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% !TeX root = mercatormap.tex
% !TeX encoding=UTF-8
% !TeX spellcheck=en_US
% include file of mercatormap.tex (manual of the LaTeX package mercatormap)
\clearpage
\section{Routes}\label{sec:routes}%
Routes are \tikzname\ |path| objects which can be drawn with the appropriate
\tikzname\ macros and the coordinate system documented in
\Fullref{sec:map_definition}.
Nevertheless, in the following some alternatives are described which allow
to specify a path by a sequence of points (\refCom{mrcpoint}).
The idea is that such a sequence of points is exported by a third-party
application for inclusion in a \LaTeX\ map, see \Fullref{sec:routes_gpx}.
%-------------------------------------------------------------------------------
\subsection{Route Path Definition}
\begin{docEnvironment}{mrcroute}{\oarg{options}}
This environment creates a \tikzname\ |path| with given \tikzname\ \meta{options}.
The \meta{environment content} is a sequence of points made by \refCom{mrcpoint}.
\begin{dispListing}
\begin{mrcroute}[red, very thick]
\mrcpoint{48.137222}{11.575556}
\mrcpoint{49.019479}{12.0976942}
...
\end{mrcroute}
\end{dispListing}
Note that a map definition by \refCom{mrcdefinemap}, \refCom{mrcmap},
or \refCom{mrcapplymap} is needed before a route |path| can be drawn.\par
%A |path| can be closed by adding \docAuxCommand{pgfpathclose} as last entry
%after all \refCom{mrcpoint} macros. Further |pgf| commands may be added,
%but the sequence should start with a \refCom{mrcpoint}.
\end{docEnvironment}
\begin{docEnvironment}{mrcroute*}{\oarg{options}}
Identical to \refEnv{mrcroute}, but the created \tikzname\ |path| is
closed.
\end{docEnvironment}
\begin{docCommand}{mrcrouteinput}{\oarg{options}\marg{filename}}
Identical to \refEnv{mrcroute}, but the sequence of points is included
from a file with the given \meta{filename}.
\end{docCommand}
\begin{docCommand}{mrcrouteinput*}{\oarg{options}\marg{filename}}
Identical to \refCom{mrcrouteinput}, but the created \tikzname\ |path| is
closed.
\end{docCommand}
\begin{docCommand}{mrcpoint}{\marg{latitude}\marg{longitude}}
Specifies a single coordinate point with given \meta{latitude} and
\meta{longitude} as part of sequence inside \refEnv{mrcroute}.\par
This is a wrapper for |\pgfpathmoveto| respectively |\pgfpathlineto|.
\end{docCommand}
\begin{docMrcKey}{every route}{=\meta{options}}{no default, initially empty}
Sets \tikzname\ \meta{options} which are applied to every
\refEnv{mrcroute} and \refCom{mrcrouteinput}.
\end{docMrcKey}
\tikzsetnextfilename{routes_example}%
\begin{dispExample*}{center lower}
% \mrcsetapikey{thunderforest}{YOUR-API-KEY} % registered key
\begin{tikzpicture}
\mrcmap[type=areafit,
west=5,east=15,south=47,north=55,
source=thunderforest neighbourhood,
tex width=14cm, tex height=14cm,
flex area fit=5mm
]{routes_example}
\mrcdrawmap
\node[below,font=\fontsize{7pt}{7pt}\sffamily] at (mrcmap.south)
{\mrcmapattribution};
\mrcclipmap
\path[draw] (mrcmap.south west) rectangle (mrcmap.north east);
\begin{mrcroute}[blue,line width=0.4mm,line cap=round,
line join=round,double=blue!5!white,double distance=0.4mm]
\mrcpoint{48.137222}{11.575556}
\mrcpoint{49.019479}{12.0976942}
\mrcpoint{49.45522}{11.07631}
\mrcpoint{50.978056}{11.029167}
\mrcpoint{52.518611}{13.408333}
\end{mrcroute}
\end{tikzpicture}
\end{dispExample*}
\clearpage
%-------------------------------------------------------------------------------
\subsection{Example Python Conversion Scripts for gpx}\label{sec:routes_gpx}
The following scripts are examples for conversions from a standard
routes and tracks of |gpx| files to \LaTeX\ include files
(assuming a single route/track per file).
\begin{dispListing*}{title=Python 3 script to convert \texttt{route.gpx} to
a sequence of points file \texttt{route.inc},
documentation minted language=python}
import xmltodict
with open('route.gpx', encoding='utf-8') as gpx:
doc = xmltodict.parse(gpx.read())
with open('route.inc', "w", encoding="utf-8") as inc:
for rtept in doc['gpx']['rte']['rtept']:
lat = rtept['@lat']
lon = rtept['@lon']
inc.write(f'\\mrcpoint{{{lat}}}{{{lon}}}\n')
\end{dispListing*}
\begin{dispListing*}{title=Python 3 script to convert \texttt{track.gpx} to
a sequence of points file \texttt{track.inc},
documentation minted language=python}
import xmltodict
with open('track.gpx', encoding='utf-8') as gpx:
doc = xmltodict.parse(gpx.read())
with open('track.inc', "w", encoding="utf-8") as inc:
for trkpt in doc['gpx']['trk']['trkseg']['trkpt']:
lat = trkpt['@lat']
lon = trkpt['@lon']
inc.write(f'\\mrcpoint{{{lat}}}{{{lon}}}\n')
\end{dispListing*}
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