Call for node distance as a variable in TikZ












5















Is it possible to use the node distance as a variable while expressing coordinates of new nodes with Calc and Positioning libraries? What I want to have is everything within a single piece of code for tikz picture.



This is what I have now.



documentclass[12pt, a4paper]{article}
usepackage{tikz}
usetikzlibrary{automata, positioning, arrows,calc}

begin{document}
begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node distance=2cm,semithick,on grid]

tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
node[state,label=center:$a$,inner sep=0pt] (a) {};
node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:1cm) $) {};
node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:1cm)$) {};

path[->] (a) edge node {$1$} (b)
(c) edge node[right] {$1$} (b)
(b) edge [loop right] node[above] {$0,1$} (b);
path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

end{tikzpicture}
end{document}


I would like to be able to change the below expression with something like:



$(a) + sqrt(1/3)*2*(1:nodedistance)$


Then if I would be copying the code elsewhere, such as a presentations, I would be able to change all these distances at once. Is that possible? If not, introducing a variable in the first line of the TikZ code, and using it afterwards instead the "nodedistance", would also do.



Sorry if it's a dull question, I'm pretty new to TikZ.










share|improve this question







New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • Welcome to TeX.SE! This is not at all a dumb question. Are you aware of this post, I guess that /tikz/node distance/.append code={...} does what you want. This allows you to store the distance in a key that you can use.

    – marmot
    7 hours ago
















5















Is it possible to use the node distance as a variable while expressing coordinates of new nodes with Calc and Positioning libraries? What I want to have is everything within a single piece of code for tikz picture.



This is what I have now.



documentclass[12pt, a4paper]{article}
usepackage{tikz}
usetikzlibrary{automata, positioning, arrows,calc}

begin{document}
begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node distance=2cm,semithick,on grid]

tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
node[state,label=center:$a$,inner sep=0pt] (a) {};
node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:1cm) $) {};
node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:1cm)$) {};

path[->] (a) edge node {$1$} (b)
(c) edge node[right] {$1$} (b)
(b) edge [loop right] node[above] {$0,1$} (b);
path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

end{tikzpicture}
end{document}


I would like to be able to change the below expression with something like:



$(a) + sqrt(1/3)*2*(1:nodedistance)$


Then if I would be copying the code elsewhere, such as a presentations, I would be able to change all these distances at once. Is that possible? If not, introducing a variable in the first line of the TikZ code, and using it afterwards instead the "nodedistance", would also do.



Sorry if it's a dull question, I'm pretty new to TikZ.










share|improve this question







New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • Welcome to TeX.SE! This is not at all a dumb question. Are you aware of this post, I guess that /tikz/node distance/.append code={...} does what you want. This allows you to store the distance in a key that you can use.

    – marmot
    7 hours ago














5












5








5








Is it possible to use the node distance as a variable while expressing coordinates of new nodes with Calc and Positioning libraries? What I want to have is everything within a single piece of code for tikz picture.



This is what I have now.



documentclass[12pt, a4paper]{article}
usepackage{tikz}
usetikzlibrary{automata, positioning, arrows,calc}

begin{document}
begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node distance=2cm,semithick,on grid]

tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
node[state,label=center:$a$,inner sep=0pt] (a) {};
node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:1cm) $) {};
node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:1cm)$) {};

path[->] (a) edge node {$1$} (b)
(c) edge node[right] {$1$} (b)
(b) edge [loop right] node[above] {$0,1$} (b);
path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

end{tikzpicture}
end{document}


I would like to be able to change the below expression with something like:



$(a) + sqrt(1/3)*2*(1:nodedistance)$


Then if I would be copying the code elsewhere, such as a presentations, I would be able to change all these distances at once. Is that possible? If not, introducing a variable in the first line of the TikZ code, and using it afterwards instead the "nodedistance", would also do.



Sorry if it's a dull question, I'm pretty new to TikZ.










share|improve this question







New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












Is it possible to use the node distance as a variable while expressing coordinates of new nodes with Calc and Positioning libraries? What I want to have is everything within a single piece of code for tikz picture.



This is what I have now.



documentclass[12pt, a4paper]{article}
usepackage{tikz}
usetikzlibrary{automata, positioning, arrows,calc}

begin{document}
begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node distance=2cm,semithick,on grid]

tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
node[state,label=center:$a$,inner sep=0pt] (a) {};
node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:1cm) $) {};
node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:1cm)$) {};

path[->] (a) edge node {$1$} (b)
(c) edge node[right] {$1$} (b)
(b) edge [loop right] node[above] {$0,1$} (b);
path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

end{tikzpicture}
end{document}


I would like to be able to change the below expression with something like:



$(a) + sqrt(1/3)*2*(1:nodedistance)$


Then if I would be copying the code elsewhere, such as a presentations, I would be able to change all these distances at once. Is that possible? If not, introducing a variable in the first line of the TikZ code, and using it afterwards instead the "nodedistance", would also do.



Sorry if it's a dull question, I'm pretty new to TikZ.







tikz-pgf positioning nodes calc






share|improve this question







New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question






New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 7 hours ago









garigari

262




262




New contributor




gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






gari is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.













  • Welcome to TeX.SE! This is not at all a dumb question. Are you aware of this post, I guess that /tikz/node distance/.append code={...} does what you want. This allows you to store the distance in a key that you can use.

    – marmot
    7 hours ago



















  • Welcome to TeX.SE! This is not at all a dumb question. Are you aware of this post, I guess that /tikz/node distance/.append code={...} does what you want. This allows you to store the distance in a key that you can use.

    – marmot
    7 hours ago

















Welcome to TeX.SE! This is not at all a dumb question. Are you aware of this post, I guess that /tikz/node distance/.append code={...} does what you want. This allows you to store the distance in a key that you can use.

– marmot
7 hours ago





Welcome to TeX.SE! This is not at all a dumb question. Are you aware of this post, I guess that /tikz/node distance/.append code={...} does what you want. This allows you to store the distance in a key that you can use.

– marmot
7 hours ago










2 Answers
2






active

oldest

votes


















3














AFAIK you cannot simply read off the value of /tikz/node distance. However, in this great answer by @Jake there is a simple way to amend node distance by a pgf key that you can use.



documentclass[12pt, a4paper]{article}
usepackage{tikz}
usetikzlibrary{automata, positioning, arrows,calc}
tikzset{node distance/.append code={
pgfkeyssetvalue{/tikz/node distance value}{#1}
}}
begin{document}
begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node
distance=2cm,semithick,on grid,
every state/.style={minimum size=20pt, fill=none,draw=black}]
node[state,label=center:$a$,inner sep=0pt] (a) {};
node[state,label=center:$b$] (b) at ($(a) + sqrt(4/3)*(0:pgfkeysvalueof{/tikz/node distance value}) $) {};
node[state,label=center:$c$] (c) at ($(a) + sqrt(4/3)*(-60:pgfkeysvalueof{/tikz/node distance value})$) {};

path[->] (a) edge node {$1$} (b)
(c) edge node[right] {$1$} (b)
(b) edge [loop right] node[above] {$0,1$} (b);
path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);
end{tikzpicture}
end{document}


enter image description here






share|improve this answer































    0














    You can create a macro defnodedistance{1cm} at the begining of the tikzpicture . Later if needed this macro could be redefined .



    documentclass[12pt, a4paper]{article}
    usepackage{tikz}
    usetikzlibrary{automata, positioning, arrows,calc}

    begin{document}
    begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

    defnodedistance{1cm} % <------------

    tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
    node[state,label=center:$a$,inner sep=0pt] (a) {};
    node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
    node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

    path[->] (a) edge node {$1$} (b)
    (c) edge node[right] {$1$} (b)
    (b) edge [loop right] node[above] {$0,1$} (b);
    path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

    end{tikzpicture}

    begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

    defnodedistance{2cm} % <----------------

    tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
    node[state,label=center:$a$,inner sep=0pt] (a) {};
    node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
    node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

    path[->] (a) edge node {$1$} (b)
    (c) edge node[right] {$1$} (b)
    (b) edge [loop right] node[above] {$0,1$} (b);
    path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

    end{tikzpicture}
    end{document}


    enter image description here






    share|improve this answer

























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      2 Answers
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      active

      oldest

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      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      3














      AFAIK you cannot simply read off the value of /tikz/node distance. However, in this great answer by @Jake there is a simple way to amend node distance by a pgf key that you can use.



      documentclass[12pt, a4paper]{article}
      usepackage{tikz}
      usetikzlibrary{automata, positioning, arrows,calc}
      tikzset{node distance/.append code={
      pgfkeyssetvalue{/tikz/node distance value}{#1}
      }}
      begin{document}
      begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node
      distance=2cm,semithick,on grid,
      every state/.style={minimum size=20pt, fill=none,draw=black}]
      node[state,label=center:$a$,inner sep=0pt] (a) {};
      node[state,label=center:$b$] (b) at ($(a) + sqrt(4/3)*(0:pgfkeysvalueof{/tikz/node distance value}) $) {};
      node[state,label=center:$c$] (c) at ($(a) + sqrt(4/3)*(-60:pgfkeysvalueof{/tikz/node distance value})$) {};

      path[->] (a) edge node {$1$} (b)
      (c) edge node[right] {$1$} (b)
      (b) edge [loop right] node[above] {$0,1$} (b);
      path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);
      end{tikzpicture}
      end{document}


      enter image description here






      share|improve this answer




























        3














        AFAIK you cannot simply read off the value of /tikz/node distance. However, in this great answer by @Jake there is a simple way to amend node distance by a pgf key that you can use.



        documentclass[12pt, a4paper]{article}
        usepackage{tikz}
        usetikzlibrary{automata, positioning, arrows,calc}
        tikzset{node distance/.append code={
        pgfkeyssetvalue{/tikz/node distance value}{#1}
        }}
        begin{document}
        begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node
        distance=2cm,semithick,on grid,
        every state/.style={minimum size=20pt, fill=none,draw=black}]
        node[state,label=center:$a$,inner sep=0pt] (a) {};
        node[state,label=center:$b$] (b) at ($(a) + sqrt(4/3)*(0:pgfkeysvalueof{/tikz/node distance value}) $) {};
        node[state,label=center:$c$] (c) at ($(a) + sqrt(4/3)*(-60:pgfkeysvalueof{/tikz/node distance value})$) {};

        path[->] (a) edge node {$1$} (b)
        (c) edge node[right] {$1$} (b)
        (b) edge [loop right] node[above] {$0,1$} (b);
        path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);
        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer


























          3












          3








          3







          AFAIK you cannot simply read off the value of /tikz/node distance. However, in this great answer by @Jake there is a simple way to amend node distance by a pgf key that you can use.



          documentclass[12pt, a4paper]{article}
          usepackage{tikz}
          usetikzlibrary{automata, positioning, arrows,calc}
          tikzset{node distance/.append code={
          pgfkeyssetvalue{/tikz/node distance value}{#1}
          }}
          begin{document}
          begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node
          distance=2cm,semithick,on grid,
          every state/.style={minimum size=20pt, fill=none,draw=black}]
          node[state,label=center:$a$,inner sep=0pt] (a) {};
          node[state,label=center:$b$] (b) at ($(a) + sqrt(4/3)*(0:pgfkeysvalueof{/tikz/node distance value}) $) {};
          node[state,label=center:$c$] (c) at ($(a) + sqrt(4/3)*(-60:pgfkeysvalueof{/tikz/node distance value})$) {};

          path[->] (a) edge node {$1$} (b)
          (c) edge node[right] {$1$} (b)
          (b) edge [loop right] node[above] {$0,1$} (b);
          path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);
          end{tikzpicture}
          end{document}


          enter image description here






          share|improve this answer













          AFAIK you cannot simply read off the value of /tikz/node distance. However, in this great answer by @Jake there is a simple way to amend node distance by a pgf key that you can use.



          documentclass[12pt, a4paper]{article}
          usepackage{tikz}
          usetikzlibrary{automata, positioning, arrows,calc}
          tikzset{node distance/.append code={
          pgfkeyssetvalue{/tikz/node distance value}{#1}
          }}
          begin{document}
          begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,node
          distance=2cm,semithick,on grid,
          every state/.style={minimum size=20pt, fill=none,draw=black}]
          node[state,label=center:$a$,inner sep=0pt] (a) {};
          node[state,label=center:$b$] (b) at ($(a) + sqrt(4/3)*(0:pgfkeysvalueof{/tikz/node distance value}) $) {};
          node[state,label=center:$c$] (c) at ($(a) + sqrt(4/3)*(-60:pgfkeysvalueof{/tikz/node distance value})$) {};

          path[->] (a) edge node {$1$} (b)
          (c) edge node[right] {$1$} (b)
          (b) edge [loop right] node[above] {$0,1$} (b);
          path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);
          end{tikzpicture}
          end{document}


          enter image description here







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 6 hours ago









          marmotmarmot

          96.7k4111213




          96.7k4111213























              0














              You can create a macro defnodedistance{1cm} at the begining of the tikzpicture . Later if needed this macro could be redefined .



              documentclass[12pt, a4paper]{article}
              usepackage{tikz}
              usetikzlibrary{automata, positioning, arrows,calc}

              begin{document}
              begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

              defnodedistance{1cm} % <------------

              tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
              node[state,label=center:$a$,inner sep=0pt] (a) {};
              node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
              node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

              path[->] (a) edge node {$1$} (b)
              (c) edge node[right] {$1$} (b)
              (b) edge [loop right] node[above] {$0,1$} (b);
              path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

              end{tikzpicture}

              begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

              defnodedistance{2cm} % <----------------

              tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
              node[state,label=center:$a$,inner sep=0pt] (a) {};
              node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
              node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

              path[->] (a) edge node {$1$} (b)
              (c) edge node[right] {$1$} (b)
              (b) edge [loop right] node[above] {$0,1$} (b);
              path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

              end{tikzpicture}
              end{document}


              enter image description here






              share|improve this answer






























                0














                You can create a macro defnodedistance{1cm} at the begining of the tikzpicture . Later if needed this macro could be redefined .



                documentclass[12pt, a4paper]{article}
                usepackage{tikz}
                usetikzlibrary{automata, positioning, arrows,calc}

                begin{document}
                begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

                defnodedistance{1cm} % <------------

                tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
                node[state,label=center:$a$,inner sep=0pt] (a) {};
                node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
                node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

                path[->] (a) edge node {$1$} (b)
                (c) edge node[right] {$1$} (b)
                (b) edge [loop right] node[above] {$0,1$} (b);
                path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

                end{tikzpicture}

                begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

                defnodedistance{2cm} % <----------------

                tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
                node[state,label=center:$a$,inner sep=0pt] (a) {};
                node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
                node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

                path[->] (a) edge node {$1$} (b)
                (c) edge node[right] {$1$} (b)
                (b) edge [loop right] node[above] {$0,1$} (b);
                path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

                end{tikzpicture}
                end{document}


                enter image description here






                share|improve this answer




























                  0












                  0








                  0







                  You can create a macro defnodedistance{1cm} at the begining of the tikzpicture . Later if needed this macro could be redefined .



                  documentclass[12pt, a4paper]{article}
                  usepackage{tikz}
                  usetikzlibrary{automata, positioning, arrows,calc}

                  begin{document}
                  begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

                  defnodedistance{1cm} % <------------

                  tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
                  node[state,label=center:$a$,inner sep=0pt] (a) {};
                  node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
                  node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

                  path[->] (a) edge node {$1$} (b)
                  (c) edge node[right] {$1$} (b)
                  (b) edge [loop right] node[above] {$0,1$} (b);
                  path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

                  end{tikzpicture}

                  begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

                  defnodedistance{2cm} % <----------------

                  tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
                  node[state,label=center:$a$,inner sep=0pt] (a) {};
                  node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
                  node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

                  path[->] (a) edge node {$1$} (b)
                  (c) edge node[right] {$1$} (b)
                  (b) edge [loop right] node[above] {$0,1$} (b);
                  path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

                  end{tikzpicture}
                  end{document}


                  enter image description here






                  share|improve this answer















                  You can create a macro defnodedistance{1cm} at the begining of the tikzpicture . Later if needed this macro could be redefined .



                  documentclass[12pt, a4paper]{article}
                  usepackage{tikz}
                  usetikzlibrary{automata, positioning, arrows,calc}

                  begin{document}
                  begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

                  defnodedistance{1cm} % <------------

                  tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
                  node[state,label=center:$a$,inner sep=0pt] (a) {};
                  node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
                  node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

                  path[->] (a) edge node {$1$} (b)
                  (c) edge node[right] {$1$} (b)
                  (b) edge [loop right] node[above] {$0,1$} (b);
                  path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

                  end{tikzpicture}

                  begin{tikzpicture}[>=stealth',shorten >=0.5pt,auto,semithick,on grid]

                  defnodedistance{2cm} % <----------------

                  tikzstyle{every state}=[minimum size=20pt, fill=none,draw=black]
                  node[state,label=center:$a$,inner sep=0pt] (a) {};
                  node[state,label=center:$b$] (b) at ($(a) + sqrt(1/3)*4*(0:nodedistance) $) {};
                  node[state,label=center:$c$] (c) at ($(a) + sqrt(1/3)*4*(-60:nodedistance)$) {};

                  path[->] (a) edge node {$1$} (b)
                  (c) edge node[right] {$1$} (b)
                  (b) edge [loop right] node[above] {$0,1$} (b);
                  path[shorten <=0.5pt,<->] (a) edge node[left]{$0$} (c);

                  end{tikzpicture}
                  end{document}


                  enter image description here







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                  edited 24 mins ago

























                  answered 32 mins ago









                  Hafid BoukhouldaHafid Boukhoulda

                  2,9271520




                  2,9271520






















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