inserting long text in a node with a fixed width

Question

Using the following code, is it possible to insert the long text (in the node) inside a framed box with certain background colour, with a certain defined width and a height that accommodates the long text.

    \documentclass{beamer}
\beamertemplatenavigationsymbolsempty
\usepackage{tikz}
\usepackage{pgfplots}
\begin{document}
\begin{frame}[fragile,t]
\frametitle{1}
\begin{tikzpicture}[scale=.9, transform shape]
\draw [thick,-latex](0,0) -- (6.2,0) node [black, xshift=.3cm, yshift=0cm] {$x$};
\draw [thick,-latex](0,0) -- (0,5) node [black, xshift=0cm, yshift=.3cm] {$u$};
\draw [ultra thick,blue] (0,2.84) -- +(-40:4.44cm) node [pos=.5,red] {x} node [pos=.5, xshift=4.8cm, yshift=.2cm] {very very very very very very very long long long long long long long text} node [pos=0,circle, draw, black, fill=black, scale=0.5]{}  node [pos=1,circle, draw, black, fill=black, scale=0.5]{};
\end{tikzpicture}
\end{frame}
\end{document}

to make it look like this

The answer by Zarko gives more control than the answer suggested by percusse. It controls the background colour, the frame colour, and the connection between the text and node position; which are not addressed by the answer suggested by percusse. — Hany, Jul 10 '18 at 14:25

Zarko · Accepted Answer · 2018-07-10T16:20:57.673

\documentclass{beamer}
\beamertemplatenavigationsymbolsempty
\usepackage{tikz}
\usepackage{pgfplots}
\begin{document}
\begin{frame}[fragile,t]
\frametitle{1}

\begin{tikzpicture}[
    dot/.style = {circle, fill, node contents={}},
    every pin/.append style = {pin distance=9mm, pin edge={black, semithick},
                               text width=24mm, fill=orange!20}
                    ]
\draw [thick,-latex](0,0) -- (6.2,0) node [black, xshift=.3cm, yshift=0cm] {$x$};
\draw [thick,-latex](0,0) -- (0,5) node [black, xshift=0cm, yshift=.3cm] {$u$};
\draw [ultra thick,blue] (0,2.84) --
    node [dot,pin=60:very very very very very very very long long long long long long long text] + (-40:4.44cm);
\end{tikzpicture}

\end{frame}
\end{document}

gives:

is this what you looking for?

in mwe above i define node style dot for black circle on curve, text is added as pin to this node- pin style among others contain text width=<width> option. this option automatically break long text into more lines (long as determined in <width>)

addedndum:

more control on pin and text anchors enables solutions provided in Qrrbrbirlbel answer on the question tikz-adjusting-pin-anchor. adoption to your question is:

\documentclass{beamer}
\beamertemplatenavigationsymbolsempty
\usepackage{tikz}

\begin{document}
\begin{frame}[fragile,t]
\frametitle{1}

\begin{tikzpicture}[
    dot/.style = {circle, fill, outer sep=0pt, node contents={}},
aligned pin/.style args={[#1]#2:#3}%
    {pin={[pin distance=9mm, pin edge={black, semithick, shorten >=-8pt},
           inner sep=0pt, label={[append after command={%
                node[text width=32mm, fill=orange!20, outer sep=0pt,%
                     at=(\tikzlastnode.#2),% position of pin
                     anchor=#1,% for node withpin text
                    ]{#3}}]center:{}}% for details see https://tex.stackexchange.com/questions/246995/
          ]#2:{}}%
    }
                    ]
\draw [thick,-latex](0,0) -- (6.2,0) node [black, xshift=.3cm, yshift=0cm] {$x$};
\draw [thick,-latex](0,0) -- (0,5) node [black, xshift=0cm, yshift=.3cm] {$u$};
\draw [ultra thick,blue] (0,2.84) --
    node [dot,aligned pin={[west]45:very very very very very very very long long long long long long long text}] + (-40:4.44cm);
\end{tikzpicture}

\end{frame}
\end{document}

which gives:

I appreciate very much your effort. Just one comment please, can the joining black line position be modified (ex. to the left edge of the text instead of the bottom edge; or to the center of the box instead of the corner). — Hany, Jul 10 '18 at 14:10
@Hany, see addendum. it enable more control on pin text positioning. — Zarko, Jul 10 '18 at 16:23

inserting long text in a node with a fixed width

1 Answers1

Linked