Dear Roman,
If I understand correctly, your question is more about the fact that you
find an oval instead of a circle. Is that right?
In that case, the answer is: pgfplots uses the loglog coordinate system
as expected, but it rescales the unit vectors in order to a) fit the
axis into the prescribed dimensions and b) to view a "good" portion of
the axis. This rescaling is usually not the same for both axis,
resulting in an oval rather than a circle. Consider using the "axis
equal" option in order to get a real circle (although this will change
your limits such that the axis still fits into the dimensions).
Does this help?
Concerning the placement: it seems to me that the placement is correct.
The unit "0.25" and the coordinate "(0,-0.25)" are expressed in the
completely scaled pgfplots system which means that their meaning is a
little bit unclear.
Best regards
Christian
Am 11.04.2011 22:13, schrieb Roman Yurchak:
> Hello,
>
> I would like to make annotations to a loglog figure using 'after end
> axis' as explained in the manual. The minimal working example would be:
>
> %--------------------------------------------------------------------
> \begin{tikzpicture}
> \begin{axis}[
> xmin=5.0e-01, xmax=1.0e+01,
> ymin=3.0e-01, ymax=2.5e+01,
> xmode=log,
> ymode=log,
> after end axis/.code={
> \begin{scope}[shift={(axis cs:1.,10.)}]
> \draw[thin, gray] (0,0) circle (0.25);
> \draw[<->] (0,-0.25) -- (0,0.25);
> \draw[<->, blue] (-0.25,0) -- (0.25,0);
> \end{scope}
> }]
>
> %...data...
>
> \end{axis}
> \draw[thin, red, shift={(2.5,4.5)}] (0,0) circle (0.25);
> \end{tikzpicture}
> %-------------------------------------------------------------------
>
> however it seems that the the coordinate system I get inside "after
> end axis/.code" is not the the normal one (nor the loglog) but something
> linear with xscale!=yscale: it draws an oval instead of a circle.
> I'm not very familiar with tikz coordinate system, so am I doing
> something wrong here?
>
> Thank you in advance,
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