require 'gpx_ruby'

# read a gpx file
gpx_file = GpxRuby::File './my_gpx_file.gpx'
puts gpx_file.creator
puts gpx_file.version

# or read a xml string
xml = '
<?xml version="1.0" encoding="UTF-8"?>
<gpx
  version="1.1"
  creator="RunKeeper - http://www.runkeeper.com"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns="http://www.topografix.com/GPX/1/1"
  xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"
  xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1">
	<trk>
		<name><![CDATA[Running 10/8/14 8:24 pm]]></name>
		<time>2014-10-08T18:24:54Z</time>
		<trkseg>
			<trkpt lat="46.920356000" lon="7.486769000"><ele>507.0</ele><time>2014-10-08T18:24:54Z</time></trkpt>
			<trkpt lat="46.920307000" lon="7.486907000"><ele>507.0</ele><time>2014-10-08T18:29:31Z</time></trkpt>
		</trkseg>
	</trk>  
</gpx>
'
gpx_file = GpxRuby::XML xml

#list all tracks
puts gpx.tracks

#get first track
track = gpx.tracks.first

#compute total distance
track.distance

#list all points of a track
puts track.points

#list all segments of a track
puts track.segments

#list all points of a segment
segment = track.segments.first
puts segment.points

#get a single point
track.points.first
track.points[0]

segment.points.first
segment.points[0]

#get lat / lon
point = track.points.first
puts point.lat
puts point.lon
puts point.to_a #get array [lat,lon]
puts point.to_h #get hash { lat: lat, lon: lon }

#compute total distance
segment.distance

#get center of gravity
puts segment.center_of_gravity
puts track.center_of_gravity