Tikz and alignment with two nodes on the same line

Question

Another minimal example:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}

\node[draw=black,%
rounded corners=2pt,%
rectangle,%
bottom color=black!80!white] (A) {node aligned on left margin}; 

\node[draw=black,%
rounded corners=2pt,% 
rectangle,% 
bottom color=black!80!white] {node aligned on the right margin};


\end{tikzpicture}
\end{document}

in this case I'd like to have the first node aligned on the left margin of the paper and the second one on the right.

Answer 1

I suggest you try it this way:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\path (0,0) node[draw=black, rounded corners=2pt, rectangle, bottom color=black!80!white, anchor=west] (A) {node aligned on left margin} -- (\textwidth,0) node[draw=black, rounded corners=2pt, rectangle, bottom color=black!80!white, anchor=east] (B) {node aligned on the right margin};
\end{tikzpicture}
\end{document}

The nodes are on a path, which spans the width of the text on the page (\textwidth).

The anchors of the nodes are necessary to make sure the nodes do not get off the page.