# applying text in box inside a node to draw plot line

The following code is from the answer to this question. How to apply it to a draw plot line code from the answer to this question.

I mean I want to apply the code of (inserting text in a box inside a node applied to the green line), to the blue line drawn by (draw plot within the axis definition).

    \documentclass{beamer}
\usepackage{tikz}
\usepackage{pgfplots}
\begin{document}
\begin{frame}[fragile,t]
\frametitle{1}
\tikzset{
declare function={
%        myslope2(\x) = 24 - \x*(24/48);
myslope(\x) = 8 - \x*(8/32);
mycomplexfunction(\x) = sin(60*pow(\x,1.2)) + 6;
},
}
\begin{tikzpicture}[
dot/.style = {circle, black, scale=.8, fill, node contents={}},
aligned pin/.style args={[#1]#2:#3}%
{pin={[pin distance=10mm, pin edge={black, very thick, shorten >=-12pt},
label={[append after command={%
node[text width=35mm, color=black, fill=yellow!35, xshift=0cm, yshift=0cm, outer sep=0pt, inner sep=5pt,%
at=(\tikzlastnode.#2),
anchor=#1,
]{#3}}]center:{}}
]#2:{}}%
},
scale=.9, transform shape]
\begin{axis}[
axis lines=center, axis line style={black, thick,-latex},
axis y line=left,axis x line=bottom,
tick style={line width=.04cm, color=black, line cap=round},
font=\normalsize,color=black,
xmin=0, xmax=64,
xtick={0,16,32}, xticklabels={0,16,32},
ymin=0, ymax=16,
ytick={4,8}, yticklabels={4,8},
tickwidth=.2cm,
xlabel={P}, xlabel style={right},
ylabel={M}, ylabel style={above},
xticklabel style={inner xsep=0cm, xshift=0cm,yshift=-.1cm},
yticklabel style={inner ysep=0cm,xshift=-.1cm,yshift=0cm},
samples=200,
clip=false]
\draw[ultra thick,blue] plot[samples at={0,16,32},mark=*,mark options={black}] (axis cs:\x,{myslope(\x)});
\draw[thick,black,densely dotted] (axis cs:0,{myslope(16)}) -- (axis cs:16,{myslope(16)}) node [black, xshift=.46cm, yshift=.05cm] {A} -- (axis cs:16,0);
\end{axis}
\draw [thick,green] (0,2.84) -- node [dot, aligned pin={[south west]45:very very very very long long long  long text}] + (-40:4.44cm) 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}


• sorry, but i don't understand, what you like to obtain. add sinus wave to this picture? no one example has green line. – Zarko Jul 12 '18 at 8:25
• The \draw [thick,green] (0,2.84) defines the green line with a text pinned to a node in it. I want to apply this text pinned to the node code to the blue line code (\draw[ultra thick, blue] plot) within the {axis} – Hany Jul 12 '18 at 9:26
• and why this line is not in your mwe? please, make your mwe more complete. – Zarko Jul 12 '18 at 9:32
• The lines codes are in my mwe. I tried ( \draw[ultra thick, blue] plot[samples at={0,16,32},mark=*,mark options={black}] (axis cs:\x,{myslope(\x)}) node [dot, aligned pin={[south west]45:very very very very long long long long text}]; ) but the text is pinned to the end of the line not to its center. – Hany Jul 12 '18 at 9:34
• The green line is over the blue line, if you enlarge the view you can see them – Hany Jul 12 '18 at 9:59

I tried the following code \node at (axis cs:16,{myslope(16)}) [dot, aligned pin={[south west]45:very very very very long long long long text}];  and it works fine.