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%--------------------------------------------
%
% Package pgfplots
%
% Provides a user-friendly interface to create function plots (normal
% plots, semi-logplots and double-logplots).
%
% It is based on Till Tantau's PGF package.
%
% Copyright 2007-2012 by Christian Feuersänger.
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
%
%--------------------------------------------
%
\newif\ifpgfplots@path@replace@ellipse
\def\pgfplots@install@path@replacements{%
\ifpgfplots@path@replace@ellipse
\let\tikz@do@circle=\pgfplots@path@@tikz@do@circle
\let\tikz@do@ellipse=\pgfplots@path@@tikz@do@ellipse
\expandafter\def\expandafter\pgfinterruptpicture\expandafter{\pgfinterruptpicture
\let\tikz@do@circle=\pgfplots@path@@tikz@do@circle@orig
\let\tikz@do@ellipse=\pgfplots@path@@tikz@do@ellipse@orig
}%
\fi
}%
\let\pgfplots@path@@tikz@do@circle@orig=\tikz@do@circle
\let\pgfplots@path@@tikz@do@ellipse@orig=\tikz@do@ellipse
% This is a replacement for \tikz@do@circle which replaces the "xy"
% coordinate system by one which is compatible with pgfplots.
\def\pgfplots@path@@tikz@do@circle#1{%
\begingroup
\ifpgfplots@usefpu
\pgfkeys{/pgf/fpu,/pgf/fpu/output format=fixed}%
\fi
\pgfmathparse{#1}%
\let\tikz@ellipse@x=\pgfmathresult%
\ifpgfmathunitsdeclared
\pgfpathellipse{\pgfpointorigin}%
{\pgfqpoint{\tikz@ellipse@x pt}{0pt}}%
{\pgfpoint{0pt}{\tikz@ellipse@x pt}}%
\else
\pgfpathellipse{\pgfpointorigin}%
{\pgfplotspointaxisdirectionxy{\tikz@ellipse@x}{0}}%
{\pgfplotspointaxisdirectionxy{0}{\tikz@ellipse@x}}%
\fi
\endgroup
}
\def\pgfplots@path@@tikz@do@ellipse#1#2{%
\begingroup
\ifpgfplots@usefpu
\pgfkeys{/pgf/fpu,/pgf/fpu/output format=fixed}%
\fi
\pgfmathparse{#1}%
\let\tikz@ellipse@x=\pgfmathresult%
\ifpgfmathunitsdeclared%
\pgfmathparse{#2}%
\let\tikz@ellipse@y=\pgfmathresult%
\ifpgfmathunitsdeclared%
\pgfpathellipse{\pgfpointorigin}{%
\pgfqpoint{\tikz@ellipse@x pt}{0pt}}{\pgfpoint{0pt}{\tikz@ellipse@y pt}}%
\else%
\PackageError{tikz}{You cannot mix dimensions and dimensionless values in an ellipse}{}%
\fi%
\else%
\pgfmathparse{#2}%
\let\tikz@ellipse@y=\pgfmathresult%
\ifpgfmathunitsdeclared%
\PackageError{tikz}{You cannot mix dimensions and dimensionless values in an ellipse}{}%
\else%
\pgfpathellipse{\pgfpointorigin}
{\pgfplotspointaxisdirectionxy{\tikz@ellipse@x}{0}}
{\pgfplotspointaxisdirectionxy{0}{\tikz@ellipse@y}}%
\fi%
\fi%
\endgroup
}
% Older versions of TikZ did not define \tikz@do@ellipse but only
% \tikz@do@circle which took the place of \tikz@do@ellipse, i.e. the same code
% was used for both paths. In that case, we override the new circle code with
% the ellipse code to retain the behaviour of using the same code on both
% paths.
\ifdefined\tikz@do@ellipse\else
\let\pgfplots@path@@tikz@do@circle=\pgfplots@path@@tikz@do@ellipse
\fi
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