TikZ - Remove space around nodes











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down vote

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I'm relatively new to TikZ and I drew the following graph. However, there is some space around the filled black node. Is there a way to have the lines actually connecting with the node?



EDIT: I'm not sure why it doesn't compile and show the graph in here? Maybe someone could please help me with this?



documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node (7) at (1.5,1.5) {};
node (2) at (2.6, 2.2) [circle,draw] {2};

fill (7) circle (2.5pt);

draw[-] (1) to (7);
draw[-] (4) to (7);
draw[-] (3) to (7);
draw[-] (2) to (7);

end{tikzpicture}
end{document}


enter image description here










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  • 2




    Welcome to TeX.SX! The code you upload here doesn't get compiled automatically. What you can do is upload a picture of the results yourself. You'll have to convert the pdf to something else (png or jpeg should be fine).
    – Skillmon
    Nov 16 at 8:55










  • Thank you! I've added a picture for the sake of completeness.
    – SallyOwens
    Nov 16 at 9:14















up vote
10
down vote

favorite
1












I'm relatively new to TikZ and I drew the following graph. However, there is some space around the filled black node. Is there a way to have the lines actually connecting with the node?



EDIT: I'm not sure why it doesn't compile and show the graph in here? Maybe someone could please help me with this?



documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node (7) at (1.5,1.5) {};
node (2) at (2.6, 2.2) [circle,draw] {2};

fill (7) circle (2.5pt);

draw[-] (1) to (7);
draw[-] (4) to (7);
draw[-] (3) to (7);
draw[-] (2) to (7);

end{tikzpicture}
end{document}


enter image description here










share|improve this question









New contributor




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
















  • 2




    Welcome to TeX.SX! The code you upload here doesn't get compiled automatically. What you can do is upload a picture of the results yourself. You'll have to convert the pdf to something else (png or jpeg should be fine).
    – Skillmon
    Nov 16 at 8:55










  • Thank you! I've added a picture for the sake of completeness.
    – SallyOwens
    Nov 16 at 9:14













up vote
10
down vote

favorite
1









up vote
10
down vote

favorite
1






1





I'm relatively new to TikZ and I drew the following graph. However, there is some space around the filled black node. Is there a way to have the lines actually connecting with the node?



EDIT: I'm not sure why it doesn't compile and show the graph in here? Maybe someone could please help me with this?



documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node (7) at (1.5,1.5) {};
node (2) at (2.6, 2.2) [circle,draw] {2};

fill (7) circle (2.5pt);

draw[-] (1) to (7);
draw[-] (4) to (7);
draw[-] (3) to (7);
draw[-] (2) to (7);

end{tikzpicture}
end{document}


enter image description here










share|improve this question









New contributor




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











I'm relatively new to TikZ and I drew the following graph. However, there is some space around the filled black node. Is there a way to have the lines actually connecting with the node?



EDIT: I'm not sure why it doesn't compile and show the graph in here? Maybe someone could please help me with this?



documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node (7) at (1.5,1.5) {};
node (2) at (2.6, 2.2) [circle,draw] {2};

fill (7) circle (2.5pt);

draw[-] (1) to (7);
draw[-] (4) to (7);
draw[-] (3) to (7);
draw[-] (2) to (7);

end{tikzpicture}
end{document}


enter image description here







tikz-pgf






share|improve this question









New contributor




SallyOwens 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









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Check out our Code of Conduct.









share|improve this question




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edited Nov 16 at 9:14





















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asked Nov 16 at 8:43









SallyOwens

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1535




New contributor




SallyOwens is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor





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






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








  • 2




    Welcome to TeX.SX! The code you upload here doesn't get compiled automatically. What you can do is upload a picture of the results yourself. You'll have to convert the pdf to something else (png or jpeg should be fine).
    – Skillmon
    Nov 16 at 8:55










  • Thank you! I've added a picture for the sake of completeness.
    – SallyOwens
    Nov 16 at 9:14














  • 2




    Welcome to TeX.SX! The code you upload here doesn't get compiled automatically. What you can do is upload a picture of the results yourself. You'll have to convert the pdf to something else (png or jpeg should be fine).
    – Skillmon
    Nov 16 at 8:55










  • Thank you! I've added a picture for the sake of completeness.
    – SallyOwens
    Nov 16 at 9:14








2




2




Welcome to TeX.SX! The code you upload here doesn't get compiled automatically. What you can do is upload a picture of the results yourself. You'll have to convert the pdf to something else (png or jpeg should be fine).
– Skillmon
Nov 16 at 8:55




Welcome to TeX.SX! The code you upload here doesn't get compiled automatically. What you can do is upload a picture of the results yourself. You'll have to convert the pdf to something else (png or jpeg should be fine).
– Skillmon
Nov 16 at 8:55












Thank you! I've added a picture for the sake of completeness.
– SallyOwens
Nov 16 at 9:14




Thank you! I've added a picture for the sake of completeness.
– SallyOwens
Nov 16 at 9:14










7 Answers
7






active

oldest

votes

















up vote
11
down vote



accepted










You can control the space added with the inner sep key:



documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node[inner sep=0pt] (7) at (1.5,1.5) {};
node (2) at (2.6, 2.2) [circle,draw] {2};

fill (7) circle (2.5pt);

draw[-] (1) to (7);
draw[-] (4) to (7);
draw[-] (3) to (7);
draw[-] (2) to (7);

end{tikzpicture}
end{document}


enter image description here






share|improve this answer





















  • Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
    – SallyOwens
    Nov 16 at 9:26








  • 1




    @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
    – Skillmon
    Nov 16 at 9:28










  • Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
    – SallyOwens
    Nov 16 at 9:29


















up vote
6
down vote













You are already using circular node shapes, so why not here? And you can put the filled circle in the middle with barycentric cs: (but since you are naming the ones 1, 2, 3, 4, the syntax is here a bit amusing, which is the main reason why I am posting this ;-). And foreach can make your life easier.



documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node (2) at (2.6, 2.2) [circle,draw] {2};
node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=1,3=1,4=1) {};

foreach X in {1,...,4}
{draw[-] (X) to (7);}

end{tikzpicture}
end{document}


enter image description here






share|improve this answer

















  • 1




    +1 for barycentric coordinates. it is very, very rare visible here :-)
    – Zarko
    Nov 16 at 15:23










  • @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
    – marmot
    Nov 16 at 15:25






  • 1




    This question draws the attention of all TikZ association stakeholders.
    – Diaa
    Nov 16 at 18:04


















up vote
5
down vote













documentclass{article}
usepackage{tikz}
begin{document}
begin{tikzpicture}[scale=0.8]
node (1) at (0.4, 2.2) [circle,draw] {1};
node (4) at (0.4, 0.6) [circle,draw] {4};
node (3) at (2.6, 0.6) [circle,draw] {3};
node (7) at (1.5,1.5) {};
node (2) at (2.6, 2.2) [circle,draw] {2};

node[circle, fill=black, draw=black, minimum size=2.5pt] (7) at (1.5, 1.4) {};

draw[-] (1) to (7);
draw[-] (4) to (7);
draw[-] (3) to (7);
draw[-] (2) to (7);

end{tikzpicture}
end{document}


You forgot begin{document} and you should use a node for the circle as well, where you specify the size and color in the node properties.






share|improve this answer





















  • For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
    – Ignasi
    Nov 16 at 10:59












  • Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
    – Ignasi
    Nov 16 at 11:01


















up vote
3
down vote













using polar coordinates and foreach loop make your code simpler and shorter ...



documentclass[tikz, margin=3.141592mm]{standalone}

begin{document}
begin{tikzpicture}[scale=0.8,
circ/.style = {circle, draw},
dot/.style = {circle, fill, inner sep=2.5pt}
]
node (n7) [dot] {};
foreach i [count=ii] in {135, 45, 315, 225}
node (ii) [circ] at (i:16mm) {ii};
draw (1) -- (3) (2) -- (4);
end{tikzpicture}
end{document}


enter image description here






share|improve this answer




























    up vote
    2
    down vote













    I would like to join the celebration by offering an additional solution!



    The middle node (7) is defined when drawing the first diagonal (1)--(3).



    draw (1) -- (3) node [midway,fill] (7){};


    I also factorized the style applied to the nodes with the key every node/.style={circle,draw}



    capture



    documentclass{article}
    usepackage{tikz}
    begin{document}
    begin{tikzpicture}[scale=0.8,every node/.style={circle,draw}]]
    node (1) at (0.4, 2.2) {1};
    node (4) at (0.4, 0.6) {4};
    node (3) at (2.6, 0.6) {3};
    node (2) at (2.6, 2.2) {2};
    draw (1) -- (3) node [midway,fill] (7){};
    draw (2) to (7)to (4);
    end{tikzpicture}
    end{document}





    share|improve this answer

















    • 1




      +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
      – Sigur
      Nov 16 at 17:49


















    up vote
    2
    down vote













    You can write draw (1)--(7.center).
    enter image description here



    documentclass[tikz,border=2mm]{standalone}
    begin{document}
    begin{tikzpicture}
    node (1) at (0.4, 2.2) [circle,draw] {1};
    node (4) at (0.4, 0.6) [circle,draw] {4};
    node (3) at (2.6, 0.6) [circle,draw] {3};
    node (7) at (1.5,1.5) {};
    node (2) at (2.6, 2.2) [circle,draw] {2};

    fill (7) circle (2.5pt);

    draw (1) to (7.center);
    draw (4) to (7.center);
    draw (3) to (7.center);
    draw (2) to (7.center);
    end{tikzpicture}
    end{document}





    share|improve this answer






























      up vote
      2
      down vote













      You can define (7) as coordinate instead of node to solve this.



      documentclass[tikz,border=2mm]{standalone}
      begin{document}
      begin{tikzpicture}
      node (1) at (0.4, 2.2) [circle,draw] {1};
      node (4) at (0.4, 0.6) [circle,draw] {4};
      node (3) at (2.6, 0.6) [circle,draw] {3};
      coordinate (7) at (1.5,1.5) {};
      node (2) at (2.6, 2.2) [circle,draw] {2};

      fill (7) circle (2.5pt);

      draw (1) to (7);
      draw (4) to (7);
      draw (3) to (7);
      draw (2) to (7);
      end{tikzpicture}
      end{document}


      enter image description here






      share|improve this answer





















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        7 Answers
        7






        active

        oldest

        votes








        7 Answers
        7






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes








        up vote
        11
        down vote



        accepted










        You can control the space added with the inner sep key:



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node[inner sep=0pt] (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        fill (7) circle (2.5pt);

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer





















        • Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
          – SallyOwens
          Nov 16 at 9:26








        • 1




          @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
          – Skillmon
          Nov 16 at 9:28










        • Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
          – SallyOwens
          Nov 16 at 9:29















        up vote
        11
        down vote



        accepted










        You can control the space added with the inner sep key:



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node[inner sep=0pt] (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        fill (7) circle (2.5pt);

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer





















        • Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
          – SallyOwens
          Nov 16 at 9:26








        • 1




          @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
          – Skillmon
          Nov 16 at 9:28










        • Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
          – SallyOwens
          Nov 16 at 9:29













        up vote
        11
        down vote



        accepted







        up vote
        11
        down vote



        accepted






        You can control the space added with the inner sep key:



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node[inner sep=0pt] (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        fill (7) circle (2.5pt);

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer












        You can control the space added with the inner sep key:



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node[inner sep=0pt] (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        fill (7) circle (2.5pt);

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        enter image description here







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 16 at 8:58









        Skillmon

        20.2k11840




        20.2k11840












        • Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
          – SallyOwens
          Nov 16 at 9:26








        • 1




          @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
          – Skillmon
          Nov 16 at 9:28










        • Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
          – SallyOwens
          Nov 16 at 9:29


















        • Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
          – SallyOwens
          Nov 16 at 9:26








        • 1




          @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
          – Skillmon
          Nov 16 at 9:28










        • Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
          – SallyOwens
          Nov 16 at 9:29
















        Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
        – SallyOwens
        Nov 16 at 9:26






        Thank you. I also have another graph as the one above only that there are two black nodes and a line in the middle. If I add [inner sep=0pt] as you suggested to both nodes, the middle line however appears to be darker than the rest - is there a way to prevent this?
        – SallyOwens
        Nov 16 at 9:26






        1




        1




        @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
        – Skillmon
        Nov 16 at 9:28




        @SallyOwens that might be a problem of the rendering of your PDF viewer. You could try to zoom in more on that line to really check that. Or use another viewer (xpdf is known to be very precise in rendering).
        – Skillmon
        Nov 16 at 9:28












        Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
        – SallyOwens
        Nov 16 at 9:29




        Thank you - this migth be the problem. When zooming in, they all appear equally dark/bold :) I just wanted to check that it is no a problem caused by my code.
        – SallyOwens
        Nov 16 at 9:29










        up vote
        6
        down vote













        You are already using circular node shapes, so why not here? And you can put the filled circle in the middle with barycentric cs: (but since you are naming the ones 1, 2, 3, 4, the syntax is here a bit amusing, which is the main reason why I am posting this ;-). And foreach can make your life easier.



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (2) at (2.6, 2.2) [circle,draw] {2};
        node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=1,3=1,4=1) {};

        foreach X in {1,...,4}
        {draw[-] (X) to (7);}

        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer

















        • 1




          +1 for barycentric coordinates. it is very, very rare visible here :-)
          – Zarko
          Nov 16 at 15:23










        • @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
          – marmot
          Nov 16 at 15:25






        • 1




          This question draws the attention of all TikZ association stakeholders.
          – Diaa
          Nov 16 at 18:04















        up vote
        6
        down vote













        You are already using circular node shapes, so why not here? And you can put the filled circle in the middle with barycentric cs: (but since you are naming the ones 1, 2, 3, 4, the syntax is here a bit amusing, which is the main reason why I am posting this ;-). And foreach can make your life easier.



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (2) at (2.6, 2.2) [circle,draw] {2};
        node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=1,3=1,4=1) {};

        foreach X in {1,...,4}
        {draw[-] (X) to (7);}

        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer

















        • 1




          +1 for barycentric coordinates. it is very, very rare visible here :-)
          – Zarko
          Nov 16 at 15:23










        • @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
          – marmot
          Nov 16 at 15:25






        • 1




          This question draws the attention of all TikZ association stakeholders.
          – Diaa
          Nov 16 at 18:04













        up vote
        6
        down vote










        up vote
        6
        down vote









        You are already using circular node shapes, so why not here? And you can put the filled circle in the middle with barycentric cs: (but since you are naming the ones 1, 2, 3, 4, the syntax is here a bit amusing, which is the main reason why I am posting this ;-). And foreach can make your life easier.



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (2) at (2.6, 2.2) [circle,draw] {2};
        node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=1,3=1,4=1) {};

        foreach X in {1,...,4}
        {draw[-] (X) to (7);}

        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer












        You are already using circular node shapes, so why not here? And you can put the filled circle in the middle with barycentric cs: (but since you are naming the ones 1, 2, 3, 4, the syntax is here a bit amusing, which is the main reason why I am posting this ;-). And foreach can make your life easier.



        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (2) at (2.6, 2.2) [circle,draw] {2};
        node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=1,3=1,4=1) {};

        foreach X in {1,...,4}
        {draw[-] (X) to (7);}

        end{tikzpicture}
        end{document}


        enter image description here







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 16 at 14:33









        marmot

        76.3k486160




        76.3k486160








        • 1




          +1 for barycentric coordinates. it is very, very rare visible here :-)
          – Zarko
          Nov 16 at 15:23










        • @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
          – marmot
          Nov 16 at 15:25






        • 1




          This question draws the attention of all TikZ association stakeholders.
          – Diaa
          Nov 16 at 18:04














        • 1




          +1 for barycentric coordinates. it is very, very rare visible here :-)
          – Zarko
          Nov 16 at 15:23










        • @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
          – marmot
          Nov 16 at 15:25






        • 1




          This question draws the attention of all TikZ association stakeholders.
          – Diaa
          Nov 16 at 18:04








        1




        1




        +1 for barycentric coordinates. it is very, very rare visible here :-)
        – Zarko
        Nov 16 at 15:23




        +1 for barycentric coordinates. it is very, very rare visible here :-)
        – Zarko
        Nov 16 at 15:23












        @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
        – marmot
        Nov 16 at 15:25




        @Zarko Thanks! (I actually posted it because of 2=1. If one would use node[inner sep=2.5pt,circle,fill] (7) at (barycentric cs:1=1,2=2,3=3,4=4) {}; instead, it wouldn't work. ;-)
        – marmot
        Nov 16 at 15:25




        1




        1




        This question draws the attention of all TikZ association stakeholders.
        – Diaa
        Nov 16 at 18:04




        This question draws the attention of all TikZ association stakeholders.
        – Diaa
        Nov 16 at 18:04










        up vote
        5
        down vote













        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        node[circle, fill=black, draw=black, minimum size=2.5pt] (7) at (1.5, 1.4) {};

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        You forgot begin{document} and you should use a node for the circle as well, where you specify the size and color in the node properties.






        share|improve this answer





















        • For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 10:59












        • Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 11:01















        up vote
        5
        down vote













        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        node[circle, fill=black, draw=black, minimum size=2.5pt] (7) at (1.5, 1.4) {};

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        You forgot begin{document} and you should use a node for the circle as well, where you specify the size and color in the node properties.






        share|improve this answer





















        • For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 10:59












        • Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 11:01













        up vote
        5
        down vote










        up vote
        5
        down vote









        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        node[circle, fill=black, draw=black, minimum size=2.5pt] (7) at (1.5, 1.4) {};

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        You forgot begin{document} and you should use a node for the circle as well, where you specify the size and color in the node properties.






        share|improve this answer












        documentclass{article}
        usepackage{tikz}
        begin{document}
        begin{tikzpicture}[scale=0.8]
        node (1) at (0.4, 2.2) [circle,draw] {1};
        node (4) at (0.4, 0.6) [circle,draw] {4};
        node (3) at (2.6, 0.6) [circle,draw] {3};
        node (7) at (1.5,1.5) {};
        node (2) at (2.6, 2.2) [circle,draw] {2};

        node[circle, fill=black, draw=black, minimum size=2.5pt] (7) at (1.5, 1.4) {};

        draw[-] (1) to (7);
        draw[-] (4) to (7);
        draw[-] (3) to (7);
        draw[-] (2) to (7);

        end{tikzpicture}
        end{document}


        You forgot begin{document} and you should use a node for the circle as well, where you specify the size and color in the node properties.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 16 at 9:02









        Labello

        1764




        1764












        • For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 10:59












        • Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 11:01


















        • For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 10:59












        • Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
          – Ignasi
          Nov 16 at 11:01
















        For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
        – Ignasi
        Nov 16 at 10:59






        For an equivalent to circle(2.5pt), minimum size should be 5pt. And you need to fix inner sep=0pt otherwise default inner sep makes a node larger than 5pt. Finally, outer sep=0pt is needed to avoid a little gap between lines and central node. node[circle, fill=black, minimum size=5pt, inner sep=0pt, outer sep=0pt] (7) at (1.5,1.5) {};
        – Ignasi
        Nov 16 at 10:59














        Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
        – Ignasi
        Nov 16 at 11:01




        Ups sorry, if you also draw the node, outer sep=0pt is not needed. node[circle, draw, fill=black, minimum size=5pt, inner sep=0pt] (7) at (1.5,1.5) {};
        – Ignasi
        Nov 16 at 11:01










        up vote
        3
        down vote













        using polar coordinates and foreach loop make your code simpler and shorter ...



        documentclass[tikz, margin=3.141592mm]{standalone}

        begin{document}
        begin{tikzpicture}[scale=0.8,
        circ/.style = {circle, draw},
        dot/.style = {circle, fill, inner sep=2.5pt}
        ]
        node (n7) [dot] {};
        foreach i [count=ii] in {135, 45, 315, 225}
        node (ii) [circ] at (i:16mm) {ii};
        draw (1) -- (3) (2) -- (4);
        end{tikzpicture}
        end{document}


        enter image description here






        share|improve this answer

























          up vote
          3
          down vote













          using polar coordinates and foreach loop make your code simpler and shorter ...



          documentclass[tikz, margin=3.141592mm]{standalone}

          begin{document}
          begin{tikzpicture}[scale=0.8,
          circ/.style = {circle, draw},
          dot/.style = {circle, fill, inner sep=2.5pt}
          ]
          node (n7) [dot] {};
          foreach i [count=ii] in {135, 45, 315, 225}
          node (ii) [circ] at (i:16mm) {ii};
          draw (1) -- (3) (2) -- (4);
          end{tikzpicture}
          end{document}


          enter image description here






          share|improve this answer























            up vote
            3
            down vote










            up vote
            3
            down vote









            using polar coordinates and foreach loop make your code simpler and shorter ...



            documentclass[tikz, margin=3.141592mm]{standalone}

            begin{document}
            begin{tikzpicture}[scale=0.8,
            circ/.style = {circle, draw},
            dot/.style = {circle, fill, inner sep=2.5pt}
            ]
            node (n7) [dot] {};
            foreach i [count=ii] in {135, 45, 315, 225}
            node (ii) [circ] at (i:16mm) {ii};
            draw (1) -- (3) (2) -- (4);
            end{tikzpicture}
            end{document}


            enter image description here






            share|improve this answer












            using polar coordinates and foreach loop make your code simpler and shorter ...



            documentclass[tikz, margin=3.141592mm]{standalone}

            begin{document}
            begin{tikzpicture}[scale=0.8,
            circ/.style = {circle, draw},
            dot/.style = {circle, fill, inner sep=2.5pt}
            ]
            node (n7) [dot] {};
            foreach i [count=ii] in {135, 45, 315, 225}
            node (ii) [circ] at (i:16mm) {ii};
            draw (1) -- (3) (2) -- (4);
            end{tikzpicture}
            end{document}


            enter image description here







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 16 at 15:22









            Zarko

            116k865154




            116k865154






















                up vote
                2
                down vote













                I would like to join the celebration by offering an additional solution!



                The middle node (7) is defined when drawing the first diagonal (1)--(3).



                draw (1) -- (3) node [midway,fill] (7){};


                I also factorized the style applied to the nodes with the key every node/.style={circle,draw}



                capture



                documentclass{article}
                usepackage{tikz}
                begin{document}
                begin{tikzpicture}[scale=0.8,every node/.style={circle,draw}]]
                node (1) at (0.4, 2.2) {1};
                node (4) at (0.4, 0.6) {4};
                node (3) at (2.6, 0.6) {3};
                node (2) at (2.6, 2.2) {2};
                draw (1) -- (3) node [midway,fill] (7){};
                draw (2) to (7)to (4);
                end{tikzpicture}
                end{document}





                share|improve this answer

















                • 1




                  +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
                  – Sigur
                  Nov 16 at 17:49















                up vote
                2
                down vote













                I would like to join the celebration by offering an additional solution!



                The middle node (7) is defined when drawing the first diagonal (1)--(3).



                draw (1) -- (3) node [midway,fill] (7){};


                I also factorized the style applied to the nodes with the key every node/.style={circle,draw}



                capture



                documentclass{article}
                usepackage{tikz}
                begin{document}
                begin{tikzpicture}[scale=0.8,every node/.style={circle,draw}]]
                node (1) at (0.4, 2.2) {1};
                node (4) at (0.4, 0.6) {4};
                node (3) at (2.6, 0.6) {3};
                node (2) at (2.6, 2.2) {2};
                draw (1) -- (3) node [midway,fill] (7){};
                draw (2) to (7)to (4);
                end{tikzpicture}
                end{document}





                share|improve this answer

















                • 1




                  +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
                  – Sigur
                  Nov 16 at 17:49













                up vote
                2
                down vote










                up vote
                2
                down vote









                I would like to join the celebration by offering an additional solution!



                The middle node (7) is defined when drawing the first diagonal (1)--(3).



                draw (1) -- (3) node [midway,fill] (7){};


                I also factorized the style applied to the nodes with the key every node/.style={circle,draw}



                capture



                documentclass{article}
                usepackage{tikz}
                begin{document}
                begin{tikzpicture}[scale=0.8,every node/.style={circle,draw}]]
                node (1) at (0.4, 2.2) {1};
                node (4) at (0.4, 0.6) {4};
                node (3) at (2.6, 0.6) {3};
                node (2) at (2.6, 2.2) {2};
                draw (1) -- (3) node [midway,fill] (7){};
                draw (2) to (7)to (4);
                end{tikzpicture}
                end{document}





                share|improve this answer












                I would like to join the celebration by offering an additional solution!



                The middle node (7) is defined when drawing the first diagonal (1)--(3).



                draw (1) -- (3) node [midway,fill] (7){};


                I also factorized the style applied to the nodes with the key every node/.style={circle,draw}



                capture



                documentclass{article}
                usepackage{tikz}
                begin{document}
                begin{tikzpicture}[scale=0.8,every node/.style={circle,draw}]]
                node (1) at (0.4, 2.2) {1};
                node (4) at (0.4, 0.6) {4};
                node (3) at (2.6, 0.6) {3};
                node (2) at (2.6, 2.2) {2};
                draw (1) -- (3) node [midway,fill] (7){};
                draw (2) to (7)to (4);
                end{tikzpicture}
                end{document}






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 16 at 15:37









                AndréC

                5,7921937




                5,7921937








                • 1




                  +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
                  – Sigur
                  Nov 16 at 17:49














                • 1




                  +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
                  – Sigur
                  Nov 16 at 17:49








                1




                1




                +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
                – Sigur
                Nov 16 at 17:49




                +1 since the 4 edges are aligned, that is, 3 nodes are colinear.
                – Sigur
                Nov 16 at 17:49










                up vote
                2
                down vote













                You can write draw (1)--(7.center).
                enter image description here



                documentclass[tikz,border=2mm]{standalone}
                begin{document}
                begin{tikzpicture}
                node (1) at (0.4, 2.2) [circle,draw] {1};
                node (4) at (0.4, 0.6) [circle,draw] {4};
                node (3) at (2.6, 0.6) [circle,draw] {3};
                node (7) at (1.5,1.5) {};
                node (2) at (2.6, 2.2) [circle,draw] {2};

                fill (7) circle (2.5pt);

                draw (1) to (7.center);
                draw (4) to (7.center);
                draw (3) to (7.center);
                draw (2) to (7.center);
                end{tikzpicture}
                end{document}





                share|improve this answer



























                  up vote
                  2
                  down vote













                  You can write draw (1)--(7.center).
                  enter image description here



                  documentclass[tikz,border=2mm]{standalone}
                  begin{document}
                  begin{tikzpicture}
                  node (1) at (0.4, 2.2) [circle,draw] {1};
                  node (4) at (0.4, 0.6) [circle,draw] {4};
                  node (3) at (2.6, 0.6) [circle,draw] {3};
                  node (7) at (1.5,1.5) {};
                  node (2) at (2.6, 2.2) [circle,draw] {2};

                  fill (7) circle (2.5pt);

                  draw (1) to (7.center);
                  draw (4) to (7.center);
                  draw (3) to (7.center);
                  draw (2) to (7.center);
                  end{tikzpicture}
                  end{document}





                  share|improve this answer

























                    up vote
                    2
                    down vote










                    up vote
                    2
                    down vote









                    You can write draw (1)--(7.center).
                    enter image description here



                    documentclass[tikz,border=2mm]{standalone}
                    begin{document}
                    begin{tikzpicture}
                    node (1) at (0.4, 2.2) [circle,draw] {1};
                    node (4) at (0.4, 0.6) [circle,draw] {4};
                    node (3) at (2.6, 0.6) [circle,draw] {3};
                    node (7) at (1.5,1.5) {};
                    node (2) at (2.6, 2.2) [circle,draw] {2};

                    fill (7) circle (2.5pt);

                    draw (1) to (7.center);
                    draw (4) to (7.center);
                    draw (3) to (7.center);
                    draw (2) to (7.center);
                    end{tikzpicture}
                    end{document}





                    share|improve this answer














                    You can write draw (1)--(7.center).
                    enter image description here



                    documentclass[tikz,border=2mm]{standalone}
                    begin{document}
                    begin{tikzpicture}
                    node (1) at (0.4, 2.2) [circle,draw] {1};
                    node (4) at (0.4, 0.6) [circle,draw] {4};
                    node (3) at (2.6, 0.6) [circle,draw] {3};
                    node (7) at (1.5,1.5) {};
                    node (2) at (2.6, 2.2) [circle,draw] {2};

                    fill (7) circle (2.5pt);

                    draw (1) to (7.center);
                    draw (4) to (7.center);
                    draw (3) to (7.center);
                    draw (2) to (7.center);
                    end{tikzpicture}
                    end{document}






                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited Nov 16 at 17:47









                    Sigur

                    23.1k353134




                    23.1k353134










                    answered Nov 16 at 17:06









                    Black Mild

                    476311




                    476311






















                        up vote
                        2
                        down vote













                        You can define (7) as coordinate instead of node to solve this.



                        documentclass[tikz,border=2mm]{standalone}
                        begin{document}
                        begin{tikzpicture}
                        node (1) at (0.4, 2.2) [circle,draw] {1};
                        node (4) at (0.4, 0.6) [circle,draw] {4};
                        node (3) at (2.6, 0.6) [circle,draw] {3};
                        coordinate (7) at (1.5,1.5) {};
                        node (2) at (2.6, 2.2) [circle,draw] {2};

                        fill (7) circle (2.5pt);

                        draw (1) to (7);
                        draw (4) to (7);
                        draw (3) to (7);
                        draw (2) to (7);
                        end{tikzpicture}
                        end{document}


                        enter image description here






                        share|improve this answer

























                          up vote
                          2
                          down vote













                          You can define (7) as coordinate instead of node to solve this.



                          documentclass[tikz,border=2mm]{standalone}
                          begin{document}
                          begin{tikzpicture}
                          node (1) at (0.4, 2.2) [circle,draw] {1};
                          node (4) at (0.4, 0.6) [circle,draw] {4};
                          node (3) at (2.6, 0.6) [circle,draw] {3};
                          coordinate (7) at (1.5,1.5) {};
                          node (2) at (2.6, 2.2) [circle,draw] {2};

                          fill (7) circle (2.5pt);

                          draw (1) to (7);
                          draw (4) to (7);
                          draw (3) to (7);
                          draw (2) to (7);
                          end{tikzpicture}
                          end{document}


                          enter image description here






                          share|improve this answer























                            up vote
                            2
                            down vote










                            up vote
                            2
                            down vote









                            You can define (7) as coordinate instead of node to solve this.



                            documentclass[tikz,border=2mm]{standalone}
                            begin{document}
                            begin{tikzpicture}
                            node (1) at (0.4, 2.2) [circle,draw] {1};
                            node (4) at (0.4, 0.6) [circle,draw] {4};
                            node (3) at (2.6, 0.6) [circle,draw] {3};
                            coordinate (7) at (1.5,1.5) {};
                            node (2) at (2.6, 2.2) [circle,draw] {2};

                            fill (7) circle (2.5pt);

                            draw (1) to (7);
                            draw (4) to (7);
                            draw (3) to (7);
                            draw (2) to (7);
                            end{tikzpicture}
                            end{document}


                            enter image description here






                            share|improve this answer












                            You can define (7) as coordinate instead of node to solve this.



                            documentclass[tikz,border=2mm]{standalone}
                            begin{document}
                            begin{tikzpicture}
                            node (1) at (0.4, 2.2) [circle,draw] {1};
                            node (4) at (0.4, 0.6) [circle,draw] {4};
                            node (3) at (2.6, 0.6) [circle,draw] {3};
                            coordinate (7) at (1.5,1.5) {};
                            node (2) at (2.6, 2.2) [circle,draw] {2};

                            fill (7) circle (2.5pt);

                            draw (1) to (7);
                            draw (4) to (7);
                            draw (3) to (7);
                            draw (2) to (7);
                            end{tikzpicture}
                            end{document}


                            enter image description here







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered Nov 16 at 17:58









                            nidhin

                            1,420820




                            1,420820






















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