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I'm trying to draw Brownian motion on the unit circle $S^{1}$ $({Z \in \mathbb{C} : |Z|=1})$ using the package TikZ. Here is the picture that I am trying to get:

enter image description here

I have just a simple example to circle :

    \draw[step=.5cm,gray,very thin] (-1.4,-1.4) grid (1.4,1.4);
    \draw (-1.5,0) -- (1.5,0);
    \draw (0,-1.5) -- (0,1.5);
    \draw (0,0) circle (1cm);
    \draw (3mm,0mm) arc (0:30:3mm);
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up vote 6 down vote accepted

With PSTricks (version 1)


enter image description here

With PSTricks (version 2)


enter image description here

Without PSTricks

    \draw[blue] (0,0) circle (1);
    \fill (0,0) circle (1pt);
    \fill (30:1) circle (1pt);
    \draw (0,0) -- (30:1);
    \node[anchor=150] at (30:1) {$z$};
    \node[anchor=west] at (0,1) {$i_z$};
    \node[anchor=north] at (1,0) {$z$};
    \draw[red,<->] (0,1) -- (0,0) -- (1,0);
    \draw (0:6pt) arc (0:90:6pt);

enter image description here

share|improve this answer
hi Thanks Mr Mozartstrabe so much now it's work for me when i Compile it with xelatex or latex -> dvips -> ps2pdf in latex but please if you could to make it wit Tikz – Educ Jul 5 '13 at 10:45
Thanks so much Mr mozarstrabe it's work but i prefer in Tikz Thanks again – Educ Jul 5 '13 at 10:50
Thanks so much just on question how can i make it big in pdf because it plots small in my document – Educ Jul 5 '13 at 11:05
Thanks so much for ur time and ur help Please accept,Mr Mozarstrabe , the assurances of my highest consideration – Educ Jul 5 '13 at 11:12
sorry Mr Mozartstrasse – Educ Jul 5 '13 at 13:29

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