Btukfyl

I'm trying create a command that will be used in a barycentric cs:.

I will use the barycentric cs a lot of time to get a node the middle of others, so I'm trying to make it less painfull for myself. It will also be used in another command that uses a list as its parameter.

Let's say I have this code:

documentclass[border=5mm]{standalone}



usepackage{tikz}



usetikzlibrary{matrix}

usetikzlibrary{positioning}



begin{document}

    tikzset{

        basic/.style={

            draw, 

            rounded corners=2pt, 

            thick, 

            text width=8em, 

            align=flush center, 

            node distance=2em

        }

    }

    begin{tikzpicture}

        matrix[row sep=2em, column sep=4em, every node/.style={basic}] {

            node(a){text}; & node(c){text}; \

            node(b){text}; & node(d){text}; \

            % Loads of other nodes

        };

    end{tikzpicture}

end{document}

I'm trying to create a command so that, instead of using node (bc#) at (barycentric cs:a=1,b=1,c=1,d=1,<...>) {text};, I only have to write node (x) at (baricentric cs:listforbarycentrics{a,b,c,d}) {text};.

I tried with this command code:

newcommand{listforbarycentrics}[1]{foreach n in {#1}{

        n=1,

    };

}

However, it doesn't works. It may be because a comma at the end of the list in the barycentric cs: (like thisbarycentric cs:a=1,b=1,c=1,d=1,) creates an error, however I'm not sure.

Something like this?

documentclass[border=5mm]{standalone}



usepackage{tikz}



usetikzlibrary{matrix}

usetikzlibrary{positioning}



begin{document}

    tikzset{

        basic/.style={

            draw, 

            rounded corners=2pt, 

            thick, 

            text width=8em, 

            align=flush center, 

            node distance=2em

        },

        barycentric setup/.code={foreach X [count=Y] in {#1}

        {ifnumY=1

         xdefbaryarg{X=1}

        else

         xdefbaryarg{baryarg,X=1}

        fi}},

        barycentric list/.style={barycentric setup={#1},insert path={%

        (barycentric cs:baryarg)}}

    }

    begin{tikzpicture}

        matrix[row sep=2em, column sep=4em, every node/.style={basic}] {

            node(a){text}; & node(c){text}; \

            node(b){text}; & node(d){text}; \

            % Loads of other nodes

        };

        path[barycentric list={a,b,c,d}] node {center}; 

    end{tikzpicture}

end{document}