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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 2013 by Christian Feuersaenger
%
% 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/>.
%
%--------------------------------------------
% This library adds support for high-level instructions for "fill area
% between two arbitrary plots of functions".
%
% It activates the syntax
%
% \addplot fill between[of=A and B];
%
% where A and B are two plots named by 'name path='.
%
% In fact, this here is not much more than a low-level invocation of
% \pgfpathfillbetween
% and a couple of styles. It could become a TikZ library because it
% actually works on any two named paths, but it has its restrictions
% regarding the supported input paths: both need to be plots of
% functions (non-intersecting, should have at most one function value
% for each canvas X coord)
\pgfutil@IfUndefined{pgfplotsset}{%
\pgferror{Please load pgfplots before pgfplots.fillbetween.}%
\endinput
}{}%
\usetikzlibrary{fillbetween}
\usepgfplotslibrary{decorations.softclip}
% Takes a domain #1:#2 and returns a new domain \pgfplotsretval:\pgfplotsretvalb which is larger.
\def\pgfplots@softclip@enlarge#1#2{%
\begingroup
\pgfplotscoordmath{default}{parse}{0.1*(#2-#1)}\let\pgfplots@diff=\pgfmathresult
\pgfplotscoordmath{default}{if is}{\pgfplots@diff}{+}{%
% ok, max > min. Should always be the case.
\pgfplotscoordmath{default}{parse}{#1-\pgfplots@diff}\let\pgfplots@min=\pgfmathresult
\pgfplotscoordmath{default}{parse}{#2+\pgfplots@diff}\let\pgfplots@max=\pgfmathresult
}{%
\pgfplotscoordmath{default}{if is}{\pgfplots@diff}{0}{%
% ok, max == min. Very Strange.
\pgfplotscoordmath{default}{parse}{#1-1}\let\pgfplots@min=\pgfmathresult
\pgfplotscoordmath{default}{parse}{#2+1}\let\pgfplots@max=\pgfmathresult
}{%
% ok, max < min. Strange.
\pgfplotscoordmath{default}{parse}{#1+\pgfplots@diff}\let\pgfplots@min=\pgfmathresult
\pgfplotscoordmath{default}{parse}{#2-\pgfplots@diff}\let\pgfplots@max=\pgfmathresult
}%
}%
\global\let\pgfplots@glob@TMPa=\pgfplots@min
\global\let\pgfplots@glob@TMPb=\pgfplots@max
\endgroup
\let\pgfplotsretval=\pgfplots@glob@TMPa
\let\pgfplotsretvalb=\pgfplots@glob@TMPb
}%
\pgfkeys{
/pgfplots/every fill between plot/.style={/pgfplots/area legend,/tikz/fill,/pgfplots/on layer=pre main},
/tikz/soft clip assign/domain/.code args={#1:#2}{%
\pgfplotsifisvisualizationphase{%
\ifpgfplots@yislinear
\pgfplots@softclip@enlarge
{min(\pgfkeysvalueof{/pgfplots/ymin},\pgfplots@data@ymin)}%
{max(\pgfkeysvalueof{/pgfplots/ymax},\pgfplots@data@ymax)}%
\else
\pgfplots@softclip@enlarge{\pgfkeysvalueof{/pgfplots/ymin}}{\pgfkeysvalueof{/pgfplots/ymax}}%
\fi
\edef\pgfplots@loc@TMPa{%
(axis cs:#1,\pgfplotsretval)
rectangle (axis cs:#2,\pgfplotsretvalb)}%
\pgfkeysalso{/tikz/soft clip assign/path/.expand once=\pgfplots@loc@TMPa}%
}{}%
},%
/tikz/soft clip assign/y domain y/.style={/tikz/soft clip assign/domain y={#1}},
/tikz/soft clip assign/domain y/.code args={#1:#2}{%
\pgfplotsifisvisualizationphase{%
\ifpgfplots@yislinear
\pgfplots@softclip@enlarge
{min(\pgfkeysvalueof{/pgfplots/xmin},\pgfplots@data@xmin)}%
{max(\pgfkeysvalueof{/pgfplots/xmax},\pgfplots@data@xmax)}%
\else
\pgfplots@softclip@enlarge{\pgfkeysvalueof{/pgfplots/xmin}}{\pgfkeysvalueof{/pgfplots/xmax}}%
\fi
\edef\pgfplots@loc@TMPa{%
(axis cs:\pgfplotsretval,#1)
rectangle (axis cs:\pgfplotsretvalb,#2)}%
\pgfkeysalso{/tikz/soft clip assign/path/.expand once=\pgfplots@loc@TMPa}%
}{}%
},%
%
/pgfplots/execute at begin axis@@/.add={}{%
\gdef\b@pgfplotsfillbetween@list@has@set@layers{0}%
},
}
% The options are from
% \addplot[#1] fill between[#2] #3;
%
% This method is invoked from the global \addplot dispatching.
\def\pgfplotslibraryfillbetween@addplot#1#2#3{%
%
\pgfplots@start@plot@with@behavioroptions{/pgfplots/every fill between plot,#1}%
%
% '/tikz/fill between/on layer' is not really integrated into the option processing of pgfplots.
% improve it here (to some extend):
\pgfkeysgetvalue{/pgfplots/on layer}\pgfplots@loc@TMPa
\pgfkeyslet{/tikz/fill between/on layer}{\pgfplots@loc@TMPa}%
%
% FIXME: is this here an accident!?
\pgfkeysvalueof{/pgfplots/execute at end survey}%
\pgfplots@remember@survey@option@list
%
%
\pgfplotslibraryfillbetweenpreparecurrentlayer
%
\pgfplots@addplot@enqueue@coords{%
% precmd
}{%
% empty - this here is a TikZ instruction, not a "real" \addplot command
}{%
\def\b@pgfplots@fillbetween@clip@on@layer{0}%
\pgfkeysgetvalue{/tikz/fill between/on layer}\pgfplots@loc@TMPa
\edef\pgfplots@fillbetween@layer{\pgfplots@loc@TMPa}%
\ifx\pgfplots@fillbetween@layer\pgfutil@empty
\else
\ifpgfplots@clip
\def\b@pgfplots@fillbetween@clip@on@layer{1}%
% This here is messy: we have to clip on the other
% layer. I gave up to install this clip path once
% per axis, that's why I do it for each individual
% fillbetween - let us hope this is not too
% inefficient.
%
% I had to give up because the result appears to
% require a pattern of sorts
% \onlayer{L}
% \scope
% \clip ... ;
% \endonlayer
% ...
%
% \onlayer{L}
% \endscope
% \endonlayer
%
% which is forbidden in TeX -- and using
% \pgfsys@beginscope resulted in invalid PDF.
%
\pgfplotsonlayer{\pgfplots@loc@TMPa}%
\scope
\pgfplotspathaxisoutline
\pgfusepath{clip}%
\fi
\fi
%
% the path instruction:
\tikzfillbetween[#2]{%
/pgfplots/.search also=/tikz,%
/pgfplots/.cd,%
/tikz/fill between/every last segment/.append style={/tikz/fill between/path after segment={#3}},%
#1%
}%
%
\if1\b@pgfplots@fillbetween@clip@on@layer
\endscope
\endpgfplotsonlayer%
\fi
}{%
% post command.
}%
}
% ONLY TO BE USED AS LATER OPTION!
\pgfkeysdef{/pgfplots/fill between/@ensure layers}{%
\ifpgfplots@layered@graphics
\else
\pgfplots@log3{fill between: activating layered graphics}%
\pgfplotsset{set layers}%
\pgfplots@set@options@of@layered@graphics
\fi
}%
% SIDE-EFFECT: modifies \b@pgfplotsfillbetween@list@has@set@layers and
\def\pgfplotslibraryfillbetweenpreparecurrentlayer{%
\pgfkeysgetvalue{/tikz/fill between/on layer}\pgfplots@loc@TMPa
\ifx\pgfplots@loc@TMPa\pgfutil@empty
\else
\if0\b@pgfplotsfillbetween@list@has@set@layers
%
\pgfplotssetlateoptions{fill between/@ensure layers}%
\gdef\b@pgfplotsfillbetween@list@has@set@layers{1}%
\fi
\fi
}
\def\pgfplots@tikzfillbetween{\pgfutil@ifnextchar[{\pgfplots@tikzfillbetween@opt}{\pgfplots@tikzfillbetween@opt[]}}
\def\pgfplots@tikzfillbetween@opt[#1]#2{%
\pgfplots@addplot@enqueue@coords{%
% precmd
}{%
% empty - this here is a TikZ instruction, not a "real" \addplot command
}{%
% the path instruction:
\tikzfillbetween[#1]{#2}%
}{%
% post command.
}%
}%
\expandafter\def\expandafter\pgfplots@replace@path@commands\expandafter{\pgfplots@replace@path@commands
\let\pgfplots@orig@tikzfillbetween=\tikzfillbetween
\let\tikzfillbetween=\pgfplots@tikzfillbetween
}%
\expandafter\def\expandafter\pgfplots@restore@path@commands\expandafter{\pgfplots@restore@path@commands
\let\tikzfillbetween=\pgfplots@orig@tikzfillbetween
}
\endinput
|
