Orsdxy

I am trying to draw a regular pentagon on a graph (I need to add more stuff to it, so having the axis is desirable), but when I try to draw the two together they do not line up. Here is my code:

documentclass{article}



usepackage{pgfplots}

pgfplotsset{compat=1.15}

usepgflibrary{shapes.geometric}



begin{document}



begin{figure}

centering



begin{tikzpicture}[scale=1.25,line width=1pt]

begin{axis}[

color= black,

xmin=-9.9, 

xmax=9.9, 

ymin=-9.9, 

ymax=9.9, 

axis equal image, 

axis lines=middle, 

xticklabels={}, 

yticklabels={},

font=scriptsize,

xlabel = $x$,

ylabel = $y$,

inner axis line style={stealth-stealth},

xtick distance=1,

ytick distance=1,

legend style={draw=none},

ticks=none,

]



node[black] at (0,0) {and not here?};



end{axis}



foreach a in {5}{

    node [regular polygon, regular polygon sides=a, minimum size=5cm, 

draw] at (0,0) (A) {};

    foreach i in {1,...,a}

    {%

      node [label=90+72*(i-1):i, inner sep=1pt] at (A.corner i) {};

    }

  }



node[black] at (0,0) {why is it here?};



end{tikzpicture}



caption{A regular pentagon}

label{regpent}

end{figure}



end{document}

Here is the image that is produced:

I would like to have the center of the pentagon line up with the origin of the axis. My guess is that the coordinate system is different in the axis environment and outside it, but I'm not sure.

Did you try to draw the pentagon inside axis?

documentclass{article}



usepackage{pgfplots}

pgfplotsset{compat=1.15}

usepgflibrary{shapes.geometric}



begin{document}



begin{figure}

centering



begin{tikzpicture}[scale=1.25,line width=1pt]

begin{axis}[

color= black,

xmin=-9.9, 

xmax=9.9, 

ymin=-9.9, 

ymax=9.9, 

axis equal image, 

axis lines=middle, 

xticklabels={}, 

yticklabels={},

font=scriptsize,

xlabel = $x$,

ylabel = $y$,

inner axis line style={stealth-stealth},

xtick distance=1,

ytick distance=1,

legend style={draw=none},

ticks=none,

]



node[black] at (0,0) {and not here?};



node [regular polygon, regular polygon sides=5, minimum size=5cm, 

draw] at (0,0) (A) {};



node[black] at (0,0) {why is it here?};



end{axis}



end{tikzpicture}



caption{A regular pentagon}

label{regpent}

end{figure}



end{document}

Note: I know there is some problem with foreach inside axis but I don't know how to solve it now.

as supplement to @Ignasi answer. with simplified axis options and with labeling of pentagon corners:

documentclass{article}



usepackage{pgfplots}

pgfplotsset{compat=1.15}

usepgflibrary{shapes.geometric}



begin{document}



begin{figure}

centering



begin{tikzpicture}[

lbl/.style = {fill=white, inner sep=2pt, font=footnotesize, pos=1.1}

                    ]

defa{5}

begin{axis}[

axis lines=middle,

     ticks=none,

xlabel = $x$,

ylabel = $y$,

xmin=-10, xmax=10,

ymin=-10, ymax=10,

            ]

% poygon

node[regular polygon,

      regular polygon sides=a, draw,

      minimum size=22mm] (A) at (0,0) {i'm in center};

end{axis}

% corners labels 

foreach i in {1,...,a}%

{

path (A.center) -- node [lbl] {i} (A.corner i) ;

}



end{tikzpicture}



caption{A regular pentagon}

label{regpent}

end{figure}



end{document}