,...,5}
\draw[->] (c3.195) |- (c3\value.west);
\end{tikzpicture}
\end{document}

[Johannes_B]

Hi, with the help of package preview, you are just showing the picture. Comment the lines related to it out, and everything will be fine.

Code: Select all

%\usepackage[active,tightpage]{preview}
%\PreviewEnvironment{tikzpicture}
%\setlength\PreviewBorder{10pt}%