jpeg: added gps_lat/gps_lng methods for converting lat/lng to decimal…

…s. added gps method to return lat/lng in array. all accompanied by tests. added ruby env declaration to /bin/exifr

bin/exifr

@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+
 require 'exifr'
 include EXIFR
 

lib/jpeg.rb

@@ -48,7 +48,19 @@ def to_hash
       h.merge!(exif) if exif?
       h
     end
+
+    def gps
+      [self.gps_lat, self.gps_lng]
+    end
+
+    def gps_lat
+      self.gps_latitude[0].to_f+self.gps_latitude[1].to_f/60+self.gps_latitude[2].to_f/3600
+    end
 
+    def gps_lng
+      self.gps_longitude[0].to_f+self.gps_longitude[1].to_f/60+self.gps_longitude[2].to_f/3600
+    end  
+
     # Dispatch to EXIF.  When no EXIF data is available but the
     # +method+ does exist for EXIF data +nil+ will be returned.
     def method_missing(method, *args)

tests/jpeg_test.rb

@@ -65,10 +65,33 @@ def test_exif_dispatch
     assert j.respond_to?('date_time')
     assert_not_nil j.date_time
     assert_kind_of Time, j.date_time
-
     assert_not_nil j.f_number
     assert_kind_of Rational, j.f_number
   end
+
+  def test_geolocation
+    j = JPEG.new(f('iPhone-gps.jpg'))
+    assert j.methods.include?('gps_latitude')    
+    assert j.gps_latitude[0].to_f ==37.0
+    assert j.gps_latitude[1].to_f ==46.0
+    assert j.gps_latitude[2].to_f ==43.024
+
+    assert j.methods.include?('gps_longitude')
+    assert j.gps_longitude[0].to_f ==122.0
+    assert j.gps_longitude[1].to_f ==26.0
+    assert j.gps_longitude[2].to_f ==20.211
+
+    assert j.methods.include?('gps_lat')
+    assert j.methods.include?('gps_lng')
+    assert j.gps_lat.to_s == '37.7786177777778'
+    assert j.gps_lng.to_s == '122.4389475'
+
+    assert j.methods.include?('gps')
+    gps=j.gps
+    assert j.gps[0].to_s == '37.7786177777778'
+    assert j.gps[1].to_s == '122.4389475'
+
+  end
 
   def test_no_method_error
     assert_nothing_raised { JPEG.new(f('image.jpg')).f_number }