Initial import of gpx gem.

README

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+= GPX Gem
+Copyright (C) 2006  Doug Fales
+Doug Fales mailto:doug.fales@gmail.com
+
+== What It Does
+This library reads GPX files and provides an API for reading and manipulating
+the data as objects.  For more info on the GPX format, see
+http://www.topografix.com/gpx.asp.
+
+In addition to parsing GPX files, this library is capable of converting
+Magellan NMEA files to GPX, and writing new GPX files.  It can crop and delete
+rectangular areas within a file, and it also calculates some meta-data about
+the tracks and points in a file (such as distance, duration, average speed,
+etc).
+
+== Examples
+Reading a GPX file, and cropping its contents to a given area:
+         gpx =  GPX::GPXFile.new(:gpx_file => filename)   # Read GPX file
+         bounds = GPX::Bounds.new(params)                 # Create a rectangular area to crop
+         gpx.crop(bounds)                                 # Crop it
+         gpx.write(filename)                              # Save it
+
+Converting a Magellan track log to GPX:
+      if GPX::MagellanTrackLog::is_magellan_file?(filename)
+         GPX::MagellanTrackLog::convert_to_gpx(filename, "#{filename}.gpx")
+      end
+
+
+== Notes
+This library was written to bridge the gap between my Garmin Geko
+and my website, WalkingBoss.org.  For that reason, it has always been more of a
+work-in-progress than an attempt at full GPX compliance.  The track side of the
+library has seen much more use than the route/waypoint side, so if you're doing
+something with routes or waypoints, you may need to tweak some things.  
+
+Since this code uses REXML to read an entire GPX file into memory, it is not
+the fastest possible solution for working with GPX data, especially if you are
+working with tracks from several days or weeks.  
+
+Finally, it should be noted that none of the distance/speed calculation or
+crop/delete code has been tested under International Date Line-crossing
+conditions.  That particular part of the code will likely be unreliable if
+you're zig-zagging across 180 degrees longitude routinely.

Rakefile

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+require 'rubygems'
+require 'rake'
+require 'rake/testtask'
+require 'rake/rdoctask'
+require 'rake/gempackagetask'
+require File.dirname(__FILE__) + '/lib/gpx'
+
+PKG_VERSION = GPX::VERSION
+PKG_NAME = "gpx"
+PKG_FILE_NAME = "#{PKG_NAME}-#{PKG_VERSION}"
+RUBY_FORGE_PROJECT = "gpx"
+RUBY_FORGE_USER = ENV['RUBY_FORGE_USER'] || "dougfales"
+RELEASE_NAME = "#{PKG_NAME}-#{PKG_VERSION}"
+
+PKG_FILES = FileList[
+    "lib/**/*", "bin/*", "tests/**/*", "[A-Z]*", "Rakefile", "doc/**/*"
+]
+
+desc "Default Task"
+task :default => [ :test ]
+
+# Run the unit tests
+desc "Run all unit tests"
+Rake::TestTask.new("test") { |t|
+  t.libs << "lib"
+  t.pattern = 'tests/*_test.rb'
+  t.verbose = true
+}
+
+# Make a console, useful when working on tests
+desc "Generate a test console"
+task :console do
+   verbose( false ) { sh "irb -I lib/ -r 'gpx'" }
+end
+
+# Genereate the RDoc documentation
+desc "Create documentation"
+Rake::RDocTask.new("doc") { |rdoc|
+  rdoc.title = "Ruby GPX API"
+  rdoc.rdoc_dir = 'html'
+  rdoc.rdoc_files.include('README')
+  rdoc.rdoc_files.include('lib/**/*.rb')
+}
+
+# Genereate the package
+spec = Gem::Specification.new do |s|
+
+  s.name = 'gpx'
+  s.version = PKG_VERSION
+  s.summary = <<-EOF
+   A basic API for reading and writing GPX files.
+  EOF
+  s.description = <<-EOF
+   A basic API for reading and writing GPX files.
+  EOF
+
+  s.files = PKG_FILES
+
+  s.require_path = 'lib'
+  s.autorequire = 'gpx'
+
+  s.has_rdoc = true
+
+  s.author = "Doug Fales"
+  s.email = "doug.fales@gmail.com"
+  s.homepage = "http://gpx.rubyforge.com/"
+end
+
+Rake::GemPackageTask.new(spec) do |pkg|
+  pkg.need_zip = true
+  pkg.need_tar = true
+end
+
+desc "Report code statistics (KLOCs, etc) from the application"
+task :stats do
+  require 'code_statistics'
+  CodeStatistics.new(
+    ["Library", "lib"],
+    ["Units", "tests"]
+  ).to_s
+end

lib/gpx.rb

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+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+$:.unshift(File.dirname(__FILE__))
+require 'rexml/document'
+require 'date'
+require 'time'
+require 'csv'
+require 'gpx/gpx'
+require 'gpx/gpx_file'
+require 'gpx/bounds'
+require 'gpx/track'
+require 'gpx/route'
+require 'gpx/segment'
+require 'gpx/point'
+require 'gpx/trackpoint'
+require 'gpx/waypoint'
+require 'gpx/magellan_track_log'

lib/gpx/bounds.rb

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+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+   class Bounds < Base
+      attr_accessor :min_lat, :max_lat, :max_lon, :min_lon, :center_lat, :center_lon
+
+      # Creates a new bounds object with the passed-in min and max longitudes
+      # and latitudes.
+      def initialize(opts = { :min_lat => 90.0, :max_lat => -90.0, :min_lon => 180.0, :max_lon => -180.0})
+         @min_lat, @max_lat  = opts[:min_lat].to_f, opts[:max_lat].to_f
+         @min_lon, @max_lon  = opts[:min_lon].to_f, opts[:max_lon].to_f
+      end
+
+      # Returns the middle latitude.
+      def center_lat
+         distance = (max_lat - min_lat)/2.0
+         (min_lat + distance)
+      end
+
+      # Returns the middle longitude.
+      def center_lon
+         distance = (max_lon - min_lon)/2.0
+         (min_lon + distance)
+      end
+
+      def to_xml
+         bnd = REXML::Element.new('bounds')
+         bnd.attributes['min_lat'] = min_lat
+         bnd.attributes['min_lon'] = min_lon
+         bnd.attributes['max_lat'] = max_lat
+         bnd.attributes['max_lon'] = max_lon
+         bnd
+      end
+
+      # Returns true if the pt is within these bounds.
+      def contains?(pt)
+         (pt.lat >=  min_lat and pt.lat <= max_lat and pt.lon >= min_lon and pt.lon <= max_lon)
+      end
+
+      # Adds an item to itself, expanding its min/max lat/lon as needed to
+      # contain the given item.  The item can be either another instance of
+      # Bounds or a Point.
+      def add(item)
+         if(item.respond_to?(:lat) and item.respond_to?(:lon))
+            @min_lat = item.lat if item.lat < @min_lat
+            @min_lon = item.lon if item.lon < @min_lon
+            @max_lat = item.lat if item.lat > @max_lat
+            @max_lon = item.lon if item.lon > @max_lon
+         else
+            @min_lat = item.min_lat if item.min_lat < @min_lat
+            @min_lon = item.min_lon if item.min_lon < @min_lon
+            @max_lat = item.max_lat if item.max_lat > @max_lat
+            @max_lon = item.max_lon if item.max_lon > @max_lon
+         end
+      end
+
+      # Returns the min_lat, min_lon, max_lat, and max_lon in a labeled string.
+      def to_s
+         "min_lat: #{min_lat} min_lon: #{min_lon} max_lat: #{max_lat} max_lon: #{max_lon}"
+      end
+
+   end
+end

lib/gpx/gpx.rb

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+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+   VERSION = "0.1"
+
+   # A common base class which provides a useful initializer method to many
+   # class in the GPX library.
+   class Base
+   include REXML
+
+      # This initializer can take a REXML::Element and scrape out any text
+      # elements with the names given in the "text_elements" array.  Each
+      # element found underneath "parent" with a name in "text_elements" causes
+      # an attribute to be initialized on the instance.  This means you don't
+      # have to pick out individual text elements in each initializer of each
+      # class (Route, TrackPoint, Track, etc).  Just pass an array of possible
+      # attributes to this method.
+      def instantiate_with_text_elements(parent, text_elements)
+         text_elements.each do |el|
+            unless parent.elements[el].nil?
+               val = parent.elements[el].text
+               code = <<-code
+                  attr_accessor #{ el }
+                  #{el}=#{val}
+               code
+               class_eval code
+            end
+         end
+
+      end
+
+   end
+end

lib/gpx/gpx_file.rb

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+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+   class GPXFile < Base
+      attr_reader :tracks, :routes, :waypoints, :bounds, :lowest_point, :highest_point, :distance, :duration, :average_speed
+
+
+      # This initializer can be used to create a new GPXFile from an existing
+      # file or to create a new GPXFile instance with no data (so that you can
+      # add tracks and points and write it out to a new file later).
+      # To read an existing GPX file, do this:
+      #         gpx_file = GPXFile.new(:gpx_file => 'mygpxfile.gpx')
+      #         puts "Speed: #{gpx_file.average_speed}"
+      #         puts "Duration: #{gpx_file.duration}"
+      #         puts "Bounds: #{gpx_file.bounds}"
+      #
+      # To create a new blank GPXFile instance:
+      #         gpx_file = GPXFile.new
+      # Note that you can pass in any instance variables to this form of the initializer, including Tracks or Segments:
+      #         some_track = get_track_from_csv('some_other_format.csv')
+      #         gpx_file = GPXFile.new(:tracks => [some_track])
+      #
+      def initialize(opts = {}) 
+         @duration = 0
+         if(opts[:gpx_file])
+            gpx_file = opts[:gpx_file]
+            case gpx_file
+            when String
+               gpx_file = File.open(gpx_file)
+            end
+            reset_meta_data
+            @xml = Document.new(gpx_file, :ignore_whitespace_nodes => :all)
+
+            bounds_element = (XPath.match(@xml, "/gpx/metadata/bounds").first rescue nil)
+            if bounds_element
+               @bounds.min_lat = bounds_element.attributes["min_lat"].to_f
+               @bounds.min_lon = bounds_element.attributes["min_lon"].to_f
+               @bounds.max_lat = bounds_element.attributes["max_lat"].to_f
+               @bounds.max_lon = bounds_element.attributes["max_lon"].to_f
+            else
+               get_bounds = true
+            end
+
+            @tracks = XPath.match(@xml, "/gpx/trk").collect do |trk| 
+               trk = Track.new(:element => trk, :gpx_file => self) 
+               update_meta_data(trk, get_bounds)
+               trk
+            end
+            @waypoints = XPath.match(@xml, "/gpx/wpt").collect { |wpt| Waypoint.new(:element => wpt, :gpx_file => self) }
+            @routes =    XPath.match(@xml, "/gpx/rte").collect { |rte| Route.new(:element => rte, :gpx_file => self) }
+
+            @tracks.delete_if { |t| t.empty? }
+
+            calculate_duration
+         else
+            reset_meta_data
+            opts.each { |attr_name, value| instance_variable_set("@#{attr_name.to_s}", value) }
+            unless(@tracks.nil? or @tracks.size.zero?)
+               @tracks.each { |trk| update_meta_data(trk) }
+               calculate_duration
+            end
+         end
+      end
+
+      # Returns the distance, in kilometers, meters, or miles, of all of the
+      # tracks and segments contained in this GPXFile.
+      def distance(opts = { :units => 'kilometers' })
+         case opts[:units]
+         when /kilometers/i
+            return @distance 
+         when /meters/i
+            return (@distance * 1000)
+         when /miles/i
+            return (@distance * 0.62)
+         end
+      end
+
+      # Returns the average speed, in km/hr, meters/hr, or miles/hr, of this
+      # GPXFile.  The calculation is based on the total distance divided by the
+      # total duration of the entire file.  
+      def average_speed(opts = { :units => 'kilometers' })
+         case opts[:units]
+         when /kilometers/i
+            return @distance / (@duration/3600.0)
+         when /meters/i
+            return (@distance * 1000) /  (@duration/3600.0)
+         when /miles/i
+            return (@distance * 0.62) / (@duration/3600.0)
+         end
+      end
+
+      # Crops any points falling within a rectangular area.  Identical to the
+      # delete_area method in every respect except that the points outside of
+      # the given area are deleted.  Note that this method automatically causes
+      # the meta data to be updated after deletion.
+      def crop(area)
+         reset_meta_data
+         keep_tracks = []
+         tracks.each do |trk| 
+            trk.crop(area) 
+            unless trk.empty?
+               update_meta_data(trk)
+               keep_tracks << trk 
+            end
+         end
+         @tracks = keep_tracks
+         routes.each { |rte| rte.crop(area) }
+         waypoints.each { |wpt| wpt.crop(area) }
+      end
+
+      # Deletes any points falling within a rectangular area.  The "area"
+      # parameter is usually an instance of the Bounds class.  Note that this
+      # method cascades into similarly named methods of subordinate classes
+      # (i.e. Track, Segment), which means, if you want the deletion to apply
+      # to all the data, you only call this one (and not the one in Track or
+      # Segment classes).  Note that this method automatically causes the meta
+      # data to be updated after deletion.
+      def delete_area(area)
+         reset_meta_data
+         keep_tracks = []
+         tracks.each do |trk| 
+            trk.delete_area(area) 
+            unless trk.empty?
+               update_meta_data(trk)
+               keep_tracks << trk 
+            end
+         end
+         @tracks =  keep_tracks
+         routes.each { |rte| rte.delete_area(area) }
+         waypoints.each { |wpt| wpt.delete_area(area) }
+      end
+
+      # Resets the meta data for this GPX file.  Meta data includes the bounds,
+      # the high and low points, and the distance.  
+      def reset_meta_data
+         @bounds = Bounds.new
+         @highest_point = nil
+         @lowest_point = nil
+         @distance = 0.0
+      end
+
+      # Updates the meta data for this GPX file.  Meta data includes the
+      # bounds, the high and low points, and the distance.  This is useful when
+      # you modify the GPX data (i.e. by adding or deleting points) and you
+      # want the meta data to accurately reflect the new data.
+      def update_meta_data(trk, get_bounds = true)
+         @lowest_point   = trk.lowest_point if(@lowest_point.nil? or trk.lowest_point.elevation < @lowest_point.elevation)
+         @highest_point  = trk.highest_point if(@highest_point.nil? or trk.highest_point.elevation > @highest_point.elevation)
+         @bounds.add(trk.bounds) if get_bounds
+         @distance += trk.distance
+      end
+
+      # Serialize the current GPXFile to a gpx file named <filename>.
+      # If the file does not exist, it is created.  If it does exist, it is overwritten.
+      def write(filename)
+
+         doc = Document.new
+         gpx_elem = Element.new('gpx')
+         doc.add(gpx_elem)
+         gpx_elem.attributes['xmlns:xsi'] = "http://www.w3.org/2001/XMLSchema-instance" 
+         gpx_elem.attributes['xmlns'] = "http://www.topografix.com/GPX/1/1" 
+         gpx_elem.attributes['version'] = "1.1" 
+         gpx_elem.attributes['creator'] = "GPX RubyGem 0.1 Copyright 2006 Doug Fales -- http://walkingboss.com" 
+         gpx_elem.attributes['xsi:schemaLocation'] = "http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"
+
+         meta_data_elem = Element.new('metadata')
+         name_elem = Element.new('name')
+         name_elem.text = File.basename(filename)
+         meta_data_elem.elements << name_elem
+
+         time_elem = Element.new('time')
+         time_elem.text = Time.now.xmlschema
+         meta_data_elem.elements << time_elem
+
+         meta_data_elem.elements << bounds.to_xml
+
+         gpx_elem.elements << meta_data_elem
+
+         tracks.each    { |t|   gpx_elem.add_element t.to_xml } unless tracks.nil?
+         waypoints.each { |w| gpx_elem.add_element w.to_xml } unless waypoints.nil?
+         routes.each    { |r| gpx_elem.add_element r.to_xml } unless routes.nil?
+
+         File.open(filename, 'w') { |f| doc.write(f) }
+      end
+
+      private 
+
+      # Calculates and sets the duration attribute by subtracting the time on
+      # the very first point from the time on the very last point.
+      def calculate_duration
+         @duration = 0
+         if(@tracks.nil? or @tracks.size.zero? or @tracks[0].segments.nil? or @tracks[0].segments.size.zero?)
+            return @duration
+         end
+         @duration = (@tracks[-1].segments[-1].points[-1].time - @tracks.first.segments.first.points.first.time)
+      rescue
+         @duration = 0
+      end
+
+
+   end
+end

lib/gpx/magellan_track_log.rb

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+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+
+   # This class will parse the lat/lon and time data from a Magellan track log,
+   # which is a NMEA formatted CSV list of points.
+
+   class MagellanTrackLog
+      #PMGNTRK
+      # This message is to be used to transmit Track information (basically a list of previous position fixes) 
+      # which is often displayed on the plotter or map screen of the unit.  The first field in this message 
+      # is the Latitude, followed by N or S.  The next field is the Longitude followed by E or W.  The next 
+      # field is the altitude followed by “F” for feet or “M” for meters.  The next field is 
+      # the UTC time of the fix.  The next field consists of a status letter of “A” to indicated that 
+      # the data is valid, or “V” to indicate that the data is not valid.  The last character field is 
+      # the name of the track, for those units that support named tracks.  The last field contains the UTC date 
+      # of the fix.  Note that this field is (and its preceding comma) is only produced by the unit when the 
+      # command PMGNCMD,TRACK,2 is given.  It is not present when a simple command of PMGNCMD,TRACK is issued.
+
+      #NOTE: The Latitude and Longitude Fields are shown as having two decimal
+      # places. As many additional decimal places may be added as long as the total
+      # length of the message does not exceed 82 bytes.
+
+      # $PMGNTRK,llll.ll,a,yyyyy.yy,a,xxxxx,a,hhmmss.ss,A,c----c,ddmmyy*hh<CR><LF>
+      require 'csv' 
+
+      LAT       = 1
+      LAT_HEMI  = 2
+      LON       = 3
+      LON_HEMI  = 4
+      ELE       = 5 
+      ELE_UNITS = 6
+      TIME      = 7
+      INVALID_FLAG = 8
+      DATE      = 10
+
+      FEET_TO_METERS = 0.3048
+
+      class << self
+
+         # Takes the name of a magellan file, converts the contents to GPX, and
+         # writes the result to gpx_filename.
+         def  convert_to_gpx(magellan_filename, gpx_filename)
+
+            segment = Segment.new
+
+            CSV.open(magellan_filename, "r") do |row| 
+               next if(row.size < 10 or row[INVALID_FLAG] == 'V')
+
+               lat_deg  = row[LAT][0..1]
+               lat_min  = row[LAT][2...-1]
+               lat_hemi = row[LAT_HEMI]
+
+               lat = lat_deg.to_f + (lat_min.to_f / 60.0)
+               lat = (-lat) if(lat_hemi == 'S')
+
+               lon_deg      = row[LON][0..2]
+               lon_min  = row[LON][3..-1]
+               lon_hemi = row[LON_HEMI]
+
+               lon = lon_deg.to_f + (lon_min.to_f / 60.0)
+               lon = (-lon) if(lon_hemi == 'W')
+
+
+               ele = row[ELE]
+               ele_units = row[ELE_UNITS]
+               ele = ele.to_f
+               if(ele_units == 'F')
+                  ele *= FEET_TO_METERS
+               end
+
+               hrs  = row[TIME][0..1].to_i
+               mins = row[TIME][2..3].to_i
+               secs = row[TIME][4..5].to_i
+               day  = row[DATE][0..1].to_i
+               mon  = row[DATE][2..3].to_i
+               yr   = 2000 + row[DATE][4..5].to_i
+
+               time = Time.gm(yr, mon, day, hrs, mins, secs)
+
+               #must create point
+               pt = TrackPoint.new(:lat => lat, :lon => lon, :time => time, :elevation => ele)
+               segment.append_point(pt)
+
+            end 
+
+            trk = Track.new
+            trk.append_segment(segment)
+            gpx_file = GPXFile.new(:tracks => [trk])
+            gpx_file.write(gpx_filename)
+
+         end
+
+         # Tests to see if the given file is a magellan NMEA track log.
+         def is_magellan_file?(filename)
+            i = 0
+            File.open(filename, "r") do |f|
+               f.each do |line|
+                  i +=  1
+                  if line =~ /^\$PMGNTRK/
+                     return true 
+                  elsif line =~ /<\?xml/
+                     return false
+                  elsif(i > 10)
+                     return false 
+                  end
+               end
+            end
+            return false
+         end
+      end
+
+   end
+end

lib/gpx/point.rb

@@ -0,0 +1,103 @@
+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+include Math
+module GPX
+   # The base class for all points.  Trackpoint and Waypoint both descend from this base class.
+   class Point < Base
+      D_TO_R = PI/180.0;
+      attr_accessor :lat, :lon, :time, :elevation
+
+      # When you need to manipulate individual points, you can create a Point
+      # object with a latitude, a longitude, an elevation, and a time.  In
+      # addition, you can pass a REXML element to this initializer, and the
+      # relevant info will be parsed out.
+      def initialize(opts = {:lat => 0.0, :lon => 0.0, :elevation => 0.0, :time => Time.now } )
+         if (opts[:element]) 
+            elem = opts[:element]
+            @lat, @lon = elem.attributes["lat"].to_f, elem.attributes["lon"].to_f
+            @latr, @lonr = (D_TO_R * @lat), (D_TO_R * @lon)
+            #'-'? yyyy '-' mm '-' dd 'T' hh ':' mm ':' ss ('.' s+)? (zzzzzz)?
+            @time = (Time.xmlschema(elem.elements["time"].text) rescue nil)
+            @elevation = elem.elements["ele"].text.to_f if elem.elements["ele"]
+         else
+            @lat = opts[:lat]
+            @lon = opts[:lon]
+            @elevation = opts[:elevation]
+            @time = opts[:time]
+         end
+
+      end
+
+
+      # Returns the latitude and longitude (in that order), separated by the
+      # given delimeter.  This is useful for passing a point into another API
+      # (i.e. the Google Maps javascript API).
+      def lat_lon(delim = ', ')
+        "#{lat}#{delim}#{lon}"
+      end
+
+      # Returns the longitude and latitude (in that order), separated by the
+      # given delimeter.  This is useful for passing a point into another API
+      # (i.e. the Google Maps javascript API).
+      def lon_lat(delim = ', ')
+        "#{lon}#{delim}#{lat}"
+      end
+
+      # Latitude in radians.
+      def latr
+         @latr ||= (@lat * D_TO_R)
+      end
+
+      # Longitude in radians.
+      def lonr
+         @lonr ||= (@lon * D_TO_R)
+      end
+
+      # Set the latitude (in degrees).
+      def lat=(latitude)
+         @latr = (latitude * D_TO_R)
+         @lat = latitude
+      end
+
+      # Set the longitude (in degrees).
+      def lon=(longitude)
+         @lonr = (longitude * D_TO_R)
+         @lon = longitude
+      end
+
+      # Convert this point to a REXML::Element.
+      def to_xml(elem_name = 'trkpt')
+         pt = Element.new('trkpt')
+         pt.attributes['lat'] = lat
+         pt.attributes['lon'] = lon
+         time_elem = Element.new('time')
+         time_elem.text = time.xmlschema
+         pt.elements << time_elem
+         elev = Element.new('ele')
+         elev.text = elevation
+         pt.elements << elev
+         pt
+      end
+
+   end
+end

lib/gpx/route.rb

@@ -0,0 +1,65 @@
+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+
+   # A Route in GPX is very similar to a Track, but it is created by a user
+   # from a series of Waypoints, whereas a Track is created by the GPS device
+   # automatically logging your progress at regular intervals.  
+   class Route < Base
+
+      attr_reader :points, :name, :gpx_file
+
+      # Initialize a Route from a REXML::Element.
+      def initialize(opts = {})
+         rte_element = opts[:element]
+         @gpx_file = opts[:gpx_file]
+         @name = rte_element.elements["child::name"].text
+         @points = []
+         XPath.each(rte_element, "child::rtept") do |point|
+            @points << Point.new(:element => point)
+         end
+
+      end
+
+      # Delete points outside of a given area.
+      def crop(area)
+         points.delete_if{ |pt| not area.contains? pt }
+      end
+
+      # Delete points within the given area.
+      def delete_area(area)
+         points.delete_if{ |pt| area.contains? pt }
+      end
+
+      # Convert this Route to a REXML::Element.
+      def to_xml
+         rte = Element.new('rte')
+         name_elem = Element.new('name')
+         name_elem.text = name
+         rte.elements << name_elem
+         points.each { |rte_pt| rte.elements << rte_pt.to_xml('rtept') }
+         rte
+      end
+
+   end
+end

lib/gpx/segment.rb

@@ -0,0 +1,217 @@
+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+
+   # A segment is the basic container in a GPX file.  A Segment contains points
+   # (in this lib, they're called TrackPoints).  A Track contains Segments.  An
+   # instance of Segment knows its highest point, lowest point, earliest and
+   # latest points, distance, and bounds.
+   class Segment < Base
+
+      attr_reader :earliest_point, :latest_point, :bounds, :highest_point, :lowest_point, :distance
+      attr_accessor :points, :track 
+
+      # If a REXML::Element object is passed-in, this will initialize a new
+      # Segment based on its contents.  Otherwise, a blank Segment is created.
+      def initialize(opts = {})
+         @track = opts[:track]
+         @points = []
+         @earliest_point = nil
+         @latest_point = nil
+         @highest_point = nil
+         @lowest_point = nil
+         @distance = 0.0
+         @bounds = Bounds.new
+         if(opts[:element])
+            segment_element = opts[:element]
+            last_pt = nil
+            unless segment_element.is_a?(Text)
+               XPath.each(segment_element, "child::trkpt") do |trkpt| 
+                  pt = TrackPoint.new(:element => trkpt, :segment => self)  
+                  @earliest_point = pt if(@earliest_point.nil? or pt.time < @earliest_point.time)
+                  @latest_point   = pt if(@latest_point.nil? or pt.time > @latest_point.time)
+                  unless pt.elevation.nil?
+                     @lowest_point   = pt if(@lowest_point.nil? or pt.elevation < @lowest_point.elevation)
+                     @highest_point  = pt if(@highest_point.nil? or pt.elevation > @highest_point.elevation)
+                  end
+                  @bounds.min_lat = pt.lat if pt.lat < @bounds.min_lat
+                  @bounds.min_lon = pt.lon if pt.lon < @bounds.min_lon
+                  @bounds.max_lat = pt.lat if pt.lat > @bounds.max_lat
+                  @bounds.max_lon = pt.lon if pt.lon > @bounds.max_lon
+
+                  @distance += haversine_distance(last_pt, pt) unless last_pt.nil?
+
+                  @points << pt
+                  last_pt  = pt
+               end
+            end
+         end
+      end
+
+      # Tack on a point to this Segment.  All meta-data will be updated.
+      def append_point(pt)
+         last_pt = @points[-1]
+         @earliest_point = pt if(@earliest_point.nil? or pt.time < @earliest_point.time)
+         @latest_point   = pt if(@latest_point.nil? or pt.time > @latest_point.time)
+         @lowest_point   = pt if(@lowest_point.nil? or pt.elevation < @lowest_point.elevation)
+         @highest_point  = pt if(@highest_point.nil? or pt.elevation > @highest_point.elevation)
+         @bounds.min_lat = pt.lat if pt.lat < @bounds.min_lat
+         @bounds.min_lon = pt.lon if pt.lon < @bounds.min_lon
+         @bounds.max_lat = pt.lat if pt.lat > @bounds.max_lat
+         @bounds.max_lon = pt.lon if pt.lon > @bounds.max_lon
+         @distance += haversine_distance(last_pt, pt) unless last_pt.nil?
+         @points << pt
+      end
+
+      # Returns true if the given time is within this Segment.
+      def contains_time?(time)
+         (time >= @earliest_point.time and time <= @latest_point.time)
+      end
+
+      # Finds the closest point in time to the passed-in time argument.  Useful
+      # for matching up time-based objects (photos, video, etc) with a
+      # geographic location.
+      def closest_point(time)
+         find_closest(points, time)
+      end
+
+      # Deletes all points within this Segment that lie outside of the given
+      # area (which should be a Bounds object).
+      def crop(area)
+         delete_if { |pt| not area.contains?(pt) }
+      end
+
+      # Deletes all points in this Segment that lie within the given area.
+      def delete_area(area)
+         delete_if{ |pt| area.contains?(pt) }
+      end
+
+      # A handy method that deletes points based on a block that is passed in.
+      # If the passed-in block returns true when given a point, then that point
+      # is deleted.  For example:
+      #         delete_if{ |pt| area.contains?(pt) }
+      def delete_if
+         reset_meta_data
+         keep_points = []
+         last_pt = nil
+         points.each do |pt| 
+            unless yield(pt)
+               keep_points << pt
+               update_meta_data(pt, last_pt)
+               last_pt = pt
+            end
+         end
+         @points = keep_points
+      end
+
+      # Returns true if this Segment has no points.
+      def empty?
+         (points.nil? or (points.size == 0))
+      end
+
+      # Converts this Segment to a REXML::Element object.
+      def to_xml
+         seg = Element.new('trkseg')
+         points.each { |pt| seg.elements << pt.to_xml }
+         seg
+      end
+
+      # Prints out a nice summary of this Segment.
+      def to_s
+         result = "Track Segment\n"
+         result << "\tSize: #{points.size} points\n"
+         result << "\tDistance: #{distance} km\n"
+         result << "\tEarliest Point: #{earliest_point.time.to_s} \n"
+         result << "\tLatest Point: #{latest_point.time.to_s} \n"
+         result << "\tLowest Point: #{lowest_point.elevation} \n"
+         result << "\tHighest Point: #{highest_point.elevation}\n "
+         result << "\tBounds: #{bounds.to_s}"
+         result
+      end
+
+      protected
+      def find_closest(pts, time)
+         return pts.first if pts.size == 1
+         midpoint = pts.size/2
+         if pts.size == 2
+            diff_1 = pts[0].time - time
+            diff_2 = pts[1].time - time
+            return (diff_1 < diff_2 ? pts[0] : pts[1])
+         end
+         if time >= pts[midpoint].time and time <= pts[midpoint+1].time
+
+            return pts[midpoint]
+
+         elsif(time <= pts[midpoint].time)
+            return find_closest(pts[0..midpoint], time)
+         else
+            return find_closest(pts[(midpoint+1)..-1], time)
+         end
+      end
+
+      RADIUS = 6371; # earth's mean radius in km
+
+      # Calculate the Haversine distance between two points. This is the method
+      # the library uses to calculate the cumulative distance of GPX files. 
+      def haversine_distance(p1, p2)
+         d_lat = p2.latr - p1.latr;
+         d_lon = p2.lonr - p1.lonr;
+         a = Math.sin(d_lat/2) * Math.sin(d_lat/2) + Math.cos(p1.latr) * Math.cos(p2.latr) * Math.sin(d_lon/2) * Math.sin(d_lon/2);
+         c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
+         d = RADIUS * c;
+         return d;
+      end
+
+      # Calculate the plain Pythagorean difference between two points.  Not currently used.
+      def pythagorean_distance(p1, p2)
+         Math.sqrt((p2.latr - p1.latr)**2 + (p2.lonr - p1.lonr)**2)
+      end
+
+      # Calculates the distance between two points using the Law of Cosines formula.  Not currently used.
+      def law_of_cosines_distance(p1, p2)
+         (Math.acos(Math.sin(p1.latr)*Math.sin(p2.latr) + Math.cos(p1.latr)*Math.cos(p2.latr)*Math.cos(p2.lonr-p1.lonr)) * RADIUS)
+      end
+
+      def reset_meta_data
+         @earliest_point = nil
+         @latest_point = nil
+         @highest_point = nil
+         @lowest_point = nil
+         @distance = 0.0
+         @bounds = Bounds.new
+      end
+
+      def update_meta_data(pt, last_pt)
+         @earliest_point = pt if(@earliest_point.nil? or pt.time < @earliest_point.time)
+         @latest_point   = pt if(@latest_point.nil? or pt.time > @latest_point.time)
+         unless pt.elevation.nil?
+            @lowest_point   = pt if(@lowest_point.nil? or pt.elevation < @lowest_point.elevation)
+            @highest_point  = pt if(@highest_point.nil? or pt.elevation > @highest_point.elevation)
+         end
+         @bounds.add(pt)
+         @distance += haversine_distance(last_pt, pt) unless last_pt.nil?
+      end
+
+   end
+
+end

lib/gpx/track.rb

@@ -0,0 +1,149 @@
+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+
+   # In GPX, a single Track can hold multiple Segments, each of which hold
+   # multiple points (in this library, those points are instances of
+   # TrackPoint).  Each instance of this class has its own meta-data, including
+   # low point, high point, and distance.  Of course, each track references an
+   # array of the segments that copmrise it, but additionally each track holds
+   # a reference to all of its points as one big array called "points".
+   class Track < Base
+      attr_reader :points, :bounds, :lowest_point, :highest_point, :distance
+      attr_accessor :segments, :name, :gpx_file
+
+      # Initialize a track from a REXML::Element, or, if no :element option is
+      # passed, initialize a blank Track object.
+      def initialize(opts = {})
+         @gpx_file = opts[:gpx_file]
+         @segments = []
+         @points = []
+         reset_meta_data
+         if(opts[:element]) 
+            trk_element = opts[:element]
+            @name = (trk_element.elements["child::name"].text rescue "")
+            XPath.each(trk_element, "child::trkseg") do |seg_element|
+               seg = Segment.new(:element => seg_element, :track => self)
+               update_meta_data(seg)
+               @segments << seg
+               @points.concat(seg.points) unless seg.nil?
+            end
+         end
+      end
+       
+      # Append a segment to this track, updating its meta data along the way.
+      def append_segment(seg)
+         update_meta_data(seg)
+         @segments << seg
+         @points.concat(seg.points) unless seg.nil?
+      end
+
+      # Returns true if the given time occurs within any of the segments of this track.
+      def contains_time?(time)
+         segments.each do |seg|
+            return true if seg.contains_time?(time)
+         end
+         return false
+      end
+
+      # Finds the closest point (to "time") within this track.  Useful for
+      # correlating things like pictures, video, and other events, if you are
+      # working with a timestamp.
+      def closest_point(time)
+         segment = segments.find { |s| s.contains_time?(time) }
+         segment.closest_point(time)
+      end
+
+      # Removes all points outside of a given area and updates the meta data.
+      # The "area" paremeter is usually a Bounds object.
+      def crop(area)
+         reset_meta_data
+         segments.each do |seg| 
+            seg.crop(area) 
+            update_meta_data(seg) unless seg.empty?
+         end
+         segments.delete_if { |seg| seg.empty? }
+      end
+
+      # Deletes all points within a given area and updates the meta data.  
+      def delete_area(area)
+         reset_meta_data
+         segments.each do |seg| 
+            seg.delete_area(area) 
+            update_meta_data(seg) unless seg.empty?
+         end
+         segments.delete_if { |seg| seg.empty? }
+      end
+
+      # Returns true if this track has no points in it.  This should return
+      # true even when the track has empty segments.
+      def empty?
+         (points.nil? or points.size.zero?)
+      end
+
+      # Creates a new REXML::Element from the contents of this instance.
+      def to_xml
+         trk= Element.new('trk')
+         name_elem = Element.new('name')
+         name_elem.text = name
+         trk.elements << name_elem
+         segments.each do |seg|
+            trk.elements << seg.to_xml
+         end
+         trk
+      end
+
+      # Prints out a friendly summary of this track (sans points).  Useful for
+      # debugging and sanity checks.
+      def to_s
+         result = "Track \n"
+         result << "\tName: #{name}\n"
+         result << "\tSize: #{points.size} points\n"
+         result << "\tSegments: #{segments.size} \n"
+         result << "\tDistance: #{distance} km\n"
+         result << "\tLowest Point: #{lowest_point.elevation} \n"
+         result << "\tHighest Point: #{highest_point.elevation}\n "
+         result << "\tBounds: #{bounds.to_s}"
+         result
+      end
+
+      protected
+
+      def update_meta_data(seg)
+         @lowest_point   = seg.lowest_point if(@lowest_point.nil? or seg.lowest_point.elevation < @lowest_point.elevation)
+         @highest_point  = seg.highest_point if(@highest_point.nil? or seg.highest_point.elevation > @highest_point.elevation)
+         @bounds.add(seg.bounds)
+         @distance += seg.distance
+         @points.concat(seg.points)
+      end
+
+      def reset_meta_data
+         @bounds = Bounds.new
+         @highest_point = nil
+         @lowest_point = nil
+         @distance = 0.0
+         @points = []
+      end
+
+   end
+end

lib/gpx/trackpoint.rb

@@ -0,0 +1,35 @@
+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+module GPX
+   # Basically the same as a point, the TrackPoint class is supposed to
+   # represent the points that are children of Segment elements.  So, the only
+   # real difference is that TrackPoints hold a reference to their parent
+   # Segments.
+   class TrackPoint < Point
+      attr_accessor :segment
+      def initialize(opts = {})
+         super(opts)
+         @segment = opts[:segment]
+      end
+   end
+end

lib/gpx/waypoint.rb

@@ -0,0 +1,73 @@
+#--
+# Copyright (c) 2006  Doug Fales 
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#++
+
+module GPX
+
+   # This class supports the concept of a waypoint.  Beware that this class has
+   # not seen much use yet, since WalkingBoss does not use waypoints right now. 
+   class Waypoint < Point
+
+      SUB_ELEMENTS = %q{ magvar geoidheight name cmt desc src link sym type fix sat hdop vdop pdop ageofdgpsdata dgpsid extensions } 
+
+      attr_reader :gpx_file
+
+      # Not implemented
+      def crop(area)
+      end
+
+      # Not implemented
+      def delete_area(area)
+      end
+
+      # Initializes a waypoint from a REXML::Element.
+      def initialize(opts = {})
+         wpt_elem = opts[:element]
+         super(:element => wpt_elem)
+         instantiate_with_text_elements(wpt_elem, SUB_ELEMENTS)
+         @gpx_file = opts[:gpx_file]
+      end
+
+      # Converts a waypoint to a REXML::Element.
+      def to_xml
+         wpt = Element.new('wpt')
+         wpt.attributes['lat'] = lat
+         wpt.attributes['lon'] = lon
+         if self.respond_to? :name
+            name_elem = Element.new('name')
+            name_elem.text = self.name 
+            wpt.elements << name_elem
+         end
+         if self.respond_to? :sym
+            sym_elem = Element.new('sym')
+            sym_elem.text = self.sym
+            wpt.elements << sym_elem
+         end
+         if self.respond_to? :ele
+            elev_elem = Element.new('ele')
+            elev_elem.text = self.ele
+            wpt.elements << elev_elem
+         end
+         wpt
+      end
+   end
+end

tests/gpx_files/magellan_track.log

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tests/gpx_files/one_segment.gpx

@@ -0,0 +1,770 @@
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+	<metadata>
+		<name><![CDATA[rabbit_valley.gpx]]></name>
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+	</metadata>
+	<extensions/>
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+		<name><![CDATA[RABBIT U]]></name>
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+	</trk>
+</gpx>

tests/gpx_files/one_track.gpx

@@ -0,0 +1,756 @@
+<?xml version="1.0" encoding="UTF-8"?>
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+	<metadata>
+		<name><![CDATA[active_log.gpx]]></name>
+		<time>2006-04-08T16:44:28Z</time>
+		<bounds min_lat="38.681488" min_lon="-109.606948" max_lat="38.791759" max_lon="-109.447045"/>
+	</metadata>
+	<extensions/>
+	<trk>
+		<name><![CDATA[ACTIVE LOG]]></name>
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tests/gpx_files/routes.gpx

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><gpx xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="Link2GPS - 2.0.2 - http://www.hiketech.com" xsi:schemaLocation="ttp://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"><metadata><name><![CDATA[routes.gpx]]></name><time>2006-01-02T08:55:34Z</time><bounds min_lat="39.989739" min_lon="-105.295285" max_lat="39.999840" max_lon="-105.214696"/></metadata><extensions/><rte><name><![CDATA[GRG-CA-TO]]></name><rtept lat="39.997298" lon="-105.292674"><name><![CDATA[GRG-CA]]></name><sym>Waypoint</sym><ele>1766.535</ele></rtept><rtept lat="39.995700" lon="-105.292805"><name><![CDATA[AMPTHT]]></name><sym>Waypoint</sym><ele>1854.735</ele></rtept><rtept lat="39.989739" lon="-105.295285"><name><![CDATA[TO]]></name><sym>Waypoint</sym><ele>2163.556</ele></rtept></rte><rte><name><![CDATA[SBDR-SBDR]]></name><rtept lat="39.999840" lon="-105.214696"><name><![CDATA[SBDR]]></name><sym>Waypoint</sym><ele>1612.965</ele></rtept></rte></gpx>

tests/gpx_files/waypoints.gpx

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><gpx xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="Link2GPS - 2.0.2 - http://www.hiketech.com" xsi:schemaLocation="ttp://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"><metadata><name><![CDATA[waypoints.gpx]]></name><time>2006-01-02T08:55:21Z</time><bounds min_lat="25.061783" min_lon="-111.946110" max_lat="50.982883" max_lon="121.640267"/></metadata><extensions/><wpt lat="40.035557" lon="-105.248268"><name><![CDATA[001]]></name><sym>Waypoint</sym><ele>1639.161</ele></wpt><wpt lat="39.993070" lon="-105.296588"><name><![CDATA[002]]></name><sym>Waypoint</sym><ele>1955.192</ele></wpt><wpt lat="39.990151" lon="-105.295680"><name><![CDATA[003]]></name><sym>Waypoint</sym><ele>2129.91</ele></wpt><wpt lat="39.990157" lon="-105.295686"><name><![CDATA[004]]></name><sym>Waypoint</sym><ele>2136.399</ele></wpt><wpt lat="39.990134" lon="-105.295251"><name><![CDATA[005]]></name><sym>Waypoint</sym><ele>2174.612</ele></wpt><wpt lat="39.990116" lon="-105.295147"><name><![CDATA[006]]></name><sym>Waypoint</sym><ele>2156.106</ele></wpt><wpt lat="39.990099" lon="-105.295207"><name><![CDATA[007]]></name><sym>Waypoint</sym><ele>2155.145</ele></wpt><wpt lat="39.990067" lon="-105.295185"><name><![CDATA[008]]></name><sym>Waypoint</sym><ele>2152.021</ele></wpt><wpt lat="39.995700" lon="-105.292805"><name><![CDATA[AMPTHT]]></name><sym>Waypoint</sym><ele>1854.735</ele></wpt><wpt lat="38.855550" lon="-94.799017"><name><![CDATA[GARMIN]]></name><sym>Waypoint</sym><ele>325.0491</ele></wpt><wpt lat="39.997298" lon="-105.292674"><name><![CDATA[GRG-CA]]></name><sym>Waypoint</sym><ele>1766.535</ele></wpt><wpt lat="50.982883" lon="-1.463900"><name><![CDATA[GRMEUR]]></name><sym>Waypoint</sym><ele>35.93469</ele></wpt><wpt lat="33.330190" lon="-111.946110"><name><![CDATA[GRMPHX]]></name><sym>Waypoint</sym><ele>361.0981</ele></wpt><wpt lat="25.061783" lon="121.640267"><name><![CDATA[GRMTWN]]></name><sym>Waypoint</sym><ele>38.09766</ele></wpt><wpt lat="39.999840" lon="-105.214696"><name><![CDATA[SBDR]]></name><sym>Waypoint</sym><ele>1612.965</ele></wpt><wpt lat="39.989739" lon="-105.295285"><name><![CDATA[TO]]></name><sym>Waypoint</sym><ele>2163.556</ele></wpt><wpt lat="40.035301" lon="-105.254443"><name><![CDATA[VICS]]></name><sym>Waypoint</sym><ele>1535.34</ele></wpt></gpx>

tests/magellan_test.rb

@@ -0,0 +1,18 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../lib/gpx'
+
+class TestMagellanTrackLog < Test::Unit::TestCase
+   MAGELLAN_TRACK_LOG = File.join(File.dirname(__FILE__), "gpx_files/magellan_track.log")
+   GPX_FILE = File.join(File.dirname(__FILE__), "gpx_files/one_segment.gpx")
+
+   def test_convert
+      GPX::MagellanTrackLog.convert_to_gpx(MAGELLAN_TRACK_LOG, "/tmp/gpx_from_magellan.gpx")
+      @gpx_file = GPX::GPXFile.new(:gpx_file => "/tmp/gpx_from_magellan.gpx")
+   end
+
+   def test_file_type
+      assert(GPX::MagellanTrackLog::is_magellan_file?(MAGELLAN_TRACK_LOG))
+      assert(!GPX::MagellanTrackLog::is_magellan_file?(GPX_FILE))
+   end
+
+end

tests/segment_test.rb

@@ -0,0 +1,57 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../lib/gpx'
+
+class TestSegment < Test::Unit::TestCase
+   ONE_SEGMENT = File.join(File.dirname(__FILE__), "gpx_files/one_segment.gpx")
+
+   def setup
+      @gpx_file = GPX::GPXFile.new(:gpx_file => ONE_SEGMENT)
+      @segment = @gpx_file.tracks.first.segments.first
+   end
+
+   def test_segment_read
+      assert_equal(189, @segment.points.size)
+      assert_equal("Fri Apr 07 18:12:05 UTC 2006", @segment.earliest_point.time.to_s)
+      assert_equal("Fri Apr 07 19:26:31 UTC 2006", @segment.latest_point.time.to_s)
+      assert_equal(1334.447, @segment.lowest_point.elevation)
+      assert_equal(1480.087, @segment.highest_point.elevation)
+      assert_equal("6.98803359528853", @segment.distance.to_s) 
+   end
+
+   def test_segment_crop
+      crop_rectangle = GPX::Bounds.new( :min_lat=> 39.173000,
+                                   :min_lon=> -109.010000,
+                                   :max_lat=> 39.188000,
+                                   :max_lon=> -108.999000)
+      @segment.crop(crop_rectangle)
+
+      assert_equal(106, @segment.points.size) 
+      assert_equal("4.11422061733046", @segment.distance.to_s) 
+      assert_equal("Fri Apr 07 18:37:21 UTC 2006", @segment.earliest_point.time.to_s)
+      assert_equal("Fri Apr 07 19:22:32 UTC 2006",  @segment.latest_point.time.to_s)
+      assert_equal(1407.027, @segment.lowest_point.elevation)
+      assert_equal(1480.087, @segment.highest_point.elevation)
+      assert_equal(39.173834, @segment.bounds.min_lat)
+      assert_equal(-109.009995, @segment.bounds.min_lon)
+      assert_equal(39.187868,   @segment.bounds.max_lat)
+      assert_equal(-108.999546, @segment.bounds.max_lon)
+   end
+
+   def test_segment_delete
+      delete_rectangle = GPX::Bounds.new( :min_lat=> 39.173000,
+                                   :min_lon=> -109.010000,
+                                   :max_lat=> 39.188000,
+                                   :max_lon=> -108.999000)
+      @segment.delete_area(delete_rectangle)
+      assert_equal(83, @segment.points.size) 
+      assert_equal("3.35967118153605", @segment.distance.to_s) 
+      assert_equal("Fri Apr 07 18:12:05 UTC 2006", @segment.earliest_point.time.to_s)
+      assert_equal("Fri Apr 07 19:26:31 UTC 2006",  @segment.latest_point.time.to_s)
+      assert_equal(1334.447, @segment.lowest_point.elevation)
+      assert_equal(1428.176, @segment.highest_point.elevation)
+      assert_equal(39.180572, @segment.bounds.min_lat)
+      assert_equal(-109.016604, @segment.bounds.min_lon)
+      assert_equal(39.188747,   @segment.bounds.max_lat)
+      assert_equal(-109.007978, @segment.bounds.max_lon)
+   end
+end

tests/track_file_test.rb

@@ -0,0 +1,75 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../lib/gpx'
+
+class TestTrackFile < Test::Unit::TestCase
+   TRACK_FILE = File.join(File.dirname(__FILE__), "gpx_files/tracks.gpx")
+   OTHER_TRACK_FILE = File.join(File.dirname(__FILE__), "gpx_files/arches.gpx")
+
+   def setup
+      @track_file = GPX::GPXFile.new(:gpx_file => TRACK_FILE)
+      @other_track_file = GPX::GPXFile.new(:gpx_file => OTHER_TRACK_FILE)
+   end
+
+   def test_track_read
+      assert_equal(3, @track_file.tracks.size)
+      assert_equal("First Track",  @track_file.tracks[0].name)
+      assert_equal("Second Track", @track_file.tracks[1].name)
+      assert_equal("Third Track",  @track_file.tracks[2].name)
+   end
+
+   def test_track_segment_and_point_counts
+      # One segment with 398 points...
+      assert_equal(1, @track_file.tracks[0].segments.size)
+      assert_equal(389, @track_file.tracks[0].segments.first.points.size)
+
+      # One segment with 299 points...
+      assert_equal(1, @track_file.tracks[1].segments.size)
+      assert_equal(299, @track_file.tracks[1].segments.first.points.size)
+
+      # Many segments of many different sizes
+      segment_sizes = %w{ 2 2 5 4 2 1 197 31 54 1 15 54 19 26 109 18 9 2 8 3 10 23 21 11 25 32 66 21 2 3 3 4 6 4 4 4 3 3 6 6 27 13 2 }
+      assert_equal(43, @track_file.tracks[2].segments.size)
+      @track_file.tracks[2].segments.each_with_index do |seg, i|
+         assert_equal(segment_sizes[i].to_i, seg.points.size)
+      end
+      last_segment = @track_file.tracks[2].segments.last
+      assert_equal(1680.041, last_segment.points.last.elevation)
+
+
+      second_to_last_segment = @track_file.tracks[2].segments[-2]
+      assert_equal("2006-01-02T00:00:51Z", second_to_last_segment.points.last.time.strftime("%Y-%m-%dT%H:%M:%SZ"))
+      assert_equal(39.998045, second_to_last_segment.points.last.lat)
+      assert_equal(-105.292368, second_to_last_segment.points.last.lon)
+   end
+
+   def test_find_nearest_point_by_time
+      time = Time.parse("2005-12-31T22:02:01Z")
+      pt = @track_file.tracks[0].closest_point(time)
+      #puts "pt: #{pt.lat_lon}"
+
+   end
+
+   def test_find_distance
+      #puts "Distance: #{@other_track_file.distance(:units => 'miles')} miles"
+      #puts "Distance: #{@track_file.distance(:units => 'miles')} miles"
+   end
+   def test_high_low_elevation
+      #puts "Lowest: #{@track_file.lowest_point.elevation} m"
+      #puts "Highest: #{@track_file.highest_point.elevation} m"
+   end
+
+   def test_duration
+      #puts "Duration 1: #{@other_track_file.duration} "
+      #puts "Duration 2: #{@track_file.duration} "
+   end
+
+   def test_average_speed
+      #puts "Speed 1: #{@other_track_file.average_speed} "
+      #puts "Speed 2: #{@track_file.average_speed} "
+   end
+
+   def test_write
+      @other_track_file.write("myoutput.gpx")
+   end
+
+end

tests/track_test.rb

@@ -0,0 +1,65 @@
+require 'test/unit'
+require File.dirname(__FILE__) + '/../lib/gpx'
+
+class TestTrack < Test::Unit::TestCase
+   ONE_TRACK = File.join(File.dirname(__FILE__), "gpx_files/one_track.gpx")
+
+   def setup
+      @gpx_file = GPX::GPXFile.new(:gpx_file => ONE_TRACK)
+      @track = @gpx_file.tracks.first
+   end
+
+   def test_track_read
+      assert_equal("ACTIVE LOG", @track.name)
+      assert_equal( 364, @track.points.size) 
+      assert_equal(8, @track.segments.size)
+      assert_equal("3.07249668492626", @track.distance.to_s) 
+      assert_equal(1267.155, @track.lowest_point.elevation)
+      assert_equal(1594.003, @track.highest_point.elevation)
+      assert_equal(38.681488, @track.bounds.min_lat) 
+      assert_equal(-109.606948, @track.bounds.min_lon) 
+      assert_equal(38.791759, @track.bounds.max_lat) 
+      assert_equal(-109.447045, @track.bounds.max_lon)
+   end
+
+   def test_track_crop
+      area = GPX::Bounds.new( 
+         :min_lat =>   38.710000,
+         :min_lon => -109.600000,
+         :max_lat =>   38.791759,
+         :max_lon => -109.450000)
+      @track.crop(area)
+      assert_equal("ACTIVE LOG", @track.name)
+      assert_equal( 111, @track.points.size) 
+      assert_equal(4, @track.segments.size)
+      assert_equal("1.62136024923607", @track.distance.to_s) 
+      assert_equal(1557.954, @track.lowest_point.elevation)
+      assert_equal(1582.468, @track.highest_point.elevation)
+      assert_equal(38.782511, @track.bounds.min_lat) 
+      assert_equal(-109.599781, @track.bounds.min_lon) 
+      assert_equal(38.789527, @track.bounds.max_lat) 
+      assert_equal(-109.594996, @track.bounds.max_lon)
+   end
+
+   def test_track_delete
+      area = GPX::Bounds.new( 
+         :min_lat =>   38.710000,
+         :min_lon => -109.600000,
+         :max_lat =>   38.791759,
+         :max_lon => -109.450000)
+      @track.delete_area(area)
+
+      #puts @track
+      #assert_equal("ACTIVE LOG", @track.name)
+      #assert_equal( 111, @track.points.size) 
+      #assert_equal(4, @track.segments.size)
+      #assert_equal("1.62136024923607", @track.distance.to_s) 
+      #assert_equal(1557.954, @track.lowest_point.elevation)
+      #assert_equal(1582.468, @track.highest_point.elevation)
+      #assert_equal(38.782511, @track.bounds.min_lat) 
+      #assert_equal(-109.599781, @track.bounds.min_lon) 
+      #assert_equal(38.789527, @track.bounds.max_lat) 
+      #assert_equal(-109.594996, @track.bounds.max_lon)
+   end
+
+end