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I want to construct a series of circles which ranks shoulder to shoulder in every page footer. The number of circles is just the number of total pages, that is to say, each circle represents a page. At the center of each circle is the current page number.

It's easy to achieve this by foreach from pgf if diametes of all these circles are same. However, I want the circle which represents the current page has a larger diameter.

The typeset is like the attached figure produced by the following MWE.
Anyone can help me with this?

MWE:

documentclass{article}

usepackage{fancyhdr,geometry,color,tikz}

geometry{showframe}



begin{document}

pagestyle{fancy}

fancyhf{}

renewcommand{footrulewidth}{0.4pt}

some text...



cfoot{

begin{tikzpicture}

  draw[fill=gray,text=white,radius=0.5](0,0)circle node{1};

  draw[fill=red,text=white,radius=1](1.5,0)circle node{2};

  draw[fill=gray,text=white,radius=0.5](3,0)circle node{3};  

end{tikzpicture}

}

end{document}

Something like that?

documentclass{article}

usepackage{fancyhdr,geometry,lastpage,refcount,lipsum,tikz}

geometry{showframe}

usetikzlibrary{positioning}

begin{document}

pagestyle{fancy}

fancyhf{}

renewcommand{footrulewidth}{0.4pt}

some text...

newcounter{lastpagenumber}%

setcounter{lastpagenumber}{getrefbykeydefault{LastPage}{page}{1}}%



cfoot{begin{tikzpicture}

coordinate (cn-0);

foreach X [remember=X as LastX (initially 0)] in {1,...,thelastpagenumber}

{ifnumX=thepage

 node[circle,fill=red,text=white,minimum size=1cm,right=0pt of cn-LastX] (cn-X) {X};

 else

 node[circle,fill=gray,text=white,minimum size=0.5cm,right=0pt of cn-LastX] (cn-X) {X};

 fi

}

end{tikzpicture}

}

lipsum[1-31]

end{document}

Of course, one can customize the output in many ways.

documentclass{article}

usepackage{fancyhdr,geometry,lastpage,refcount,lipsum,tikz}

geometry{showframe}

usetikzlibrary{positioning}

begin{document}

pagestyle{fancy}

fancyhf{}

renewcommand{footrulewidth}{0.4pt}

some text...

newcounter{lastpagenumber}%

setcounter{lastpagenumber}{getrefbykeydefault{LastPage}{page}{1}}%



cfoot{begin{tikzpicture}

coordinate (cn-0);

foreach X [remember=X as LastX (initially 0)] in {1,...,thelastpagenumber}

{ifnumX=thepage

 node[circle,draw,thick,font=sffamilyLargebfseries,fill=red,text=white,minimum size=1cm,right=0pt of cn-LastX] (cn-X) {X};

 else

 node[circle,draw,font=sffamilybfseries,fill=gray,text=white,minimum size=0.5cm,right=0pt of cn-LastX] (cn-X) {X};

 fi

}

end{tikzpicture}

}

lipsum[1-31]

end{document}

And if you find circles a bit dull, you could do

documentclass{article}

usepackage{fancyhdr,geometry,lastpage,refcount,lipsum,tikzducks,tikzlings}

geometry{showframe}

usetikzlibrary{positioning,backgrounds}

begin{document}

pagestyle{fancy}

fancyhf{}

renewcommand{footrulewidth}{0.4pt}

some text...

newcounter{lastpagenumber}%

setcounter{lastpagenumber}{getrefbykeydefault{LastPage}{page}{1}}%



cfoot{begin{tikzpicture}

coordinate (cn-0);

foreach X [remember=X as LastX (initially 0)] in {1,...,thelastpagenumber}

{ifnumX=thepage

 node[font=sffamilyLargebfseries,text=white,minimum size=1cm,right=0pt of cn-LastX] (cn-X) {X};

 begin{scope}[scale=0.4,on background layer,shift={(cn-X.center)},yshift=-3em]

 marmot

 end{scope}

 else

 node[font=sffamilybfseries,text=black,minimum size=0.5cm,right=0pt of cn-LastX] (cn-X) {X};

 begin{scope}[scale=0.3,on background layer,shift={(cn-X.center)},yshift=-3em]

 koala

 end{scope}

 fi

}

end{tikzpicture}

}

lipsum[1-31]

end{document}