Document Classes ⇒ arrow tips and double arrows in tikz pgf

[leloo_d]

Hi
I have a question concerning arrows in tikz pgf
I need to create a diagramm that looks like the one shown in the attatched picture. I suppose that this was done in tex to, but I do not know how.
(The diagramm is a representation of the Needham Schroeder Protocol modelled in Strand Spaces,a verification technique for security protocols).



I would like to do it with tikz pgf, but my problem is, that the double arrows do not look like the arrows in the sample. The tip is way to thick
(As far as I understood the explanation i found in the 300 pages manual, this has to do with the way double arrows are drawn: one thick line and than a thin line in the background color. )

Code: Select all

Code, edit and compile here:

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\draw [->,double,shorten <=1pt,>=angle 90,thick](A2) -- (A1);
\node  [place] (B2)[below of =B1] {}
    edge [double distance=2pt,->,>=angle 90,thick]node {b}(A2);
 
 
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Run LaTeX here

Thank you

Sarah

[propell]

TikZ has a special option for sizing such arrows: 'double equal sign distance'
You should also use the -implies arrow style.

Here is a simple example that shows how it works:

Code: Select all

Code, edit and compile here:

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\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows,matrix}
\begin{document}
\begin{tikzpicture}[
    implies/.style={double,double equal sign distance,-implies},
    dot/.style={shape=circle,fill=black,minimum size=2pt,
                inner sep=0pt,outer sep=2pt},
]
\matrix[matrix of nodes] {
    |[dot,label=above:$A$] (A1)| {} &[2cm] |[dot,label=above:$B$] (B1)| {}\\[1cm]
    |[dot] (A2)| {} & |[dot] (B2)| {}\\
};
\draw (A1) edge[->] node[above] {${N_aA}_{K_B}$} (B1)
           edge[implies] (A2); 
\draw (B2) edge[->] node[above] {${N_aA}_{K_B}$} (A2)
           edge[implies,implies-] (B1); 
\end{tikzpicture}
\end{document}
 
 
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Run LaTeX here

Hope this helps.

- Kjell Magne Fauske

[server988]

TikZ has a special option for sizing such arrows: 'double equal sign distance'
You should also use the -implies arrow style.

Here is a simple example that shows how it works:

First thanks very much for your answer.

Did you see my code ? Does this mean that i have to re-write a ' virtual ' matrix of nodes in order to have the proper arrows ?

And my problem is that when I try this :

Code: Select all

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 \draw[|-,-|,->, thick ] (imp.east) |-+(0,0em)-| (ond.east);
 
 
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I Get this : ( see attachement )


Starting with your code, could i draw the arrow the way i want to ?

Thanks

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I know your question was specifically about the tikz pgf, but I'm also drawing Strand Spaces pictures in latex. I've been successfully using \xymatrix for quite some time, and the pictures look exactly like shown in your example. For Needham-Schroeder, for instance, the code would be:
 
 
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I don't know why it didn't work when i compiled it. Anyway maybe i can reach you with MSN.


By the way, i need to finish this tonight... because i have to show it in an exam.

I know that i should have done this a long time ago.... , anyway if anyone could help me to finish this i would be sooo grateful. Thanks