% =============================================================================
% Flags of the world with TikZ                       Wilhelm Haager, 2021-05-12
% Version 2023-11-12
% =============================================================================
\documentclass[11pt,a4paper,headsepline,fleqn]{scrreprt}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[american]{babel}
\usepackage[width=150mm,height=230mm]{geometry}
\usepackage{helvet}
\usepackage[bitstream-charter]{mathdesign}
\usepackage{charter}
\usepackage[nottoc,numbib]{tocbibind}  % bibliography as numbered chapter
\usepackage{array}
\usepackage{ragged2e}
\usepackage{tabularx}
\usepackage{graphicx}
\usepackage{verbatimbox}
\usepackage{xcolor}
\usepackage{pifont}
\usepackage{scrlayer-scrpage}
   \pagestyle{scrheadings}
   \clearpairofpagestyles
   \KOMAoptions{headsepline}
   \setkomafont{pagehead}{\small\rmfamily\slshape}
   \setkomafont{pagenumber}{\small\rmfamily\slshape}
   \lehead{\pagemark}
   \rehead{Worldflags}
   \lohead{Worldflags}
   \rohead{\pagemark}
   \def\chapterheadstartvskip{\vspace*{0mm}}
   \def\chapterpagestyle{scrheadings}
\raggedbottom

\usepackage{worldflags}

\definecolor{emphcolor}{rgb}{0.6,0.1,0}
\definecolor{tablefcolor}{rgb}{0.8,0.7,0.5}
\colorlet{tablecolor}{tablefcolor!40}
\definecolor{codecolor}{rgb}{0.23,0.37,0.17}
\colorlet{cbcolor}{codecolor!20} % codebox background
\colorlet{cfcolor}{codecolor!40} % codebox frame
\colorlet{ctcolor}{codecolor!60} % codebox text
\definecolor{rcolor}{rgb}{1,0.66,0.14}
\colorlet{rbcolor}{rcolor!20} % resultbox background
\colorlet{rfcolor}{rcolor!50} % resultbox frame
\colorlet{rtcolor}{rcolor!80} % resultbox text

\newcolumntype{Y}{>{\RaggedRight\arraybackslash}X}
\def\arraystretch{1.25}
\def\topfraction{1}
\def\bottomfraction{1}
\def\textfraction{0}

\def\tb{\textbackslash}
\let\ti=\textit
\let\tt=\texttt
\def\m{\mbox{}}
\def\xx#1{\mbox{}\foreach \n in {1,...,#1}{~}}
\def\colwidth{45mm} % with of the left hand column in tables
\def\command#1{{\color{emphcolor}\texttt{#1}}}

\parskip\medskipamount
\parindent0pt


% Befehle zur tabellarischen Flaggendarstellung:
% ----------------------------------------------
\newcount\zaehler\zaehler0
\newcount\flaggenproz\flaggenproz4
\newdimen\spaltenbreite\spaltenbreite\textwidth
\divide\spaltenbreite by\flaggenproz

\def\show#1#2{%
\spaltenbreite\textwidth\divide\spaltenbreite by\flaggenproz
 \advance\zaehler by 1%
 \parbox{\spaltenbreite}{%
    \centering
    \makebox[0pt]{\worldflag{#2}}{\small \ifx.#1.\else\\#1\fi\ifx.#2.\else
       \\(#2)\fi}}%
 \ifnum\zaehler=\flaggenproz\zaehler0\par\fi
}
\def\flaggenprozeile#1{\flaggenproz#1\zaehler0}

% ------------------------------------------------------------------------
% Frames
% ------------------------------------------------------------------------

\long\def\wideframe#1{{\fboxsep5mm\fboxrule0.5pt%
  \newdimen\pbwidth\pbwidth\textwidth
  \advance\pbwidth by -2\fboxsep
  \advance\pbwidth by -2\fboxrule
  \fcolorbox{tablefcolor}{tablecolor}%
  {\begin{minipage}{\pbwidth}#1\end{minipage}}}}

\long\def\codebox#1#2#3{\begin{minipage}[t]{#1\textwidth}
  \fboxsep1mm\fboxrule0.5pt%
  \newdimen\pbwidth\pbwidth\textwidth
  \advance\pbwidth by -2\fboxsep
  \advance\pbwidth by -2\fboxrule
  \fcolorbox{cfcolor}{cbcolor}%
  {\begin{minipage}[t][#2][t]{\pbwidth}%
  {\footnotesize\sffamily\bfseries\color{ctcolor}Code:\\[\smallskipamount]}%
  \footnotesize\ttfamily\color{codecolor}#3\end{minipage}}
  \end{minipage}}

\long\def\resultbox#1#2#3{\begin{minipage}[t]{#1\textwidth}
  \fboxsep1mm\fboxrule0.5pt%
  \newdimen\pbwidth\pbwidth\textwidth
  \advance\pbwidth by -2\fboxsep
  \advance\pbwidth by -2\fboxrule
  \fcolorbox{rfcolor}{rbcolor}%
  {\begin{minipage}[t][#2][t]{\pbwidth}%
  {\footnotesize\sffamily\bfseries\color{rtcolor}Result:\\[\smallskipamount]}%
  \small#3\end{minipage}}
  \end{minipage}}

% Weird hack from stackexchange to enable § as shortverb-character with utf8:
\begingroup\uccode`~="C2 \uppercase{\endgroup
\DeclareUnicodeCharacter{00A7}{\verb~}}
\begingroup\uccode`~="A7 \uppercase{\endgroup\def~}{}

\begin{document}
% --------------------------------------------------------------------------
% titlepage
% --------------------------------------------------------------------------
\title{Worldflags}
\subtitle{Drawing flags with TikZ}
\author{\slshape Wilhelm Haager\\\slshape wilhelm.haager@htlstp.ac.at}
\vfill
\vfill
\date{2023-11-12}
\vfill
\maketitle

% --------------------------------------------------------------------------
% table of contents
% --------------------------------------------------------------------------
 \tableofcontents

% --------------------------------------------------------------------------
\chapter{Introduction}
% --------------------------------------------------------------------------

\emph{Worldflags} is a package for drawing flags using TikZ.
Currently the national flags of all independent nations are included,
additionally some other flags of various organizations;
there's more to come.

A particular flag is selected via a parameter; for national flags that is the
two-letter country code (i.\,e. the domain name).
A flag can be drawn in two ways:
\begin{itemize}
\item as a single TikZ-picture within ordinary text
\item as a picture element \emph{within} a TikZ-picture
\end{itemize}

The appearance of a flag (size, frame etc.) can be adapted using
optional parameters.

The description of every flag resides in a particular flag description file
{\color{emphcolor}\texttt{worldflag\_}\textit{xx}\texttt{.tex}},
wherein \textit{xx} is the parameter for selecting a particular flag,
as listed in section \ref{FLAGS}.
That saves memory and computing time on the one hand,
as only the required flags have to be loaded.
On the other hand, the package can easily be extended by adding new
flag description files.

Some flags with complicated emblems (e.\,g. Afghanistan, Ecuador)
require a lot of memory. Thus an expansion of \TeX's main memory size
is recommended.

The flag descriptions are based on the construction sheets in
\cite{VEXILLAMUNDI}
(thanks to Mello Luchten\-berg for that great website),
complex emblems have been taken from the svg-files on Wikipedia
and have been translated into Tikz via Inkscape
(with a reasonable amount of manual post editing).

% --------------------------------------------------------------------------
\chapter{Usage}
% --------------------------------------------------------------------------

\section{Flags as single TikZ-pictures}
% ------------------------------------------------
%{\color{emphcolor}§worldflag[§\textit{opts}§]{§\textit{xx}§}§} draws the flag
%\textit{xx} with the Options \textit{opts}.  \the\textwidth

% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
\wideframe{
\raggedright
\textsl{Commands:}\\[\medskipamount]
\begin{tabularx}{\textwidth}{@{}>{\RaggedRight}p{\colwidth}Y@{}}
{\m\color{emphcolor}\texttt{\tb worldflag[}\textit{opts}\texttt{]\{}\textit{xx}\texttt{\}}}
&
draws the flag \textit{xx} with the optional parameters \textit{opts} as a particular TikZ-picture.\\
{\m\color{emphcolor}\texttt{\tb flagsdefault[}\textit{opts}\texttt{]}}
&
sets default values for the options \textit{opts} for subsequent flags.
\end{tabularx}

\bigskip
\textsl{Options:}\\[\medskipamount]
\begin{tabularx}{\textwidth}{@{}p{\colwidth}Y@{}}
{\m\color{emphcolor}\texttt{width=}\textit{dimension}}
&
sets the flag width, default: $15\,\mathrm{mm}$.\\
{\m\color{emphcolor}\texttt{length=}\textit{dimension}}
&
sets the flag length; if set to 0\,pt (default), the length is calculated according to the proper aspect ratio of the flag.\\
{\m\color{emphcolor}\texttt{framewidth=}\textit{dimension}}
&
sets the line width of the frame around the flag, default: 0.2\,mm.\\
{\m\color{emphcolor}\texttt{framecolor=}\textit{colorname}}
&
sets the color of the flag frame, default: \texttt{black!60}.\\
{\m\color{emphcolor}\texttt{stretch=}\textit{number}}
&
controls stretching and shrinking of geometric shapes when the aspect ratio differs from its proper value.\\
{\m\color{emphcolor}\texttt{grid}}
&
causes a millimeter-grid drawn on the flag as an aid for constructing new flags.\\
{\m\color{emphcolor}\texttt{noemblem}}
&
supresses the drawing of an emblem, which is part of many flags.\\
{\m\color{emphcolor}\texttt{emblem}}
&
enforces the drawing of an emblem onto the flag which is otherwise supressed (currently only applies to the flags of Austria and Germany).\\
{\m\color{emphcolor}\texttt{emblemdefault}}
&
restores the default behavior for drawing emblems.\\
{\m\color{emphcolor}\texttt{variant=}\textit{x}}
&
selects a variant \textit{x} of a flag (default: 0).\\
\end{tabularx}}
% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

\bigskip
\command{\tb worldflag\{{\rmfamily\itshape xx}\}} draws a flag,
selected by the parameter \textit{xx}, as a single TikZ-picture.
Section \ref{FLAGS} lists all available flags and their selection code \textit{xx}.
Various properties of the flag can be specified with additional optional parameters
as key-value pairs.

\command{\tb flagsdefault[{\rmfamily\itshape opts}]} specifies default values
for the Options {\rmfamily\itshape opts} for subsequent flags.

The \emph{width} of a flag defaults to 15\,mm, it can be overridden with the option
\command{width}.
If one of the dimensions \emph{width} or \emph{length} is set to 0\,pt
(which is the default value for \emph{length}), its value
results from the proper aspect ratio width/length, which is proprietary to every flag.
E.\,g. the Swiss flag is quadratic, it has an aspect ratio of 1:1,
the British flag has an aspect ratio of 1:2.
If \command{width} is set to 0\,pt, \command{length} \emph{must} be specified.
If both dimensions are specified, flags loose their proper aspect ratio
but get the same size:

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.45}{38mm}{\tb worldflag\{CH\}\\\tb worldflag\{GB\}\\
   proper sizes\tb\tb[6pt]\\
   \tb worldflag[length=22.5mm]\{CH\}\\\tb worldflag[length=22.5mm]\{GB\}\\
   distorted}\hfill
\resultbox{0.54}{38mm}{\worldflag{CH} \worldflag{GB} proper sizes\\[6pt]
   \worldflag[length=22.5mm]{CH} \worldflag[length=22.5mm]{GB} distorted}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
If both width and length of a flag are specified, which differs from ist
proper aspect ratio, some geometries on the flag will unavoidably
get distorted.
There is presumably no general rule whether certain \emph{distances} on the flag
should remain unchanged in that case, or certain \emph{ratios}
-- as flag owners do not intend to distort their flags --
but that behavior can be influenced for many flags applying the option
\command{stretch}.
If stretch is set to 0 (which is default), certain \emph{distances} and
\emph{sizes} on the flag remain unchanged, when the flag is stretched;
if set to 1, certain \emph{ratios} remain unchanged in that case.
Values within the range of 0\dots 1 are possible to get a compromise
between both cases.

The following examples illustrate that behavior:

\begin{tabularx}{\textwidth}{@{}llX@{}}
Canada: & \command{stretch=0} & The \emph{size} of the maple leaf remains unchanged.\\
        & \command{stretch=1} & The \emph{ratio} of the widths -- maple leaf and pale -- remains unchanged; the maple leaf has to shrink.
\end{tabularx}

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.45}{20mm}{
   \tb flagsdefault[width=12mm]
   \tb worldflag\{CA\}\\
   \tb worldflag[length=18mm]\{CA\}\\
   \tb worldflag[length=18mm,stretch=1]\{CA\} }\hfill
\resultbox{0.54}{20mm}{%
   \flagsdefault[width=12mm]
   \worldflag{CA}
   \worldflag[length=18mm]{CA}
   \worldflag[length=18mm,stretch=1]{CA}
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\begin{tabularx}{\textwidth}{@{}llX@{}}
Denmark: & \command{stretch=0} & The \emph{distance} from the vertical bar to the hoist remains unchanged.\\
         & \command{stretch=1} & The \emph{ratio} of the distances to the hoist and to the fly remains unchanged.
\end{tabularx}

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.45}{20mm}{
   \tb flagsdefault[width=12mm]
   \tb worldflag\{DK\}\\
   \tb worldflag[length=18mm]\{DK\}\\
   \tb worldflag[length=18mm,stretch=1]\{DK\} }\hfill
\resultbox{0.54}{20mm}{%
   \flagsdefault[width=12mm]
   \worldflag{DK}
   \worldflag[length=25mm]{DK}
   \worldflag[length=25mm,stretch=1]{DK}
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
The option \command{grid} causes a millimeter-grid drawn over the flag.
That is primarily a measuring aid for the construction of new flags.

The options \command{framecolor} and \command{framewidth} set the color
and the line width of the frame drawn around the flag, respectively.
The default value for the line width is 0.2\,mm, the default color is
\texttt{black!60}.
If \command{framewidth} is set to 0\,mm (or 0\,pt), no frame is drawn at all.

\flagsdefault[length=0mm,width=15mm]
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.45}{20mm}{
   \tb flagsdefault[framecolor=blue]
   \tb worldflag[grid]\{IT\}\\
   \tb worldflag[framewidth=1mm]\{IT\}\\
   \tb worldflag[framewidth=0mm]\{IT\} }\hfill
\resultbox{0.54}{20mm}{%
   \flagsdefault[framecolor=blue]
   \worldflag[grid]{IT}
   \worldflag[framewidth=1mm]{IT}
   \worldflag[framewidth=0mm]{IT}
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
Many flags have an emblem on it,
e.\,g. a coat of arms or a special symbol.
Those emblems are often very complex and require a lot of computing time and
memory.
The depiction of such an emblem can be supressed with the option
\command{noemblem}, either for the sake of saving computing time
(for drafts) or just because simplified version of the flag is required.
Some countries distinguish between a \emph{civil} flag without an emblem
and a \emph{state} flag containing an emblem.

Some flags don't have an emblem by default, but an emblem is available
for special purposes.
In that case the depiction of the emblem can be enforced with the option
\command{emblem}.
Currently that only applies to the country flags of Austria, Germany
and Spain (more will come).
The option \command{emblemdefault} restores the default behavior for drawing
emblems.


\flagsdefault[length=25mm,width=15mm]
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.45}{37mm}{%
   \tb worldflag\{AT\}\\
   \tb worldflag[emblem]\{AT\}\\
   \tb worldflag[noemblem]\{AT\}\tb\tb[6pt]\\
   \tb worldflag\{HR\}\\
   \tb worldflag[emblem]\{HR\}\\
   \tb worldflag[noemblem]\{HR\}%
   }\hfill
\resultbox{0.54}{37mm}{%
   \worldflag{AT}
   \worldflag[emblem]{AT}
   \worldflag[noemblem]{AT}\\[6pt]
   \worldflag{HR}
   \worldflag[emblem]{HR}
   \worldflag[noemblem]{HR}%
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
The emblem (i.\,e. the coat of arms) in the Austrian flag is supressed by default,
the emblem in the Croatian flag is depicted default.

Some flags have several variants on disposal which can vary in geometry, colors etc.
A certain variant is selected by the option \command{variant} (default: 0).
For example, the flag of the Italian region Veneto has a variant with a
quadratic flag area and appended stripes, as well as a variant with a rectangular
flag area where the stripes are included:

\flagsdefault[length=37mm,width=25mm]
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.45}{29mm}{%
   \tb worldflag\{IT-VE\}\\
   \tb worldflag[variant=1]\{IT-VE\}\\
   }\hfill
\resultbox{0.54}{29mm}{%
   \worldflag{IT-VE}
   \worldflag[variant=1]{IT-VE}%
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Some flags with complex elements (e.\,g. the Austrian flag with emblem) have
an additional variant with an included pdf-Image instead of \emph{TikZ}-code.
Putting up with some loss in flexibility, that saves memory and computing time.

\section{Flags as picture elements within a TikZ-picture}\label{SECTION_PIC}
% ------------------------------------------------

Within a Tikz-picture the flags are available as \emph{pic}-Elements
named \command{worldflag}.
A particular flag is selected with the option \command{country}.
Unlike \emph{nodes}, \emph{pic}-elements cannot be referenced by name,
but named nodes and coordinates within the \emph{pic}-element can be referenced.
Hence every flag has special coordinates for referencing:

\qquad{\divide\tabcolsep by 3
\begin{tabular}{@{}lclllcl}
\command{-0}  & \dots & center of flag &~~~& & & \\
\command{-nw} & \dots & upper left corner  (``north-west'')&~~~& \command{-n} & \dots & top edge center (``north'') \\
\command{-ne} & \dots & upper right corner (``north-east'')&~~~& \command{-e} & \dots & fly edge center (``east'') \\
\command{-sw} & \dots & lower left corner  (``south-west'') &~~~& \command{-w}& \dots & hoist edge center (``west'')  \\
\command{-se} & \dots & lower right corner (``south-east'') &~~~& \command{-s}& \dots & bottom edge center (``south'')
\end{tabular}
}

\medskip
Some additional options for rotating and shearing a flag are available.

% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
\wideframe{
\textsl{Command:}\\
\begin{tabularx}{\textwidth}{@{}>{\RaggedRight}p{\colwidth}X@{}}
{\m\color{emphcolor}\makebox[0pt][l]{\texttt{\tb pic (}\textit{xy}\texttt{) [country=}\textit{xx\,, \dots}\texttt{]~at }\textit{pos}\texttt{ \{worldflag\};}}}
& \\
& draws the flag \textit{xx} and gives it the name \textit{xy}; the flag is centerd at the coordinate \textit{pos}.\\
%{\m\color{emphcolor}\texttt{\tb flagsdefault[}\textit{opts}\texttt{]}}
%&
%sets default values for the options \textit{opts}.
\end{tabularx}

\medskip
%\textsl{Options:}\\
\textsl{Additional Options:}\\
\begin{tabularx}{\textwidth}{@{}p{\colwidth}Y@{}}
% {\m\color{emphcolor}\texttt{width=}\textit{dimension}}
% &
% sets the flag width, default: $15\,\mathrm{mm}$.\\
% {\m\color{emphcolor}\texttt{length=}\textit{dimension}}
% &
% sets the flag length; if set to 0\,pt (default), the length is calculated according to the proper aspect ratio of the flag.\\
% {\m\color{emphcolor}\texttt{framewidth=}\textit{dimension}}
% &
% sets the line width of the frame around the flag, default: 0.2\,mm.\\
% {\m\color{emphcolor}\texttt{framecolor=}\textit{colorname}}
% &
% sets the color of the flag frame, default: \texttt{black!60}.\\
% {\m\color{emphcolor}\texttt{stretch=}\textit{number}}
% &
% controls stretching and shrinking of geometric shapes when the aspect ratio differs from its proper value.\\
% {\m\color{emphcolor}\texttt{grid}}
% &
% causes a millimeter-grid drawn on the flag.\\
% {\m\color{emphcolor}\texttt{noemblem}}
% &
% supresses the drawing of an emblem onto the flag.\\
% {\m\color{emphcolor}\texttt{emblem}}
% &
% enforces the drawing of an emblem onto the flag.\\
% {\m\color{emphcolor}\texttt{emblemdefault}}
% &
% restores the default behavior for drawing emblems.\\
{\m\color{emphcolor}\texttt{rotate=}$\alpha$}
&
rotates the flag $\alpha$ degrees around its center.\\
{\m\color{emphcolor}\texttt{turn=}$\beta$}
&
rotates the flag $\beta$ degrees around the (imaginary) flagpole.\\
{\m\color{emphcolor}\texttt{hang=}$\gamma$}
&
lets the flag ``hang down'' $\gamma$ degrees from the (imaginary) flag pole.
\end{tabularx}}
% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

\medskip
The following example illustrates the usage of the special coordinates:

\flagsdefault[length=25mm,width=15mm]
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.63}{58mm}{%
   \tb begin\{tikzpicture\}[draw=cyan,>=stealth,x=1mm,y=1mm]\\
   \tb pic (de) [country=DE,emblem] \{worldflag\};\\
   \tb draw (de-e){-}-++(45:5)\\
   \xx6 node [above right,cyan] \{fly\};\\
   \tb draw (de-w)--++(45:14)\\\mbox{}~~~~~~node [above right,cyan] \{hoist\};\\
   \tb draw (de-0)--++(45:14)\\\mbox{}~~~~~~node [above right,cyan] \{coat of arms\};\\
   \tb draw (de-nw)--++(-5,0) (de-sw)--++(-5,0);\\
   \tb draw [<->] (\$(de-nw)-(4,0)\$){-}-(\$(de-sw)-(4,0)\$)\\\mbox{}~~~~~~node [midway,above,rotate=90,cyan] \{width\};\\
   \tb draw [<->] (\$(de-sw)-(0,6)\$){-}-(\$(de-se)-(0,6)\$)\\\mbox{}~~~~~~node [midway,above,cyan] \{length\};\\
   \tb end\{tikzpicture\}%
   }\hfill
\resultbox{0.36}{58mm}{%
   \begin{tikzpicture}[draw=cyan,>=stealth,x=1mm,y=1mm]
   \pic (de) [country=DE,emblem] {worldflag};
   \draw (de-e)--++(45:5) node [above right,cyan] {fly};
   \draw (de-w)--++(45:14) node [above right,cyan] {hoist};
   \draw (de-0)--++(45:14) node [above right,cyan] {coat of arms};
   \draw (de-nw)--++(-5,0) (de-sw)--++(-5,0);
   \draw [<->] ($(de-nw)-(4,0)$)--($(de-sw)-(4,0)$) node [midway,above,rotate=90,cyan] {width};
   \draw (de-sw)--++(0,-7) (de-se)--++(0,-7);
   \draw [<->] ($(de-sw)-(0,6)$)--($(de-se)-(0,6)$) node [midway,above,cyan] {length};
   \end{tikzpicture}
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\newpage
The option \command{rotate} causes the flag to be rotated around the
flag center with a given angle in degree.

Note: That option is not proprietary to flags, it is a general option for
\emph{any} {pic}-element.
Hence it is \emph{not} possible to give it a default value
% -- unlike all other options --
with the command \texttt{flagsdefault}.

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.53}{70mm}{%
   \tb begin\{tikzpicture\}\\
   \tb flagsdefault[width=12mm,length=18mm]\\
   \tb foreach \tb c/\tb n in \{HU/0,SK/1,IT/6,SI/7\}\\
   \xx3\tb pic [country=\tb c,rotate=\tb n*45]\\
   \xx7 at (\tb n*45:24mm) \{worldflag\};\\
   \tb foreach \tb c/\tb n in \{CZ/2,DE/3,LI/4,CH/5\}\\
   \xx3\tb pic [country=\tb c,rotate=\tb n*45-180]\\
   \xx7 at (\tb n*45:24mm) \{worldflag\};\\
   \tb end\{tikzpicture\}
   }\hfill
\resultbox{0.46}{70mm}{%
   \begin{tikzpicture}
   \flagsdefault[width=12mm,length=18mm]
   \foreach \c/\n in {HU/0,SK/1,IT/6,SI/7}
   \pic [country=\c,rotate=\n*45] at (\n*45:24mm) {worldflag};
   \foreach \c/\n in {CZ/2,DE/3,LI/4,CH/5}
   \pic [country=\c,rotate=\n*45-180] at (\n*45:24mm) {worldflag};
   \end{tikzpicture}
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
The option \command{turn} lets the flag rotate around the imaginary flagpole
with a given angle $\beta$ (in degrees).
The length of the flag will \emph{seemingly} shrink with a factor of $\cos\beta$.
With a value of $\beta\!=\!180$ the flag will just appear mirrored.
The option \command{hang} lets the flag ``hang down'' from the imaginary flagpole
with a given angle $\gamma$ (in degrees);
the flag will be sheared and compressed accordingly.

The following example shows a combination of
\command{rotate}, \command{turn} and \command{hang}.

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.53}{75mm}{%
   \tb begin\{tikzpicture\}[x=1mm,y=1mm]\\
   \tb def\tb w\{30\}\\
   \tb def\tb d\{20\}\\
   \tb pgfdeclarehorizontalshading\{flagpole\}\\
   \xx3\{30mm\}\{color(0mm)=(white);\\
   \xx3color(1mm)=(brown); color(2mm)=(black)\}\\
   \tb flagsdefault[width=15mm,hang=20]\\
   \tb pic (gb) [country=GB,rotate=-\tb w]\\
   \xx5at (\tb d,0) \{worldflag\};\\
   \tb pic (us) [country=US,rotate=\tb w,turn=180]\\
   \xx5at (-\tb d,0) \{worldflag\};\\
   \tb fill [shading=flagpole,shading angle=-\tb w,\\
   \xx6rotate around=\{-\tb w:(gb-nw)\}]\\
   \xx6(gb-nw)-|++(-2,-60)-|cycle;\\
   \tb fill [shading=flagpole,shading angle=\tb w,\\
   \xx6rotate around=\{\tb w:(us-nw)\}]\\
   \xx6(us-nw)-|++(2,-60)-|cycle;\\
   \tb end\{tikzpicture\}
   }\hfill
\resultbox{0.46}{75mm}{%
   \begin{tikzpicture}[x=1mm,y=1mm]
   \def\w{30}
   \def\d{20}
   \pgfdeclarehorizontalshading{flagpole}{30mm}
   {color(0mm)=(white); color(1mm)=(brown); color(2mm)=(black)}
   \flagsdefault[width=15mm,hang=20]
   \pic (gb)[country=GB,rotate=-\w] at (\d,0) {worldflag};
   \pic (us)[country=US,rotate=\w,turn=180] at (-\d,0) {worldflag};
   \fill [shading=flagpole,shading angle=-\w,rotate around={-\w:(gb-nw)}] (gb-nw)-|++(-2,-60)-|cycle;
   \fill [shading=flagpole,shading angle=\w,rotate around={\w:(us-nw)}] (us-nw)-|++(2,-60)-|cycle;
   \end{tikzpicture}
   }
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

% --------------------------------------------------------------------------
\chapter{Internals}
% --------------------------------------------------------------------------

This section is intended for those who want to \emph{extend} the worldflags
package and {create} new flags.
Those who just want to \emph{use} the package and {draw} existing flags,
need not read it.

Evey flag resides in a particular ``flag description file''
named \command{worldflag\_}\textit{\color{emphcolor}xx}\command{.tex}, wherein
\textit{\color{emphcolor}xx} is the code for selecting a flag.
Extending the package with new flags is quite easy:
Just a flag description file for every new flag has to be written and put into
a directory, where \TeX\ can find it.
No configuraion files, no other actions; that's it.

\section{Flag description file}\label{SEC_FLAG_DESCRIPTION}
% -----------------------------

Every flag description file has the following structure:

{\color{emphcolor}\small
\tt{\tb begin\{flagdescription\}\{$\xi$\}}~~~{\normalsize\color{black}\ding{192}}\\
\tt{\tb definecolor\{red\}\{RGB\}\{}\ti{r}\tt{,}\ti{g}\tt{,}\ti{b}\tt{\}}~~~{\normalsize\color{black}\ding{193}}\\
\tt{\tb definecolor\{gold\}\{RGB\}\{}\ti{r}\tt{,}\ti{g}\tt{,}\ti{b}\tt{\}}\\
\xx9\makebox[0pt]{$\vdots$}\\
\xx9{\makebox[0pt]{\normalsize\color{black}\ding{194}}}\\
\xx9\makebox[0pt]{$\vdots$}\\
\tt{\tb framecode\{}\ti{code}\tt{\}}~~~{\normalsize\color{black}\ding{195}}\\
\tt{\tb end\{flagdescription\}}~~~{\normalsize\color{black}\ding{196}}\\
}

\begin{itemize}
\item[\ding{192}]
All commands describing the geometry of a flag have to be within
the environment \command{flagdescription}.
This environmant requires a parameter
\emph{\color{emphcolor}$\xi$}, which specifies the proper aspect ratio
\emph{width/length} of a flag.
Using that parameter, the flag length is calculatend from the flag width
(or vice versa).
As \command{$\xi$} is further processed using \tt{\tb pgfmathparse},
is can be specified as a floating point number or as a ratio of two
(preferably integer) numbers.

Furthermore, two nested scopes are opened:
The outer scope sets the drawing unit to \command{\tb flagwidth}
(note: the top edge of a flag has always a \ti{y}-coordinate of 1)
and performs the coordinate transformation according to the options
\command{turn} and \command{hang}.
The inner scope shifts the coordinate system to the flag center.
That shift is only for rotation and positioning of the flag within a
TikZ-picture.
For the flag description the origin of the coordinate system remains on the
lower left corner of the flag.

In the sequel, the special coordinates
\command{-0}, \command{-n}, \command{-ne}, \command{-e}, \command{-se},
\command{-s}, \command{-sw}, \command{-w} and \command{-nw}
are established -- as described in section \ref{SECTION_PIC}.

\item[\ding{193}]
Every flag has proprietary shadings of colors.
Hence even common colors have to be redefined for every flag separately.

\item[\ding{194}]
TikZ commands for drawing and filling of shapes make up the core of
a flag description file.
A couple of macros (see section \ref{SEC_MACROS})
for common geometric figures facilitate the creation of the flag image.

\item[\ding{195}]
\emph{\color{emphcolor}code} is the drawing path for te frame around the flag.
In (the most common) case of a rectangular shape of the flag
(an exception is e.\,g. the flag of Nepal) \ti{code} can be left empty;
a rectangular frame is drawn automatically in that case.

The line width, set with the option \command{framewidth}, is stored in the
dimension register \command{\tb flagframe};
the frame color, set with the option \command{framecolor}, is stored in the
macro \command{\tb framecolor}.

\item[\ding{196}]
At the end of the environment a millimeter-grid is drawn onto the flag, if invoked with the option
\command{grid} and the two previously opened scopes are closed again.
\end{itemize}

\section{Variables}
% -----------------

The properties of a flag are kept in variables,
which are dimension registers or macros.
Those variables are either set by the user via specifying options or are calculated
internally.
Most of those variables are used internally, only the following few variables
are used in the code for the flag description:

 % +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
\wideframe{
\textsl{Dimension registers:}\\
\begin{tabularx}{\textwidth}{@{}>{\RaggedRight}p{\colwidth}Y@{}}
{\m\color{emphcolor}\texttt{\tb flagwidth}}
&
width of the flag (vertical extent)\\
{\m\color{emphcolor}\texttt{\tb flaglength}}
&
length of the flag (horizontal extent)\\
\end{tabularx}

\bigskip
\begin{tabularx}{\textwidth}{@{}>{\RaggedRight}p{\colwidth}X@{}}
\textsl{Macros:}\\
{\m\color{emphcolor}\texttt{\tb stretchfactor}}
&
factor for stretching of certain geometries\\
{\m\color{emphcolor}\texttt{\tb flagvariant}}
&
contains a single digit (or letter) for branching the code to a particular
variant\\
\end{tabularx}}
% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

\medskip
\command{\tb flagwidth} and \command{\tb flaglength} specify the width and
length of a flag.
They are set by the user with the options \command{width} and \command{length}
or are calculaterd from each other at the begin of the environment
\command{flagdescription} internally.
\command{\tb flagwidth} is the unit for coordinates and lengths
in the flag description.

\command{\tb stretchfactor} is a factor for stretching certain \ti{x}-coordinates,
when the whole flag is stretched (or compressed),
i.\,e. when the aspect ratio differs from its proper value.
It is calculated from the user option \command{stretch}
(stored in the macro \command{\tb flagstretch})
as follows and can be used in the flag description:

\[
f_s = 1 + \frac{l-l_0}{l_0}\cdot s, \quad
\parbox[t]{0.7\textwidth}{%
with\quad
\begin{tabular}[t]{@{}l@{~\dots~}l}
$f_s$ & the variable \tt{\tb stretchfactor} \\
$l_0$ & proper aspect ratio of the flag \\
$l$   & actual aspect ratio of the flag \\
$s$   & value of the user specified option \tt{stretch} \\
\end{tabular}}
\]

In the following example the yellow diamonds keep their
\emph{distances} to the
borders of the flag (hoist and fly, respectively), when the flag is stretched
or compressed,
the white diamonds keep their \emph{relative positions} on the flag
in that case.

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.70}{70mm}{%
   \tb def\tb diamond\#1\#2\{\tb begin\{scope\}[shift=\{\#2\}]     \\
   \xx4\tb fill [\#1] (3/20,0)--(0,4/20)--(-3/20,0)--(0,-4/20);     \\
   \xx4\tb end\{scope\}\}\%                                          \\
   \tb def\tb drawflag\{\%                                           \\
   \xx4\tb begin\{tikzpicture\}                                        \\
   \xx4\tb begin\{flagdescription\}\{2/3\}                             \\
   \xx4\xx3\tb background\{cyan\}                                        \\
   \xx4\xx3\tb diamond\{yellow\}\{(0.5,0.75)\}                           \\
   \xx4\xx3\tb diamond\{yellow\}\{(\$(\tb flaglength,0.75)-(0.5,0)\$)\}    \\
   \xx4\xx3\tb diamond\{white\}\{(0.5*\tb stretchfactor,0.25)\}          \\
   \xx4\xx3\tb diamond\{white\}\\\xx7\xx3\{(\$(\tb flaglength,0.25)-(0.5*\tb stretchfactor,0)\$)\}
   \xx4\tb end\{flagdescription\}  \\
   \xx4\tb end\{tikzpicture\}\}\%    \\
   \tb drawflag\tb par\tb medskip \\
   \tb newdimen\tb flaglength\tb flaglength=40mm  \\
   \tb def\tb flagstretch\{1\}%                   \\
   \tb drawflag
   }
\resultbox{0.29}{70mm}{%
   \def\diamond#1#2{%
   \begin{scope}[shift={#2}]
      \fill [#1] (3/20,0)--(0,4/20)--(-3/20,0)--(0,-4/20);
   \end{scope}}%
   \def\drawflag{%
   \begin{tikzpicture}
   \begin{flagdescription}{2/3}
     \background{cyan}
     \diamond{yellow}{(0.5,0.75)}
     \diamond{yellow}{($(\flaglength,0.75)-(0.5,0)$)}
     \diamond{white}{(0.5*\stretchfactor,0.25)}
     \diamond{white}{($(\flaglength,0.25)-(0.5*\stretchfactor,0)$)}
   \end{flagdescription}
   \end{tikzpicture}}%
   \drawflag\par\medskip
   \newdimen\flaglength\flaglength=40mm
   \def\flagstretch{1}%
   \drawflag
}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
By checking the macro \command{\tb flagvariant},
which has to expand to a single digit or character,
\TeX-code can be executed conditionally by use of
\command{\tb if...\tb else...\tb fi}.
The following example demonstrates two variants of a flag:

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.75}{66mm}{%
   \tb def\tb drawflag\{\%                                             \\
   \xx4\tb begin\{tikzpicture\}                                        \\
   \xx4\tb begin\{flagdescription\}\{2/3\}                             \\
   \xx4\xx3\tb background\{cyan\}                                      \\
   \xx4\xx3\tb if\tb flagvariant0                                      \\
   \xx4\xx3\xx3\tb fill [white] (0.5\tb flaglength,0.5) circle \{0.3\};\\
   \xx4\xx3\tb else                                                    \\
   \xx4\xx3\xx3\tb fill [white] (0.5\tb flaglength,0.5)  ++(-0.3,-0.3) \\
   \xx4\xx3\xx3\xx5 rectangle ++(0.6,0.6);                             \\
   \xx4\xx3\tb fi                                                      \\
   \xx4\tb end\{flagdescription\}                                      \\
   \xx4\tb end\{tikzpicture\}\}\%                                      \\
   \tb def\tb flagvariant\{0\}\%                                       \\
   \tb drawflag                                                        \\
   \tb def\tb flagvariant\{1\}                                         \\
   \tb drawflag
   }
\resultbox{0.24}{66mm}{%
   \def\drawflag{%
   \begin{tikzpicture}
   \begin{flagdescription}{2/3}
     \background{cyan}
     \if\flagvariant0
       \fill [white] (0.5\flaglength,0.5) circle (0.3);
     \else
       \fill [white] (0.5\flaglength,0.5) ++(-0.3,-0.3) rectangle ++(0.6,0.6);
     \fi
   \end{flagdescription}
   \end{tikzpicture}}%
   \def\flagvariant{0}%
   \drawflag\par\medskip
   \def\flagvariant{1}
   \drawflag
}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\section{Commands}\label{SEC_MACROS}
% ----------------------------------

A couple of commands for common geometric elements on flags facilitate
the flag description.
To avoid accidental name clashes with other packages,
the visibility of those commands is confined to the environment
\command{flagdescription}.


% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
\begin{figure}[t]
\wideframe{
\begin{tabularx}{\textwidth}{@{}>{\RaggedRight}p{\colwidth}>{\RaggedRight}Y@{}}
{\m\color{emphcolor}\tt{\tb begin\{flagdescription\}\{}$\xi$\tt{\}}}
&
\\
\qquad $\vdots$ & \\
{\m\color{emphcolor}\tt{\tb end\{flagdescription\}}}
&
environment for the flag  with aspect ratio $\xi$\\
\end{tabularx}

\bigskip
\begin{tabularx}{\textwidth}{@{}>{\RaggedRight}p{\colwidth}X@{}}
\textsl{Geometric flag elements:}
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb framecode\{}\ti{path}\tt{\}}}
& drawing path for the frame around the flag; if \emph{path} is empty, a rectangular frame is drawn.
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb hstripesII\{}{$c_1$}\tt{\}\{}{$c_2$}\tt{\}}}
& partitions the flag into two horizontal stripes with the colors $c_1$ and $c_2$.
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb hstripesIII\{}{$c_1$}\tt{\}\{}{$c_2$}\tt{\}\{}{$c_3$}\tt{\}}}
& three horizontal stripes with the colors $c_1$, \dots\ $c_3$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb hstripesIV\{}{$c_1$}\tt{\}\{}{$c_2$}\tt{\}\{}{$c_3$}\tt{\}\{}{$c_4$}\tt{\}}}
& \qquad four horizontal stripes with the colors $c_1$, \dots\ $c_4$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb vstripesII\{}{$c_1$}\tt{\}\{}{$C_2$}\tt{\}}}
& partitions the flag into two vertical stripes with the colors $c_1$ and $c_2$.
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb vstripesIII\{}{$c_1$}\tt{\}\{}{$c_2$}\tt{\}\{}{$c_3$}\tt{\}}}
& three vertical stripes with the colors $c_1$, \dots\ $c_3$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb hbar\{}{$c$}\tt{\}\{}{$y$}\tt{\}\{}{$w$}\tt{\}}}
& horizontal bar with the color $c$ and the line width $w$ at the \ti{y}-coordinate $y$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb vbar\{}{$c$}\tt{\}\{}{$x$}\tt{\}\{}{$w$}\tt{\}}}
& vertical bar with the color $c$ and the line width $w$ at the \ti{x}-coordinate $x$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb chevron\{}{$c$}\tt{\}\{}{$x$}\tt{\}}}
& isosceles triangle at the hoist with the color $c$ and the vertex at the \ti{x}-coordinate $x$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb starV\{}{$c$}\tt{\}\{}{$p$}\tt{\}\{}{$r$}\tt{\}\{}{$\alpha$}\tt{\}}}
& 5-pointed star as a compex polygon with the fill color $c$, an outer raduis $r$, an angle $\alpha$ at the coordinate $p$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb starVI\{}{$c$}\tt{\}\{}{$p$}\tt{\}\{}{$r$}\tt{\}\{}{$\alpha$}\tt{\}}}
& 6-pointed star as a compex polygon with the fill color $c$, an outer raduis $r$, an angle $\alpha$ at the coordinate $p$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb starn\{}{$c$}\tt{\}\{}{$n$}\tt{\}\{}{$p$}\tt{\}\{}{$r_1$}\tt{\}\{}{$r_2$}\tt{\}\{}{$\alpha$}\tt{\}}}
& \qquad n-pointed star with color $c$, an outer raduis $r_1$, an inner raduis $r_2$ and an angle $\alpha$ at the coordinate $p$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb moon\{}{$c$}\tt{\}\{}{$p_1$}\tt{\}\{}{$r_1$}\tt{\}\{}{$p_2$}\tt{\}\{}{$r_2$}\tt{\}}}
& crescent moon with the fill color $c$, as a difference set of two generating circles with the radii $r_1$, $r_2$, and center coordinates $p_1$ and $p_2$
\\ % --------------------------
{\m\color{emphcolor}\tt{\tb unionjack\{}{$x_1$}\tt{\}\{}{$y_1$}\tt{\}\{}{$x_2$}\tt{\}\{}{$y_2$}\tt{\}}}
& \qquad Union Jack between the coordinates $(x_1,y_1)$ and $(x_2,y_2)$
\\ % --------------------------
\end{tabularx}}
% +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
\end{figure}
\newpage
The macros
\command{\tb hstripesII}, \command{\tb hstripesIII}, \command{\tb hstripesIV},
\command{\tb vstripesII}, \command{\tb vstripesIII} partition the flag into an
according number of horizontal or vertical colored stripes.

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \codebox{0.65}{27mm}{%
 \tb begin\{tikzpicture\}
  \tb begin\{flagdescription\}\{3/4\}        \\
  \xx3\tb hstripesIII\{cyan\}\{white\}\{red\}\\
  \tb end\{flagdescription\}
  \tb end\{tikzpicture\} \tb quad   \\
  \tb begin\{tikzpicture\}
  \tb begin\{flagdescription\}\{3/4\}        \\
  \xx3\tb vstripesIII\{cyan\}\{white\}\{red\}\\
   \tb end\{flagdescription\}
      \tb end\{tikzpicture\}                 \\
    }\hfill
\resultbox{0.34}{27mm}{%
  \begin{tikzpicture}
  \begin{flagdescription}{3/4}
    \hstripesIII{cyan}{white}{red}
  \end{flagdescription}
  \end{tikzpicture}
  \quad
  \begin{tikzpicture}
  \begin{flagdescription}{3/4}
    \vstripesIII{cyan}{white}{red}
   \end{flagdescription}
   \end{tikzpicture}
}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
\command{\tb background} fills the entire rectangular area of the flag with
color; note: a flag needs neither a frame around it nor a background on principle.
\command{\tb hbar} draws a horizontal bar of given width and color
at a specified \ti{y}-coordinate across the flag;
\command{\tb vbar} does the same vertically.
\command{\tb chevron} draws an isosceles triangle with a given height over
the hoist.

 %~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \codebox{0.65}{46mm}{%
   \tb begin\{tikzpicture\}
   \tb begin\{flagdescription\}\{3/4\} \\
   \xx3\tb background\{cyan\}              \\
   \xx3\tb hbar\{white\}\{0.5\}\{0.3\}     \\
   \xx3\tb vbar\{white\}\{0.5\}\{0.3\}     \\
   \tb end\{flagdescription\}
   \tb end\{tikzpicture\}              \\
   \tb quad                            \\
   \tb begin\{tikzpicture\}
   \tb begin\{flagdescription\}\{3/4\}
   \xx3\tb chevron\{cyan\}\{1\}            \\
   \xx3\tb framecode{}                       \\
   \tb end\{flagdescription\}
   \tb end\{tikzpicture\}
    }\hfill
\resultbox{0.34}{46mm}{%
   \begin{tikzpicture}
   \begin{flagdescription}{3/4}
   \background{cyan}
   \hbar{white}{0.5}{0.3}
   \vbar{white}{0.5}{0.3}
   \end{flagdescription}
   \end{tikzpicture}
   \quad
   \begin{tikzpicture}
   \begin{flagdescription}{3/4}
   \chevron{cyan}{1}
   \framecode{}
   \end{flagdescription}
   \end{tikzpicture}
}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
\command{\tb unionjack} draws the Union Jack
(which is part of a couple of flags)
between a lower left and an upper right point.
Their coordinates -- $x_1$, $y_1$, $x_2$,$y_2$ -- are separate
parameters, which \emph{must} be specified as dimensions
(i.\,e. using a unit), not just as numbers.
The colors \command{blue}, \command{red} and \command{white}
can be redefined arbitrarily.

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.65}{46mm}{%
   \tb begin\{tikzpicture\}
   \tb begin\{flagdescription\}\{3/4\}  \\
   \tb unionjack\{0mm\}\{0mm\}\{\tb flaglength\}\{\tb flagwidth\} \\
   \tb end\{flagdescription\}
   \tb end\{tikzpicture\} \\
   \tb quad                \\
   \tb begin\{tikzpicture\}
   \tb begin\{flagdescription\}\{3/4\} \\
   \tb colorlet\{blue\}\{black\}  \\
   \tb definecolor\{red\}\{rgb\}\{0.9,0.6,0\} \\
   \tb unionjack\{0mm\}\{5mm\}\{10mm\}\{\tb flagwidth\}\\
   \tb framecode{}\\
   \tb end\{flagdescription\}
   \tb end\{tikzpicture\}  \\
   }
\resultbox{0.34}{46mm}{%
   \begin{tikzpicture}
   \begin{flagdescription}{3/4}
   \unionjack{0mm}{0mm}{\flaglength}{\flagwidth}
   \end{flagdescription}
   \end{tikzpicture}
   \quad
   \begin{tikzpicture}
   \begin{flagdescription}{3/4}
   \colorlet{blue}{black}
   \definecolor{red}{rgb}{0.9,0.6,0}
   \unionjack{0mm}{5mm}{10mm}{\flagwidth}
   \framecode{}
   \end{flagdescription}
   \end{tikzpicture}
}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\medskip
The various types of stars \command{\tb starV} \command{\tb starVI}
\command{\tb starn} and \command{\tb moon} are self-explanatory.
In the following example \tt{\tb starn} and \tt{\tb moon}
are overlayed with the generating circles.

%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\codebox{0.65}{55mm}{%
   \tb begin\{tikzpicture\}
   \tb begin\{flagdescription\}\{1/3\}\\
   \xx3\tb background\{cyan\}\\
     \xx3\tb starV\{white\}\{(1,0.5)\}\{0.3\}\{0\}\\
     \xx3\tb starVI\{white\}\{(2,0.5)\}\{0.3\}\{0\}\\
%    \xx3\tb framecode{}\\
   \tb end\{flagdescription\}
   \tb end\{tikzpicture\}\\
   \tb par\tb medskip\\
   \tb begin\{tikzpicture\}
   \tb begin\{flagdescription\}\{1/3\}\\
     \xx3\tb background\{cyan\}\\
     \xx3\tb starn\{white\}\{9\}\{(2,0.5)\}\{0.4\}\{0.15\}\{0\} \\
     \xx3\tb draw (2,0.5)circle(0.4) (2,0.5)circle(0.15); \\
     \xx3\tb moon\{white\}\{(1,0.45)\}\{0.4\}\{(1.1,0.6)\}\{0.36\}\\
     \xx3\tb draw (1,0.45)circle(0.4) (1.1,0.6)circle(0.36);\\
%    \xx3\tb framecode{}\\
   \tb end\{flagdescription\}
   \tb end\{tikzpicture\}
   }
\resultbox{0.34}{55mm}{%
   \begin{tikzpicture}
   \begin{flagdescription}{1/3}
     \background{cyan}
     \starV{white}{(1,0.5)}{0.3}{0}
     \starVI{white}{(2,0.5)}{0.3}{0}
%     \framecode{}
   \end{flagdescription}
   \end{tikzpicture}
   \par\medskip
   \begin{tikzpicture}
   \begin{flagdescription}{1/3}
     \background{cyan}
     \starn{white}{9}{(2,0.5)}{0.4}{0.15}{0}
     \draw (2,0.5)circle(0.4) (2,0.5) circle(0.15);
     \moon{white}{(1,0.45)}{0.4}{(1.1,0.6)}{0.36}
     \draw (1,0.45)circle(0.4) (1.1,0.6)circle(0.36);
%     \framecode{}
   \end{flagdescription}
   \end{tikzpicture}
}
%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

\iftrue
% --------------------------------------------------------------------------
\chapter{Flags}\label{FLAGS}
% --------------------------------------------------------------------------

%\iffalse
\flagsdefault[width=18mm,length=30mm,stretch=0.5]

\section{National Flags of sovereign states}
% ------------------------------------------
\flaggenprozeile{4}
\show{Afghanistan}{AF}
\show{Albania}{AL}
\show{Algeria}{DZ}
\show{Andorra}{AD}
\show{Angola}{AO}
\show{Antigua \& Barbuda}{AG}
\show{Argentina}{AR}
\show{Armenia}{AM}
\show{Australia}{AU}
\show{Austria}{AT}
\show{Azerbaijan}{AZ}
\show{Bahamas}{BS}
\show{Bahrein}{BH}
\show{Bangladesh}{BD}
\show{Barbados}{BB}
\show{Belarus}{BY}
\show{Belgium}{BE}
\show{Belize}{BZ}
\show{Benin}{BJ}
\show{Bhutan}{BT}
\show{Bolivia}{BO}
\show{Bosnia \& Herzogovina}{BA}
\show{Botswana}{BW}
\show{Brazil}{BR}
\show{Brunei}{BN}
\show{Bulgaria}{BG}
\show{Burkina Faso}{BF}
\show{Burundi}{BI}
\show{Cambodia}{KH}
\show{Cameroon}{CM}
\show{Canada}{CA}
\show{Cape Verde}{CV}
\show{Central African Rep.}{CF}
\show{Chad}{TD}
\show{Chile}{CL}
\show{China}{CN}
\show{Colombia}{CO}
\show{Comoros}{KM}
\show{Congo, Democratic Rep.}{CD}
\show{Congo, Republic}{CG}
\show{Cook Islands}{CK}
\show{Costa Rica}{CR}
\show{Croatia}{HR}
\show{Cuba}{CU}
\show{Cyprus}{CY}
\show{Czech Republic}{CZ}
\show{Denmark}{DK}
\show{Djibouti}{DJ}
\show{Dominica}{DM}
\show{Dominican Republic}{DO}
\show{East Timor}{TL}
\show{Ecuador}{EC}
\show{Egypt}{EG}
\show{EL Salvador}{SV}
\show{Equatorial Guinea}{GQ}
\show{Eritrea}{ER}
\show{Estonia}{EE}
\show{Eswatini}{SZ}
\show{Ethiopia}{ET}
\show{Fiji}{FJ}
\show{Finnland}{FI}
\show{France}{FR}
\show{Gabon}{GA}
\show{Gambia}{GM}
\show{Georgia}{GE}
\show{Germany}{DE}
\show{Ghana}{GH}
\show{Greece}{GR}
\show{Grenada}{GD}
\show{Guatemala}{GT}
\show{Guinea}{GN}
\show{Guinea Bissau}{GW}
\show{Guyana}{GY}
\show{Haiti}{HT}
\show{Honduras}{HN}
\show{Hungary}{HU}
\show{Iceland}{IS}
\show{India}{IN}
\show{Indonesia}{ID}
\show{Iran}{IR}
\show{Iraq}{IQ}
\show{Ireland}{IE}
\show{Israel}{IL}
\show{Italy}{IT}
\show{Ivory Coast}{CI}
\show{Jamaica}{JM}
\show{Japan}{JP}
\show{Jordan}{JO}
\show{Kazakhstan}{KZ}
\show{Kenya}{KE}
\show{Kiribati}{KI}
\show{Korea, North}{KP}
\show{Korea, South}{KR}
\show{Kosovo}{KO}
\show{Kuwait}{KW}
\show{Kyrgystan}{KG}
\show{Laos}{LA}
\show{Latvia}{LV}
\show{Lebanon}{LB}
\show{Lesotho}{LS}
\show{Liberia}{LR}
\show{Libya}{LY}
\show{Liechtenstein}{LI}
\show{Lithuania}{LT}
\show{Luxembourg}{LU}
\show{Madagaskar}{MG}
\show{Malawi}{MW}
\show{Malaysia}{MY}
\show{Maledives}{MV}
\show{Mali}{ML}
\show{Malta}{MT}
\show{Marshall Islands}{MH}
\show{Mauritania}{MR}
\show{Mauritius}{MU}
\show{Mexico}{MX}
\show{Micronesia}{FM}
\show{Moldova}{MD}
\show{Monaco}{MC}
\show{Mongolia}{MN}
\show{Montenegro}{ME}
\show{Morocco}{MA}
\show{Mozambique}{MZ}
\show{Myanmar}{MM}
\show{Namibia}{NA}
\show{Nauru}{NR}
\show{Nepal}{NP}
\show{Netherlands}{NL}
\show{New Zealsnd}{NZ}
\show{Nicaragua}{NI}
\show{Niger}{NE}
\show{Nigeria}{NG}
\show{North Macedonia}{MK}
\show{Norway}{NO}
\show{Oman}{OM}
\show{Pakistan}{PK}
\show{Palau}{PW}
\show{Palestine}{PS}
\show{Panama}{PA}
\show{Papua New Guinea}{PG}
\show{Paraguay}{PY}
\show{Peru}{PE}
\show{Philippines}{PH}
\show{Poland}{PL}
\show{Portugal}{pt}
\show{Quatar}{QA}
\show{Romania}{RO}
\show{Russia}{RU}
\show{Rwanda}{RW}
\show{St. Kitts \& Nevis}{KN}
\show{St. Lucia}{LC}
\show{St. Vincent}{VC}
\show{Samoa}{WS}
\show{San Marino}{SM}
\show{Sao Tome \& Principe}{ST}
\show{Saudi Arabia}{SA}
\show{Senegal}{SN}
\show{Serbia}{RS}
\show{Seychelles}{SC}
\show{Sierra Leone}{SL}
\show{Singapore}{SG}
\show{Slovakia}{SK}
\show{Slovenia}{SI}
\show{Solomon Islands}{SB}
\show{Somalia}{SO}
\show{South Africa}{ZA}
\show{South Sudan}{SS}
\show{Spain}{ES}
\show{Sri Lanka}{LK}
\show{Sudan}{SD}
\show{Suriname}{SR}
\show{Sweden}{SE}
\show{Switzerland}{CH}
\show{Syria}{SY}
\show{Taiwan}{TW}
\show{Tajikistan}{TJ}
\show{Tanzania}{TZ}
\show{Thailand}{TH}
\show{Togo}{TG}
\show{Tonga}{TO}
\show{Trinidad \& Tobago}{TT}
\show{Tunisia}{TN}
\show{Turkey}{TR}
\show{Turkmenistan}{TM}
\show{Tuvalu}{TV}
\show{Uganda}{UG}
\show{Ukraine}{UA}
\show{United Arab Emirates}{AE}
\show{United Kingdom}{GB}
\show{United States}{US}
\show{Uruguay}{UY}
\show{Uzbekistan}{UZ}
\show{Vanuatu}{VU}
\show{Vatican}{VA}
\show{Venezuela}{VE}
\show{Vietnam}{VN}
\show{Yemen}{YE}
\show{Zambia}{ZM}
\show{Zimbabwe}{ZW}

\subsection*{Variants}
% --------------------

\flaggenprozeile{4}
\flagsdefault[emblem,variant=0]\show{Austria: Variant 0}{AT}
\flagsdefault[emblem,variant=1]\show{Austria: Variant 1}{AT}
\flagsdefault[emblemdefault,variant=0]

\section{Historical and outdated flags}
% -------------------------------------

\flaggenprozeile{4}
\show{Soviet Union}{SU}

\section{Flags of other countries and territories}
% ------------------------------------------------

\flaggenprozeile{4}
\show{Abkhazia}{Abkhazia}
\show{\AA land}{AX}
\show{Antarctica}{AQ}
\show{Artsakh}{Artsakh}
\show{Bonaire}{Bonaire}
\show{Faroe Islands}{FO}
\show{French Guiana}{GF}
\show{Gibraltar}{GI}
\show{Greenland}{GL}
\show{Guernsey}{GG}
\show{Isle of Man}{IM}
\show{Jersey}{JE}
\show{Niue}{NU}
\show{Puerto Rico}{PR}
\show{Reunion}{RE}
\show{St.\,Eustasius}{StEustasius}
\show{Somaliland}{Somaliland}
\show{Tibet}{Tibet}
\show{Transnistria}{Transnistria}
\show{Western Sahara}{EH}

\section{Austrian federal states}
% -------------------------------

\flaggenprozeile{4}
\show{Vienna}{AT-W}
\show{Lower Austria}{AT-N}
\show{Upper Austria}{AT-O}
\show{Salzburg}{AT-S}
\show{The Tyrol}{AT-T}
\show{Vorarlberg}{AT-V}
\show{Carinthia}{AT-K}
\show{Styria}{AT-St}
\show{Burgenland}{AT-B}

\newpage
\section{Italian Regions}
% -----------------------

\flaggenprozeile{4}
\flagsdefault[variant=1]\show{Abruzzo}{IT-AB}\flagsdefault[variant=0]
\show{Alto Adige}{IT-AA}
\show{Aosta}{IT-AO}
\show{Basilicata}{IT-BA}
\show{Calabria}{IT-CL}
\show{Campania}{IT-CM}
\show{Emilia Romagna}{IT-EM}
\show{Friuli Venezia Giulia}{IT-FR}
\show{Lazio}{IT-LA}
\show{Liguria}{IT-LI}
\show{Lombardia}{IT-LO}
\show{Marche}{IT-MA}
\show{Molise}{IT-MO}
\show{Piemonte}{IT-PI}
\show{Puglia}{IT-PU}
\show{Sardegna}{IT-SA}
\show{Sicilia}{IT-SI}
\show{Toscana}{IT-TO}
\show{Trentino}{IT-TN}
\show{Trentino-Alto Adige}{IT-TA}
\show{Umbria}{IT-UM}
\flagsdefault[variant=1]\show{Veneto}{IT-VE}\flagsdefault[variant=0]

\subsection*{Variants}
% --------------------

\flaggenprozeile{4}
\flagsdefault[variant=0]\show{Veneto: Variant 0}{IT-VE}
\flagsdefault[variant=1]\show{Veneto: Variant 1}{IT-VE}
\flagsdefault[variant=2]\show{Veneto: Variant 2}{IT-VE}
\flagsdefault[variant=3]\show{Veneto: Variant 3}{IT-VE}
\flagsdefault[variant=0]\show{Abruzzo: Variant 0}{IT-AB}
\flagsdefault[variant=1]\show{Abruzzo: Variant 1}{IT-AB}
\flagsdefault[variant=0]\show{Toscana: Variant 0}{IT-TO}
\flagsdefault[variant=1]\show{Toscana: Variant 1}{IT-TO}
\flagsdefault[variant=0]\show{Trentino: Variant 0}{IT-TN}
\flagsdefault[variant=1]\show{Trentino: Variant 1}{IT-TN}

\section{Other Flags}
% ----------------------

\flaggenprozeile{4}
\show{European Union}{EU}
\show{United Nations}{UNO}
\show{WHO}{WHO}
\show{UNESCO}{UNESCO}
\show{NATO}{NATO}
\show{Christian Flag}{Christian}
\show{Buddhist Flag}{Buddhism}
\show{Red Cross}{RedCross}
\show{Red Crescent}{RedCrescent}
\show{Red Crystal}{RedCrystal}
\show{Olympics}{Olympics}
\show{Jolly Roger}{JollyRoger}
\show{Rainbow flag}{Rainbow}
\show{Esperanto Movement}{Esperanto}

\newpage
\section{Nautical Signal Flags}
% -----------------------------

\flagsdefault[width=18mm,length=25mm]
\flaggenprozeile{5}
\show{}{A}
\show{}{B}
\show{}{C}
\show{}{D}
\show{}{E}
\show{}{F}
\show{}{G}
\show{}{H}
\show{}{I}
\show{}{J}
\show{}{K}
\show{}{L}
\show{}{M}
\show{}{N}
\show{}{O}
\show{}{P}
\show{}{Q}
\show{}{R}
\show{}{S}
\show{}{T}
\show{}{U}
\show{}{V}
\show{}{W}
\show{}{X}
\show{}{Y}
\show{}{Z}\par\bigskip

\flagsdefault[width=0mm,length=25mm]
\flaggenprozeile{5}
\show{}{0}
\show{}{1}
\show{}{2}
\show{}{3}
\show{}{4}
\show{}{5}
\show{}{6}
\show{}{7}
\show{}{8}
\show{}{9}

% --------------------------------------------------------------------------
% Links
% --------------------------------------------------------------------------
{
\raggedright
\def\web#1{{\color{emphcolor}\texttt{#1}}: }
\def\txt#1{#1}
\def\bibname{Links}
% \addcontentsline{toc}{chapter}{\bibname}

\begin{thebibliography}{88}
% ---------------------------------------------------------------------------
\bibitem{VEXILLAMUNDI}
\web{http://www.vexilla-mundi.com}
\txt{Comprehensive website with flags of all nations including construction
     sheets, historical flags, flags of many cities and regions.}
% ---------------------------------------------------------------------------
\bibitem{FOTW}
\web{https://www.fotw.info}
\txt{Website of the FOTW (``Flags Of The World''), vexillological association
 and internet resource; many background informations about flags and vexillology.}
% ---------------------------------------------------------------------------
\bibitem{FLAGS}
\web{https://www.flags.net}
\txt{World Flags Database; another comprehensive collection of flags
from all over the world.}
% ---------------------------------------------------------------------------
\bibitem{WELTFLAGGEN}
\web{https://www.welt-flaggen.de}
\txt{Flags of and information about all countries of the world;
contains flag quizzes.}

% ---------------------------------------------------------------------------
\bibitem{NATIONALFLAGGEN}
\web{https://www.nationalflaggen.de}
\txt{Provides various images and animated gifs of all national flags.}
\end{thebibliography}
% ---------------------------------------------------------------------------
}
\fi


\end{document}