Cfrgtkky

I want to connect two nodes with that are not aligned either in X or Y dimension, node 2 is to the lower right of node 1 (for the sake of the argument). The line should start from node 1, goes to the right horizontally until it's above node 2, then I want it to make a U turn and connect to node 2 from the right.

The following code produces kind of what I want:

documentclass[12pt]{standalone}

usepackage{amssymb,amsfonts,amsmath}

usepackage{tikz}



usetikzlibrary{shapes.geometric}

usetikzlibrary{scopes}

usetikzlibrary{decorations.pathreplacing}

usetikzlibrary{calc}

usetikzlibrary{positioning}





tikzset{copy/.style={circle,inner sep=0pt,fill=black,minimum

    size=5pt} }



deftnboxsize{6mm}



tikzset{box/.style={rectangle,draw=black,fill=none, minimum

    width=tnboxsize, minimum height=tnboxsize,

    shape border uses incircle}}



tikzset{blank/.style={rectangle,inner

    sep=0pt,draw=none,fill=none,minimum size=0pt} }



tikzset{blankbig/.style={rectangle,inner sep=0pt,draw=none,fill=none,minimum

    size=tnboxsize} }





begin{document}

    begin{tikzpicture}[thick]

      node[blank] (out1) {};

      node[blank] (out2) [below=0.5 of out1] {};

      node[blank] (out3) [below=0.5 of out2] {};



      node[blank] (anchorout) at ($(out1)!0.5!(out2)$) {};

      node[copy] (copy) [right=0.6 of anchorout] {};

      node[box] (c) [right=of out3] {$C$};



      draw [-] (out1) -- (copy);

      draw [-] (out2) -- (copy);

      draw [-] (out3) -- (c);

      draw [-] (copy) -- +(0.75,0) .. controls +(0.7,0) and +(0.7,0) .. (c);

end{tikzpicture}



end{document}

Like this:

However, to do this, I had to manually adjust the numbers for the controlling points in
draw [-] (copy) -- +(0.75,0) .. controls +(0.7,0) and +(0.7,0) .. (c).

For example, when these numbers are messed up, the picture looks like this:

Is there a way to enforce the behavior like in the first picture without manually adjusting the positions of the control points?

some how similar to propositions in above comments, however also address some off-topic issues:

documentclass[12pt, tikz, margin=3mm]{standalone}

usepackage{amssymb,amsfonts,amsmath}



usetikzlibrary{calc,

                decorations.pathreplacing,

                positioning,

                shapes.geometric, scopes}

tikzset{

 copy/.style = {circle,inner sep=0pt,fill=black,minimum size=5pt},

  box/.style = {rectangle,draw=black,fill=none, 

                minimum width=tnboxsize, minimum height=tnboxsize,

                shape border uses incircle},

blank/.style = {rectangle,inner sep=0pt, draw=none,fill=none, minimum size=0pt}, % <--- not needed, rather use coordinate 

blankbig/.style = {rectangle,inner sep=0pt,draw=none,fill=none, minimum size=tnboxsize} 

        }

deftnboxsize{6mm}





begin{document}

    begin{tikzpicture}[thick,

    node distance = 5mm and 6mm  % <--- added

                        ]

    coordinate                 (out1);

    coordinate[below=of out1]  (out2);

    coordinate[below=of out2]  (out3);



    node[copy] (copy)  [right=of $(out1)!0.5!(out2)$]  {}; % <--- removed one coordinate

    node[box]  (c)     [right=of out3 -| copy]         {$C$};



    draw   (out1) -- (copy)  % <--- slightly shorter code

            (out2) -- (copy) 

            (out3) -- (c) 

            (copy.east) -- (copy -| c.east) % <--- auxiliary coordinate 



                        .. controls +(0.5,0) and +(0.5,0) .. (c.east);

end{tikzpicture}



end{document}

You can do the following (just changing tour last draw command):

1. 
   

   draw from copy to the point that has copy y-coord and the east point of c as x-coord:

   
   
   

   (copy) -- (copy -| c.east)
   
   

   
   


2. 
   

   and then go to c.east using a curve starting with angle 0, arriving at angle 0, and looseness 2 (that should be half a circle, more or less):

   
   
   

   to [out=0, in=0, looseness=2]
   
   

   
   

Like that:

 draw (copy) -- (copy -| c.east) 

      to[out=0, in=0, looseness=2] (c.east);

You get:

Full MWE:

documentclass[12pt]{standalone}

usepackage{amssymb,amsfonts,amsmath}

usepackage{tikz}



usetikzlibrary{shapes.geometric}

usetikzlibrary{scopes}

usetikzlibrary{decorations.pathreplacing}

usetikzlibrary{calc}

usetikzlibrary{positioning}





tikzset{copy/.style={circle,inner sep=0pt,fill=black,minimum

    size=5pt} }



deftnboxsize{6mm}



tikzset{box/.style={rectangle,draw=black,fill=none, minimum

    width=tnboxsize, minimum height=tnboxsize,

    shape border uses incircle}}



tikzset{blank/.style={rectangle,inner

    sep=0pt,draw=none,fill=none,minimum size=0pt} }



tikzset{blankbig/.style={rectangle,inner sep=0pt,draw=none,fill=none,minimum

    size=tnboxsize} }





begin{document}

    begin{tikzpicture}[thick]

      node[blank] (out1) {};

      node[blank] (out2) [below=0.5 of out1] {};

      node[blank] (out3) [below=0.5 of out2] {};



      node[blank] (anchorout) at ($(out1)!0.5!(out2)$) {};

      node[copy] (copy) [right=0.6 of anchorout] {};

      node[box] (c) [right=of out3] {$C$};



      draw [-] (out1) -- (copy);

      draw [-] (out2) -- (copy);

      draw [-] (out3) -- (c);

      %

      draw (copy) -- (copy -| c.east)

          to[out=0, in=0, looseness=2] (c.east);

end{tikzpicture}



end{document}