TikZ: What EXACTLY does the the |- notation for arrows do?












21















I am currently trying to work out how the perpendicular arrows work, and I fail.



Taking:



draw [arrow] (node1) -- node[sloped, above] {Caption} (node1 |- node2.north west);


I suspected that the notation meant:

Draw an arrow from node 1, to the north-west corner of node 2.

Make the arrow perpendicular to node 1.



Further attempts to draw arrows told me: No, that's not it. I have sadly failed to figure out what exactly the notation is supposed to be doing though! Is there any "explanation for dummies" that will lead me to understand what exactly 



node1 |-


Is supposed to do?



Thanks!






tikz-arrows







share|improve this question





























    21















    I am currently trying to work out how the perpendicular arrows work, and I fail.



    Taking:



    draw [arrow] (node1) -- node[sloped, above] {Caption} (node1 |- node2.north west);


    I suspected that the notation meant:

    Draw an arrow from node 1, to the north-west corner of node 2.

    Make the arrow perpendicular to node 1.



    Further attempts to draw arrows told me: No, that's not it. I have sadly failed to figure out what exactly the notation is supposed to be doing though! Is there any "explanation for dummies" that will lead me to understand what exactly 



    node1 |-


    Is supposed to do?



    Thanks!






    tikz-arrows







    share|improve this question



























      21












      21








      21


      6






      I am currently trying to work out how the perpendicular arrows work, and I fail.



      Taking:



      draw [arrow] (node1) -- node[sloped, above] {Caption} (node1 |- node2.north west);


      I suspected that the notation meant:

      Draw an arrow from node 1, to the north-west corner of node 2.

      Make the arrow perpendicular to node 1.



      Further attempts to draw arrows told me: No, that's not it. I have sadly failed to figure out what exactly the notation is supposed to be doing though! Is there any "explanation for dummies" that will lead me to understand what exactly 



      node1 |-


      Is supposed to do?



      Thanks!






      tikz-arrows







      share|improve this question
















      I am currently trying to work out how the perpendicular arrows work, and I fail.



      Taking:



      draw [arrow] (node1) -- node[sloped, above] {Caption} (node1 |- node2.north west);


      I suspected that the notation meant:

      Draw an arrow from node 1, to the north-west corner of node 2.

      Make the arrow perpendicular to node 1.



      Further attempts to draw arrows told me: No, that's not it. I have sadly failed to figure out what exactly the notation is supposed to be doing though! Is there any "explanation for dummies" that will lead me to understand what exactly 



      node1 |-


      Is supposed to do?



      Thanks!






      tikz-arrows




      tikz-arrows






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 15 '17 at 11:55







      Layna

















      asked Nov 15 '17 at 11:25









      LaynaLayna

      22717




      22717






















          2 Answers
          2






          active

          oldest

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          32














          There are two different places to use -|/|-:





          1. In a coordinate specification.



            This is what you have used, the general form is



            (a -| b)


            where a and b are named nodes or coordinates. This means the coordinate that is at the y-coordinate of a, and x-coordinate of b. Similarly, (a |- b) has the x-coordinate of a and y-coordinate of b.



            For example, the following code draws a horizontal arrow from a at (0,0) to (1,0).



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -- (a -| b);
            
end{tikzpicture}
            
end{document}


            You can also use this as



            coordinate (c) at (a -| b);


            and then draw [->] (a) -- (c); does the same as the above.




          2. As a path specification.



            This is used between two coordinates, in place of --.



            With draw [->] (a) -| (b); the arrow goes horizontally from a, then vertically up to b. (And with |- it would be vertically first, then horizontally.)



            output of code



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -| (b);
            
end{tikzpicture}
            
end{document}







          share|improve this answer



















          • 6





            The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

            – Andrey R
            Nov 15 '17 at 22:11



















          3














          If $a$ is a coordinate/node at position $(a_x, a_y)$ and $b$ is at $(b_x, b_y)$ then 



          $ a |- b := (a_x, b_y) $
          

          
$a -| b := (a_y, b_x) $


          They're just shorthands for combining the x/y coordinates of two points.



          EDIT: Huh, doesn't MathJAX work here? Then again, raw $ ... $ notation should be clear to TeX users, so I'll leave it as it is.






          share|improve this answer





















          • 1





            This is already mentioned in Torbjorn's answer no?

            – percusse
            Nov 15 '17 at 14:10






          • 2





            No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

            – Torbjørn T.
            Nov 15 '17 at 14:36











          • The second line should be a-|b := (b_x, a_y)...

            – Paul Gaborit
            7 mins ago











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          2 Answers
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          active

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          2 Answers
          2






          active

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          active

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          active

          oldest

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          32














          There are two different places to use -|/|-:





          1. In a coordinate specification.



            This is what you have used, the general form is



            (a -| b)


            where a and b are named nodes or coordinates. This means the coordinate that is at the y-coordinate of a, and x-coordinate of b. Similarly, (a |- b) has the x-coordinate of a and y-coordinate of b.



            For example, the following code draws a horizontal arrow from a at (0,0) to (1,0).



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -- (a -| b);
            
end{tikzpicture}
            
end{document}


            You can also use this as



            coordinate (c) at (a -| b);


            and then draw [->] (a) -- (c); does the same as the above.




          2. As a path specification.



            This is used between two coordinates, in place of --.



            With draw [->] (a) -| (b); the arrow goes horizontally from a, then vertically up to b. (And with |- it would be vertically first, then horizontally.)



            output of code



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -| (b);
            
end{tikzpicture}
            
end{document}







          share|improve this answer



















          • 6





            The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

            – Andrey R
            Nov 15 '17 at 22:11
















          32














          There are two different places to use -|/|-:





          1. In a coordinate specification.



            This is what you have used, the general form is



            (a -| b)


            where a and b are named nodes or coordinates. This means the coordinate that is at the y-coordinate of a, and x-coordinate of b. Similarly, (a |- b) has the x-coordinate of a and y-coordinate of b.



            For example, the following code draws a horizontal arrow from a at (0,0) to (1,0).



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -- (a -| b);
            
end{tikzpicture}
            
end{document}


            You can also use this as



            coordinate (c) at (a -| b);


            and then draw [->] (a) -- (c); does the same as the above.




          2. As a path specification.



            This is used between two coordinates, in place of --.



            With draw [->] (a) -| (b); the arrow goes horizontally from a, then vertically up to b. (And with |- it would be vertically first, then horizontally.)



            output of code



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -| (b);
            
end{tikzpicture}
            
end{document}







          share|improve this answer



















          • 6





            The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

            – Andrey R
            Nov 15 '17 at 22:11














          32












          32








          32







          There are two different places to use -|/|-:





          1. In a coordinate specification.



            This is what you have used, the general form is



            (a -| b)


            where a and b are named nodes or coordinates. This means the coordinate that is at the y-coordinate of a, and x-coordinate of b. Similarly, (a |- b) has the x-coordinate of a and y-coordinate of b.



            For example, the following code draws a horizontal arrow from a at (0,0) to (1,0).



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -- (a -| b);
            
end{tikzpicture}
            
end{document}


            You can also use this as



            coordinate (c) at (a -| b);


            and then draw [->] (a) -- (c); does the same as the above.




          2. As a path specification.



            This is used between two coordinates, in place of --.



            With draw [->] (a) -| (b); the arrow goes horizontally from a, then vertically up to b. (And with |- it would be vertically first, then horizontally.)



            output of code



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -| (b);
            
end{tikzpicture}
            
end{document}







          share|improve this answer













          There are two different places to use -|/|-:





          1. In a coordinate specification.



            This is what you have used, the general form is



            (a -| b)


            where a and b are named nodes or coordinates. This means the coordinate that is at the y-coordinate of a, and x-coordinate of b. Similarly, (a |- b) has the x-coordinate of a and y-coordinate of b.



            For example, the following code draws a horizontal arrow from a at (0,0) to (1,0).



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -- (a -| b);
            
end{tikzpicture}
            
end{document}


            You can also use this as



            coordinate (c) at (a -| b);


            and then draw [->] (a) -- (c); does the same as the above.




          2. As a path specification.



            This is used between two coordinates, in place of --.



            With draw [->] (a) -| (b); the arrow goes horizontally from a, then vertically up to b. (And with |- it would be vertically first, then horizontally.)



            output of code



            documentclass[border=10pt]{standalone}
            
usepackage{tikz}
            
begin{document}
            
begin{tikzpicture}
            
coordinate (a) at (0,0);
            
coordinate (b) at (1,1);
            

            
draw [->] (a) -| (b);
            
end{tikzpicture}
            
end{document}








          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 15 '17 at 11:38









          Torbjørn T.Torbjørn T.

          157k13253442




          157k13253442








          • 6





            The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

            – Andrey R
            Nov 15 '17 at 22:11














          • 6





            The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

            – Andrey R
            Nov 15 '17 at 22:11








          6




          6





          The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

          – Andrey R
          Nov 15 '17 at 22:11





          The analogy between the coordinate and path specifications can be seen by noting that draw (a) -| (b); is equivalent to draw (a) -- (a-|b) -- (b) ;.

          – Andrey R
          Nov 15 '17 at 22:11











          3














          If $a$ is a coordinate/node at position $(a_x, a_y)$ and $b$ is at $(b_x, b_y)$ then 



          $ a |- b := (a_x, b_y) $
          

          
$a -| b := (a_y, b_x) $


          They're just shorthands for combining the x/y coordinates of two points.



          EDIT: Huh, doesn't MathJAX work here? Then again, raw $ ... $ notation should be clear to TeX users, so I'll leave it as it is.






          share|improve this answer





















          • 1





            This is already mentioned in Torbjorn's answer no?

            – percusse
            Nov 15 '17 at 14:10






          • 2





            No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

            – Torbjørn T.
            Nov 15 '17 at 14:36











          • The second line should be a-|b := (b_x, a_y)...

            – Paul Gaborit
            7 mins ago
















          3














          If $a$ is a coordinate/node at position $(a_x, a_y)$ and $b$ is at $(b_x, b_y)$ then 



          $ a |- b := (a_x, b_y) $
          

          
$a -| b := (a_y, b_x) $


          They're just shorthands for combining the x/y coordinates of two points.



          EDIT: Huh, doesn't MathJAX work here? Then again, raw $ ... $ notation should be clear to TeX users, so I'll leave it as it is.






          share|improve this answer





















          • 1





            This is already mentioned in Torbjorn's answer no?

            – percusse
            Nov 15 '17 at 14:10






          • 2





            No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

            – Torbjørn T.
            Nov 15 '17 at 14:36











          • The second line should be a-|b := (b_x, a_y)...

            – Paul Gaborit
            7 mins ago














          3












          3








          3







          If $a$ is a coordinate/node at position $(a_x, a_y)$ and $b$ is at $(b_x, b_y)$ then 



          $ a |- b := (a_x, b_y) $
          

          
$a -| b := (a_y, b_x) $


          They're just shorthands for combining the x/y coordinates of two points.



          EDIT: Huh, doesn't MathJAX work here? Then again, raw $ ... $ notation should be clear to TeX users, so I'll leave it as it is.






          share|improve this answer















          If $a$ is a coordinate/node at position $(a_x, a_y)$ and $b$ is at $(b_x, b_y)$ then 



          $ a |- b := (a_x, b_y) $
          

          
$a -| b := (a_y, b_x) $


          They're just shorthands for combining the x/y coordinates of two points.



          EDIT: Huh, doesn't MathJAX work here? Then again, raw $ ... $ notation should be clear to TeX users, so I'll leave it as it is.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 17 mins ago









          AndréC

          9,28111447




          9,28111447










          answered Nov 15 '17 at 14:05









          BristolBristol

          665515




          665515








          • 1





            This is already mentioned in Torbjorn's answer no?

            – percusse
            Nov 15 '17 at 14:10






          • 2





            No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

            – Torbjørn T.
            Nov 15 '17 at 14:36











          • The second line should be a-|b := (b_x, a_y)...

            – Paul Gaborit
            7 mins ago














          • 1





            This is already mentioned in Torbjorn's answer no?

            – percusse
            Nov 15 '17 at 14:10






          • 2





            No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

            – Torbjørn T.
            Nov 15 '17 at 14:36











          • The second line should be a-|b := (b_x, a_y)...

            – Paul Gaborit
            7 mins ago








          1




          1





          This is already mentioned in Torbjorn's answer no?

          – percusse
          Nov 15 '17 at 14:10





          This is already mentioned in Torbjorn's answer no?

          – percusse
          Nov 15 '17 at 14:10




          2




          2





          No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

          – Torbjørn T.
          Nov 15 '17 at 14:36





          No, MathJax doesn't work. See tex.meta.stackexchange.com/questions/1272/… and linked questions.

          – Torbjørn T.
          Nov 15 '17 at 14:36













          The second line should be a-|b := (b_x, a_y)...

          – Paul Gaborit
          7 mins ago





          The second line should be a-|b := (b_x, a_y)...

          – Paul Gaborit
          7 mins ago


















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