Htydjtk

I have a question, how can have the shortest set of tikz code for this pecture

i am tring to optimize this code:

documentclass{article}

usepackage{amsmath}

usepackage{tikz}

begin{document}

La version de TikZ est : pgfversion



    vfill  



begin{center}

    begin{tikzpicture}

    %

        draw (0,1) -- (1,0);

    draw (1,0) -- (0,-1);

    draw (0,-1) -- (-1,0);

    draw (-1,0) -- (0,1);

    draw (0,0) circle (1);

    draw ((0,1) circle (1);

    draw (0,-1) circle (1);

    draw (-1,0) circle (1);

    draw (1,0) circle (1);

    %

        draw (0,2) -- (2,0);

        draw (2,0) -- (0,-2);

        draw (0,-2) -- (-2,0);

        draw (-2,0) -- (0,2);

        draw (0,0) circle (2);

        draw ((0,2) circle (2);

        draw (0,-2) circle (2);

        draw (-2,0) circle (2);

        draw (2,0) circle (2);

    end{tikzpicture}   

end{center}

end{document}

Here is a solution (not the shortest):

documentclass[tikz]{standalone}

begin{document}

begin{tikzpicture}

  draw

  circle (1) circle(2)

  (0:1) --(90:1) -- (180:1) -- (270:1) -- cycle

  (0:1) circle(1) (90:1) circle(1) (180:1) circle(1) (270:1) circle(1)

  (0:2) --(90:2) -- (180:2) -- (270:2) -- cycle

  (0:2) circle(2) (90:2) circle(2) (180:2) circle(2) (270:2) circle(2);

end{tikzpicture}

end{document}

Just for fun:

documentclass[tikz,margin=5mm]{standalone}

begin{document}

begin{tikzpicture}



draw (0,0) circle (1) circle (2);



foreach t/n in {0/1,90/2,180/3,270/4}{

  draw (t:1)coordinate(n) circle (1)  ;}



foreach t/m in {0/5,90/6,180/7,270/8}{

  draw (t:2)coordinate(m) circle (2) ;}



draw (1)--(2)--(3)--(4)--cycle;

draw (5)--(6)--(7)--(8)--cycle;  





end{tikzpicture}

end{document}

One path for everything. ;-)

documentclass[tikz,border=3.14mm]{standalone}

begin{document}

begin{tikzpicture}

  draw[rotate=45]  foreach Y in {1,2} 

   {(0,0) circle[radius=Y]

    ({-Y/sqrt(2)},{-Y/sqrt(2)}) rectangle ({Y/sqrt(2)},{Y/sqrt(2)})

   foreach X in {45,135,225,315}

   { (X:Y) circle[radius=Y]}};

end{tikzpicture}

end{document}

Not as much as @marmot's nicely optimised answer but a try (gives more knobs for fun though):

documentclass[tikz]{standalone}

begin{document}

begin{tikzpicture}[mystyle/.style={circle,draw,fill=none,minimum size=20, line width = 0.1pt}]

foreach x/y/z in {0/0/2,0/1/2,0/-1/2,-1/0/2,1/0/2,0/0/4,0/1/4,0/-1/4,-1/0/4,1/0/4}

node [mystyle,  minimum size = z cm, color =black]  (2) at (x, y) {};

foreach x/y in {-0.7/0.7, -1.41/1.41}

draw[rotate=45, line width = 0.1pt] (x , x ) rectangle (y, y);

end{tikzpicture}

end{document}

which gives