How to draw a text of several lines framed with tikz?

Question

I am drawing a diagram with tikzpicture. The main idea is to draw several boxes of texts framed, and link them with lines...

What I know is using \filldraw to draw boxes, \node to write one line of text, and \draw to make a line. But I have to adjust every coordinator of every element... So my question is:

1) Is it possible to write a text of several lines?

2) Is it possible to frame a text of serveral lines?

Could anyone help? Thank you very much!

Answer 1

A \node can contain several lines of text; you can use the align= key and manually change lines with \\, or you can specify a width for the text:

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
  \node[draw,align=center] (A) at (0,0) {some\\ text \\ spanning \\ several \\ lines};
  \node[draw,align=center,text width=1.5cm] at (3,0) {some text spanning several lines};
\end{tikzpicture}

\end{document}