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Marey graphs are a visualization form typically used for timetables. Time
is on the x-axis and position on the y-axis. This module reads data from a
transitfeed.Schedule and creates a marey graph in svg/xml format. The graph
shows the speed between stops for each trip of a route.
TODO: This module was taken from an internal Google tool. It works but is not
well intergrated into transitfeed and schedule_viewer. Also, it has lots of
ugly hacks to compensate set canvas size and so on which could be cleaned up.
For a little more information see (I didn't make this URL ;-)
http://transliteracies.english.ucsb.edu/post/research-project/research-clearinghouse-individual/research-reports/the-indexical-imagination-marey%e2%80%99s-graphic-method-and-the-technological-transformation-of-writing-in-the-nineteenth-century
MareyGraph: Class, keeps cache of graph data and graph properties
and draws marey graphs in svg/xml format on request.
If called without arguments, the data generated in the previous call
will be used. New decorators can be added between calls.
Args:
# Class Stop is defined in transitfeed.py
stoplist: [Stop, Stop, ...]
# Class Trip is defined in transitfeed.py
triplist: [Trip, Trip, ...]
Returns:
# A string that contain a svg/xml web-page with a marey graph.
" <svg width="1440" height="520" version="1.1" ... "
s %s %s %s %s( R R t _gheightR t _slistR t _BuildStationsR t _DrawBoxt
_DrawHourst
_DrawStationst
_DrawTripst _DrawHeadert _DrawDecoratorst _DrawFooter( R t stoplistt triplistt heightt output( ( sK /var/www/bus/origin-src/transitfeed-1.2.5/gtfsscheduleviewer/marey_graph.pyt DrawH s( c C sK d | j | j d | j d | j | j d | j | j | j f } | S( NsY
<svg width="%s" height="%s" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<script type="text/ecmascript"><![CDATA[
function init(evt) {
if ( window.svgDocument == null )
svgDocument = evt.target.ownerDocument;
}
var oldLine = 0;
var oldStroke = 0;
var hoffset= %s; // Data from python
function parseLinePoints(pointnode){
var wordlist = pointnode.split(" ");
var xlist = new Array();
var h;
var m;
// TODO: add linebreaks as appropriate
var xstr = " Stop Times :";
for (i=0;i<wordlist.length;i=i+2){
var coord = wordlist[i].split(",");
h = Math.floor(parseInt((coord[0])-20)/60);
m = parseInt((coord[0]-20))%%60;
xstr = xstr +" "+ (hoffset+h) +":"+m;
}
return xstr;
}
function LineClick(tripid, x) {
var line = document.getElementById(tripid);
if (oldLine)
oldLine.setAttribute("stroke",oldStroke);
oldLine = line;
oldStroke = line.getAttribute("stroke");
line.setAttribute("stroke","#fff");
var dynTxt = document.getElementById("dynamicText");
var tripIdTxt = document.createTextNode(x);
while (dynTxt.hasChildNodes()){
dynTxt.removeChild(dynTxt.firstChild);
}
dynTxt.appendChild(tripIdTxt);
}
]]> </script>
<style type="text/css"><![CDATA[
.T { fill:none; stroke-width:1.5 }
.TB { fill:none; stroke:#e20; stroke-width:2 }
.Station { fill:none; stroke-width:1 }
.Dec { fill:none; stroke-width:1.5 }
.FullHour { fill:none; stroke:#eee; stroke-width:1 }
.SubHour { fill:none; stroke:#ddd; stroke-width:1 }
.Label { fill:#aaa; font-family:Helvetica,Arial,sans;
text-anchor:middle }
.Info { fill:#111; font-family:Helvetica,Arial,sans;
text-anchor:start; }
]]></style>
<text class="Info" id="dynamicText" x="0" y="%d"></text>
<g id="mcanvas" transform="translate(%s,%s)">
<g id="zcanvas" transform="scale(%s)">
i i i
( R R
R R R R ( R t
fill="lightgrey" stroke="%s" stroke-width="2" />
Args:
# Class Stop is defined in transitfeed.py
stoplist: [Stop, Stop, ...]
# Class Trip is defined in transitfeed.py
triplist: [Trip, Trip, ...]
Returns:
# One integer y-coordinate for each station normalized between
# 0 and X, where X is the height of the graph in pixels
[0, 33, 140, ... , X]
Uses the stoplists long/lats to approximate distances
between stations and build a list with y-coordinates for the
horizontal lines in the graph.
Args:
# Class Stop is defined in transitfeed.py
stoplist: [Stop, Stop, ...]
Returns:
# One integer for each pair of stations
# indicating the approximate distance
[0,33,140, ... ,X]
Args:
# One integer for each pair of stations
# indicating the approximate distance
dists: [0,33,140, ... ,X]
Returns:
# One integer y-coordinate for each station normalized between
# 0 and X, where X is the height of the graph in pixels
[0, 33, 140, ... , X]
i i ( t sumt floatR t enumeratet int( R R) t tot_distt dt
pixel_distt it pdt
Uses a timetable to approximate distances
between stations
Args:
# Class Trip is defined in transitfeed.py
triplist: [Trip, Trip, ...]
# (Optional) Index of Triplist prefered for timetable Calculation
index: 3
Returns:
# One integer for each pair of stations
# indicating the approximate distance
[0,33,140, ... ,X]
i i i i ( t lenR* R+ t GetTimeStops( R R t indexR@ t tripR/ R0 t t_dists2( ( R sK /var/www/bus/origin-src/transitfeed-1.2.5/gtfsscheduleviewer/marey_graph.pyt _TravelTimes s "
Args:
# Class Trip is defined in transitfeed.py
[Trip, Trip, ...]
Returns:
# A string containing a polyline tag for each trip
' <polyline class="T" stroke="#336633" points="433,0 ...'
service_idt appendR5 RC RA t hexRB R4 t trip_idR, t FormatSecondsSinceMidnightt GetStartTimeR t NoneR
R R$ ( R R t colparR( t tmpstrst servlistt tt shadet colort
start_offsetst
first_stopt jt freq_offsett
scriptcallt
tmpstrheadR9 t st arr_tt dep_tt arr_xt dep_x( ( sK /var/www/bus/origin-src/transitfeed-1.2.5/gtfsscheduleviewer/marey_graph.pyR ) sP
*
Args:
# Class Stop is defined in transitfeed.py
stations: [Stop, Stop, ...]
Returns:
# A string containing a polyline tag for each stop
" <polyline class="Station" stroke="#336633" points="20,0 ..."
Returns:
# A string containing a polyline tag for each grid line
" <polyline class="FullHour" points="20,0 ..."
RL R R R$ ( R RS R9 ( ( sK /var/www/bus/origin-src/transitfeed-1.2.5/gtfsscheduleviewer/marey_graph.pyR { s '
Args:
# Integer, index of stop to be highlighted.
index: 4
# An optional string with a html color code
color: "#fff"
Args:
# Class Trip is defined in transitfeed.py
triplist: [Trip, Trip, ...]
# An optional string with a html color code
color: "#fff"
1.0 is the original canvas size.
Args:
# float value between 0.0 and 5.0
newfactor: 0.7
N( t __name__t
__module__t __doc__Rk R< R RQ R! R R R R R R& R' RF RG R RJ R R Ri Rj Rm Rn Ro Rp Rr Rz ( ( ( sK /var/www/bus/origin-src/transitfeed-1.2.5/gtfsscheduleviewer/marey_graph.pyR ( s4 ) E $ : ( ( R} R* R, R ( ( ( sK /var/www/bus/origin-src/transitfeed-1.2.5/gtfsscheduleviewer/marey_graph.pyt <module>" s
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