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[rails.git] / lib / geo_record.rb

diff --git a/lib/geo_record.rb b/lib/geo_record.rb
index 61185a314397b6661def0043dbc6f759a5d94c00..e02734ec909dc8064f78d2cf8e17455287939911 100644 (file)
--- a/lib/geo_record.rb
+++ b/lib/geo_record.rb
@@ -1,4 +1,19 @@
+require "delegate"
+
 module GeoRecord
+  # Ensure that when coordinates are printed that they are always in decimal degrees,
+  # and not e.g. 4.0e-05
+  # Unfortunately you can't extend Numeric classes directly (e.g. `Coord < Float`).
+  class Coord < DelegateClass(Float)
+    def initialize(obj)
+      super(obj)
+    end
+
+    def to_s
+      format("%.7f", self)
+    end
+  end
+
   # This scaling factor is used to convert between the float lat/lon that is
   # returned by the API, and the integer lat/lon equivalent that is stored in
   # the database.
@@ -14,6 +29,7 @@ module GeoRecord
   def in_world?
     return false if lat < -90 || lat > 90
     return false if lon < -180 || lon > 180
+
     true
   end
 
@@ -31,17 +47,11 @@ module GeoRecord
 
   # Return WGS84 latitude
   def lat
-    latitude.to_f / SCALE
+    Coord.new(latitude.to_f / SCALE)
   end
 
   # Return WGS84 longitude
   def lon
-    longitude.to_f / SCALE
-  end
-
-  private
-
-  def lat2y(a)
-    180 / Math::PI * Math.log(Math.tan(Math::PI / 4 + a * (Math::PI / 180) / 2))
+    Coord.new(longitude.to_f / SCALE)
   end
 end