flowchart (18feb13)

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+% \iffalse meta-comment
+%
+% Flowchart 3.2
+% 28 January 2013
+%
+% flowchart.dtx
+%
+%    Documented LaTeX file for the flowchart package.
+%
+%    Run LaTeX on flowchart.ini to make the package's
+%    flowchart.sty file.
+%
+%    Run LaTeX on this file to produce the package 
+%    documentation.
+%
+% The flowchart package is an outcome of the Fluxion 
+% project.
+%
+% Copyright (C) 2013 by Adrian P Robson
+%     adrian.robson@nepsweb.co.uk
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either 
+% version 1.3c of this license or (at your option) any later
+% version. The latest version of this license is in
+%    http://www.latex-project.org/lppl.txt
+%
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Adrian Robson.
+%
+% This work consists of the files flowchart.dtx and 
+%                                 flowchart.ins
+% and the derived files           flowchart.sty and 
+%                                 flowchart.pdf
+% -----------------------------------------------------------
+% \fi
+%
+% \iffalse
+%<package>\NeedsTeXFormat{LaTeX2e}[2011/06/27]
+%<package>\ProvidesPackage{flowchart}
+%<package>[2013/01/28 3.2 Flowchart shapes for TikZ]
+%<*driver>
+\documentclass[10pt,a4paper]{ltxdoc}
+
+\usepackage{flowchart}
+\usetikzlibrary{arrows}
+
+\usepackage[T1]{fontenc}
+\usepackage{lmodern}
+\usepackage{textcomp}
+
+\usepackage{fancyvrb}
+\usepackage{enumitem}
+\usepackage{url}
+\usepackage{array}
+
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+%\OnlyDescription       % comment out for code implementation
+
+\newcommand{\mnote}[1]
+{\marginpar{\scriptsize \raggedright #1 }}
+
+\def\tikzname{Ti\emph{k}Z} 
+
+\begin{document}
+\DocInput{flowchart.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+%^^A-------------------------------------------------------------------
+%^^A     Change log...
+%^^A-------------------------------------------------------------------
+%^^A
+%^^A 27 January 2013
+%^^A Original
+%    \changes{v3.1}{2014/01/27}{
+%       The package name is changed from 'fluxion' to 'flowchart'.
+%       It replaces version 2.4 of the package.
+%       This is a significant rewrite of the package to use the 
+%       new version 2.1 of Silhouette (makeshape.sty).
+%       An improved terminal shape has been written.
+%       The decide shape has been renamed decision.
+%       The user guide has been extended and clarified.
+%       Installation has been converted to dtx format, and the 
+%       flowchart.sty is generated by the flowchart.ins file.
+%    }
+%^^A
+%^^A 28 January 2013
+%^^A Original
+%    \changes{v3.2}{2014/01/28}{
+%       The decision shape was replaced a better shape that does 
+%       not have an outer separation problem.
+%    }
+%^^A
+%^^A-------------------------------------------------------------------
+% 
+% \CheckSum{0} ^^A no checksum for development
+%^^A \CheckSum{59}
+% \CharacterTable
+%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%   Digits        \0\1\2\3\4\5\6\7\8\9
+%   Exclamation   \!     Double quote  \"     Hash (number) \#
+%   Dollar        \$     Percent       \%     Ampersand     \&
+%   Acute accent  \'     Left paren    \(     Right paren   \)
+%   Asterisk      \*     Plus          \+     Comma         \,
+%   Minus         \-     Point         \.     Solidus       \/
+%   Colon         \:     Semicolon     \;     Less than     \<
+%   Equals        \=     Greater than  \>     Question mark \?
+%   Commercial at \@     Left bracket  \[     Backslash     \\
+%   Right bracket \]     Circumflex    \^     Underscore    \_
+%   Grave accent  \`     Left brace    \{     Vertical bar  \|
+%   Right brace   \}     Tilde         \~}
+%
+% \GetFileInfo{flowchart.sty}
+%
+% \title{The {\tt flowchart} package\thanks{
+%    This document corresponds to \textsf{flowchart}~\fileversion, 
+%    dated~\filedate.}\\[0.5ex] 
+% Flowchart Shapes for \tikzname}
+%
+% \author{Adrian P. Robson\thanks{\texttt{adrian.robson@nepsweb.co.uk}}}
+% \date{28 January 2013}
+%
+% \maketitle
+%
+%^^A \tableofcontents
+% 
+%^^A-------------------------------------------------------------------
+%^^A     Start report body
+%^^A-------------------------------------------------------------------
+%
+% \section{Introduction}
+%
+% This package provides shapes for drawing program flowcharts.
+% They are based on the classic \emph{IBM Flowcharting Template}, 
+% which conforms to ISO~1028:1973, with some IBM extensions. 
+% (this has since been revised by ISO 5807:1985).
+%
+% At the moment, there is only a limited selection of the standard symbols, 
+% but other symbols might be added in the future.
+%
+% This package requires that |makeshape| \cite{makeshape} and of course 
+% PGF/\tikzname{} \cite{pgfMan} are also installed .
+%
+% \section{The Symbols}\label{symbols}
+%
+% The package provides the following symbols as defined in the ISO standard:
+%
+% \def\colA{3.2cm}
+% \def\colB{8cm}
+%
+% \def\swide{2.8cm}
+% \def\pht{1.3cm}
+% \def\dht{1.8cm}
+% \def\ppht{\pht}
+% \def\sht{\pht}
+% \def\tht{0.75cm}
+%
+%^^A - process symbol
+% \vspace{3mm}
+% \noindent
+% \begin{tabular}{m{\colA} m{\colB}}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+% \node (process1) at (0,0) [draw, process,
+%    minimum width=\swide, 
+%    minimum height=\pht] {PROCESS}; %PROCESS
+% \end{tikzpicture}
+% & 
+% {\bf Process} -- Any processing function; or defined operations causing change in value, 
+%   form or location of information.\\
+% \end{tabular}
+% 
+%^^A - decision symbol
+% \vspace{3mm}
+% \noindent
+% \begin{tabular}{m{\colA} m{\colB}}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+% \node at (0,0) [draw, decision, %aspect=1.5,
+% minimum width=\swide, 
+% minimum height=\dht] {DECISION};
+% \end{tikzpicture}
+% & 
+% {\bf Decision} -- A decision or switching-type operation that determines 
+%    which of a number of alternative paths are followed.\\
+% \end{tabular}
+%
+%^^A - predefined process symbol
+% \vspace{5mm}
+% \noindent
+% \begin{tabular}{m{\colA} m{\colB}}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+% \node at (0,0) [draw, predproc, align=left,
+% minimum width=\swide, 
+% minimum height=\ppht] {Predefined\\
+%                        Process};
+% \end{tikzpicture}
+% & 
+% {\bf Predefined Process} -- One or more named operations or program steps specified 
+%    in a subroutine or another set of flowcharts.\\
+% \end{tabular}
+%
+%^^A - storage symbol
+% \vspace{5mm}
+% \noindent
+% \begin{tabular}{m{\colA} m{\colB}}
+% \hspace*{-1.85mm}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+% \node at (0,0) [draw, storage,
+%    minimum width=\swide, 
+%    minimum height=\sht] {STORAGE};
+% \end{tikzpicture}
+% & 
+% {\bf Storage} -- Input or output using any kind of online storage.\\
+%
+% \end{tabular}
+%
+%^^A - terminal symbol
+% \vspace{4mm}
+% \noindent
+% \begin{tabular}{m{\colA} m{\colB}}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+% \node at (0,0) [ draw, terminal,
+% minimum width=\swide, 
+% minimum height=\tht] {TERMINAL};
+% \end{tikzpicture}
+% & 
+% {\bf Terminal} -- A terminal point in a flowchart: start, stop, halt delay or interrupt. 
+%    It may show exit from a closed subroutine.\\
+% \end{tabular}
+%
+% \section{Usage} 
+%
+% The example below uses all of the symbols given in \S\ref{symbols}, 
+% and shows how they can be laid out and connected with \tikzname: 
+%
+% \begin{center}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+%
+% \def\smbwd{2cm}
+%
+% \node (terminal1) at (0,0) [draw, terminal,
+%    minimum width=\smbwd,
+%    minimum height=0.5cm] {START};
+%
+% \node (predproc1) at (0,-1.5) [draw, predproc, align=left,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {GET\\ DATA};
+%
+% \node (decide1) at (0,-3.5) [draw, decision,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {C$<$3};
+%
+% \node (storage1) at (0,-5.5) [draw, storage,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {STORE};
+%
+% \node (process1) at (3,-5.5) [draw, process,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {PROCESS};
+%
+% \coordinate (point1) at (0,-6.75);
+%
+% \node (terminal2) at (0,-7.75) [draw, terminal, 
+%    minimum width=\smbwd, 
+%    minimum height=0.5cm] {END};
+%
+% \draw[->] (terminal1) -- (predproc1); 
+% \draw[->] (predproc1) -- (decide1); 
+% \draw[->] (decide1) -| node[above]{YES} (process1); 
+% \draw[->] (decide1) -- (storage1); 
+% \draw[->] (process1) |- (point1); 
+% \draw[->] (storage1) -- (point1) -- (terminal2); 
+%
+% \end{tikzpicture}
+% \end{center}
+%
+% It needs the following in the document's preamble: 
+%
+% \begin{VerbatimOut}[gobble=5]{\jobname.tmp}
+%    \usepackage{flowchart}
+%    \usetikzlibrary{arrows}
+% \end{VerbatimOut}
+% \VerbatimInput[]{\jobname.tmp}
+%
+% \noindent
+% The \tikzname{} package is included in |flowchart|, so it does not have to be explicitly loaded.
+% However, any |\usetikzlibrary| commands that are needed must be placed after 
+% |\loadpackage{flowchart}|.
+%
+% The flowchart above is produced by the following |tikzpicture| environment:
+%
+% \begin{VerbatimOut}[gobble=1]{\jobname.tmp}
+% \begin{tikzpicture}[>=latex',font={\sf \small}]
+%
+% \def\smbwd{2cm}
+%
+% \node (terminal1) at (0,0) [draw, terminal,
+%    minimum width=\smbwd,
+%    minimum height=0.5cm] {START};
+%
+% \node (predproc1) at (0,-1.5) [draw, predproc, align=left,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {GET\\ DATA};
+%
+% \node (decide1) at (0,-3.5) [draw, decision
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {C$<$3};
+%
+% \node (storage1) at (0,-5.5) [draw, storage,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {STORE};
+%
+% \node (process1) at (3,-5.5) [draw, process,
+%    minimum width=\smbwd, 
+%    minimum height=1cm] {PROCESS};
+%
+% \coordinate (point1) at (0,-6.75);
+%
+% \node (terminal2) at (0,-7.75) [draw, terminal, 
+%    minimum width=\smbwd, 
+%    minimum height=0.5cm] {END};
+%
+% \draw[->] (terminal1) -- (predproc1); 
+% \draw[->] (predproc1) -- (decide1); 
+% \draw[->] (decide1) -| node[above]{YES} (process1); 
+% \draw[->] (decide1) -- (storage1); 
+% \draw[->] (process1) |- (point1); 
+% \draw[->] (storage1) -- (point1) -- (terminal2); 
+%
+% \end{tikzpicture}
+% \end{VerbatimOut}
+% \VerbatimInput[numbers=left]{\jobname.tmp}
+%
+% \subsection{Symbols}
+%
+% The flow chart symbols are created as nodes, as shown in lines 5-7, 
+% which defines a |terminal| shape.
+% The minimum dimension keys should be used to create consistently sized symbols.
+% In particular, a defined value should be used for the width in all symbols.
+% So |\smbwd| is defined on line 3, and used in lines 6, 10, 14, 18, 22, and 28.
+%
+% \subsection{Layout}
+%
+% In this example, we have used absolute coordinates to position the diagram's nodes.
+% This works well for small flowcharts, but relative positioning might be better for larger diagrams.
+%
+% \subsection{Connectors}
+%
+% The shapes are connected by drawing lines between them as shown in lines 31-36 of the example. 
+% Here, unqualified node names are used, 
+% but explicit anchor names such as |(nodename.north east)| could be used instead.
+%
+% It can sometimes be convenient to place a connector at an arbitrary point on a shape.
+% The |(nodename.45)| notation achieves this, where the number gives the angle from the centre of the 
+% shape to the connecting point on its boundary.
+%
+% Right angled connections are traditionally used in flowcharts, and these are created with 
+% the \verb+-|+ and \verb+|-+ notations shown in lines 33 and 35 of the example.
+%
+% Joining connectors is best done by declaring a named coordinate, and using it as the meeting point.
+% In the example, a coordinate called |point1| is declared on line 25, 
+% and then used in line 35 and 36 % to connect |process1| and |storage1| to |terminal2|.
+%
+%^^A-------------------------------------------------------------------
+%^^A                            References
+%^^A-------------------------------------------------------------------
+%
+% \def\mybib{
+%   \begin{thebibliography}{9}
+%     \raggedright
+%     \bibitem{makeshape}
+%       Adrian P. Robson,
+%      \emph{The makeshape package
+%       and a method for creating custom shapes in PGF}, 2013.
+%       Available as {\tt makeshape.pdf} from \url{ctan.org}.
+%     \bibitem{pgfMan}
+%       Till Tantau, 
+%       \emph{The TikZ and PGF Packages, Manual for version 2.10}, 
+%       2010.
+%       Available as {\tt pgfmanual.pdf} from \url{ctan.org}.
+%   \end{thebibliography}
+% }
+%
+%^^A-------------------------------------------------------------------
+%^^A     Start code implementation
+%^^A-------------------------------------------------------------------
+%
+% \StopEventually{\mybib}
+%^^A \StopEventually{\mybib \PrintChanges}
+%^^A    -> Run pdfLaTeX flowchart.dtx
+%^^A           makeindex -s gglo.ist -o flowchart.gls flowchart.glo
+%^^A           pdfLaTeX flowchart.dtx
+%
+% \section{Implementation}
+%
+% The implementation of |flowchart.sty| uses the |makeshape| package, 
+% which provides support for custom PGF shapes. 
+% With this, we have only have to create boundary and anchor path macros, 
+% and anchor points for each shape. 
+%
+% There are three pairs of keys that have to be accommodated by PGF shapes:
+% inner and outer separation, and minimum dimensions.
+% The |makeshape| package has corrected text box macros |\ctbnex| and |\ctbney|, 
+% which automatically handle inner separation; 
+% and the PGF keys |\pgfshapeouterxsep|, |\pgfshapeouterysep|, |\pgfshapeminheight| and 
+% |\pgfshapeminwidth|, which give the outer separation and minimum dimensions of the shape.
+%
+% \subsection{Preamble}
+% The |makeshape| package provides the |tikz| package. However, the |shapes| library is also needed:
+%
+%    \begin{macrocode}
+\RequirePackage{makeshape}
+\RequirePackage{tikz}
+\usetikzlibrary{shapes}
+%    \end{macrocode}
+%
+%^^A ************************************************************
+%^^A * Predefined Process shape starts
+%^^A ************************************************************
+% \subsection{Predproc Shape}
+%
+% This is the Predefined Process symbol.
+%
+% \subsubsection{Anchor and background paths}\label{predprocpaths}
+%
+%
+% These macros define the paths that are used by the |makeshape| |setpaths| command in 
+% the shape's |\pgfdeclareshape| macro, which is described in \S\ref{predprocShape}.
+%
+% \begin{macro}{\band}
+%    The shape's side band size is an internal constant:
+%    \begin{macrocode}
+\def\band{10pt}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\predprocAnchorpath}
+%    The |\predprocAnchorpath| macro defines the shape's \emph{anchor path}. 
+%    It `draws' the path on which the shape's calculated anchor points lay.
+%    It is very similar to first part of |\predproc@shape| that draws the outer path, 
+%    but it corrects for outer separation and does not draw any side bands.
+%    \begin{macrocode}
+\def\predprocAnchorpath{
+%    \end{macrocode}
+%
+%    First, get the corrected text box's NE corner using |\ctbnex| and |\ctbney|, 
+%    then make room for the side band.
+%    \begin{macrocode}
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+   \advance\pgf@xa by \band
+%    \end{macrocode}
+%    Correct for minimum dimensions and outer separation:
+%    \begin{macrocode}
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \advance\pgf@xa\pgfshapeouterxsep
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+   \advance\pgf@ya\pgfshapeouterysep
+%    \end{macrocode}
+%
+%    Finally, draw the anchor path, which is a rectangle,  
+%    using the values in |\pgf@xa| and |\pgf@ya| that were calculated above:
+%    \begin{macrocode}
+   \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{\pgf@xa}{-\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{-\pgf@xa}{-\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{-\pgf@xa}{\pgf@ya}}
+   \pgfpathclose
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\predprocBackground}
+%     The |\predprocBackground| macro draws the shape's path, including its side band.
+%     It is used in the shape's |\backgroundpath| macro.
+%    \begin{macrocode}
+\def\predprocBackground{
+%    \end{macrocode}
+%
+%    First, get the corrected text box's NE corner using |\ctbnex| and |\ctbney|, 
+%    then make room for the side band.
+%    \begin{macrocode}
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+   \advance\pgf@xa by \band
+%    \end{macrocode}
+%    Correct for minimum dimensions but \emph{do not add} outer separation:
+%    \begin{macrocode}
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+%    \end{macrocode}
+%
+%    Finally, draw the outer shape, which is a rectangle, 
+%    using the values in |\pgf@xa| and |\pgf@ya| that were calculated above:
+%    \begin{macrocode}
+   \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{\pgf@xa}{-\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{-\pgf@xa}{-\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{-\pgf@xa}{\pgf@ya}}
+   \pgfpathclose
+%    \end{macrocode}
+%
+%    Finally, we draw the inner shape, which completes the shape with its side bands.
+%    The x-coordinate is aligned on the right side band position, then the side bands are drawn:
+%    \begin{macrocode}
+   \advance\pgf@xa by -\band
+   \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{\pgf@xa}{-\pgf@ya}}
+   \pgfpathmoveto{\pgfpoint{-\pgf@xa}{\pgf@ya}}
+   \pgfpathlineto{\pgfpoint{-\pgf@xa}{-\pgf@ya}}
+}
+%    \end{macrocode}
+% \end{macro}
+%
+%
+% \subsubsection{Predproc shape declaration}\label{predprocShape}
+%
+% \begin{macro}{\pgfdeclareshape}
+% \begin{macro}{predproc}
+%    This is the |\pgfdeclareshape| declaration for the |predproc| shape. 
+%    \begin{macrocode}
+\pgfdeclareshape{predproc}{
+%    \end{macrocode}
+% The path macros defined in \S\ref{predprocpaths} are used as follows
+% with the |setpaths| command provided by the |makeshape| package to draw the 
+% shape and make boundary intersection calculations.
+%    \begin{macrocode}
+   \setpaths{\predprocAnchorpath}{\predprocBackground}
+%    \end{macrocode}
+%
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\northeast}
+% The |\northeast| saved anchor is used to define the position of the NE corner of the shape.
+% The calculation is similar that used in the anchor path described in \S\ref{predprocpaths},
+% and corrects for inner and outer separation, and minimum dimensions.
+% It returns the coordinates of the point in |\pgf@x| and |\pgf@y|.
+%    \begin{macrocode}
+   \savedanchor{\northeast}{
+      \pgf@x = \ctbnex
+      \advance\pgf@x by \band
+      \mincorrect{\pgf@x}{\pgfshapeminwidth}
+      \advance\pgf@x\pgfshapeouterxsep
+      \pgf@y = \ctbney
+      \mincorrect{\pgf@y}{\pgfshapeminheight}
+      \advance\pgf@y\pgfshapeouterysep
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\anchor}
+% \begin{macro}{north}
+% \begin{macro}{north east}
+% \begin{macro}{east}
+% \begin{macro}{south east}
+% \begin{macro}{south}
+% \begin{macro}{south west}
+% \begin{macro}{west}
+% \begin{macro}{north west}
+%    There are some standard anchors, which  
+%    are all based on the |\northeast| saved anchor:
+%    \begin{macrocode}
+   \anchor{north}{ \northeast \pgf@x=0pt }
+   \anchor{north east}{ \northeast }
+   \anchor{east}{ \northeast \pgf@y=0pt }
+   \anchor{south east}{ \northeast \pgf@y=-\pgf@y }
+   \anchor{south}{ \northeast \pgf@x=0pt \pgf@y=-\pgf@y }
+   \anchor{south west}{ \northeast \pgf@x=-\pgf@x \pgf@y=-\pgf@y }
+   \anchor{west}{ \northeast \pgf@x=-\pgf@x \pgf@y=0pt }
+   \anchor{north west}{ \northeast \pgf@x=-\pgf@x }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+% \end{macro} ^^A end predproc 
+% \end{macro} ^^A end \pgfdeclareshape
+%
+%^^A ************************************************************
+%^^A * Predefined Process shape ends
+%^^A ************************************************************
+%
+%^^A ************************************************************
+%^^A *   Storage shape starts
+%^^A ************************************************************
+% \subsection{Storage Shape}
+%
+% \subsubsection{Support Macros}
+%
+% \begin{macro}{\storagepath}
+%    The |storage| shape's background path is defined in |\storagepath|. 
+%    It requires the following register to be set:
+%
+%    \begin{tabular}{ll}
+%     |\pgf@x|  & x coordinate of NE corner excluding outer separation\\
+%     |\pgf@y|  & y coordinate of NE corner excluding outer separation\\
+%     |\pgf@xc| & arc offset for y coordinate 
+%    \end{tabular}
+%
+%\medskip
+% The NE corner is stored in |\pgf@xa| and |\pgf@ya| and
+% and the SW corner is put in |\pgf@xb| and |\pgf@yb|.
+% The SW x-coordinate has to be moved right by the arc offset to compensate for the 
+% curve of the shapes west side.  
+%    \begin{macrocode}
+\def\storagepath{
+   \pgf@xa=\pgf@x \pgf@ya=\pgf@y
+   \pgf@xb=-\pgf@xa \pgf@yb=-\pgf@ya
+   \advance\pgf@xb by \pgf@xc
+%    \end{macrocode}
+%    The shape is drawn from its SW corner moving counter clockwise.
+%    The radius for the arcs is the height.
+%    \begin{macrocode}
+   \pgfpathmoveto{\pgfpoint{\pgf@xb}{\pgf@yb}}
+   \pgfpatharc{210}{150}{2*\pgf@ya} 
+   \pgfpathlineto{\pgfpoint{\pgf@xa}{\pgf@ya}}
+   \pgfpatharc{150}{210}{2*\pgf@ya}
+   \pgfpathclose
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\arcoffset}
+%    The |storage| shape's arc offset is calculated by the |\arcoffset| macro.
+%    The required arc offset is $b$, and the shape's height is  $h$ in the diagram below. 
+%    \medskip
+% 
+%    \begin{tabular}{cc}
+%      \begin{tikzpicture}
+%         \def\sht{4cm}
+%         \def\oset{0.536cm}
+%         \def\a{\sht+\oset}
+%         \draw[] (0,0) -- (-\sht,0);
+%         \draw[] (-\sht,0) arc (0:40:-\sht); 
+%         \draw[] (-\sht,0) arc (180:140:\sht); 
+%         \draw[] (-\a,-\sht*0.5) -- (-\a,\sht*0.5);
+%         \draw[] (-\a,\sht*0.5) -- (0,0);
+%         \draw[] (-\a,\sht*0.5) -- ++(-1,0);
+%         \draw[] (-\a,-\sht*0.5) -- ++(-1,0);
+%         \node at (-2cm,1.5cm) [] {$h$};
+%         \node at (-3.1cm,0.7cm) [] {$h/2$};
+%         \node at (-2cm,-0.2cm) [] {$a$};
+%         \node at (-3.7cm,-0.2cm) [] {$b$};
+%     \end{tikzpicture}
+%    &
+%    \begin{minipage}[b]{6.5cm}
+%      \begin{eqnarray}
+%         h^2 &=& a^2 + \left(\frac{h}{2}\right)^2 \nonumber\\[3pt]
+%         a^2 &=& h^2 - \frac{h^2}{4} = \frac{3h^2}{4} \nonumber\\[2pt]
+%           a &=& h \sqrt{3/4}\\[2ex]
+%           b &=& h - a = h - h \sqrt{3/4}  \nonumber\\[2pt]
+%             &=& h(1 - \sqrt{3/4}) \approx 0.134h \label{equoffset} \\\nonumber
+%      \end{eqnarray}
+%    \end{minipage}
+%    \end{tabular}
+% 
+%    \bigskip
+%    \noindent
+%    The macro's parameters are:
+%
+%    \begin{tabular}{ll}
+%      |#1|  & the calculated arc offset\\
+%      |#2|  & half the height\\
+%    \end{tabular}
+%
+%    \medskip\noindent
+%    Equation \ref{equoffset} given above is implemented as follows:
+%    \begin{macrocode}
+\def\arcoffset#1#2{
+   \pgfmathsetlength#1{0.134*2*#2}
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\storageParams}
+%    The |\storageParams| macro calculates reference values for the shape 
+%    with no outer separation.
+%    The following have values assigned after it is called:
+%
+%    \begin{tabular}{ll}
+%     |\pgf@x|  & x-coordinate of NE corner excluding outer separation\\
+%     |\pgf@y|  & y-coordinate of NE corner excluding outer separation\\
+%     |\pgf@xc| & arc offset for y-coordinate 
+%    \end{tabular}
+%
+% \medskip
+%   First get the shape's corrected text box:
+%    \begin{macrocode}
+\def\storageParams{
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+%    \end{macrocode}
+%    Correct for minimum height but not for outer separation.
+%    \begin{macrocode}
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+%    \end{macrocode}
+%    Calculate the room needed for the side arc, which is one of the macro's outputs, 
+%    and use it to change the x-coordinate:
+%    \begin{macrocode}
+   \arcoffset{\pgf@xc}{\pgf@ya}
+   \advance\pgf@xa by \pgf@xc
+%    \end{macrocode}
+%    Finally, correct for minimum width and set the output registers:
+%    \begin{macrocode}
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \pgf@x=\pgf@xa
+   \pgf@y=\pgf@ya
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\storageParamsOuter}
+%    The |\storageParamsOuter| macro calculates reference values for the shape 
+%    with its outer separation included.
+%    The following have values assigned after it is called:
+%    \begin{tabular}{ll}
+%     |\pgf@x|  & x coordinate of NE corner including outer separation\\
+%     |\pgf@y|  & y coordinate of NE corner including outer separation\\
+%     |\pgf@xc| & arc offset for y coordinate 
+%    \end{tabular}
+%
+%    \medskip
+%    Its implementation has a lot in common with |\storageParams|.
+%    First, get the NE corner of the corrected text box:
+%    \begin{macrocode}
+\def\storageParamsOuter{
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+%    \end{macrocode}
+%    Correct for minimum height and outer separation:
+%    \begin{macrocode}
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+   \advance\pgf@ya\pgfshapeouterysep
+%    \end{macrocode}
+%    Calculate the arc offset, which is an output, and make room for the side curve:
+%    \begin{macrocode}
+   \arcoffset{\pgf@xc}{\pgf@ya}
+   \advance\pgf@xa by \pgf@xc
+%    \end{macrocode}
+%    Finally, correct for minimum width and outer separation. Then set the output registers:
+%    \begin{macrocode}
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \advance\pgf@xa\pgfshapeouterxsep
+   \pgf@x=\pgf@xa
+   \pgf@y=\pgf@ya
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Anchor and background paths}\label{storagepaths}
+%
+% The anchor and background path macros both use |\storagepath|, but with with different parameters.
+% The output registers of the macros |\storageParams| and |\storageParamsOuter|  
+% are compatible with the inputs of |\storagepath|.
+%
+% \begin{macro}{\storageAnchorpath}
+%    The |\storageAnchorpath| macro defines the shape's \emph{anchor path}. 
+%    It `draws' the path on which the shape's calculated anchor points lay.
+%    This is similar to the background path but it is corrected for outer separation 
+%    and minimum dimensions.
+%    \begin{macrocode}
+\def\storageAnchorpath{
+   \storageParamsOuter
+   \storagepath
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\storageBackground}
+%    The |\storageBackground| macro draws the path that is the outer boundary of the 
+%    |storage| shape. This excludes outer separation but corrects for minimum height and width.
+%    \begin{macrocode}
+\def\storageBackground{
+   \storageParams 
+   \storagepath
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Storage shape declaration}
+%
+% \begin{macro}{\pgfdeclareshape}
+% \begin{macro}{storage}
+%    This is the |\pgfdeclareshape| declaration for the |storage| shape. 
+%    \begin{macrocode}
+\pgfdeclareshape{storage}{
+%    \end{macrocode}
+% The path macros defined in \S\ref{storagepaths} are used 
+% with the |setpaths| command provided by the |makeshape| package to draw the 
+% shape and make boundary intersection calculations:
+%    \begin{macrocode}
+   \setpaths{\storageAnchorpath}{\storageBackground}
+%    \end{macrocode}
+%
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\northeast}
+% There are two saved anchors defined for the |storage| shape.
+% The |\northeast| saved anchor is used to define the position of the NE corner of the shape.
+% The calculation is similar that used in the anchor path described in \S\ref{storagepaths},
+% and corrects for inner and outer separation, and minimum dimensions.
+% It returns the coordinates of the point in |\pgf@x| and |\pgf@y|, 
+% and its implementation is trivial since |\storageParamsOuter| does the required work.
+%    \begin{macrocode}
+   \savedanchor{\northeast}{
+      \storageParamsOuter 
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\northeast}
+% The |\northeastArc| saved anchor is similar, but corrects for the arc offset.
+%
+%    \begin{macrocode}
+   \savedanchor{\northeastArc}{
+      \storageParamsOuter
+      \advance\pgf@x by -\pgf@xc
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% 
+% \begin{macro}{\anchor}
+% \begin{macro}{north}
+% \begin{macro}{north east}
+% \begin{macro}{east}
+% \begin{macro}{south east}
+% \begin{macro}{south}
+% \begin{macro}{south west}
+% \begin{macro}{west}
+% \begin{macro}{north west}
+%    The standard anchors are defined. 
+%    These are based on the |\northeast| and |\northeastArc| saved anchors:
+%    \begin{macrocode}
+   \anchor{north}{ \northeast \pgf@x=0pt }
+   \anchor{north east}{ \northeast }
+   \anchor{east}{ \northeastArc \pgf@y=0pt }
+   \anchor{south east}{ \northeast \pgf@y=-\pgf@y }
+   \anchor{south}{ \northeast \pgf@x=0pt \pgf@y=-\pgf@y }
+   \anchor{south west}{ \northeastArc \pgf@x=-\pgf@x \pgf@y=-\pgf@y }
+   \anchor{west}{ \northeast \pgf@x=-\pgf@x \pgf@y=0pt }
+   \anchor{north west}{ \northeastArc \pgf@x=-\pgf@x }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\anchor}
+% \begin{macro}{north}
+% \begin{macro}{north east}
+% \begin{macro}{east}
+%   Three additional anchors are defined that follow the shape's bounding rectangle. 
+%    \begin{macrocode}
+   \anchor{east r}{ \northeast \pgf@y=0pt }
+   \anchor{north west r}{ \northeast \pgf@x=-\pgf@x }
+   \anchor{south west r}{ \northeast \pgf@x=-\pgf@x \pgf@y=-\pgf@y }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+% \end{macro} ^^A end storage 
+% \end{macro} ^^A end \pgfdeclareshape
+%
+%^^A ************************************************************
+%^^A * Storage shape ends
+%^^A ************************************************************
+%
+%^^A ************************************************************
+%^^A * Process shape starts
+%^^A ************************************************************
+% \subsection{Process Shape}
+%
+% \begin{macro}{\pgfdeclareshape}
+% \begin{macro}{process}
+%    The {\tt process} shape is simply implemented  
+%    by inheriting relevant anchors and paths from the standard |rectangle| shape
+%    without any changes:
+%    \begin{macrocode}
+\pgfdeclareshape{process}{
+   \inheritsavedanchors[from=rectangle] 
+   \inheritanchor[from=rectangle]{center}
+   \inheritanchor[from=rectangle]{text}
+   \inheritanchor[from=rectangle]{north}
+   \inheritanchor[from=rectangle]{north east}
+   \inheritanchor[from=rectangle]{east}
+   \inheritanchor[from=rectangle]{south east}
+   \inheritanchor[from=rectangle]{south}
+   \inheritanchor[from=rectangle]{south west}
+   \inheritanchor[from=rectangle]{west}
+   \inheritanchor[from=rectangle]{north west}
+   \inheritbackgroundpath[from=rectangle]
+   \inheritanchorborder[from=rectangle]
+}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+%^^A ************************************************************
+%^^A * Process shape ends
+%^^A ************************************************************
+%
+%^^A ************************************************************
+%^^A * Decision shape starts
+%^^A ************************************************************
+% \subsection{Decision Shape}
+%
+% \subsubsection{Support Macros}
+%
+% Two macros |\decisionref| and |\decisionrefout| give a reference point for the |decision| shape.
+% The default shape is a rotated square which touches the corrected text box.
+% The location and calculation of the default reference point is illustrated below:
+%
+%    \begin{center}
+%      \begin{tikzpicture}
+%
+%         ^^A - Axis
+%         \draw [dotted] (0,0) -- +(3cm,0) -- +(-3cm,0)  +(0,3cm) -- +(0,-1cm);
+%
+%         ^^A - draw line
+%         \draw [] (0,2.5cm) -- (2.5cm,0);
+%
+%         ^^A East point
+%         \node at (3.4cm,-0.3cm) [] {$(0,x_t + y_t)$};
+%         \draw [] (2.5cm,0) circle (2pt);
+%
+%         ^^A North point
+%         \node at (-1cm,2.5cm) [] {$(y_t + x_t,0)$};
+%         \draw [] (0,2.5cm) circle (2pt);
+%         \node at (-0.6cm,1.8cm) [outer sep=-2pt] (angletxt) {$45^\circ$};          
+%         \node at (0.15cm,2.1cm) [coordinate] (anglepnt) {};
+%         \draw [->] (angletxt) -- (anglepnt);
+%
+%         ^^A Reference point
+%         \draw [dotted] (0,2.5cm) -- +(3,0);
+%         \draw [dotted] (2.5cm,0) -- +(0,3);
+%         \node at (3.7cm,2.7cm) [] {\sf \small reference point};
+%         \node at (3.9cm,2.2cm) [] {$(y_t+x_t,x_t+y_t)$};
+%         \draw (2.5cm,2.5cm) circle (2pt);
+%         \draw (2.5cm,2.5cm) -- +(4pt,0) -- +(-4pt,0) +(0,4pt) -- +(0,-4pt);
+%
+%         ^^A - Corrected text box
+%         \node at (-1.5cm,0.7cm) [] {\sf \small corrected text box};
+%         \node at (2.5cm,0.7cm) [rectangle,draw,fill,white,minimum height=12pt] {};
+%         \node at (2.6cm,0.7cm) [] {$(x_t,y_t)$};
+%         \draw [] (2cm,0.5cm) circle (2pt);
+%         \node at (0,0)
+%            [rectangle, draw,
+%             minimum width=4cm,
+%             minimum height=1cm,
+%            ] (ctb) {};
+%
+%     \end{tikzpicture}
+%    \end{center}
+%    \vspace{-2ex}
+%
+% \begin{macro}{\decisionrefout}
+%    The |\decisionrefout| macro gives a reference point on the bounding rectangle of 
+%    the |decision| shape.
+%    Inner and outer separation are included, and it is corrected for the shape's minimum dimensions. 
+%    On completion, the coordinates of the point are in |\pgf@xa| and |\pgf@ya|.
+%
+%    First, the coordinates of the corrected text box are put into some registers: 
+%    \begin{macrocode}
+\def\decisionrefout{
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+   \pgf@xb=\ctbnex
+   \pgf@yb=\ctbney
+%    \end{macrocode}
+%    The reference point's x-coordinates is calculated and corrected for minimum width, 
+%    and outer x-separation:
+%    \begin{macrocode}
+   \advance\pgf@xa by \pgf@yb
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \advance\pgf@xa by \pgfshapeouterxsep
+%    \end{macrocode}
+%    Then the calculation and correction is repeated for the y-coordinate:
+%    \begin{macrocode}
+   \advance\pgf@ya by \pgf@xb
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+   \advance\pgf@ya by \pgfshapeouterysep
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\decisionref}
+%    The |\decisionref| macro is almost the same as |\decisionrefout| 
+%    but has no correction for outer separation.
+%    Again, the coordinates of the point are in |\pgf@xa| and |\pgf@ya|  on completion:
+%    \begin{macrocode}
+\def\decisionref{
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+   \pgf@xb=\ctbnex
+   \pgf@yb=\ctbney
+   \advance\pgf@xa by \pgf@yb
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \advance\pgf@ya by \pgf@xb
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\decisionpath}
+%    The |\decisionpath| macro draws the |\decision| shape's path. 
+%    It expects the reference point coordinates to be in |\pgf@xa| and |\pgf@ya|. 
+%    The path is drawn clockwise starting at the top:
+%    \begin{macrocode}
+\def\decisionpath{
+   \def\refx{\pgf@xa}
+   \def\refy{\pgf@ya}
+   \pgfpathmoveto{\pgfpoint{0}{\refy}}
+   \pgfpathlineto{\pgfpoint{\refx}{0}}
+   \pgfpathlineto{\pgfpoint{0}{-\refy}}
+   \pgfpathlineto{\pgfpoint{-\refx}{0}}
+   \pgfpathclose
+}
+%    \end{macrocode}
+% \end{macro}
+%
+%\subsubsection{Anchor and background paths}\label{decisionpaths}
+%
+% \begin{macro}{\decisionanchor}
+% The |\decisionanchor| macro is the anchor path for the shape's |setpath|:
+%    \begin{macrocode}
+\def\decisionanchor{
+   \decisionrefout
+   \decisionpath
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\decisionborder}
+% The |\decisionborder| macro is the border path for the shape's |setpath|:
+%    \begin{macrocode}
+\def\decisionborder{
+   \decisionref
+   \decisionpath
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Decision shape declaration}
+%
+% \begin{macro}{\pgfdeclareshape}
+% \begin{macro}{decision}
+%    This is the |\pgfdeclareshape| declaration for the |decision| shape.
+%    \begin{macrocode}
+\pgfdeclareshape{decision}{
+%    \end{macrocode}
+% The path macros defined in \S\ref{terminalpaths} are used 
+% with the |setpaths| command provided by the |makeshape| package to draw the 
+% shape and make boundary intersection calculations:
+%    \begin{macrocode}
+   \setpaths{\decisionanchor}{\decisionborder}
+%    \end{macrocode}
+%
+% There are three saved anchors defined for the |decision| shape.
+% They have to correct for inner and outer separation, and minimum dimensions;
+% and return the coordinates of the point in |\pgf@x| and |\pgf@y|. 
+% However, this is simplified because |\decisionrefout| does the required work.
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\north}
+%    The |\north| saved anchor uses the y-coordinate of the reference point:
+%    \begin{macrocode}
+   \savedanchor{\north}{
+      \decisionrefout
+      \pgf@x = 0pt
+      \pgf@y = \pgf@ya
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\north}
+%    The |\east| saved anchor uses the x-coordinate of the reference point:
+%    \begin{macrocode}
+   \savedanchor{\east}{
+      \decisionrefout
+      \pgf@x = \pgf@xa
+      \pgf@y = 0pt
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\northeast}
+%    The |\northeast| saved anchor uses the both coordinates of the reference point to 
+%    calculate the required point:
+%    \begin{macrocode}
+   \savedanchor{\northeast}{
+      \decisionrefout
+      \divide\pgf@xa by 2
+      \divide\pgf@ya by 2
+      \pgf@x = \pgf@xa
+      \pgf@y = \pgf@ya
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\anchor}
+% \begin{macro}{north}
+% \begin{macro}{north east}
+% \begin{macro}{east}
+% \begin{macro}{south east}
+% \begin{macro}{south}
+% \begin{macro}{south west}
+% \begin{macro}{west}
+% \begin{macro}{north west}
+%    The standard anchors are defined. 
+%    These are based on the |\north| |\east| and |\northeast| saved anchors:
+%    \begin{macrocode}
+   \anchor{north}{ \north }
+   \anchor{north east}{ \northeast }
+   \anchor{east}{ \east }
+   \anchor{south east}{ \northeast \pgf@y=-\pgf@y }
+   \anchor{south}{ \north \pgf@y=-\pgf@y }
+   \anchor{south west}{ \northeast \pgf@x=-\pgf@x \pgf@y=-\pgf@y }
+   \anchor{west}{ \east \pgf@x=-\pgf@x }
+   \anchor{north west}{ \northeast \pgf@x=-\pgf@x }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+% \end{macro} ^^A end decision 
+% \end{macro} ^^A end \pgfdeclareshape
+%
+%^^A ************************************************************
+%^^A * Decision shape ends
+%^^A ************************************************************
+%
+%^^A ************************************************************
+%^^A * Terminal shape starts
+%^^A ************************************************************
+% \subsection{Terminal Shape}
+%
+% \subsubsection{Support Macros}
+%
+% Two macros |\terminalrefneout| and |\terminalrefne| give a reference point on the 
+% boundary surface of the |terminal| shape.
+%
+%    \begin{center}
+%      \begin{tikzpicture}
+%         ^^A - Axis
+%         \draw [dotted] (0,0) -- +(2cm,0) -- +(-2cm,0)  +(0,1cm) -- +(0,-1cm);
+%         ^^A - Terminal shape
+%         \node (terminal) at (0,0) [draw,terminal,minimum height=1cm, minimum width=3cm] {};
+%         ^^ A - Reference point
+%         \draw (terminal.north east) circle (2pt);
+%         \node at (1.7cm,0.8cm) [] {\sf \small reference point};
+%         \draw [dotted] (terminal.north east) -- +(0,-1.5cm) -- +(0,0.2cm);
+%     \end{tikzpicture}
+%    \end{center}
+%    \vspace{-2ex}
+%
+% \begin{macro}{\terminalrefneout}
+%    The |\terminalrefneout| macro gives a reference point on the boundary surface of 
+%    the |terminal| shape.
+%    Inner and outer separation are included, and it is corrected for the shape's minimum dimensions. 
+%    On completion, the coordinates of the point are in |\pgf@xa| and |\pgf@ya|.
+%
+%    First, the coordinates of the corrected text box are obtained, 
+%    and then the width of the rounded end is add to the x-coordinate to get the bounding
+%    dimensions:
+%    \begin{macrocode}
+\def\terminalrefneout{
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+   \advance\pgf@xa by \pgf@ya
+%    \end{macrocode}
+%    Then these bounding coordinates are corrected for minimum dimensions, and outer separation:
+%    \begin{macrocode}
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \advance\pgf@xa\pgfshapeouterxsep
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+   \advance\pgf@ya\pgfshapeouterysep
+%    \end{macrocode}
+%    Finally, the corrected x-coordinate is reduced by the width of the rounded end to give 
+%    the required reference point:
+%    \begin{macrocode}
+   \advance\pgf@xa by -\pgf@ya   
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\terminalrefne}
+%    The |\terminalrefne| macro is almost the same as |\terminalrefneout| 
+%    but has no correction for outer separation.
+%    Again, the coordinates of the point are in |\pgf@xa| and |\pgf@ya|  on completion:
+%    \begin{macrocode}
+\def\terminalrefne{
+   \pgf@xa=\ctbnex
+   \pgf@ya=\ctbney
+   \advance\pgf@xa by \pgf@ya
+   \mincorrect{\pgf@xa}{\pgfshapeminwidth}
+   \mincorrect{\pgf@ya}{\pgfshapeminheight}
+   \advance\pgf@xa by -\pgf@ya   
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\terminalpath}
+%    The |\terminalpath| macro draws the |terminal| shape's path. 
+%    It expects the reference point coordinates to be in |\pgf@xa| and |\pgf@ya|. 
+%    The path is drawn anticlockwise:
+%    \begin{macrocode}
+\def\terminalpath{
+   \def\refx{\pgf@xa}
+   \def\refy{\pgf@ya}
+   \def\radius{\refy}
+   \pgfpathmoveto{\pgfpoint{\refx}{\refy}}
+   \pgfpathlineto{\pgfpoint{-\refx}{\refy}}
+   \pgfpatharc{90}{270}{\radius}
+   \pgfpathlineto{\pgfpoint{\refx}{-\refy}}
+   \pgfpatharc{270}{360}{\radius}
+   \pgfpatharc{0}{90}{\radius}
+   \pgfpathclose
+}
+%    \end{macrocode}
+% \end{macro}
+%
+%\subsubsection{Anchor and background paths}\label{terminalpaths}
+%
+% \begin{macro}{\terminalanchor}
+% The |\terminalanchor| macro is the anchor path for the shape's |setpath|:
+%    \begin{macrocode}
+\def\terminalanchor{
+   \terminalrefneout
+   \terminalpath
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\terminalborder}
+% The |\terminalborder| macro is the border path for the shape's |setpath|:
+%    \begin{macrocode}
+\def\terminalborder{
+   \terminalrefne
+   \terminalpath
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Terminal shape declaration}
+%
+% \begin{macro}{\pgfdeclareshape}
+% \begin{macro}{terminal}
+%    This is the |\pgfdeclareshape| declaration for the |terminal| shape.
+%    \begin{macrocode}
+\pgfdeclareshape{terminal}{
+%    \end{macrocode}
+% The path macros defined in \S\ref{terminalpaths} are used 
+% with the |setpaths| command provided by the |makeshape| package to draw the 
+% shape and make boundary intersection calculations:
+%    \begin{macrocode}
+   \setpaths{\terminalanchor}{\terminalborder} 
+%    \end{macrocode}
+%
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\northeast}
+%    There are two saved anchors defined for the |terminal| shape.
+%    The |\northeast| saved anchor gives the position of the shape's `reference point' used above.
+%    It corrects for inner and outer separation, and minimum dimensions.
+%    It returns the coordinates of the point in |\pgf@x| and |\pgf@y|, 
+%    and its implementation is simple since |\terminalrefneout| does the required work. 
+%    \begin{macrocode}
+   \savedanchor{\northeast}{
+      \terminalrefneout
+      \pgf@x = \pgf@xa
+      \pgf@y = \pgf@ya
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\savedanchor}
+% \begin{macro}{\northeastBB}
+%    The |\northeastBB| macro gives the coordinates of the NE corner of the shape's 
+%    bounding rectangle in |\pgf@x| and |\pgf@y|. 
+%    It corrects for inner and outer separation, and minimum dimensions.
+%    It is obtain by adding the width of the shape's round end to the x-coordinate of the 
+%    reference point:
+%    \begin{macrocode}
+   \savedanchor{\northeastBB}{
+      \terminalrefneout
+      \advance \pgf@xa by \pgf@ya
+      \pgf@x = \pgf@xa
+      \pgf@y = \pgf@ya
+   }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\anchor}
+% \begin{macro}{north}
+% \begin{macro}{north east}
+% \begin{macro}{east}
+% \begin{macro}{south east}
+% \begin{macro}{south}
+% \begin{macro}{south west}
+% \begin{macro}{west}
+% \begin{macro}{north west}
+%    The standard anchors are defined. 
+%    These are based on the |\northeast| and |\northeastBB| saved anchors:
+%    \begin{macrocode}
+   \anchor{north}{ \northeast \pgf@x=0pt }
+   \anchor{north east}{ \northeast }
+   \anchor{east}{ \northeastBB \pgf@y=0pt }
+   \anchor{south east}{ \northeast \pgf@y=-\pgf@y }
+   \anchor{south}{ \northeast \pgf@x=0pt \pgf@y=-\pgf@y }
+   \anchor{south west}{ \northeast \pgf@x=-\pgf@x \pgf@y=-\pgf@y }
+   \anchor{west}{ \northeastBB \pgf@x=-\pgf@x \pgf@y=0pt }
+   \anchor{north west}{ \northeast \pgf@x=-\pgf@x }
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\anchor}
+% \begin{macro}{north east r}
+% \begin{macro}{south east r}
+% \begin{macro}{south west r}
+% \begin{macro}{north west r}
+%    Four additional anchors are defined that follow the shape's bounding rectangle. 
+%    \begin{macrocode}
+   \anchor{north east r}{\northeastBB}
+   \anchor{south east r}{\northeastBB \pgf@y=-\pgf@y}
+   \anchor{south west r}{\northeastBB \pgf@x=-\pgf@x \pgf@y=-\pgf@y}
+   \anchor{north west r}{\northeastBB \pgf@x=-\pgf@x}
+%    \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+% \end{macro} ^^A end terminal
+% \end{macro} ^^A end \pgfdeclareshape
+%
+%^^A ************************************************************
+%^^A * Terminal shape ends
+%^^A ************************************************************
+%
+% \Finale
+\endinput
diff --git a/Master/texmf-dist/source/latex/flowchart/flowchart.ins b/Master/texmf-dist/source/latex/flowchart/flowchart.ins
new file mode 100644
index 00000000000..c75538a2688
--- /dev/null
+++ b/Master/texmf-dist/source/latex/flowchart/flowchart.ins
@@ -0,0 +1,88 @@
+%
+% Flowchart 3.2
+% 28 January 2013
+%
+% flowchart.ins
+%
+%    Installation file for the flowchart package.
+%
+%    Run LaTeX on this file, with flowchart.dtx in the same
+%    folder to make the package's flowchart.sty file.
+%
+%    Run LaTeX on flowchart.dtx to produce the package 
+%    documentation.
+%
+% The flowchart package is an outcome of the Fluxion 
+% project.
+%
+% Copyright (C) 2013 by Adrian P Robson
+%     adrian.robson@nepsweb.co.uk
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either 
+% version 1.3c of this license or (at your option) any later
+% version. The latest version of this license is in
+%    http://www.latex-project.org/lppl.txt
+%
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Adrian Robson.
+%
+% This work consists of the files flowchart.dtx and 
+%                                 flowchart.ins
+% and the derived files           flowchart.sty and 
+%                                 flowchart.pdf
+% -----------------------------------------------------------
+
+\input docstrip.tex
+\keepsilent
+\askforoverwritefalse
+
+\preamble
+
+Copyright (C) 2013 by Adrian P Robson
+   adrian.robson@nepsweb.co.uk
+
+This work may be distributed and/or modified under the
+conditions of the LaTeX Project Public License, either 
+version 1.3c of this license or (at your option) any later
+version. The latest version of this license is in
+   http://www.latex-project.org/lppl.txt
+
+This work has the LPPL maintenance status `maintained'.
+The Current Maintainer of this work is Adrian Robson.
+
+This work consists of the files flowchart.dtx and 
+                                flowchart.ins
+and the derived files           flowchart.sty and 
+                                flowchart.pdf
+
+\endpreamble
+
+\Msg{}
+\Msg{**********************************************************}
+\Msg{* The flowchart package}
+\Msg{* flowchart.ins and flowchart.dtx are being processed}
+\Msg{**********************************************************}
+
+\generate{\file{flowchart.sty}{\from{flowchart.dtx}{package}}}
+
+\Msg{**********************************************************}
+\Msg{* Processing complete ...}
+\Msg{*}
+\Msg{* To finish the installation, put flowchart.sty in a} 
+\Msg{* suitable place on your system's TeX search path.}
+\Msg{*}
+\Msg{* Run LaTeX on flowchart.dtx to produce the documentation.}
+\Msg{* Comment out its 'OnlyDescription' line to include the}
+\Msg{* implementation documentation. }
+\Msg{*}
+\Msg{* You might like to keep flowchart.ins and flowchart.dtx} 
+\Msg{* somewhere safe as a backup, or in case you want to }  
+\Msg{* pass the flowchart package on to someone.}
+\Msg{*}
+\Msg{* Do not forget to delete the auxiliary files.}
+\Msg{**********************************************************}
+\Msg{}
+
+\endbatchfile
\ No newline at end of file