%%%%
%%% swig  shapes
%%% code for creating multi-part nodes corresponding to split ellipses with a gap
%%%
%%% swig hsplit  : ellipse split horizontally
%%% swig vsplit  : ellipse split vertically
%%%
%%%
%%% Modified from the file:
%%% pgflibraryshapes.multipart.code.tex (Copyright 2007 by Till Tantau and Mark Wibrow)
%%%
%%% Copyright 2018 Thomas S. Richardson

% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/generic/pgf/licenses/LICENSE for more details


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%% swig horizontal split
%%% This is a multi-part node consisting of an ellipse split horizontally into
%%% upper and lower parts

%%Very useful code allows groups of options to be set as: [...  shape=swig hsplit, swig hsplit={ .... }]
\pgfkeys{/tikz/swig hsplit/.code={%
             \pgfkeys{/tikz/swig hsplit/.cd,#1}%
              }}%
%\pgfkeys{/tikz/swig hsplit/color/.initial = black}%
\pgfkeys{/tikz/swig hsplit/line color upper/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig hsplit/line color lower/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig hsplit/fill color upper/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig hsplit/fill color lower/.initial = \pgfutil@empty}%
%\pgfkeys{/tikz/swig hsplit/gap/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig hsplit/gap/.initial = 1.0em}
\pgfkeys{/tikz/swig hsplit/line width upper/.initial = \the\pgflinewidth}%
\pgfkeys{/tikz/swig hsplit/line width lower/.initial = \the\pgflinewidth}%
\pgfkeys{/tikz/swig hsplit/inner line width upper/.initial = 0pt}%
\pgfkeys{/tikz/swig hsplit/inner line width lower/.initial = 0pt}%
%\pgfkeys{/pgf/ellipse splitb/dash/.initial = {{{0.5cm}{0.5cm}{0.1cm}{0.2cm}}{0cm}}

\newbox\pgfnodepartlowerbox  %%Associated with anchor "upper"; see pgfmanual3.1, page 1035
\newbox\pgfnodepartupperbox  %%Associated with anchor "lower"; see pgfmanual3.1, page 1035
%%% Every node must have a center anchor
%%% See pgf manual 3.1; p.1036

\pgfdeclareshape{swig hsplit}{%
       \nodeparts{upper,lower}%
       \savedanchor\upper{%
       \pgf@x0pt\pgf@y0pt\relax%
       }%
%https://tex.stackexchange.com/questions/21555/using-patterns-inside-pgf-shapes
       \savedmacro\uppercolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig hsplit/line color upper}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@strokecolor\pgfutil@empty%if not defined even with draw=
                         \def\uppercolor{.}%
                       \else%
                           \def\uppercolor{\tikz@strokecolor}% if defined with draw=
                       \fi%
                     \else%
                      \def\uppercolor{\expandafter\pgfkeysvalueof{/tikz/swig hsplit/line color upper}}%if defined
                     \fi} %%%Important: adding { } around the last def statement would break this
         \savedmacro\lowercolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig hsplit/line color lower}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@strokecolor\pgfutil@empty%if not defined even with draw=
                         \def\lowercolor{.}%
                       \else%
                           \def\lowercolor{\tikz@strokecolor}% if defined with draw=
                       \fi%
                     \else%
                      \def\lowercolor{\expandafter\pgfkeysvalueof{/tikz/swig hsplit/line color lower}}%if defined
                     \fi} %%%Important: adding { } around the last def statement would break this
%
\savedmacro\upperfillcolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig hsplit/fill color upper}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@fillcolor\pgfutil@empty%if not defined even with fill=
                         \def\upperfillcolor{white}%
                       \else%
                           \def\upperfillcolor{\tikz@fillcolor}% if defined with fill=
                       \fi%
                     \else%
                      \def\upperfillcolor{\expandafter\pgfkeysvalueof{/tikz/swig hsplit/fill color upper}}%if defined
                     \fi}%
\savedmacro\lowerfillcolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig hsplit/fill color lower}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@fillcolor\pgfutil@empty%if not defined even with fill=
                         \def\lowerfillcolor{white}%
                       \else%
                           \def\lowerfillcolor{\tikz@fillcolor}% if defined with fill=
                       \fi%
                     \else%
                      \def\lowerfillcolor{\expandafter\pgfkeysvalueof{/tikz/swig hsplit/fill color lower}}%if defined
                     \fi}%
       %
       \savedanchor\linewidthupper{%
      \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%
      \pgfmathsetlength\pgf@x{0pt}%
       }%
        \savedanchor\linewidthlower{%
      \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%
      \pgfmathsetlength\pgf@x{0pt}%
       }%
       \savedanchor\gap{% This is a coordinate, but \pgf@x is redundant
                          \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig hsplit/gap}}%
%%%%%%%%
       \pgfmathsetlength\pgf@x{0pt}%
       }
       \savedanchor\radii{%
               \pgfmathsetlength\pgf@x{\pgfkeysvalueof{/pgf/inner xsep}}%
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/pgf/inner ysep}}%
               \[email protected]\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%Added to allow for different widths
               \pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%% of lines upper and lower
               \ifdim\pgf@yb>\pgf@ya%
                       \pgf@ya\pgf@yb%
               \fi%
               \advance\[email protected]\pgf@ya%
               \[email protected]\wd\pgfnodepartupperbox%
               \[email protected]\wd\pgfnodepartlowerbox%
               \advance\pgf@xa\pgf@x%
               \advance\pgf@xb\pgf@x%
               \pgf@ya\ht\pgfnodepartupperbox%
               \advance\pgf@ya\dp\pgfnodepartupperbox%
               \pgf@yb\ht\pgfnodepartlowerbox%
               \advance\pgf@yb\dp\pgfnodepartlowerbox%
               \advance\pgf@ya\pgf@y%
               \advance\pgf@yb\pgf@y%
               \ifdim\pgf@xa>\pgf@xb%
                       \[email protected]\pgf@xa%
               \else%
                       \[email protected]\pgf@xb%
               \fi%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/minimum width}}%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/minimum height}}%
               \ifdim\pgf@x<.5\pgf@xa%
                       \[email protected]\pgf@xa%
               \fi%
               \ifdim\pgf@y<.5\pgf@ya%
                       \[email protected]\pgf@ya%
               \fi%
               \pgfmathaddtolength\pgf@x{\pgfkeysvalueof{/pgf/outer xsep}}%
               \pgfmathaddtolength\pgf@y{\pgfkeysvalueof{/pgf/outer ysep}}%
       }
       \savedanchor\lower{%
               \[email protected]\wd\pgfnodepartlowerbox%
               \advance\[email protected]\wd\pgfnodepartupperbox%
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/pgf/inner ysep}}%
               \[email protected]\pgf@y%
               %\advance\pgf@y-\pgflinewidth%
               \advance\pgf@y-\dp\pgfnodepartupperbox%
               \advance\pgf@y-\ht\pgfnodepartlowerbox%
               %%%%%%
                          \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/gap}}%
                %%%%%%%
               \advance\pgf@y-\pgf@ya% %% Added by TSR for gap
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%%%
               \advance\[email protected]\pgf@ya%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%%%
               \advance\[email protected]\pgf@ya%
       }
       \savedanchor\uppercenterpoint{% NOTE: *Not* the same as anchor "upper center" (this saved anchor is in the middle of the line)
               \[email protected]\wd\pgfnodepartupperbox%
               \pgfmathsetlength\pgf@y{-\pgfkeysvalueof{/pgf/inner ysep}}%
               \advance\pgf@y-\dp\pgfnodepartupperbox%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%%%
               \advance\[email protected]\pgf@ya%
       }%
\savedanchor{\greaterlinewidth}{%since seemingly hard to include conditional calculations in anchors (!)
       \pgfmathsetlength{\pgf@xa}{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%
       \pgfmathsetlength{\pgf@x}{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%%
       \ifdim\pgf@xa>\pgf@x%
        \pgf@x\pgf@xa%
        \fi%
        \pgf@y0pt%
}%
       \savedanchor\basepoint{%
               \[email protected]\wd\pgfnodepartupperbox%
               \pgf@y0pt\relax%
       }%
       \savedanchor\gapcenter{%
       \[email protected]\wd\pgfnodepartupperbox%
       \pgfmathsetlength\pgf@y{-\pgfkeysvalueof{/pgf/inner ysep}}%
       \advance\pgf@y-\dp\pgfnodepartupperbox%
       \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%%%
       \advance\[email protected]\pgf@ya%
       \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%%%
       \advance\[email protected]\pgf@ya%
       %%%%%%%
                          \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/gap}}%
       %%%%%%%
       \advance\[email protected]\pgf@ya%
       \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%Added to allow for different widths
               \pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%% of lines upper and lower
       }%
       \savedanchor\basepointlower{%
               \[email protected]\wd\pgfnodepartupperbox%
               %
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/pgf/inner ysep}}%
               \[email protected]\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%%%
               \advance\[email protected]\pgf@ya%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%%%
               \advance\[email protected]\pgf@ya%
               \advance\pgf@y-\dp\pgfnodepartupperbox%
               \advance\pgf@y-\ht\pgfnodepartlowerbox%
               %%%%%%%%%
                          \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/gap}}%
               %%%%%%%%%%
               \advance\pgf@y-\pgf@ya% %% Added by TSR for gap
       }%
       \savedanchor\midpoint{%
               \[email protected]\wd\pgfnodepartupperbox%
               \pgfmathsetlength\pgf@y{.5ex}%
       }%
       \savedanchor\midpointlower{%
               \[email protected]\wd\pgfnodepartupperbox% Note: Origin is SW corner of upper text box
               %
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/pgf/inner ysep}}%
               \[email protected]\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%%%
               \advance\[email protected]\pgf@ya%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}%%%
               \advance\[email protected]\pgf@ya%
               \advance\pgf@y-\dp\pgfnodepartupperbox%
               \advance\pgf@y-\ht\pgfnodepartlowerbox%
               %%%%%%%%%
                          \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig hsplit/gap}}%
               %%%%%%%%%%
               \advance\pgf@y-\pgf@ya%
               \pgfmathsetlength\pgf@ya{.5ex}%
               \advance\pgf@y\pgf@ya%
       }%
       \anchor{upper center}{\linewidthupper\[email protected]\pgf@y\uppercenterpoint\advance\pgf@y\pgf@ya}
       %%% Required see PGF Manual p.1036
       \anchor{center}{\gapcenter}
       \anchor{lower center}{\linewidthlower\[email protected]\pgf@y\gap\advance\pgf@ya-\pgf@y\uppercenterpoint\advance\pgf@y\pgf@ya}%
       %\pgfpointadd{\uppercenterpoint}{\gap\pgf@y-\pgf@y}}
       \anchor{lower}{\lower}
       \anchor{upper}{\upper}
       \anchor{text}{\upper}
       \anchor{lower base}{\basepointlower}
       \anchor{lower mid}{\midpointlower}
       \anchor{mid}{\midpoint}
       \anchor{mid east}{\greaterlinewidth\[email protected]\pgf@x\radii\advance\pgf@xa\pgf@x\midpoint\advance\pgf@x\pgf@xa}
       \anchor{mid west}{\greaterlinewidth\[email protected]\pgf@x\radii\advance\pgf@xa\pgf@x\midpoint\advance\pgf@x-\pgf@xa}
       \anchor{upper base}{\basepoint}
       \anchor{base}{\basepoint}
       \anchor{base east}{\greaterlinewidth\[email protected]\pgf@x\radii%call \radii;  this sets pgf@x and pgf@y
                               \advance\pgf@xa\pgf@x%store pgf@x into pgf@xa
                               \basepoint %call \basepoint; this sets pgf@x and pgf@y
       \advance\pgf@x\pgf@xa}  %  Add \pgf@xa to contents of \pgf@x (!!)
%%
       \anchor{base west}{\greaterlinewidth\[email protected]\pgf@x\radii\advance\pgf@xa\pgf@x\basepoint\advance\pgf@x-\pgf@xa}
       \anchor{north}{\linewidthupper\[email protected]\pgf@y\radii\advance\pgf@ya\pgf@y\uppercenterpoint\advance\pgf@y\pgf@ya}%
       %\pgfpointadd{\uppercenterpoint}{\radii\pgf@x0pt}}%
       \anchor{south}{\linewidthlower\[email protected]\pgf@y\gap\advance\pgf@ya-\pgf@y\radii\advance\pgf@ya-\pgf@y\uppercenterpoint\advance\pgf@y\pgf@ya}%
       %\pgfpointadd{\uppercenterpoint}{\radii\pgf@ya-\pgf@y\gap\pgf@y-\pgf@y\advance\pgf@y\pgf@ya\pgf@x0pt}}%
       \anchor{west}{\pgfpointadd{\gapcenter}{\greaterlinewidth%
                                                                       \[email protected]\pgf@x%
                                                                       \radii%
                                                                       \pgf@x-\pgf@x%
                                                                       \advance\pgf@x\pgf@xa%
                                                                       \pgf@y0pt}}%
       \anchor{east}{\pgfpointadd{\gapcenter}{\greaterlinewidth%
                                                                       \[email protected]\pgf@x%
                                                                       \radii%
                                                                       \advance\pgf@x\pgf@xa%
                                                                       \pgf@y0pt}}%
       \anchor{upper east}{\pgfpointadd{\uppercenterpoint}{\linewidthupper\pgf@xa\pgf@y\radii\pgf@y0pt\advance\[email protected]\pgf@xa}}%%% %
       \anchor{upper west}{\pgfpointadd{\uppercenterpoint}{\linewidthupper\pgf@xa\pgf@y\radii\pgf@x-\pgf@x\pgf@y0pt\advance\[email protected]\pgf@xa}}%
       \anchor{lower west}{\pgfpointadd{\uppercenterpoint}{\linewidthlower\pgf@xa\pgf@y\radii\pgf@xb-\pgf@x\advance\[email protected]\pgf@xa\gap\pgf@y-\pgf@y\pgf@x\pgf@xb}}%
       \anchor{lower east}{\pgfpointadd{\uppercenterpoint}{\linewidthlower\pgf@xa\pgf@y\radii\pgf@xb\pgf@x\advance\[email protected]\pgf@xa\gap\pgf@y-\pgf@y\pgf@x\pgf@xb}}%
       \anchor{north west}{\pgfpointadd{\uppercenterpoint}{\linewidthupper\pgf@ya\pgf@y%
                                        \radii\advance\[email protected]\pgf@ya\advance\[email protected]\pgf@ya%
                                        \[email protected]\pgf@x\[email protected]\pgf@y}}%
       \anchor{south west}{\pgfpointadd{\uppercenterpoint}{\linewidthlower\pgf@ya\pgf@y%
                                       \radii\advance\[email protected]\pgf@ya\advance\[email protected]\pgf@ya%
                                       \[email protected]\pgf@x\[email protected]\pgf@y%
                                       \gap\pgf@y-\pgf@y\advance\pgf@y\pgf@ya\pgf@x\pgf@xa}}%
       \anchor{north east}{\pgfpointadd{\uppercenterpoint}{\linewidthupper\pgf@ya\pgf@y%
                                       \radii\advance\[email protected]\pgf@ya\advance\[email protected]\pgf@ya%
                                       \[email protected]\pgf@x\[email protected]\pgf@y}}%
       \anchor{south east}{\pgfpointadd{\uppercenterpoint}{\linewidthlower\pgf@ya\pgf@y%
                                       \radii\advance\[email protected]\pgf@ya\advance\[email protected]\pgf@ya%
                                       \[email protected]\pgf@x\[email protected]\pgf@y%
                                       \gap\pgf@y-\pgf@y\advance\pgf@y\pgf@ya\pgf@x\pgf@xa}}%
%%%%%%%%% START OF DRAWING HSPLIT
%%%% Upper
\beforebackgroundpath{%
       \edef\defaultpgflinewidth{\the\pgflinewidth}% store default line width
        \pgfsetstrokecolor{\uppercolor}%
         \pgfsetfillcolor{\upperfillcolor}%
                \expandafter\pgfsetlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig hsplit/line width upper}}%
                 \expandafter\pgfsetinnerlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig hsplit/inner line width upper}}%
               \radii%
               \pgfmathaddtolength\pgf@x{-\pgfkeysvalueof{/pgf/outer xsep}}%
               \pgfmathaddtolength\pgf@y{-\pgfkeysvalueof{/pgf/outer ysep}}%
               \pgfutil@tempdima\pgf@x%
               \pgfutil@tempdimb\pgf@y%
               \pgfpathmoveto{\uppercenterpoint\advance\pgf@x-\pgfutil@tempdima}%
               \pgfpatharcaxes{180}{0}{\pgfpoint{\the\pgfutil@tempdima}{0pt}}{\pgfpoint{0pt}{\the\pgfutil@tempdimb}}%
               \pgfpathclose
               \pgfusepath{stroke,fill}
%%%%%% Lower
 \pgfsetlinewidth\defaultpgflinewidth% Reset \the\pgflinewidth to default value (in case changed while drawing upper)
  % \expandafter\pgfsetstrokecolor\expandafter{\pgfkeysvalueof{/tikz/swig hsplit/line color lower}}% old approach
 \pgfsetstrokecolor{\lowercolor}%
   \pgfsetfillcolor{\lowerfillcolor}%
                 \expandafter\pgfsetlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig hsplit/line width lower}}% original
                   \expandafter\pgfsetinnerlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig hsplit/inner line width lower}}%
               \radii%
               \pgfmathaddtolength\pgf@x{-\pgfkeysvalueof{/pgf/outer xsep}}%
               \pgfmathaddtolength\pgf@y{-\pgfkeysvalueof{/pgf/outer ysep}}%
               \pgfutil@tempdima\pgf@x%
               \pgfutil@tempdimb\pgf@y%
               \pgfpathmoveto{\uppercenterpoint\pgf@xa\pgf@x\pgf@ya\pgf@y\advance\pgf@xa\pgfutil@tempdima%
               \gap\advance\pgf@ya-\pgf@y%
               \pgf@x\pgf@xa\pgf@y\pgf@ya%
               }%
               \pgfpatharcaxes{180}{360}{\pgfpoint{-\the\pgfutil@tempdima}{0pt}}{\pgfpoint{0pt}{\the\pgfutil@tempdimb}}%
               \pgfpathclose%
               \pgfusepath{stroke,fill}%
       }
       \anchorborder{%
       \pgfextract@process\externalpoint{}%  %https://tex.stackexchange.com/questions/255492/storing-a-pgfpoint-for-repeated-use
       %%%%%   This stores the current \pgf@x and \pgf@y in the macro \externalpoint
       \linewidthupper%
       \pgf@ya\pgf@y%
               \radii%
       \advance\[email protected]\pgf@ya% add half-line width to x radius
       \advance\[email protected]\pgf@ya% add line width to y radius
       \edef\pgf@marshal{%
               \noexpand\pgfpointadd{\noexpand\pgfpointborderellipse{\noexpand\externalpoint}%
                       {\noexpand\pgfpoint{\the\pgf@x}{\the\pgf@y}}}{\noexpand\uppercenterpoint}%
       }%
       \pgf@marshal%
       \pgf@xa\pgf@x% store the border point
       \pgf@ya\pgf@y% store the border point
       \uppercenterpoint%
       \pgf@yb\pgf@y% store center for upper ellipse
       \pgf@xb\pgf@x% store center for upper ellipse
       \ifdim\pgf@ya<\pgf@yb% if the borderpoint is below center of upper ellipse
% if the border point is below bottom of upper ellipse start over
%                                                %the lower ellipse start over (since lower ellipse may have different thickness)
               \linewidthlower%
                       \pgf@ya\pgf@y%
                       \radii%
                       \advance\[email protected]\pgf@ya% add half-line width to x radius
                       \advance\[email protected]\pgf@ya% add half line width to y radius
                       \edef\pgf@marshal{%
                       \noexpand\pgfpointadd{\noexpand\pgfpointborderellipse{\noexpand\externalpoint}%
                       {\noexpand\pgfpoint{\the\pgf@x}{\the\pgf@y}}}{\noexpand\uppercenterpoint}%
                       }%
                       \pgf@marshal%
                       \pgf@xa\pgf@x% store the border point
                       \pgf@ya\pgf@y% store the border point
                       \gap%
                       \advance\pgf@ya-\pgf@y%  move y coord of border point down
       \fi%
       \pgf@x\pgf@xa%
       \pgf@y\pgf@ya%
 }%
}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%% swig vertical split
%%% This is a multi-part node consisting of an ellipse split vertically into
%%% left and right parts
%%% The text boxes adjust to the size of the text contained in them
%%% (The split may be off-center in order to keep the ellipse smaller.)


%%%%% START OF V-SPLIT SWIG
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%Very useful code allows groups of options to be set as: [...  shape=swig vsplit, swig vsplit={ .... }]
\pgfkeys{/tikz/swig vsplit/.code={%
             \pgfkeys{/tikz/swig vsplit/.cd,#1}%
              }}%
\pgfkeys{/tikz/swig vsplit/line color left/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig vsplit/line color right/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig vsplit/fill color left/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig vsplit/fill color right/.initial = \pgfutil@empty}%
\pgfkeys{/tikz/swig vsplit/gap/.initial = 0.8em}%
\pgfkeys{/tikz/swig vsplit/line width left/.initial = \the\pgflinewidth}%
\pgfkeys{/tikz/swig vsplit/line width right/.initial = \the\pgflinewidth}%
\pgfkeys{/tikz/swig vsplit/inner line width left/.initial = 0pt}%
\pgfkeys{/tikz/swig vsplit/inner line width right/.initial = 0pt}%
%\pgfkeys{/tikz/swig vsplit/prop/.initial = 0.5}%

\newbox\pgfnodepartleftbox  %%Associated with anchor "left"; see pgfmanual3.1, page 1035
\newbox\pgfnodepartrightbox %%Associated with anchor "right"; see pgfmanual3.1, page 1035


%%%
%%%
%% Rectangle "box" contents (with gap=0)
%% 0.5 inner xsep + lefttextbox + inner xsep + 0.5 linewidthleft + gap + 0.5 linewidthright + righttextbox + 0.5 innerxsep
%% origin is at left side of lefttextbox
%%%
\pgfdeclareshape{swig vsplit}{%
       \nodeparts{left,right}
       \savedmacro\leftcolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig vsplit/line color left}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@strokecolor\pgfutil@empty%if not defined even with draw=
                         \def\leftcolor{.}%
                       \else%
                           \def\leftcolor{\tikz@strokecolor}% if defined with draw=
                       \fi%
                     \else%
                      \def\leftcolor{\expandafter\pgfkeysvalueof{/tikz/swig vsplit/line color left}}%if defined
                     \fi} %%%Important: adding { } around the last def statement would break this
         \savedmacro\rightcolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig vsplit/line color right}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@strokecolor\pgfutil@empty%if not defined even with draw=
                         \def\rightcolor{.}%
                       \else%
                           \def\rightcolor{\tikz@strokecolor}% if defined with draw=
                       \fi%
                     \else%
                      \def\rightcolor{\expandafter\pgfkeysvalueof{/tikz/swig vsplit/line color right}}%if defined
                     \fi} %%%Important: adding { } around the last def statement would break this
%
\savedmacro\leftfillcolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig vsplit/fill color left}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@fillcolor\pgfutil@empty%if not defined even with draw=
                         \def\leftfillcolor{white}%
                       \else%
                           \def\leftfillcolor{\tikz@fillcolor}% if defined with draw=
                       \fi%
                     \else%
                      \def\leftfillcolor{\expandafter\pgfkeysvalueof{/tikz/swig vsplit/fill color left}}%if defined
                     \fi} %%%Important: adding { } around the last def statement would break this
         \savedmacro\rightfillcolor{%
              \edef\tikz@temp{\pgfkeysvalueof{/tikz/swig vsplit/fill color right}}%
                 \ifx\tikz@temp\pgfutil@empty\relax%
                         \ifx\tikz@fillcolor\pgfutil@empty%if not defined even with draw=
                         \def\rightfillcolor{white}%
                       \else%
                           \def\rightfillcolor{\tikz@fillcolor}% if defined with draw=
                       \fi%
                     \else%
                      \def\rightfillcolor{\expandafter\pgfkeysvalueof{/tikz/swig vsplit/fill color right}}%if defined
                     \fi} %%%Important: adding { } around the last def statement would break this
%
\savedanchor\gap{% This is a coordinate, but \pgf@y is redundant
       \pgfmathsetlength\pgf@x{\pgfkeysvalueof{/tikz/swig vsplit/gap}}%
       \pgfmathsetlength\pgf@y{0pt}%
       }%
\savedanchor\linewidthleft{% This is a coordinate, but \pgf@x is redundant
      \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%
      \pgfmathsetlength\pgf@x{0pt}%
       }%
\savedanchor\linewidthright{% This is a coordinate, but \pgf@x is redundant
      \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%
      \pgfmathsetlength\pgf@x{0pt}%
       }%
\savedmacro\vsplitangle{%
               \pgf@xa\wd\pgfnodepartleftbox%
               \pgf@xb\wd\pgfnodepartrightbox%
               \pgfmathsetlength\pgf@x{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\[email protected]\pgf@x% inner xsep only added left of gap
               \advance\[email protected]\pgf@x% inner xsep only added right of gap
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%Added to allow for different widths
               \pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%% of lines upper and lower
               \advance\[email protected]\pgf@ya% Add width of line for left part (strictly, 2x half for each side of left half)
               \advance\[email protected]\pgf@yb% Add width of line for left part (strictly 2x half for each side of right half)
       \pgfmathsetmacro{\vsplitangle}{acos((\pgf@xa-\pgf@xb)/(1.414213*(\pgf@xa+\pgf@xb)))}%
       %\pgfmathsetlength\pgf@x{0pt}%
       %\pgfmathsetlength\pgf@y{0pt}%
       }%
\savedanchor\radii{%
               \pgfmathsetlength\pgf@x{\pgfkeysvalueof{/pgf/inner xsep}}%
               %\[email protected]\pgf@x% outer x sep added to both halves
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%Added to allow for different widths
               \pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%% of lines left and right
               \pgf@xa\wd\pgfnodepartleftbox%
               \pgf@xb\wd\pgfnodepartrightbox%
               \advance\[email protected]\pgf@x% add inner x sep to left half;
               \advance\[email protected]\pgf@ya% Add half width of line for left part
               \advance\[email protected]\pgf@x% add inner x sep to right half
               \advance\[email protected]\pgf@yb% Add half width of line for right part
               \advance\pgf@xb\pgf@xa% add left and right box lengths together
               \[email protected]\pgf@xb% divide by 2
               \[email protected]\pgf@xa% compute radius (based on intersect of rectangle box and ellipse at 45 degrees
               %%%%%%%
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/pgf/inner ysep}}%
%%%%
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb\dp\pgfnodepartrightbox%
               \advance\pgf@ya\pgf@y%
               \advance\pgf@yb\pgf@y%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya% compute 2x radius
               \else%
                       \[email protected]\pgf@yb% compute 2x radius
               \fi%
               \[email protected]\pgf@y % divide by 2
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/minimum width}}%
               \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/minimum height}}%
               \ifdim\pgf@x<.5\pgf@xa%
                       \[email protected]\pgf@xa%
               \fi%
               \ifdim\pgf@y<.5\pgf@ya%
                       \[email protected]\pgf@ya%
               \fi%
               \pgfmathaddtolength\pgf@x{\pgfkeysvalueof{/pgf/outer xsep}}%
               \pgfmathaddtolength\pgf@y{\pgfkeysvalueof{/pgf/outer ysep}}%
       }%
\savedanchor\left{%
       \pgf@x0pt\pgf@y0pt\relax%
       }%
\savedanchor\right{%
%               %%%%\[email protected]\wd\pgfnodepartrightbox%
               \pgf@x\wd\pgfnodepartleftbox%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/gap}}%%% Added by TSR store gap distance in ya register
               \advance\pgf@x\pgf@xa%  %% Added by TSR for gap
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%%%
               \advance\[email protected]\pgf@xa%
               \pgf@y0pt\relax%
       }%
\savedanchor\centerleftgapside{%
               \pgf@x\wd\pgfnodepartleftbox%
               %\advance\pgf@x\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\pgf@x\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               %%%%% Repeated code fragment to compute max box height
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya-\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb-\dp\pgfnodepartrightbox%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
               %%%%% End repeated code fragment to compute box height
       }%
\savedanchor\globalcenterpoint{%
               \pgf@x\wd\pgfnodepartleftbox%
               \[email protected]\pgf@x%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\pgf@x1\pgf@xa% (0.5 x 3)-1 inner xsep since on each side of gap)
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/gap}}%
               \advance\[email protected]\pgf@xa%
               %\advance\pgf@x\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%%
               \advance\[email protected]\pgf@xa%
               \pgf@xa\wd\pgfnodepartrightbox%
               \advance\[email protected]\pgf@xa%
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya-\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb-\dp\pgfnodepartrightbox%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
       }%
\savedanchor\linewidthatwidestcenter{% coordinate, but x is redundant
% Slightly obsessive check to find either left or right line width
%   Depending on whether left or right contains the vertical radius.
               \pgf@x\wd\pgfnodepartleftbox%
               \[email protected]\pgf@x%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\pgf@x\pgf@xa% (0.5 x 3) -1 inner xsep since on each side of gap)
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%% of lines left and right
               \advance\[email protected]\pgf@xa%
               \pgf@xa\wd\pgfnodepartrightbox%
               \advance\[email protected]\pgf@xa% This contains x-coord of left center but this may not be the widest point
                                                         % if the global center is right of the gap
               \pgf@xa\wd\pgfnodepartleftbox%
               \pgfmathsetlength\pgf@xb{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\pgf@xa\pgf@xb%
               \pgfmathsetlength\pgf@xb{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xb%
               \ifdim\pgf@x>\pgf@xa%
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%
               \else
               \pgfmathsetlength\pgf@y{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%
               \fi%
               %
               \pgf@x0pt%
       }%
\savedanchor\leftcenter{%
               \pgf@x\wd\pgfnodepartleftbox%
               \[email protected]\pgf@x%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\pgf@x\pgf@xa% (0.5 x 3)-0.5 inner xsep since on each side of gap)
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%% of lines left and right
               \advance\[email protected]\pgf@xa%
               \pgf@xa\wd\pgfnodepartrightbox%
               \advance\[email protected]\pgf@xa%
               %%
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya-\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb-\dp\pgfnodepartrightbox%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
       }%
\savedanchor\rightcenter{%
               \pgf@x\wd\pgfnodepartleftbox%
               \[email protected]\pgf@x%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\pgf@x\pgf@xa% (0.5 x twice inner xsep since on each side of gap)
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/gap}}% for right center
               \advance\pgf@x\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%% of lines left and right
               \advance\[email protected]\pgf@xa%
               \pgf@xa\wd\pgfnodepartrightbox%
               \advance\[email protected]\pgf@xa%
               %%
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya-\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb-\dp\pgfnodepartrightbox%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
       }%
\savedanchor\basepoint{%
               \[email protected]\wd\pgfnodepartleftbox%
               \pgf@y0pt\relax%
       }%
\savedanchor\basepointright{%
               \pgf@x\wd\pgfnodepartleftbox%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/gap}}%%% Added by TSR store gap distance in ya register
               \advance\pgf@x\pgf@xa%  %% Added by TSR for gap
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%%%
               \advance\[email protected]\pgf@xa%
               \advance\[email protected]\wd\pgfnodepartrightbox%
               \pgf@y0pt\relax%
       }%
\savedanchor\midpointleft{%
               \[email protected]\wd\pgfnodepartleftbox%
               %%%% Repeated code fragment for max box height
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya-\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb-\dp\pgfnodepartrightbox%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
       }%
\savedanchor\midpointright{%
                       \pgf@x\wd\pgfnodepartleftbox%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/inner xsep}}%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/gap}}%%% Added by TSR store gap distance in ya register
               \advance\pgf@x\pgf@xa%  %% Added by TSR for gap
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%%%
               \advance\[email protected]\pgf@xa%
               \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%%%
               \advance\[email protected]\pgf@xa%
               \advance\[email protected]\wd\pgfnodepartrightbox%
               %%%% Repeated code fragment for max box height
               \pgf@ya\ht\pgfnodepartleftbox%
               \advance\pgf@ya-\dp\pgfnodepartleftbox%
               \pgf@yb\ht\pgfnodepartrightbox%
               \advance\pgf@yb-\dp\pgfnodepartrightbox%
               \ifdim\pgf@ya>\pgf@yb%
                       \[email protected]\pgf@ya%
               \else%
                       \[email protected]\pgf@yb%
               \fi%
       }%
%%%%%%%%%%%  ANCHORS
       %% Note: anchors left center and right center are the center of the left and right sides of the gap
       %% These are not the same as saved anchors leftcenter and right center which are the centers of the left and right ellipse
       \anchor{left center}{\linewidthleft\[email protected]\pgf@y\centerleftgapside\advance\pgf@x\pgf@xa}
       \anchor{right center}{\linewidthright\[email protected]\pgf@y\gap\advance\pgf@xa\pgf@x\centerleftgapside\advance\pgf@x\pgf@xa}
       \anchor{left ellipse center}{\leftcenter}
       \anchor{right ellipse center}{\rightcenter}
       \anchor{left north}{\radii%
               \pgf@ya\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgf@ya*(sin(\vsplitangle))}%
               \linewidthleft\advance\[email protected]\pgf@y%
               \centerleftgapside\advance\pgf@y\pgf@ya%
               }%
       \anchor{left south}{\radii%
               \pgf@ya\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgf@ya*(sin(\vsplitangle))}%
               \linewidthleft\advance\[email protected]\pgf@y%
               \centerleftgapside\advance\pgf@y-\pgf@ya%
               }%
       \anchor{right north}{\pgfpointadd{\centerleftgapside}{%
               \radii%
               \pgf@ya\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgf@ya*(sin(\vsplitangle))}%
               \linewidthright\advance\[email protected]\pgf@y%
               \gap\pgf@y\pgf@ya%
               }}%
       \anchor{right south}{\pgfpointadd{\centerleftgapside}{%
               \radii%
               \pgf@ya\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgf@ya*(sin(\vsplitangle))}%
               \linewidthright\advance\[email protected]\pgf@y%
               \gap\pgf@y-\pgf@ya%
               }}%
       \anchor{left}{\left}
       \anchor{text}{\left} %Added for compatibility (?)
       \anchor{right}{\right}
       \anchor{center}{\globalcenterpoint}
       \anchor{right base}{\basepointright}
       \anchor{left base}{\basepoint}
       \anchor{base}{\basepoint} %% Added for compatibility
       \anchor{right mid}{\midpointright}
       \anchor{left mid}{\midpointleft}
       \anchor{mid}{\midpointleft}
       \anchor{mid east}{\pgfpointadd{\rightcenter}{\radii\pgf@xa\pgf@x\linewidthright\[email protected]\pgf@y\advance\pgf@xa\pgf@x\midpointright\pgf@x\pgf@xa}}%
       \anchor{mid west}{\pgfpointadd{\leftcenter}{\radii\pgf@xa\pgf@x\linewidthleft\[email protected]\pgf@y\advance\pgf@xa\pgf@x\midpointleft\pgf@x-\pgf@xa}}%
       \anchor{base east}{\pgfpointadd{\rightcenter\pgf@y0pt}{\radii\pgf@xa\pgf@x\linewidthright\[email protected]\pgf@y\advance\pgf@x\pgf@xa\pgf@y0pt}}%
       \anchor{base west}{\pgfpointadd{\leftcenter\pgf@y0pt}{\radii\pgf@xa\pgf@x\linewidthleft\[email protected]\pgf@y\advance\pgf@xa\pgf@x\pgf@x-\pgf@xa\pgf@y0pt}}%
               %\anchor{mid west}{\radii\pgf@xa\pgf@x\centerleftgapside\advance\pgf@x-\pgf@xa}
       \anchor{base}{\basepoint}
       \anchor{north}{\pgfpointadd{\globalcenterpoint}{\linewidthatwidestcenter\pgf@ya\pgf@y\radii\advance\[email protected]\pgf@ya\[email protected]}}%
       \anchor{south}{\pgfpointadd{\globalcenterpoint}{\linewidthatwidestcenter\pgf@ya\pgf@y\radii\pgf@y-\pgf@y\advance\[email protected]\pgf@ya\pgf@x0pt}}%
       \anchor{east}{\pgfpointadd{\rightcenter}{\radii\pgf@xa\pgf@x\linewidthright\[email protected]\pgf@y\advance\pgf@x\pgf@xa\pgf@y0pt}}%
       \anchor{west}{\pgfpointadd{\leftcenter}{\radii\pgf@xa-\pgf@x\linewidthleft\[email protected]\pgf@y\advance\pgf@x\pgf@xa\pgf@y0pt}}%
       \anchor{north west}{\pgfpointadd{\leftcenter}{\linewidthleft\[email protected]\pgf@y%
                 \radii\advance\pgf@x\pgf@xa\advance\pgf@y\pgf@xa%
                 \[email protected]\pgf@x\[email protected]\pgf@y}}%
       \anchor{south west}{\pgfpointadd{\leftcenter}{\linewidthleft\[email protected]\pgf@y%
                 \radii\advance\pgf@x\pgf@xa\advance\pgf@y\pgf@xa%
                 \[email protected]\pgf@x\[email protected]\pgf@y}}%
       \anchor{north east}{\pgfpointadd{\rightcenter}{\linewidthright\[email protected]\pgf@y%
                 \radii\advance\pgf@x\pgf@xa\advance\pgf@y\pgf@xa%
                 \[email protected]\pgf@x\[email protected]\pgf@y}}%
       \anchor{south east}{\pgfpointadd{\rightcenter}{\linewidthright\[email protected]\pgf@y%
                 \radii\advance\pgf@x\pgf@xa\advance\pgf@y\pgf@xa%
                 \[email protected]\pgf@x\[email protected]\pgf@y}}%
%%%%%%%%% START OF DRAWING VSPLIT
%%%%% Left
\beforebackgroundpath{%
        \edef\defaultpgflinewidth{\the\pgflinewidth}% store default line width
         \pgfsetstrokecolor{\leftcolor}%
          \pgfsetfillcolor{\leftfillcolor}%
        % \expandafter\pgfsetstrokecolor\expandafter{\pgfkeysvalueof{/tikz/swig vsplit/linecolorleft}}%
                \expandafter\pgfsetlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig vsplit/line width left}}%
                      \expandafter\pgfsetinnerlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig vsplit/inner line width left}}%
               \radii%
               \pgfmathaddtolength\pgf@x{-\pgfkeysvalueof{/pgf/outer xsep}}%
               \pgfmathaddtolength\pgf@y{-\pgfkeysvalueof{/pgf/outer ysep}}%
               \pgfutil@tempdima\pgf@x%
               \pgfutil@tempdimb\pgf@y%
               \pgf@ya\pgf@y%
               \pgfmathsetlength\pgf@ya{\pgf@ya*(sin(\vsplitangle))}%% compute y distance for off-center split
               \pgfpathmoveto{\centerleftgapside\advance\pgf@y\pgf@ya}% set path to centerpoint + \pgf@ya
               \pgfpatharcaxes{\vsplitangle}{360-\vsplitangle}{\pgfpoint{\the\pgfutil@tempdima}{0pt}}{\pgfpoint{0pt}{\the\pgfutil@tempdimb}}%
               \pgfpathclose
               \pgfusepath{stroke,fill}
%%%%%% right
    \pgfsetlinewidth\defaultpgflinewidth % Reset \the\pgflinewidth to default value (in case changed while drawing left)
                \pgfsetstrokecolor{\rightcolor}%
                \pgfsetfillcolor{\rightfillcolor}%
                   \expandafter\pgfsetlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig vsplit/line width right}}%
                   \expandafter\pgfsetinnerlinewidth\expandafter{\pgfkeysvalueof{/tikz/swig vsplit/inner line width right}}%
               \radii%
               \pgfmathaddtolength\pgf@x{-\pgfkeysvalueof{/pgf/outer xsep}}%
               \pgfmathaddtolength\pgf@y{-\pgfkeysvalueof{/pgf/outer ysep}}%
               \pgfutil@tempdima\pgf@x%
               \pgfutil@tempdimb\pgf@y%
               \pgf@ya\pgf@y%
               \pgfmathsetlength\pgf@yb{\pgf@ya*(sin(\vsplitangle))}%% compute y distance for off-center split
               \pgfpathmoveto{\centerleftgapside\pgf@xa\pgf@x\pgf@ya\pgf@y\advance\pgf@ya\pgf@yb%
               \gap\advance\pgf@xa\pgf@x%
               \pgf@x\pgf@xa\pgf@y\pgf@ya%
               }%
               \pgfpatharcaxes{\vsplitangle}{-\vsplitangle}{\pgfpoint{\the\pgfutil@tempdima}{0pt}}{\pgfpoint{0pt}{\the\pgfutil@tempdimb}}%
               \pgfpathclose%
               \pgfusepath{stroke,fill}%
       }
       \anchorborder{%
       \pgfextract@process\externalpoint{}%  %https://tex.stackexchange.com/questions/255492/storing-a-pgfpoint-for-repeated-use
       %%%%%   This stores the current \pgf@x and \pgf@y in the macro \externalpoint
       \linewidthleft%
       \pgf@ya\pgf@y%
               \radii%
       \advance\[email protected]\pgf@ya% add half-line width to x radius
       \advance\[email protected]\pgf@ya% add half line width to y radius
       \edef\pgf@marshal{%
               \noexpand\pgfpointadd{\noexpand\pgfpointborderellipse{\noexpand\externalpoint}%
                       {\noexpand\pgfpoint{\the\pgf@x}{\the\pgf@y}}}{\noexpand\leftcenter}%
       }%
       \pgf@marshal%
       \pgf@xa\pgf@x% store the border point
       \pgf@ya\pgf@y% store the border point
       \centerleftgapside%
       \pgf@xb\pgf@x% point on gap
       \ifdim\pgf@xa>\pgf@xb%
               \linewidthright%
               \pgf@ya\pgf@y%
               \radii%
               \advance\[email protected]\pgf@ya% add half-line width to x radius
               \advance\[email protected]\pgf@ya% add half line width to y radius
               \edef\pgf@marshal{%
                       \noexpand\pgfpointadd{\noexpand\pgfpointborderellipse{\noexpand\externalpoint}%
                               {\noexpand\pgfpoint{\the\pgf@x}{\the\pgf@y}}}{\noexpand\rightcenter}%
       }%
       \pgf@marshal%
       \else
       \pgf@x\pgf@xa%
       \pgf@y\pgf@ya%
       \fi%
 }%
}


\endinput

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