Hi Stefan,
you asked me to add a feature which automatically assigns labels to
coordinates in order to allow something like
\node[pin=the 4th coord] at (coord4) {};
Well, this is already possible without any further changes:
\begin{tikzpicture}
\begin{axis}[
nodes near coords={},
every node near
coord/.style={anchor=center,name=plotidx\coordindex},
clip marker paths=true]
\addplot {x};
\node[pin=Nummer 4] at (plotidx4) {};
\node[pin=-45:Nummer 14] at (plotidx14) {};
\end{axis}
\end{tikzpicture}
The 'nodes near coords={}' means to install the nodes near coords style
with empty node text. The 'every node near coords/.style' causes the
nodes to be centered at the coordinates and the 'name=...' assigns names.
This defines labeled pgf coordinates plotidx0, ..., plotidx25 .
Unfortunately, the 'clip marker paths=true' thing is still necessary
(might be changed eventually) because pgfplots draws marks (and nodes
near coords) after the axis description.
I hope this helps.
Best regards
Christian
PS
Note that this feature of scatter plots does not necessarily need the
'nodes near coords' style, compare the following code snippet:
\begin{tikzpicture}
\begin{axis}[
samples=5,
%nodes near coords,
scatter,
scatter/@pre marker code/.code={},
scatter/@post marker code/.code={%
\coordinate (plotidx\coordindex) at (0pt,0pt);
},
clip marker paths=true]
\addplot {x};
\node[pin=Nummer 1] at (plotidx1) {};
\end{axis}
\end{tikzpicture}
Here, 'scatter' enables the scatter plot mechanism and the 'pre marker
code' and 'post marker code' things define the named coordinates (and
replace the original scatter plot implementation which produces colored
marks).
This feature can also (safely) be combined with nodes near coords using
'scatter/@post marker code/.append code':
\begin{tikzpicture}
\begin{axis}[
samples=5,
nodes near coords,
scatter/@post marker code/.append code={%
\coordinate (plotidx\coordindex) at (0pt,0pt);
},
clip marker paths=true]
\addplot {x};
\node[pin=Nummer 1] at (plotidx1) {};
\end{axis}
\end{tikzpicture}
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