def read_track_from_gpx(self, filepath, filebase, trackfolder,
colourIndex):
"""
Read a single GPX file and extract the track(s), converting them to a
list of KML tracks. Append or replace each track in the trackfolder.
This fills the trackfolder in makekml.
Arguments:
filepath: the full path to the GPX file
filebase: the basename of the GPX file, used to name the KML tracks
trackfolder: a KML.Folder to hold track Placemarks
colourIndex: the next colourIndex to use when creating a linestyle
On successful exit, trackfolder and colourIndex will have been updated.
"""
args = self.config['arguments']
gpxtree = etree.parse(filepath).getroot()
namespace = gpxtree.nsmap[None]
if self.verbosity > 1:
print('namespace for ' + filepath + ': ' + namespace,
file=sys.stderr)
print('{%s}trk' % namespace, file=sys.stderr)
print(namespace + 'trk', file=sys.stderr)
for gpxtrack in gpxtree.getiterator('{%s}trk' % namespace):
print('got here', file=sys.stderr)
# Extract the track name from the GPX track
try:
trackname = gpxtrack.find('{%s}name' % namespace).text
except:
print('track does not have name in ' + filepath,
file=sys.stderr)
trackname = filebase
print('trackname = ' + trackname, file=sys.stderr)
# does a Placemark already exist with this name?
placemark = None
for pm in trackfolder.findall('GX.Placemark'):
if pm.find('KML.name').text == trackname:
placemark = pm
break
if 'replace' in args and args['replace']:
trackfolder.drop(placemark)
placemark = None
if not placemark:
# Create a new Placemark to hold the KML track(s)
colourID = '#colour' + str(self.colourIndex)
self.colourIndex = (self.colourIndex + 1) % self.colourSetLen
placemark = KML.Placemark(
KML.visibility('1'), KML.name(trackname),
KML.description(trackname + ' from ' + filebase),
KML.styleUrl(colourID))
trackfolder.append(placemark)
tracklist = []
for gpxtrkseg in gpxtrack.getiterator('{%s}trkseg' %
namespace):
# A GPX trkseg translates into aGX.track
kmltrack = GX.Track(KML.altitudeMode('clampToGround'))
whenlist = []
coordlist = []
for gpxtrkpoint in gpxtrkseg:
lat = gpxtrkpoint.attrib['lat']
lon = gpxtrkpoint.attrib['lon']
alt = gpxtrkpoint.find('{%s}ele' % namespace).text
time = gpxtrkpoint.find('{%s}time' % namespace).text
whenlist.append(GX.when(time))
coordlist.append(
GX.coord('{0} {1} {2}'.format(lon, lat, alt)))
for w in whenlist:
kmltrack.append(w)
for c in coordlist:
kmltrack.append(c)
tracklist.append(kmltrack)
if tracklist:
if len(tracklist) > 1:
multitrack = GX.MultiTrack()
for t in tracklist:
multitrack.append(t)
placemark.append(multitrack)
else:
placemark.append(tracklist[0])
else:
print('no tracks found in ' + filepath, file=sys.stderr)
