[Pgfplots-features] Smith chart coordinate systems

[Christian M. <c.m...@gm...>]

Hello,

recent changes in the smith chart code, especially in coordinate system 
handling, broke my existing figures, and it took a while to find out how 
to deal with CS in recent versions of pgfplots. Since this is not 
covered by the manual, it would be nice if it could be explained there 
for other people working with that (it is only explained for \addplot): 
In the example

\documentclass{standalone}

\usepackage{pgfplots}
\usepgfplotslibrary{smithchart}

\pgfplotsset{compat=newest}

\begin{document}
   \begin{tikzpicture}
     \begin{smithchart}
%     \pgfplotsset{is smithchart cs}
%     \begin{scope}[/pgfplots/is smithchart cs]
       \draw [black!40,dashed] (0,0) arc (0:360:.5);
%     \end{scope}
     \end{smithchart}
   \end{tikzpicture}
\end{document}

recent versions do the CS transformation not only for \addplot commands 
but for \draw commands etc. as well. One can skip the transformation for 
them as well by setting /pgfplots/is smithchart cs, e.g. within a scope 
environment. It would be handy if the key could be mapped to the tikz 
namespace to be able to skip the /pgfplots/. What does not work is 
setting \pgfplotsset{is smithchart cs}, it will result in a dimension 
too large error at \end{smithchart} (a bug, maybe?).

Best regards

Chris