Htydjtk

I am trying to draw a figure, which repeatedly contains a similar type of pictures. Hence I am using .pic provided by tikz in the following way:

documentclass[tikz, border=2px]{standalone}

usetikzlibrary{arrows.meta, bending, shapes.misc, shapes.geometric}



% define colors and other constants

colorlet{line color}{black!30}

defline thickness{1pt}



% define primitive shapes for the drawing

tikzset{

line/.style={

    -, draw=line color, line width=line thickness},

z plus joint/.pic={

    draw[black, line width=line thickness, fill=gray!50]  (0,0)

          circle (0.5);

    draw[black, line width=line thickness, fill=white]  (0,0) circle (0.3);

    draw[line width=2pt, red, -{Triangle[bend, length=6pt, width=8pt]}] 

          (270:0.4) arc (270:150:0.4);

    draw[latex-,blue, shorten <=2pt] (-0.5, 0.5) -- ++ (-0.5, 0.5) 

          node[above=2pt, black]{#1};

         },

z minus joint/.pic={

    pic[yscale=-1, rotate=180] {z plus joint=#1};},

}





begin{document}

begin{tikzpicture}[node distance=2cm]

    path[line] (0, 0) pic {z plus joint=1} --

                (2, 0) pic {z minus joint=3} --

                (4, 0) pic {z minus joint=2} --

                (4, 2) pic {z plus joint=4} --

                (4, 4) pic {z minus joint=6};

end{tikzpicture}

end{document}

Please see below the generated figure:

I need the following two types of orientation for arrows:

• Left side titled arrow


• Right side titled arrow

I am looking for a way to provide an extra argument to the pic which can decide the orientation of the arrow. For example, see the following pseudo code:

begin{tikzpicture}[node distance=2cm]

    path[line] (0, 0) pic {z plus joint={1}{right}} --

                (2, 0) pic {z minus joint={3}{right}} --

                (4, 0) pic {z minus joint={2}{left}} --

                (4, 2) pic {z plus joint={4}{left}} --

                (4, 4) pic {z minus joint={6}{left}};

end{tikzpicture}

PS: Since the orientation has only two possible values, i.e., left and right, we can have left as default

Something like this? -1 for left and 1 for right.

documentclass[tikz, border=2px]{standalone}

usetikzlibrary{arrows.meta, bending, shapes.misc, shapes.geometric}



% define colors and other constants

colorlet{line color}{black!30}

defline thickness{1pt}



% define primitive shapes for the drawing

tikzset{

line/.style={

    -, draw=line color, line width=line thickness},    

pics/z plus joint/.style n args={2}{code={

    draw[black, line width=line thickness, fill=gray!50]  (0,0)

          circle (0.5);

    draw[black, line width=line thickness, fill=white]  (0,0) circle (0.3);

    draw[line width=2pt, red, -{Triangle[bend, length=6pt, width=8pt]}] 

          (270:0.4) arc (270:150:0.4);

    draw[latex-,blue, shorten <=2pt] (0.5*#2, 0.5) -- ++ (0.5*#2, 0.5) 

          node[above=2pt, black]{#1};

         }},

pics/z minus joint/.style n args={2}{code={

    pic[yscale=-1, rotate=180] {z plus joint={#1}{-1*#2}};}},

}





begin{document}

begin{tikzpicture}[node distance=2cm]

    path[line] (0, 0) pic {z plus joint={1}{1}}

     --         (2, 0) pic {z minus joint={3}{1}} --

                (4, 0) pic {z minus joint={2}{-1}} --

                (4, 2) pic {z plus joint={4}{-1}} --

                (4, 4) pic {z minus joint={6}{-1}}

                ;

end{tikzpicture}

end{document}